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Prof. Dr. Chaohui Wang
School of Highway, Chang’an University

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Research Keywords & Expertise

0 Pavement and material engineering
0 Reuse of waste resources
0 Functional road materials
0 Durability improvement technology
0 Environmentally friendly road materials

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Journal article
Published: 10 August 2021 in Sustainability
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The purpose of this study is to further improve the road performance and emission reduction effect of tourmaline-modified asphalt. Graphene was used to enhance the performance of tourmaline-modified asphalt, and graphene/tourmaline-composite-modified asphalt was prepared. The temperature susceptibility, high temperature, anti-aging properties and rheological performance of the modified asphalt were studied. The test method of emission reduction efficiency of the modified asphalt and its mixture was proposed. The emission reduction effect of different modified asphalts and its mixture was evaluated. The enhancement effect of graphene on the properties of tourmaline-modified asphalt was confirmed. It provides a reference for the performance enhancement of inorganic material modified asphalt. The results show that the temperature susceptibility, high temperature, anti-aging properties and rheological performance of the graphene/tourmaline-composite-modified asphalt are better than those of the tourmaline-modified asphalt and base asphalt. The asphalt fume reduction rate of graphene/tourmaline-composite-modified asphalt is higher than that of tourmaline-modified asphalt. With the increase of graphene content, the emission reduction performance increases gradually, and the enhancement effect of graphene on tourmaline performance is more obvious.

ACS Style

Tengteng Guo; Hao Fu; Chaohui Wang; Haijun Chen; Qian Chen; Qing Wang; Yuanzhao Chen; Zhenxia Li; Aijiu Chen. Road Performance and Emission Reduction Effect of Graphene/Tourmaline-Composite-Modified Asphalt. Sustainability 2021, 13, 8932 .

AMA Style

Tengteng Guo, Hao Fu, Chaohui Wang, Haijun Chen, Qian Chen, Qing Wang, Yuanzhao Chen, Zhenxia Li, Aijiu Chen. Road Performance and Emission Reduction Effect of Graphene/Tourmaline-Composite-Modified Asphalt. Sustainability. 2021; 13 (16):8932.

Chicago/Turabian Style

Tengteng Guo; Hao Fu; Chaohui Wang; Haijun Chen; Qian Chen; Qing Wang; Yuanzhao Chen; Zhenxia Li; Aijiu Chen. 2021. "Road Performance and Emission Reduction Effect of Graphene/Tourmaline-Composite-Modified Asphalt." Sustainability 13, no. 16: 8932.

Journal article
Published: 03 July 2021 in Applied Energy
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This paper presents a design scheme for the applicability of piezoelectric power generation device in road traffic environment, which overcomes the problem of limited application due to the existing technology inapplicability to the complicated and changeable road traffic environment. Then, the traffic environment applicability of the device is evaluated with respect to the traffic load, temperature and water. And the electrical output effects are tested under different loads. The results indicate that under the load of 2.86 times the standard traffic load, the overall deformation of the device is only 0.941 mm, and the device exhibits good compression stability. The maximum internal temperature change rate of the device under different ambient temperatures is 2.4 °C/h, which is far lower than the pavement. Furthermore, the weight of the device increases by only 2.1 g after 24 h of immersion in water, with no moisture inside the device. Therefore, the device has excellent applicability in the traffic environment. Finally, the voltage and power of the device under the 0.9 MPa – 5 Hz can reach 96 V and 43.264 mW, and the power density reaches 0.064 mW/cm3, which is much higher than existing devices. This work will promote the application of piezoelectric energy harvesting technology in road engineering.

ACS Style

Chaohui Wang; Hongyun Cao; Shuai Wang; Zhiwei Gao. Design and testing of road piezoelectric power generation device based on traffic environment applicability. Applied Energy 2021, 299, 117344 .

AMA Style

Chaohui Wang, Hongyun Cao, Shuai Wang, Zhiwei Gao. Design and testing of road piezoelectric power generation device based on traffic environment applicability. Applied Energy. 2021; 299 ():117344.

Chicago/Turabian Style

Chaohui Wang; Hongyun Cao; Shuai Wang; Zhiwei Gao. 2021. "Design and testing of road piezoelectric power generation device based on traffic environment applicability." Applied Energy 299, no. : 117344.

Research article
Published: 08 June 2021 in Advances in Civil Engineering
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Dynamic modulus is a key evaluation index of the high-modulus asphalt mixture, but it is relatively difficult to test and collect its data. The purpose is to achieve the accurate prediction of the dynamic modulus of the high-modulus asphalt mixture and further optimize the design process of the high-modulus asphalt mixture. Five high-temperature performance indexes of high-modulus asphalt and its mixture were selected. The correlation between the above five indexes and the dynamic modulus of the high-modulus asphalt mixture was analyzed. On this basis, the dynamic modulus prediction models of the high-modulus asphalt mixture based on small sample data were established by multiple regression, general regression neural network (GRNN), and support vector machine (SVM) neural network. According to parameter adjustment and cross-validation, the output stability and accuracy of different prediction models were compared and evaluated. The most effective prediction model was recommended. The results show that the SVM model has more significant prediction accuracy and output stability than the multiple regression model and the GRNN model. Its prediction error was 0.98–9.71%. Compared with the other two models, the prediction error of the SVM model declined by 0.50–11.96% and 3.76–13.44%. The SVM neural network was recommended as the dynamic modulus prediction model of the high-modulus asphalt mixture.

ACS Style

Chaohui Wang; Songyuan Tan; Qian Chen; Jiguo Han; Liang Song; Yi Fu. Dynamic Modulus Prediction of a High-Modulus Asphalt Mixture. Advances in Civil Engineering 2021, 2021, 1 -10.

AMA Style

Chaohui Wang, Songyuan Tan, Qian Chen, Jiguo Han, Liang Song, Yi Fu. Dynamic Modulus Prediction of a High-Modulus Asphalt Mixture. Advances in Civil Engineering. 2021; 2021 ():1-10.

Chicago/Turabian Style

Chaohui Wang; Songyuan Tan; Qian Chen; Jiguo Han; Liang Song; Yi Fu. 2021. "Dynamic Modulus Prediction of a High-Modulus Asphalt Mixture." Advances in Civil Engineering 2021, no. : 1-10.

Research article
Published: 31 May 2021 in International Journal of Pavement Engineering
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To ensure the effective bonding of each structural layer of pavement and improve the service quality and durability of pavement, the waterborne epoxy resin (WER) emulsified asphalt (WEREA) tack coat binders were prepared by using polyurethane-epoxy resin. The basic properties of WEREA, such as tensile strength, adhesion to aggregate, high temperature heat resistance and low temperature impact resistance were studied. Its composition and ratio were optimised. The waterproof, bonding and durability performance of WEREA used in pavement tack coat were evaluated. The results show that WEREA prepared by polyether polyurethane modified E-51 epoxy resin (PUD-E51) has higher early and late strength. Its tensile strength was 1.75 MPa after curing for 7 days. The basic properties of WEREA, including adhesion to aggregate, heat resistance and impact resistance were better than those of SBS modified asphalt and crumb rubber modified asphalt binder. The tack coat of WEREA cannot seep under the dynamic water pressure of 0.6 MPa for 30 min. According to the interlaminar shear strength, the recommended spraying amount of the WEREA tack coat was 1.0 kg/m2. The WEREA could guarantee the effective bonding of each structural layer of the pavement, and improve the durability of the tack coat and pavement.

ACS Style

Hao Fu; Chaohui Wang; Liangliang Niu; Guolin Yang; Luqing Liu. Composition optimisation and performance evaluation of waterborne epoxy resin emulsified asphalt tack coat binder for pavement. International Journal of Pavement Engineering 2021, 1 -15.

AMA Style

Hao Fu, Chaohui Wang, Liangliang Niu, Guolin Yang, Luqing Liu. Composition optimisation and performance evaluation of waterborne epoxy resin emulsified asphalt tack coat binder for pavement. International Journal of Pavement Engineering. 2021; ():1-15.

Chicago/Turabian Style

Hao Fu; Chaohui Wang; Liangliang Niu; Guolin Yang; Luqing Liu. 2021. "Composition optimisation and performance evaluation of waterborne epoxy resin emulsified asphalt tack coat binder for pavement." International Journal of Pavement Engineering , no. : 1-15.

Journal article
Published: 21 May 2021 in Construction and Building Materials
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High modulus asphalt mixtures are increasingly being applied owing to their excellent high temperature performance and fatigue resistance. Currently, they are mainly prepared with admixtures. Aiming at problems of complex processes and poor performance-cost ratios of admixture, Ultra-high molecular weight polymer (UHMWP) was selected as basic material, and cross-linked UHMWP was prepared by a crosslinking reaction. The performances of the UHMWP modified asphalt and cross-linked UHMWP modified asphalt were then compared. UHMWP was determined as modifiers. Through dynamic shear rheometer (DSR) and bending beam rheometer (BBR), the influences of UHMWP content on the basic performance and rheological performance of asphalt were investigated, and their microscopic modification mechanisms were revealed by Scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The change laws of the dynamic modulus of the UHMWP high modulus mixture with temperature and frequency were clarified, and the change characteristics of their dynamic modulus master curves at different temperatures in different frequency ranges were analyzed. Subsequently, the performances of the different mixtures were evaluated. The results indicate that the performances of UHMWP modified asphalt were better than that of cross-linked UHMWP modified asphalt. As the UHMWP content increases, the high temperature performance of asphalt improves significantly. The rut factor of UHMWP-6 is 79.88% higher than that of UHMWP-4 at 70 ℃. On account of performance and cost, the recommended UHMWP content is 6%. The UHMWP is evenly bound by asphalt and has excellent compatibility. The content of UHMWP has a little effect on the phase change of asphalt. UHMWP mixtures have excellent mechanical performance, and their dynamic modulus reaches 21835 MPa at 15 ℃ and 10 Hz. As the temperature rises, the sensitivity of the dynamic modulus to frequency changes increases.

ACS Style

Chaohui Wang; Xiaolei Zhou; Huazhi Yuan; Haoyu Chen; Liwei Zhou; Yi Fu. Preparation and performance of UHMWP modified asphalt and its high modulus mixture. Construction and Building Materials 2021, 294, 123629 .

AMA Style

Chaohui Wang, Xiaolei Zhou, Huazhi Yuan, Haoyu Chen, Liwei Zhou, Yi Fu. Preparation and performance of UHMWP modified asphalt and its high modulus mixture. Construction and Building Materials. 2021; 294 ():123629.

Chicago/Turabian Style

Chaohui Wang; Xiaolei Zhou; Huazhi Yuan; Haoyu Chen; Liwei Zhou; Yi Fu. 2021. "Preparation and performance of UHMWP modified asphalt and its high modulus mixture." Construction and Building Materials 294, no. : 123629.

Journal article
Published: 19 April 2021 in Construction and Building Materials
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Microcracks are common in the cast-in-situ concrete pavement of the bridge deck, DDMS was selected as modifier, AD- I, AD- II and AD- III active diluents were used as viscosity reducers to effectively repair the cracks. And the preparation process of low-viscosity epoxy grouting materials modified by silicone was optimized. Then the working properties (viscosity, gelation time and groutability) and mechanical properties of silicone modified low-viscosity epoxy grouting materials were clarified. Finally, the evolution law of mechanical properties of low-viscosity epoxy grouting material modified by silicone under high temperature impact, temperature change cycle and freeze–thaw cycle was revealed. The results show that the physical and mechanical properties of grouting material prepared under the conditions of reaction temperature 100 °C, reaction time 3 h and DDMS content 11% were the best. The repair depth of low-viscosity epoxy grouting material modified with silicone in 0.5 mm wide crack exceeded 10 cm within 5 min at 25 °C. But its gel time was longer, up to 24 ~ 28 h. After curing for 3 days, the shear strength and bond strength of the silicone modified low-viscosity epoxy grouting material under room temperature reached more than 90%, and its high-temperature shear strength and bond strength reached 70%~90%. Compared with EP grouting material, the low-temperature and normal-temperature impact toughness of the grouting material after adding diluent and DDMS increased by 57%~71% and 31%~48%, respectively. After high-temperature impact, temperature change cycle and freeze–thaw cycle, the mechanical properties of silicone modified low-viscosity epoxy grouting material decreased slightly, but it was still stronger than EP grouting material. Its tensile strength was still higher than 30 MPa, elongation at break was higher than 5.0%, and bond strength was higher than 3.0 MPa.

ACS Style

Chaohui Wang; Zhentong Fan; Changhui Li; Haijiao Zhang; Xudang Xiao. Preparation and engineering properties of low-viscosity epoxy grouting materials modified with silicone for microcrack repair. Construction and Building Materials 2021, 290, 123270 .

AMA Style

Chaohui Wang, Zhentong Fan, Changhui Li, Haijiao Zhang, Xudang Xiao. Preparation and engineering properties of low-viscosity epoxy grouting materials modified with silicone for microcrack repair. Construction and Building Materials. 2021; 290 ():123270.

Chicago/Turabian Style

Chaohui Wang; Zhentong Fan; Changhui Li; Haijiao Zhang; Xudang Xiao. 2021. "Preparation and engineering properties of low-viscosity epoxy grouting materials modified with silicone for microcrack repair." Construction and Building Materials 290, no. : 123270.

Journal article
Published: 22 February 2021 in Construction and Building Materials
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Introducing the blast furnace slag (BFS) into grouting materials not only can improve its performances significantly but also can recycle the industrial by-product economically. The current researches related to BFS mainly focus on the preparation and evaluation of BFS-based paste (BFSBP). However, the grouting effects of hardened grout stone body with BFS-based mortar (BFSBM) are investigated rarely. In this study, a BFSBM material was developed based on BFS and its optimum mix ratio was determined. A new self-developed grouting simulation device was designed to study the grouting effects of hardened grout stone body based on different road grades and grouting diffusion radii. The results show that the optimum mix ratio of BFSBM determined as mSS/mBFS, mSH/mBFS, mW/mBFS, and mS/mBFS are 0.11, 0.09, 0.42 and 0.4, respectively (SS, SH, W, and S represent sodium silicate, solid sodium hydroxide, purified water, and sand, respectively). BFSBM has a good grouting effect on void road bases and the highest 7d compressive strength of the core sample taken from the expressway highway void base reaches 13.2 MPa. The 7d compressive strength of the core sample 60 cm away from the grouting hole is 63.2% higher than the compressive strength in the requirements.

ACS Style

Menghao Wang; Chaohui Wang; Jianxing Yu; Yanwei Li; Penghui Wen; Qiaojuan Fan. Investigation of the grouting effect of blast furnace slag-based mortar on void road bases based on the grouting simulation test. Construction and Building Materials 2021, 282, 122567 .

AMA Style

Menghao Wang, Chaohui Wang, Jianxing Yu, Yanwei Li, Penghui Wen, Qiaojuan Fan. Investigation of the grouting effect of blast furnace slag-based mortar on void road bases based on the grouting simulation test. Construction and Building Materials. 2021; 282 ():122567.

Chicago/Turabian Style

Menghao Wang; Chaohui Wang; Jianxing Yu; Yanwei Li; Penghui Wen; Qiaojuan Fan. 2021. "Investigation of the grouting effect of blast furnace slag-based mortar on void road bases based on the grouting simulation test." Construction and Building Materials 282, no. : 122567.

Research article
Published: 11 February 2021 in Advances in Civil Engineering
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This study aims to optimize the bonding performance between the wearing course and the used pavement or the underlying layer and further improve the service quality and durability of the open-graded friction course with small particle size aggregate (ultrathin OGFC). The ultrathin OGFC including waterborne epoxy resin emulsified asphalt (WEA) bonding layer and open-graded asphalt concrete with 9.5 mm nominal maximum aggregate size gradation was optimized. The construction timing of the open-graded asphalt mixture was determined. The road performance, wear resistance, and interlaminar bonding durability of the ultrathin OGFC were comprehensively evaluated. The results show that, based on the basic properties of the open-graded asphalt mixture, its asphalt aggregate ratio is recommended to be 5.0–5.5%. Based on interlaminar shear strength, it is recommended that the open-graded asphalt mixture is paved immediately after WEA bonding material was sprayed, and the bonding layer does not spread aggregate. The WEA containing 20% waterborne epoxy resin (WER) is recommended as bonding layer for the ultrathin OGFC, and the optimized spraying amount is 1 kg/m2. The ultrathin OGFC has good antisliding, drainage, and wear resistance properties. The interlaminar bonding performance, water stability, and durability of WEA bonding layer are obviously better than those of high viscosity asphalt (HVA) and SBS-modified asphalt. The WEA bonding layer can better resist interlaminar shear failure and improve the service quality and service life of the ultrathin OGFC.

ACS Style

Hao Fu; Chaohui Wang; GongXin Yu; Qian Chen; Luqing Liu. Design Optimization and Performance Evaluation of the Open-Graded Friction Course with Small Particle Size Aggregate. Advances in Civil Engineering 2021, 2021, 1 -11.

AMA Style

Hao Fu, Chaohui Wang, GongXin Yu, Qian Chen, Luqing Liu. Design Optimization and Performance Evaluation of the Open-Graded Friction Course with Small Particle Size Aggregate. Advances in Civil Engineering. 2021; 2021 ():1-11.

Chicago/Turabian Style

Hao Fu; Chaohui Wang; GongXin Yu; Qian Chen; Luqing Liu. 2021. "Design Optimization and Performance Evaluation of the Open-Graded Friction Course with Small Particle Size Aggregate." Advances in Civil Engineering 2021, no. : 1-11.

Journal article
Published: 10 February 2021 in Applied Energy
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This paper presents a road piezoelectric micro-energy collection-storage system, which overcomes the problem of limited application due to the existing technology being unsuitable for complex road traffic conditions and instantaneous, discontinuous, and uneven road piezoelectric micro-energy output characteristics. The reliability of energy collection-storage is verified, the effects and laws of energy collection-storage under different traffic conditions and on-site open-traffic conditions are systematically studied, and the on-site power-to-electricity conversion efficiency and energy collection-storage efficiency under open traffic conditions are evaluated. The results indicate that the electrical output and energy collection-storage of the system are reliable, and the 3300 μF-capacity system can be fully charged in 2–6 min. The energy collection-storage effect under different traffic conditions is significant, and the greater the driving load, the fewer vehicles the 4 F-capacity system needs to collect and store the same energy. After the test section is paved, under the condition of random driving traffic, heavy load rolling and the more continuous, stable traffic flow with rich axle load spectrum will help the energy collection. And the energy method presented shows 180% improvement in accuracy compared with the traditional maximum theory. Under open traffic conditions, the maximum on-site power-to-electricity conversion efficiency of the system is 26.8%, the energy collection-storage efficiency is 5.15%, and the maximum overall efficiency from vehicle rolling to energy storage is 0.74–1.38%. This work will provide a strategy for the technology to collect and store energy more accurately and efficiently.

ACS Style

Chaohui Wang; Shuai Wang; Zhiwei Gao; Zhi Song. Effect evaluation of road piezoelectric micro-energy collection-storage system based on laboratory and on-site tests. Applied Energy 2021, 287, 116581 .

AMA Style

Chaohui Wang, Shuai Wang, Zhiwei Gao, Zhi Song. Effect evaluation of road piezoelectric micro-energy collection-storage system based on laboratory and on-site tests. Applied Energy. 2021; 287 ():116581.

Chicago/Turabian Style

Chaohui Wang; Shuai Wang; Zhiwei Gao; Zhi Song. 2021. "Effect evaluation of road piezoelectric micro-energy collection-storage system based on laboratory and on-site tests." Applied Energy 287, no. : 116581.

Research article
Published: 14 December 2020 in International Journal of Pavement Engineering
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The purpose of the study is to clarify the curing effect of raw material composition on waterborne epoxy resin, thereby further improving working performance of waterborne epoxy resin. Based on the preferred variety of epoxy resins and curing agents, different types of waterborne epoxy resins were prepared. The effects of different raw material compositions on the physical properties of waterborne epoxy resin were studied systematically. The reasonable material composition and proportion were determined. The influence of physical properties of waterborne epoxy resin on its adhesion properties was evaluated. The results show that raw material composition has a large impact on the working performance of waterborne epoxy resin. The combination of E–44 waterborne epoxy resin and alicyclic amine has the best comprehensive property. And it is 3.65–36.22% higher than other combinations. The adhesive property index of waterborne epoxy resin has a high correlation with the mechanical property index, and they are in direct proportion.

ACS Style

Qian Chen; Youfu Lu; Chaohui Wang; Bing Han; Hao Fu. Effect of raw material composition on the working performance of waterborne epoxy resin for road. International Journal of Pavement Engineering 2020, 1 -12.

AMA Style

Qian Chen, Youfu Lu, Chaohui Wang, Bing Han, Hao Fu. Effect of raw material composition on the working performance of waterborne epoxy resin for road. International Journal of Pavement Engineering. 2020; ():1-12.

Chicago/Turabian Style

Qian Chen; Youfu Lu; Chaohui Wang; Bing Han; Hao Fu. 2020. "Effect of raw material composition on the working performance of waterborne epoxy resin for road." International Journal of Pavement Engineering , no. : 1-12.

Research article
Published: 02 December 2020 in Advances in Civil Engineering
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The extreme learning machine (ELM) algorithm optimized by genetic algorithm (GA) was used to quickly predict the low-temperature rheological properties of styrenic block copolymer (SBS) modified asphalt through the properties of the raw materials. In this work, one hundred groups of survey data and test data were collected and analyzed. Fourteen vital raw material parameters, such as chemical composition indexes of matrix asphalt and technical indexes of SBS modifier, were selected as the input parameter. The stiffness modulus and m-value of SBS modified asphalt were taken as the output parameter. Then, the GA-ELM prediction model of low-temperature rheological properties was established. According to comparison and analysis with other prediction models, the accuracy and output stability of the GA-ELM prediction model were verified. The results show that the GA-ELM model had obvious accuracy and efficiency. It can be used to predict the low-temperature rheological properties of SBS modified asphalt. Compared with the traditional prediction models, the error of the GA-ELM model was reduced by 68.97–81.48%.

ACS Style

Qian Chen; Chaohui Wang; Liang Song. Prediction of Low-Temperature Rheological Properties of SBS Modified Asphalt. Advances in Civil Engineering 2020, 2020, 1 -8.

AMA Style

Qian Chen, Chaohui Wang, Liang Song. Prediction of Low-Temperature Rheological Properties of SBS Modified Asphalt. Advances in Civil Engineering. 2020; 2020 ():1-8.

Chicago/Turabian Style

Qian Chen; Chaohui Wang; Liang Song. 2020. "Prediction of Low-Temperature Rheological Properties of SBS Modified Asphalt." Advances in Civil Engineering 2020, no. : 1-8.

Journal article
Published: 30 September 2020 in Construction and Building Materials
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The purpose is to realize the environmental friendliness and sustainability of pavement active deicing and snow melting. Different types of SBS modified asphalt conductive bonding materials for pavement interlayer bonding and melting ice and snow were prepared. The effects of conductive phase materials, electrodes and spacing on the conductivity and heat generation of conductive bonding layer were studied. The heating effect of SBS modified asphalt conductive bonding layer in pavement structure was analyzed. The feasibility of converting electric energy into heat energy by conductive bonding layer to realize melting ice and snow on pavement was verified. It provides a new direction for the research and application of green active deicing and snow melting. The results show that the carbon fiber conductive bonding layer had the best conductivity. At the constant temperature of −5 °C, the surface temperature of the pavement structure could reach above 0 °C after the conductive bonding layer was electrified for 100 min under 36 V voltage, which can realize the deicing and snow melting of the pavement. The distribution of carbon fiber has a certain adverse effect on the bonding performance of conductive bonding layers, but it still shows good bonding performance, water resistance and temperature change resistance.

ACS Style

Chaohui Wang; Hao Fu; Wanbin Ma; Zhifang Zhang; Xiaoping Ji; Xiaoxia Han. Combination design and performance evaluation of conductive bonding layer for asphalt pavement active deicing. Construction and Building Materials 2020, 263, 121037 .

AMA Style

Chaohui Wang, Hao Fu, Wanbin Ma, Zhifang Zhang, Xiaoping Ji, Xiaoxia Han. Combination design and performance evaluation of conductive bonding layer for asphalt pavement active deicing. Construction and Building Materials. 2020; 263 ():121037.

Chicago/Turabian Style

Chaohui Wang; Hao Fu; Wanbin Ma; Zhifang Zhang; Xiaoping Ji; Xiaoxia Han. 2020. "Combination design and performance evaluation of conductive bonding layer for asphalt pavement active deicing." Construction and Building Materials 263, no. : 121037.

Journal article
Published: 03 September 2020 in Sensors and Actuators A: Physical
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The structure of piezoelectric energy harvester device has a significant impact on electromechanical conversion performance, and appropriate structural parameters are the important premise to ensure electromechanical conversion efficiency. In order to design the detailed structures which are more conducive to the electromechanical conversion in the d33 mode, and optimize or enhance the mechanical response of the piezoelectric energy harvesting unit, a finite element model was established to comprehensively analyze the influence of the detailed structures on the electromechanical response of the energy harvesting unit, based on the results, optimal detailed structural parameters are determined, and lateral mechanical environment of the energy harvesting unit is optimized. Finally, the stacked piezoelectric energy harvester device for road is made, and the rationality of optimization is verified by the MTS indoor comparative test. The results show that the protective pad with a fillet size of 3 mm, a thickness of 3 mm and an elastic modulus of 8000∼15000 MPa can effectively avoid edge stress concentration and obtain maximum top compressive stress for the energy harvesting unit, and also ensure durability and electrical output. Compared with the baseplate, the influence of the upper cover plate on electrical output is more significant, and the elastic modulus of the upper cover plate should be less than 2000 MPa, the thickness should be controlled within 8∼10 mm. The potential difference generated by the energy harvesting unit in lateral constraint environment is 40 % lower than that in no lateral constraint. Under load of 0.7 MPa-10 Hz, the terminal voltage of the optimization group is 2.2 times that of the control group, the average output power is 4.9 times, and the power density is 2.7 times, which shows the optimization rationality of detailed structures.

ACS Style

Chaohui Wang; GongXin Yu; Hongyun Cao; Shuai Wang; Yanwei Li. Structure simulation optimization and test verification of piezoelectric energy harvester device for road. Sensors and Actuators A: Physical 2020, 315, 112322 .

AMA Style

Chaohui Wang, GongXin Yu, Hongyun Cao, Shuai Wang, Yanwei Li. Structure simulation optimization and test verification of piezoelectric energy harvester device for road. Sensors and Actuators A: Physical. 2020; 315 ():112322.

Chicago/Turabian Style

Chaohui Wang; GongXin Yu; Hongyun Cao; Shuai Wang; Yanwei Li. 2020. "Structure simulation optimization and test verification of piezoelectric energy harvester device for road." Sensors and Actuators A: Physical 315, no. : 112322.

Journal article
Published: 29 August 2020 in Construction and Building Materials
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The thermal effect of asphalt pavements on the surrounding environment in summer is of increasing concern since they absorb a great deal of heat from solar radiation and contribute greatly to the urban heat island effect. A novel thermochromic material modified asphalt binder is proposed to modulate pavement temperature by reversibly changing colors and reflectivity to solar radiation in response to temperature variations. In this study, an attempt is extended into the mixture scale. The cooling effect and pavement performance of thermochromic material modified asphalt mixtures are evaluated using a proposed solar radiation simulation test and various mechanical tests. The thermochromic material modification mechanism is revealed from the physical and chemical points of view. It is found that the addition of thermochromic additive to base binders has a significant cooling effect on asphalt pavements in summer. The maximum temperature reduction is observed at the bottom of the top asphalt layer and the top of the middle asphalt layer. Two types of thermochromic additives show positive and negative effects on rutting resistance. Thermochromic material modification has little effect on low-temperature cracking resistance and all thermochromic material modified mixtures exhibit good moisture stability. Preliminary recommendations on the optimum additive type and content of thermochromic material are proposed. The characteristics of coating, dispersion, and intactness of thermochromic additives in base binders significantly affect the pavement performance of asphalt mixtures. The particle size of the thermochromic additive and the chemical composition of shell material are critical to binder modification.

ACS Style

Qiang Li; Tingyu Hu; Sang Luo; Lei Gao; Chaohui Wang; Yongsheng Guan. Evaluation of cooling effect and pavement performance for thermochromic material modified asphalt mixtures under solar radiation. Construction and Building Materials 2020, 261, 120589 .

AMA Style

Qiang Li, Tingyu Hu, Sang Luo, Lei Gao, Chaohui Wang, Yongsheng Guan. Evaluation of cooling effect and pavement performance for thermochromic material modified asphalt mixtures under solar radiation. Construction and Building Materials. 2020; 261 ():120589.

Chicago/Turabian Style

Qiang Li; Tingyu Hu; Sang Luo; Lei Gao; Chaohui Wang; Yongsheng Guan. 2020. "Evaluation of cooling effect and pavement performance for thermochromic material modified asphalt mixtures under solar radiation." Construction and Building Materials 261, no. : 120589.

Journal article
Published: 20 July 2020 in Applied Energy
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This paper presents a batch-processable cantilever piezoelectric device suitable for road traffic conditions, and the power it converts can provide a real-time safety warning for automobiles in hazardous areas. Based on road traffic characteristics, environment characteristics and construction convenience, a multilayer vertical butterfly array piezoelectric device with high sensitivity is designed. Furthermore, to verify the reliability of the device for the early warning in the laboratory stage, the power generation rules under different traffic conditions are studied systematically, and the applicable situations in different combinations of automobile types and speeds are clarified. Finally, the effects of instantaneous safety warning are verified, and the installation measure of device is determined. The results indicate that the power effect of the device first increases and then decreases with the increase in the speed (Corresponding to the vibration frequency generated by the axles of automobile). The power effect of a single device is optimal when simulating a light traffic conventional speed of 50–90 km/h (7–11 Hz), the maximum electrical output is 26 V-22.09 mW; while the power under heavy traffic is relatively poor, which is 20.8 V-7.84 mW. Moreover, the flashing effect of warning sign powered by a single device is better under the speeds, and the devices will be installed in front of the hidden section in piece-by-piece. The clean electric energy converted by the piezoelectric device will be helpful for real-time road safety early warning, reduce power loss for long-distance transmission of power grids, and promote the process of intelligent transportation applications.

ACS Style

Shuai Wang; Chaohui Wang; Zhiwei Gao; Hongyun Cao. Design and performance of a cantilever piezoelectric power generation device for real-time road safety warnings. Applied Energy 2020, 276, 115512 .

AMA Style

Shuai Wang, Chaohui Wang, Zhiwei Gao, Hongyun Cao. Design and performance of a cantilever piezoelectric power generation device for real-time road safety warnings. Applied Energy. 2020; 276 ():115512.

Chicago/Turabian Style

Shuai Wang; Chaohui Wang; Zhiwei Gao; Hongyun Cao. 2020. "Design and performance of a cantilever piezoelectric power generation device for real-time road safety warnings." Applied Energy 276, no. : 115512.

Journal article
Published: 20 April 2020 in Construction and Building Materials
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The resource utilization of solid waste in civil engineering is an essential direction of environmental governance. This study systematically investigated the feasibility of mineral waste slag as subgrade filler. The optimal compaction parameters of the waste slag were determined. The effects of different factors on the particle size distribution and mechanical properties of mineral waste slag were evaluated, and the construction parameters of the waste slag were recommended. The results show that when the coarse grain content (CGC) increases from 20% to 80%, the optimal moisture content of the mineral waste slag reduces from 13.03% to 10.50%. The CGC and compactive effort have a greater effect on the particle size distribution and mechanical properties of waste slag. The unconfined compressive strength of the sample reaches a maximum of 0.687 MPa when CGC is 50%. The recommended CGC of waste slag is about 50% in practical engineering, and the moisture content should be strictly controlled.

ACS Style

Ming Chen; Penghui Wen; Chaohui Wang; Zhi Chai; Zhiwei Gao. Evaluation of particle size distribution and mechanical properties of mineral waste slag as filling material. Construction and Building Materials 2020, 253, 119183 .

AMA Style

Ming Chen, Penghui Wen, Chaohui Wang, Zhi Chai, Zhiwei Gao. Evaluation of particle size distribution and mechanical properties of mineral waste slag as filling material. Construction and Building Materials. 2020; 253 ():119183.

Chicago/Turabian Style

Ming Chen; Penghui Wen; Chaohui Wang; Zhi Chai; Zhiwei Gao. 2020. "Evaluation of particle size distribution and mechanical properties of mineral waste slag as filling material." Construction and Building Materials 253, no. : 119183.

Journal article
Published: 19 April 2020 in Construction and Building Materials
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To improve the efficiency of deicing and snow melting on road surfaces, three types of pavement conductive bonding layers with heat insulation effects were prepared, and the conductive bonding layer snowmelt pavement structure with heat insulation effect was designed. The temperature increasing effect of the upper part and the cooling effect of the lower part of the insulating conductive bonding layer were studied under different electrifying times. The effects of different material compositions on the heat insulating effect of the conductive bonding layer for the road were analyzed, and the best heat insulating and conductive bonding layer was selected. Results indicate that the comprehensive performance of the modified waterborne epoxy resin conductive bonding layer is the best. Compared with the two other types of conductive bonding layers, the temperature increasing effect of the upper part of the modified waterborne epoxy resin conductive bonding layer is 21.11–127.78% higher, and the cooling effect of the lower part is 19.78–93.62% higher. The addition of a heat insulation filler effectively improves the effect of the heat insulation conductive bonding layer, and with the increase in carbon fiber spreading amount, the performance improvement range of the road heat insulating conductive bonding layer increases gradually. The use of 80 g/m2 of modified waterborne epoxy resin/hollow glass bead as the conductive bonding layer is recommended.

ACS Style

Chaohui Wang; Luqing Liu; Huazhi Yuan; Sang Luo; Xiaoxia Han. Fabrication and heat conduction performance investigation of a heat insulation conductive bonding layer for asphalt pavements. Construction and Building Materials 2020, 253, 119191 .

AMA Style

Chaohui Wang, Luqing Liu, Huazhi Yuan, Sang Luo, Xiaoxia Han. Fabrication and heat conduction performance investigation of a heat insulation conductive bonding layer for asphalt pavements. Construction and Building Materials. 2020; 253 ():119191.

Chicago/Turabian Style

Chaohui Wang; Luqing Liu; Huazhi Yuan; Sang Luo; Xiaoxia Han. 2020. "Fabrication and heat conduction performance investigation of a heat insulation conductive bonding layer for asphalt pavements." Construction and Building Materials 253, no. : 119191.

Journal article
Published: 07 April 2020 in Construction and Building Materials
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The purpose is to solve the problems of inadequate snow melting uniformity, difficult construction, and large heat storage in existing energy conversion pavements for deicing and snow melting. The conductive layers of different adhesive materials were prepared with emulsified asphalt modified by waterborne epoxy resin (MEAWER) and modified waterborne epoxy resin (MWER) as matrix. According to the surface resistivity and temperature change, the conductivities and heat conduction effects of the two types of conductive adhesive layers were compared and evaluated, respectively, and the road performance is determined based on multiple conditions. The results showed that when the amount of carbon fiber was 120 g/m2, compared to MEAWER, the surface resistivity of MWER was 18.7% lower, the surface temperature was 3.6 ℃ higher, and the bonding strength was 46.1% higher. The thermogenesis and heat dissipation efficiency of MWER could reach 6.9 and 2.76 ℃/h at −5 ℃, respectively. Moreover, its minimum shear and drawing strengths exceeded 1.3 and 0.5 MPa, respectively. Based on the temperature change and road performance of the conductive adhesive layer, it was recommended that 120 and 100 g/m2 of carbon fiber be distributed in the MEAWER and MWER conductive tack coats, respectively.

ACS Style

Chaohui Wang; Zhentong Fan; Cheng Shu; Xiaoxia Han. Preparation and performance of conductive tack coat on asphalt pavement. Construction and Building Materials 2020, 251, 118949 .

AMA Style

Chaohui Wang, Zhentong Fan, Cheng Shu, Xiaoxia Han. Preparation and performance of conductive tack coat on asphalt pavement. Construction and Building Materials. 2020; 251 ():118949.

Chicago/Turabian Style

Chaohui Wang; Zhentong Fan; Cheng Shu; Xiaoxia Han. 2020. "Preparation and performance of conductive tack coat on asphalt pavement." Construction and Building Materials 251, no. : 118949.

Journal article
Published: 27 March 2020 in Journal of Cleaner Production
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Through releasing negative ions and infrared radiation, tourmaline can absorb dust and hazardous substances to purify air. The purpose is to improve the air purification efficiency of tourmaline through the remarkable electrical properties of graphene. The efficient preparation method of graphene/tourmaline composite was proposed. The environmental properties of the graphene/tourmaline composites, such as infrared radiation and negative ion release, were systematically analyzed. The Hall effect was used to reveal the enhancement mechanism of graphene on tourmaline. This laid a solid foundation for the application of composites in the air purification fields. The results demonstrated that graphene could significantly enhance the environmental effect of tourmaline. The ball milling method was the optimum preparation method, and the parameters were determined as follows: ball milling speed = 200 rpm and ball milling time = 2 h. The optimum graphene content was 0.5% of the mass of tourmaline. The negative-ion release performance of graphene/tourmaline composites was higher than that of tourmaline by over 11.9%. The infrared emissivity and negative-ion release of graphene/tourmaline composites were observed to be significantly correlated with the band gap. The main reason for the enhancement in the environmental properties of tourmaline by graphene was that the band gap of tourmaline was reduced when graphene was compounded with tourmaline.

ACS Style

Chaohui Wang; Qian Chen; Tengteng Guo; Qiang Li. Environmental effects and enhancement mechanism of graphene/tourmaline composites. Journal of Cleaner Production 2020, 262, 121313 .

AMA Style

Chaohui Wang, Qian Chen, Tengteng Guo, Qiang Li. Environmental effects and enhancement mechanism of graphene/tourmaline composites. Journal of Cleaner Production. 2020; 262 ():121313.

Chicago/Turabian Style

Chaohui Wang; Qian Chen; Tengteng Guo; Qiang Li. 2020. "Environmental effects and enhancement mechanism of graphene/tourmaline composites." Journal of Cleaner Production 262, no. : 121313.

Journal article
Published: 07 February 2020 in Energy Conversion and Management
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This paper presents a multi-layer cantilever piezoelectric energy conversion structure for pavement, which avoids weakening the electrical output after the mass contact and realizes the coordinated vibration of each cantilever piezoelectric energy harvester and road driving. In order to ensure the structure meets the requirements of power generation and durability when applied in road engineering, based on the power generation theory of energy harvester, the structural parameters related to the electrical output magnitude are clarified. Based on the power generation performance and durability of energy conversion structure under typical road traffic characteristics, the optimal cantilever position and vibration amplitude are determined, which lay the foundation for the development and application of energy harvester in road field. The results indicate that the improved structure has the best power generation performance and durability with the condition of the distance from the piezoelectric material to the fixed end of 7 mm and the vibration amplitude of 4 mm under under typical road traffic conditions. The output voltage of the monolithic energy harvester at 5 Hz vibration frequency is 5.2 V, the output power can reach 3.14 mW, and the power density is 0.0063 mW/mm3. This power level and power density are significantly higher than other mechanisms. The structure will make it possible to co-vibrate with the driving, and the structural parameters avoid the misunderstandings of traditional designs that only the power generation performance is valued and the durability can be ignored, which make the structure can be used for collecting electric energy in pavement.

ACS Style

Shuai Wang; Chaohui Wang; GongXin Yu; Zhiwei Gao. Development and performance of a piezoelectric energy conversion structure applied in pavement. Energy Conversion and Management 2020, 207, 112571 .

AMA Style

Shuai Wang, Chaohui Wang, GongXin Yu, Zhiwei Gao. Development and performance of a piezoelectric energy conversion structure applied in pavement. Energy Conversion and Management. 2020; 207 ():112571.

Chicago/Turabian Style

Shuai Wang; Chaohui Wang; GongXin Yu; Zhiwei Gao. 2020. "Development and performance of a piezoelectric energy conversion structure applied in pavement." Energy Conversion and Management 207, no. : 112571.