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Zhi Suo
Beijing Collaborative Innovation Center for Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development, Beijing 100044, China

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Review
Published: 20 August 2021 in Molecules
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Transforming waste biomass materials into bio-oils in order to partially substitute petroleum asphalt can reduce environmental pollution and fossil energy consumption and has economic benefits. The characteristics of bio-oils and their utilization as additives of asphalts are the focus of this review. First, physicochemical properties of various bio-oils are characterized. Then, conventional, rheological, and chemical properties of bio-oil modified asphalt binders are synthetically reviewed, as well as road performance of bio-oil modified asphalt mixtures. Finally, performance optimization is discussed for bio-asphalt binders and mixtures. This review indicates that bio-oils are highly complex materials that contain various compounds. Moreover, bio-oils are source-depending materials for which its properties vary with different sources. Most bio-oils have a favorable stimulus upon the low temperature performance of asphalt binders and mixtures but exhibit a negative impact on their high-temperature performance. Moreover, a large amount of oxygen element, oxygen-comprising functional groups, and light components in plant-based bio-oils result in higher sensitivity to ageing of bio-oil modified asphalts. In order to increase the performance of bio-asphalts, most research has been limited to adding additive agents to bio-asphalts; therefore, more reasonable optimization methods need to be proposed. Furthermore, upcoming exploration is also needed to identify reasonable evaluation indicators of bio-oils, modification mechanisms of bio-asphalts, and long-term performance tracking in field applications of bio-asphalts during pavement service life.

ACS Style

Ran Zhang; Zhanping You; Jie Ji; Qingwen Shi; Zhi Suo. A Review of Characteristics of Bio-Oils and Their Utilization as Additives of Asphalts. Molecules 2021, 26, 5049 .

AMA Style

Ran Zhang, Zhanping You, Jie Ji, Qingwen Shi, Zhi Suo. A Review of Characteristics of Bio-Oils and Their Utilization as Additives of Asphalts. Molecules. 2021; 26 (16):5049.

Chicago/Turabian Style

Ran Zhang; Zhanping You; Jie Ji; Qingwen Shi; Zhi Suo. 2021. "A Review of Characteristics of Bio-Oils and Their Utilization as Additives of Asphalts." Molecules 26, no. 16: 5049.

Research article
Published: 14 July 2021 in Transportation Research Record: Journal of the Transportation Research Board
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Rail surface defects have negative impacts on riding comfort and track safety, and could even lead to accidents. Based on the safety database (2020) of the Federal Railroad Administration (FRA), rail surface defects have been among the main factors causing derailments. During the past decades, there have been many efforts to detect such rail surface defects. However, the applications of earlier methods are limited by the high requirements of specialized equipment and personnel training. To date, rail surface defect inspection is still a very labor-intensive and time-consuming process, which hardly satisfies the field maintenance expectations. Therefore, a cost-effective and user-friendly automatic system that can inspect the rail surface defects with high accuracy is urgently needed. To address this issue, this study proposes a computer vision-based instance segmentation framework for rail surface defect inspection. A rail surface database including 1,040 images (260 source images and 780 augmented images) has been built. The classic instance segmentation model, Mask R-CNN, has been re-trained and fine-tuned for inspecting rail surface defects with the customized dataset. The influences of different backbones and learning rates are investigated and discussed. Experimental results indicate the ResNet101 backbone reaches better inspection capability. With a learning rate of 0.005, the re-trained Mask R-CNN model can achieve the best performance on the bounding box and mask predictions. Sixteen images are used to test the inspection performance of the fine-tuned model. The results are promising and indicate potential field applications in the future.

ACS Style

Feng Guo; Yu Qian; Dimitris Rizos; Zhi Suo; Xiaobin Chen. Automatic Rail Surface Defects Inspection Based on Mask R-CNN. Transportation Research Record: Journal of the Transportation Research Board 2021, 1 .

AMA Style

Feng Guo, Yu Qian, Dimitris Rizos, Zhi Suo, Xiaobin Chen. Automatic Rail Surface Defects Inspection Based on Mask R-CNN. Transportation Research Record: Journal of the Transportation Research Board. 2021; ():1.

Chicago/Turabian Style

Feng Guo; Yu Qian; Dimitris Rizos; Zhi Suo; Xiaobin Chen. 2021. "Automatic Rail Surface Defects Inspection Based on Mask R-CNN." Transportation Research Record: Journal of the Transportation Research Board , no. : 1.

Journal article
Published: 16 June 2021 in Construction and Building Materials
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In recent years, the evaluation of aging behavior of different types of asphalt mixture has become an important research field in pavement engineering. The short-term and long-term aging properties of reclaimed asphalt concrete (RAC) under the effects of vegetable/mineral oil rejuvenators are introduced in this research. Eighteen specimens of reclaimed asphalt binders classified by rejuvenator contents and types were evaluated. The viscosity of aged/unaged reclaimed asphalt binder was measured at different temperature. The results proved that the type and content of rejuvenators have significant impacts on the viscosity values of the reclaimed asphalt binder. The reclaimed asphalt binders with vegetable oil rejuvenators have lower viscosity, which also demonstrated a less increase than that with a conventional mineral rejuvenator. Less weight loss, lower complex modulus G* and lower increase rates were also found in the reclaimed binders with vegetable oil rejuvenators than that with mineral oil rejuvenators. Less weight loss, lower complex modulus G*, and lower increase rates were also found in the reclaimed binders with vegetable oil rejuvenators than that with mineral oil rejuvenators. With various RAC were determined by the Marshall design method, the results of indirect tensile strength test (ITST) displayed that the aging procedure increased the ITS of RAC. Furthermore, the results of resilient modulus test, indicated that aging did not significantly increase the resilient modulus for RAC with vegetable oil rejuvenators.

ACS Style

Zhi Suo; Qiang Yan; Jie Ji; Xiaoyu Liu; Huan Chen; Ao Zhang. The aging behavior of reclaimed asphalt mixture with vegetable oil rejuvenators. Construction and Building Materials 2021, 299, 123811 .

AMA Style

Zhi Suo, Qiang Yan, Jie Ji, Xiaoyu Liu, Huan Chen, Ao Zhang. The aging behavior of reclaimed asphalt mixture with vegetable oil rejuvenators. Construction and Building Materials. 2021; 299 ():123811.

Chicago/Turabian Style

Zhi Suo; Qiang Yan; Jie Ji; Xiaoyu Liu; Huan Chen; Ao Zhang. 2021. "The aging behavior of reclaimed asphalt mixture with vegetable oil rejuvenators." Construction and Building Materials 299, no. : 123811.

Original research article
Published: 15 March 2021 in Frontiers in Materials
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Generally, the conventional rejuvenator contains many mineral oils to supply the missing components of aged bitumen. The mineral oils could recover the performance of aged bitumen go through a long-term aging process. However, the mineral oils are easy to volatilize at higher recycling temperature. The higher volatilization will reduce the effect of rejuvenator and limit proportion of reclaimed asphalt pavement (RAP) in recycled asphalt mixture (RAP contents less than 30%). The main components of vegetable oil are straight chain higher fatty acids and glycerides. The esters of straight chain higher fatty acids and glycerol are not volatile at high temperature. Therefore, they can be used to recover the micro chemical composition of bitumen and a change in colloidal stability of asphaltene. In this research, two newly kinds of bitumen rejuvenator were developed by replacing mineral oil with waste cooking corn and soybean oil. The two kinds of vegetable and a mineral bitumen rejuvenators were utilized to recover aged bitumen with 2–10% by weigh. The objectives of the research are evaluating the rheological properties, high temperature and fatigue performance of the recovered bitumen. The Dynamic Shear Rheometer Test and Rotational Viscosity Test were conducted according to the AASHTO and ASTM standards. Additionally, the crack resistance of bitumen was evaluated by using the bending beam rheometer (BBR) test at −12 and −18°C. The result of laboratory test and statistical analysis of ANOVA showed that the vegetable oil rejuvenators effectively reduce the viscosity and stiffness of aged bitumen. It will improve both the fatigue resistance and low temperature crack resistance. In addition, when the content of vegetable oil is higher, the rejuvenating agent can make the recovered bitumen have lower viscosity and stiffness. Considering that the rutting resistance under high temperature, it is suggested that 6 and 8% vegetable oil be used to recover the aged bitumen.

ACS Style

Zhi Suo; Huan Chen; Qiang Yan; Yitian Tan; Xinghai Li; Ao Zhang. Laboratory Performance Evaluation on the Recovering of Aged Bitumen With Vegetable Oil Rejuvenator. Frontiers in Materials 2021, 8, 1 .

AMA Style

Zhi Suo, Huan Chen, Qiang Yan, Yitian Tan, Xinghai Li, Ao Zhang. Laboratory Performance Evaluation on the Recovering of Aged Bitumen With Vegetable Oil Rejuvenator. Frontiers in Materials. 2021; 8 ():1.

Chicago/Turabian Style

Zhi Suo; Huan Chen; Qiang Yan; Yitian Tan; Xinghai Li; Ao Zhang. 2021. "Laboratory Performance Evaluation on the Recovering of Aged Bitumen With Vegetable Oil Rejuvenator." Frontiers in Materials 8, no. : 1.

Journal article
Published: 22 May 2020 in Construction and Building Materials
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This research aims to investigate the rutting resistance of Direct Coal Liquefaction Residue (DCLR) modified asphalt mixture under variable loads over a wide temperature range. The SK-90 asphalt mixture and Styrene-Butadiene-Styrene (SBS) modified asphalt mixture were selected as comparisons. The rutting resistance of these three mixtures was studied by the rutting test with temperature of 30–70 °C under variable loads of 0.7–1.0 MPa. Meanwhile, the double factor variance analysis was performed to study the effect of temperature and load on the rutting resistance of mixtures, and the radar analysis was applied for comprehensive evaluation on the rutting resistance as well. The results demonstrate that the rutting resistance of mixtures presents a negative linear correlation with the load or the temperature. Comparing load, the temperature shows a more significant influence on the resistance to rutting of mixtures. Under the coupling effect of temperature and load, the DCLR modified asphalt mixture had higher values of Va, Vb, WL and WT than the other two mixtures. Therefore, among these three mixtures, the DCLR modified asphalt mixture owns the best stable rutting resistance, which gives the least sensitivity and dependence on the temperature and load.

ACS Style

Ji Jie; Wang Zhe; Zhang Ran; Wei Jianming; Suo Zhi; You Zhanping; Hu Junpeng. Rutting resistance of direct coal liquefaction residue (DCLR) modified asphalt mixture under variable loads over a wide temperature range. Construction and Building Materials 2020, 257, 119489 .

AMA Style

Ji Jie, Wang Zhe, Zhang Ran, Wei Jianming, Suo Zhi, You Zhanping, Hu Junpeng. Rutting resistance of direct coal liquefaction residue (DCLR) modified asphalt mixture under variable loads over a wide temperature range. Construction and Building Materials. 2020; 257 ():119489.

Chicago/Turabian Style

Ji Jie; Wang Zhe; Zhang Ran; Wei Jianming; Suo Zhi; You Zhanping; Hu Junpeng. 2020. "Rutting resistance of direct coal liquefaction residue (DCLR) modified asphalt mixture under variable loads over a wide temperature range." Construction and Building Materials 257, no. : 119489.

Journal article
Published: 15 November 2018 in Journal of Testing and Evaluation
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The objective of this research is to study the properties of waterborne epoxy–modified emulsified asphalt binder (WEMEAB). The WEMEAB was prepared with a method of preemulsification and modification. The optimum asphalt-water ratio (ratio of base asphalt binder to emulsifier), emulsifier content, and waterborne epoxy content were determined through an orthogonal test with three factors and three levels. Based on the penetration system, the high- and low-temperature properties and storage stability of WEMEAB were evaluated. The distribution of waterborne epoxy in the modified emulsified asphalt binder and the microstructure of WEMEAB were observed through the Fluorescence Optical Microscopy (FOM) and Atomic Force Microscopy (AFM) tests. The test results indicated that the high- and low-temperature properties of WEMEAB were noticeably improved and that the waterborne epoxy was distributed uniformly in the modified emulsified asphalt binder with an asphalt-water ratio of 65:35, 4 % waterborne epoxy and 1.4 % emulsifier. The FOM and AFM images showed that cross-linking and interpenetration network structure and “bee-like” structures had formed on the surface of the WEMEAB.

ACS Style

Jie Ji; Hui Yao; Wenhua Zheng; Zhi Suo; Ying Xu; Song Han; Shifa Xu; Zhanping You. Preparation and Properties of Waterborne Epoxy–Modified Emulsified Asphalt Binder (WEMEAB). Journal of Testing and Evaluation 2018, 48, 1 .

AMA Style

Jie Ji, Hui Yao, Wenhua Zheng, Zhi Suo, Ying Xu, Song Han, Shifa Xu, Zhanping You. Preparation and Properties of Waterborne Epoxy–Modified Emulsified Asphalt Binder (WEMEAB). Journal of Testing and Evaluation. 2018; 48 (4):1.

Chicago/Turabian Style

Jie Ji; Hui Yao; Wenhua Zheng; Zhi Suo; Ying Xu; Song Han; Shifa Xu; Zhanping You. 2018. "Preparation and Properties of Waterborne Epoxy–Modified Emulsified Asphalt Binder (WEMEAB)." Journal of Testing and Evaluation 48, no. 4: 1.

Research article
Published: 04 June 2018 in Advances in Materials Science and Engineering
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This study evaluated the effects of coarse aggregate angularity (CAA) on the performances of warm mix asphalt (WMA) because previous studies have predominantly focused on the effects of CAA on the hot mix asphalt (HMA) performances. Five different CAAs were fabricated using Los Angeles abrasion test, and the digital image processing method was used to identify the CAA. Five mixes with different combinations of CAA and Sasobit-modified asphalt binder were prepared according to the Marshall mix design procedure. The performances such as the resistance to rutting and thermal cracking, moisture susceptibility, and volumetric characteristics of WMA were evaluated. The test results indicated that the CAA value was linearly declined with the abrasive wearing passes increased. Higher CAA value improved the potential to resistance to rutting of WMA but was not suitable to enhance the resistance to thermal cracking of WMA due to sharp corners that caused higher stress concentration. In addition, WMA was more prone to develop numerous macrocracking, which resulted in lower moisture susceptibility due to higher CAA value inducing higher air void, VMA, and VCA of WMA.

ACS Style

Jie Ji; Peng Zhai; Wenhua Zheng; Zhi Suo; Ying Xu. A Laboratory Investigation into the Effects of Coarse Aggregate Angularity on Performance of WMA. Advances in Materials Science and Engineering 2018, 2018, 1 -11.

AMA Style

Jie Ji, Peng Zhai, Wenhua Zheng, Zhi Suo, Ying Xu. A Laboratory Investigation into the Effects of Coarse Aggregate Angularity on Performance of WMA. Advances in Materials Science and Engineering. 2018; 2018 ():1-11.

Chicago/Turabian Style

Jie Ji; Peng Zhai; Wenhua Zheng; Zhi Suo; Ying Xu. 2018. "A Laboratory Investigation into the Effects of Coarse Aggregate Angularity on Performance of WMA." Advances in Materials Science and Engineering 2018, no. : 1-11.

Conference paper
Published: 06 February 2018 in Transportation Research Congress 2016
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To analyze the effect of moist aggregate and multiple freeze-thaw cycles on moisture susceptibility of warm mix asphalt (WMA) containing organic wax additive (Sasobit), different target moisture contents (1%, 2%, 3%) of aggregates (limestone and basalt) are simulated using the bucket-mixer heating method in lab. The moisture susceptibility of WMA that composed of 3% Sasobit modified asphalt binder (by weight of SK-90 asphalt binder) and different types of dry/moist aggregates in one/two freeze-thaw cycles are test using the modified Lottman test. The test results show the moisture susceptibility of WMA linearly decreases significantly with the increase of moisture content and freeze-thaw cycle number. The moisture susceptibility of WMA made with moist aggregate cannot meet the current specification in China. However, under identical conditions (same moisture content and freeze-thaw cycle number), the moisture susceptibility of WMA made with basalt is better than that of WMA made with limestone.

ACS Style

Jie Ji; Peng Zhai; Zhi Suo; Ying Xu; Shi-Fa Xu. Analysis on Moisture Susceptibility of Warm Mix Asphalt Affected by Moist Aggregate and Multiple Freeze-Thaw Cycles. Transportation Research Congress 2016 2018, 1 .

AMA Style

Jie Ji, Peng Zhai, Zhi Suo, Ying Xu, Shi-Fa Xu. Analysis on Moisture Susceptibility of Warm Mix Asphalt Affected by Moist Aggregate and Multiple Freeze-Thaw Cycles. Transportation Research Congress 2016. 2018; ():1.

Chicago/Turabian Style

Jie Ji; Peng Zhai; Zhi Suo; Ying Xu; Shi-Fa Xu. 2018. "Analysis on Moisture Susceptibility of Warm Mix Asphalt Affected by Moist Aggregate and Multiple Freeze-Thaw Cycles." Transportation Research Congress 2016 , no. : 1.

Journal article
Published: 10 November 2017 in Applied Sciences
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This paper aims to study the preparation and viscoelastic properties of asphalt binder modified by tetrahydrofuran soluble fraction (THFS) extracted from direct coal liquefaction residue. The modified asphalt binders, which blended with SK-90 (control asphalt binder) and 4%, 6%, 8% and 10% THFS (by weight of SK-90), were fabricated. The preparation process for asphalt binder was optimized in terms of the orthogonal array test strategy and gray correlation analysis results. The properties of asphalt binder were measured by applying Penetration performance grade and Superpave performance grade specifications. In addition, the temperature step and frequency sweep test in Dynamic Shear Rheometer were conducted to predict the rheological behavior, temperature and frequency susceptibility of asphalt binder. The test results suggested the optimal preparation process, such as 150 °C shearing temperature, 45 min shearing time and 4000 rpm shearing rate. Subsequently, the addition of THFS was beneficial in increasing the high-temperature properties but decreased the low-temperature properties and resistance to fatigue. The content analysis of THFS showed the percentage of 4~6% achieved a balance in the high-and-low temperature properties of asphalt binder. The asphalt binder with higher THFS content exhibited higher resistance to rutting and less sensitivity to frequency and temperature.

ACS Style

Jie Ji; Hui Yao; Wenhua Zheng; Zhi Suo; Yuefeng Shi; Ying Xu; Hao Wu; Zhanping You. Preparation and Properties of Asphalt Binders Modified by THFS Extracted From Direct Coal Liquefaction Residue. Applied Sciences 2017, 7, 1155 .

AMA Style

Jie Ji, Hui Yao, Wenhua Zheng, Zhi Suo, Yuefeng Shi, Ying Xu, Hao Wu, Zhanping You. Preparation and Properties of Asphalt Binders Modified by THFS Extracted From Direct Coal Liquefaction Residue. Applied Sciences. 2017; 7 (11):1155.

Chicago/Turabian Style

Jie Ji; Hui Yao; Wenhua Zheng; Zhi Suo; Yuefeng Shi; Ying Xu; Hao Wu; Zhanping You. 2017. "Preparation and Properties of Asphalt Binders Modified by THFS Extracted From Direct Coal Liquefaction Residue." Applied Sciences 7, no. 11: 1155.

Journal article
Published: 01 March 2017 in Journal of Materials in Civil Engineering
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Traditional rejuvenators normally have a great deal of heavy fuel oils to supply the light oil component of asphalt binders, which decreases throughout a long-term aging process. However, heavy fuel oils can easily volatilize at a high recycling temperature (above 180°C), and this leads to a limited portion of reclaimed asphalt pavement (RAP) materials utilized in the recycled asphalt mixture (with a recycling rate less than 30%). Vegetable oils are rich in unsaturated fatty acids, which are similar to the light oil components, and have a better temperature resistance. Therefore, there is potential that vegetable oils can be utilized to recover the aged asphalt binder based on the asphalt rejuvenating mechanism. In this study, two rejuvenators with waste cooking vegetable oils (corn oil and soybean oil) to replace heavy oils and a commercial rejuvenator were used to recover the aged asphalt (extracted from RAP materials) with different ratios (by weight of asphalt) of 2, 4, 6, 8, and 10%. Dynamic shear rheometer (DSR) and rotational viscosity (RV) tests were used to evaluate the physical properties of the recovered asphalt binder. The low-temperature performance of the recovered asphalt binder was also evaluated by the bending beam rheometer (BBR) test. The laboratory tests and statistical analysis of variance (ANOVA) results show that the vegetable oil rejuvenators can effectively decrease the viscosity and stiffness of aged asphalt binder, which is beneficial for both fatigue and low-temperature cracking resistance. Furthermore, the rejuvenator can lower the viscosity and stiffness of the aged asphalt binder with a larger amount of vegetable oil. Overall, the vegetable oil content (6% to 8%) in the rejuvenator is proposed for recovering the aged asphalt binder in consideration of the rutting resistance under high temperatures.

ACS Style

Jie Ji; Hui Yao; Zhi Suo; Zhanping You; Haoxin Li; Shifa Xu; Lijun Sun. Effectiveness of Vegetable Oils as Rejuvenators for Aged Asphalt Binders. Journal of Materials in Civil Engineering 2017, 29, 1 .

AMA Style

Jie Ji, Hui Yao, Zhi Suo, Zhanping You, Haoxin Li, Shifa Xu, Lijun Sun. Effectiveness of Vegetable Oils as Rejuvenators for Aged Asphalt Binders. Journal of Materials in Civil Engineering. 2017; 29 (3):1.

Chicago/Turabian Style

Jie Ji; Hui Yao; Zhi Suo; Zhanping You; Haoxin Li; Shifa Xu; Lijun Sun. 2017. "Effectiveness of Vegetable Oils as Rejuvenators for Aged Asphalt Binders." Journal of Materials in Civil Engineering 29, no. 3: 1.

Research article
Published: 21 February 2017 in Advances in Materials Science and Engineering
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The objectives of this paper are to use Direct Coal Liquefaction Residue (DLCR) to modify the asphalt binders and mixtures and to evaluate the performance of modified asphalt mixtures. The dynamic modulus and phase angle of DCLR and DCLR-composite modified asphalt mixture were analyzed, and the viscoelastic properties of these modified asphalt mixtures were compared to the base asphalt binder SK-90 and Styrene-Butadiene-Styrene (SBS) modified asphalt mixtures. The master curves of the asphalt mixtures were shown, and dynamic and viscoelastic behaviors of asphalt mixtures were described using the Christensen-Anderson-Marasteanu (CAM) model. The test results show that the dynamic moduli of DCLR and DCLR-composite asphalt mixtures are higher than those of the SK-90 and SBS modified asphalt mixtures. Based on the viscoelastic parameters of CAM models of the asphalt mixtures, the high- and low-temperature performance of DLCR and DCLR-composite modified asphalt mixtures are obviously better than the SK-90 and SBS modified asphalt mixtures. In addition, the DCLR and DCLR-composite modified asphalt mixtures are more insensitive to the frequency compared to SK-90 and SBS modified asphalt mixtures.

ACS Style

Jie Ji; Hui Yao; Di Wang; Zhi Suo; Luhou Liu; Zhanping You. Properties of Direct Coal Liquefaction Residue Modified Asphalt Mixture. Advances in Materials Science and Engineering 2017, 2017, 1 -11.

AMA Style

Jie Ji, Hui Yao, Di Wang, Zhi Suo, Luhou Liu, Zhanping You. Properties of Direct Coal Liquefaction Residue Modified Asphalt Mixture. Advances in Materials Science and Engineering. 2017; 2017 ():1-11.

Chicago/Turabian Style

Jie Ji; Hui Yao; Di Wang; Zhi Suo; Luhou Liu; Zhanping You. 2017. "Properties of Direct Coal Liquefaction Residue Modified Asphalt Mixture." Advances in Materials Science and Engineering 2017, no. : 1-11.

Journal article
Published: 19 February 2017 in DEStech Transactions on Engineering and Technology Research
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Snow/ice Self-melting pavement is a new kind of pavement with asphalt mixtures containing anti-freeze additives. In this research, three kinds of anti-freeze additives (IB-A, IB-B and IB-C) were applied. IB-A is a chloride salt that contains four substances and IB-B is a sulfonate including two substances. IB-C is a kind of Phase change material. The performance of asphalt mixtures were evaluated by using a series of laboratory tests, such as high temperature resistance, low temperature crack resistance and moisture resistance. Furthermore, based on the surface contact mechanism relationship between ice and pavement surface, a test instrument was developed and a new method was proposed to evaluate snow/ice melting efficiency. The test results show that the asphalt mixture with IB-A has the highest snow/ice melting efficiency and IB-C has no difference with the control group. To balance the performance and snow/ice melting efficiency, the optimum anti-freeze filler content were determined and proposed to apply in the Zhangcheng highway pavement de-icing engineering.

ACS Style

Zhi Suo; Feng Guo; Jie Ji; Shanshan Jin; Ao Zhang. Comparison of the Effect of Different Anti-freeze Additives on the De-Icing Asphalt Mixtures. DEStech Transactions on Engineering and Technology Research 2017, 1 .

AMA Style

Zhi Suo, Feng Guo, Jie Ji, Shanshan Jin, Ao Zhang. Comparison of the Effect of Different Anti-freeze Additives on the De-Icing Asphalt Mixtures. DEStech Transactions on Engineering and Technology Research. 2017; (ictim):1.

Chicago/Turabian Style

Zhi Suo; Feng Guo; Jie Ji; Shanshan Jin; Ao Zhang. 2017. "Comparison of the Effect of Different Anti-freeze Additives on the De-Icing Asphalt Mixtures." DEStech Transactions on Engineering and Technology Research , no. ictim: 1.

Journal article
Published: 09 February 2017 in Applied Sciences
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The influence of organic additives (Sasobit and RH) and water on the adhesion of the asphalt-aggregate interface was studied according to the surface free energy theory. Two asphalt binders (SK-70 and SK-90), and two aggregate types (limestone and basalt) were used in this study. The sessile drop method was employed to test surface free energy components of asphalt, organic additives and aggregates. The adhesion models of the asphalt-aggregate interface in dry and wet conditions were established, and the adhesion work was calculated subsequently. The energy ratios were built to evaluate the effect of organic additives and water on the adhesiveness of the asphalt-aggregate interface. The results indicate that the addition of organic additives can enhance the adhesion of the asphalt-aggregate interface in dry conditions, because organic additives reduced the surface free energy of asphalt. However, the organic additives have hydrophobic characteristics and are sensitive to water. As a result, the adhesiveness of the asphalt-aggregate interface of the asphalt containing organic additives in wet conditions sharply decreased due to water damage to asphalt and organic additives. Furthermore, the compatibility of asphalt, aggregate with organic additive was noted and discussed.

ACS Style

Jie Ji; Hui Yao; Luhou Liu; Zhi Suo; Peng Zhai; Xu Yang; Zhanping You. Adhesion Evaluation of Asphalt-Aggregate Interface Using Surface Free Energy Method. Applied Sciences 2017, 7, 156 .

AMA Style

Jie Ji, Hui Yao, Luhou Liu, Zhi Suo, Peng Zhai, Xu Yang, Zhanping You. Adhesion Evaluation of Asphalt-Aggregate Interface Using Surface Free Energy Method. Applied Sciences. 2017; 7 (2):156.

Chicago/Turabian Style

Jie Ji; Hui Yao; Luhou Liu; Zhi Suo; Peng Zhai; Xu Yang; Zhanping You. 2017. "Adhesion Evaluation of Asphalt-Aggregate Interface Using Surface Free Energy Method." Applied Sciences 7, no. 2: 156.

Book chapter
Published: 28 April 2016 in Civil Engineering and Urban Planning IV
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ACS Style

Qi Man; Jing Wang; Shi-Fa Xu; Zhi Suo. Performance evaluation of the recycling asphalt binder regenerated with vegetable oil. Civil Engineering and Urban Planning IV 2016, 985 -987.

AMA Style

Qi Man, Jing Wang, Shi-Fa Xu, Zhi Suo. Performance evaluation of the recycling asphalt binder regenerated with vegetable oil. Civil Engineering and Urban Planning IV. 2016; ():985-987.

Chicago/Turabian Style

Qi Man; Jing Wang; Shi-Fa Xu; Zhi Suo. 2016. "Performance evaluation of the recycling asphalt binder regenerated with vegetable oil." Civil Engineering and Urban Planning IV , no. : 985-987.

Conference paper
Published: 19 October 2015 in New Frontiers in Road and Airport Engineering
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To analyze RAP, mixing mode and additives impacted on fatigue characteristics of recycled SMA asphalt mixtures, the hot and warm recycled SMA mixtures with 0%, 20%, and 30% RAP are designed. The warm recycled mixtures are prepared with adding 3% Sasobit into the hot recycled SMA mixture using dry-processing and wet-processing methods. Four-point bending fatigue test is conducted on the recycled mixtures, and the dissipated energy theory is employed to analyze fatigue characteristics of the recycled mixtures. It shows that: (1) the relationship between fatigue life and cumulative dissipated energy of the recycled mixtures does not change with the variation of RAP content and mixing mode. There is a good linear relationship between fatigue life and cumulative dissipated energy of the recycled mixtures, which can be represented by a unique relation equation. (2) When RAP content is lower than 20%, fatigue characteristics of the recycled mixtures has a little change, while when RAP content is higher than 20%, fatigue characteristics of the recycled mixtures experiences a sharp decline. (3) Sasobit additive has an adverse impact on fatigue characteristics of the mixtures without RAP.

ACS Style

Jie Ji; Zhi Suo; Song Yang; Ying Xu; Shifa Xu. Application of the Dissipated Energy Theory to Estimate the Fatigue Characteristics of Hot and Warm Recycled SMA Mixtures. New Frontiers in Road and Airport Engineering 2015, 1 .

AMA Style

Jie Ji, Zhi Suo, Song Yang, Ying Xu, Shifa Xu. Application of the Dissipated Energy Theory to Estimate the Fatigue Characteristics of Hot and Warm Recycled SMA Mixtures. New Frontiers in Road and Airport Engineering. 2015; ():1.

Chicago/Turabian Style

Jie Ji; Zhi Suo; Song Yang; Ying Xu; Shifa Xu. 2015. "Application of the Dissipated Energy Theory to Estimate the Fatigue Characteristics of Hot and Warm Recycled SMA Mixtures." New Frontiers in Road and Airport Engineering , no. : 1.

Journal article
Published: 01 December 2014 in Advanced Materials Research
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The reclaimed asphalt pavement (RAP) materials with aged SBS bitumen were limited to applied in unmodified asphalt mixture for low level pavement structure by conventional recycling technology. To overcome this, a new recycling procedure was developed to recover the aged SBS RAP as modified asphalt mixture by warm mixing technology. The Marshall method was applied to design Warm Recycled SBS modified Asphalt Mixture (WRMA) with different RAP content (0, 20%, 30%, 40% and 50%). the performance properties of WRMA and hot recycled SBS modified asphalt mixture (HRMA), such as the high temperature stability, water stability and low temperature performance, were evaluated by the rutting test, low-temperature creep test, beam bending test and water immersion Marshall test, respectively. From the testing results, the properties of WRMA was more than HRMA significantly, and the warm recycling technology could effectively increase the RAP content applied in recycled pavement materials.

ACS Style

Rui Tian; Shi Fa Xu; Zhi Suo; Guang You Yuan. Performance Evaluation of Warm Recycled SBS Modified Asphalt Mixture. Advanced Materials Research 2014, 1065-1069, 771 -777.

AMA Style

Rui Tian, Shi Fa Xu, Zhi Suo, Guang You Yuan. Performance Evaluation of Warm Recycled SBS Modified Asphalt Mixture. Advanced Materials Research. 2014; 1065-1069 ():771-777.

Chicago/Turabian Style

Rui Tian; Shi Fa Xu; Zhi Suo; Guang You Yuan. 2014. "Performance Evaluation of Warm Recycled SBS Modified Asphalt Mixture." Advanced Materials Research 1065-1069, no. : 771-777.

Journal article
Published: 20 November 2013 in Procedia - Social and Behavioral Sciences
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Warm mix asphalt (WMA) has been popularly used in all over the world to reduce both energy consumptions and carbon emissions in asphalt paving industry. The long-term aging characterization of binders containing WMA additive was evaluated in this research. The penetration grade 60/80 and SBS modified binders were selected as virgin materials. The Sasobit, WMA additive, was blended into virgin materials with 2%, 3%, 4% and 5% by weight of binders. The warm modified binders were aged by means of the rolling thin film oven (RTFO) and pressure aging vessel (PAV). A serial of laboratory studies, such as Penetration, four-constituents, rotational viscometer (RV), dynamic shear rheometer (DSR) and bending beam rheometer (BBR), were conducted on both virgin binders and long-term aging binders. The aged rates of binders were calculated and compared. The results showed that the virgin binders played an important role in the determination of warm modified binder's properties and colloid-structures. However, compared to the aging regulation of virgin and warm modified binders, Sasobit had no or marginally positive influence on the long-term aging characterization (affected by virgin binder type) of warm modified binders.

ACS Style

Jie Ji; Zhi Suo; Ying Xu. Laboratory Evaluation on the Long-term Aging Characterization of Warm Modified Binders. Procedia - Social and Behavioral Sciences 2013, 96, 1640 -1647.

AMA Style

Jie Ji, Zhi Suo, Ying Xu. Laboratory Evaluation on the Long-term Aging Characterization of Warm Modified Binders. Procedia - Social and Behavioral Sciences. 2013; 96 ():1640-1647.

Chicago/Turabian Style

Jie Ji; Zhi Suo; Ying Xu. 2013. "Laboratory Evaluation on the Long-term Aging Characterization of Warm Modified Binders." Procedia - Social and Behavioral Sciences 96, no. : 1640-1647.