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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.
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 StyleRan 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 StyleRan 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.
It has been widely observed that sulfate attack can damage the durability of concrete. This research investigated the mass loss and damage degree of concrete under sodium sulfate attack incorporated with drying-wetting cycles. The impact factors, including water-binder ratio, solution concentration of sodium sulfate, fly ash content, curing time, and drying-wetting cycle system, were observed to influence the sodium sulfate attack by the mass loss rate and damage degree at regular time intervals. Also, the hydrates of sulfate-attacked samples were analyzed using X-ray diffraction. Results indicated that a high water-binder and high-concentration sodium sulfate solution could accelerate the transportation of sulfate ion inside the concrete and the deterioration degree of concrete. Appropriate fly ash and longer curing time can effectively improve the internal pore structure of concrete to reduce the sulfate corrosion damage. The sulfate ion erosion and deterioration degree of the concrete are synchronously intensified along with the increase of the baking-immersing time ratio. The trend of the predicted life for concrete is basically consistent with the damage evolution result, indicating the feasibility of the Weibull distribution model to predict the service life of concrete under sodium sulfate attack incorporated with drying-wetting cycles.
Fang Liu; Zhanping You; Rui Xiong; Xu Yang. Effects of Sodium Sulfate Attack on Concrete Incorporated with Drying-Wetting Cycles. Advances in Civil Engineering 2021, 2021, 1 -12.
AMA StyleFang Liu, Zhanping You, Rui Xiong, Xu Yang. Effects of Sodium Sulfate Attack on Concrete Incorporated with Drying-Wetting Cycles. Advances in Civil Engineering. 2021; 2021 ():1-12.
Chicago/Turabian StyleFang Liu; Zhanping You; Rui Xiong; Xu Yang. 2021. "Effects of Sodium Sulfate Attack on Concrete Incorporated with Drying-Wetting Cycles." Advances in Civil Engineering 2021, no. : 1-12.
In recent decades, polymer-modified asphalt materials have been used in response to increased traffic on the roads. The main objective of this paper is to explore the modification effect of thermoplastics on asphalt binders and investigate the effectiveness of maleic anhydride in improving interfacial adhesion. Three different thermoplastics were used with a dosage of 4 wt%. and a co-reactant maleic anhydride was added with a content of 2 wt% by weight of the binder. The thermoplastics showed a great improvement on high-temperature performance grade (PG) and a slight decrease on low-temperature PG. In addition, the usage of maleic anhydride enhanced the high performance PG on all plastic modified binders. With the addition of maleic anhydride, the binders increased a few degrees of higher temperature, indicating an improvement in compatibility. The compatibility improvement may be related to form a copolymer where maleic anhydride modified with different asphalt components. With the addition of maleic anhydride, the Jnr decreased and the percent recovery increased, which showed a better interaction between plastic and asphalt binders. High-temperature PG results in Unified Performance Tests by incremental Method (UPTiM) were strongly connected with Jnr3.2 in Multiple Stress Creep Recovery test with a power fit trend, where its R2 was 0.97. Based upon results obtained, it can be concluded that the performance of the resulting asphalt can be improved when maleic anhydride was used to treat the added thermoplastics.
Siyu Chen; Tiankai Che; Alaeddin Mohseni; Haleh Azari; Patricia A. Heiden; Zhanping You. Preliminary study of modified asphalt binders with thermoplastics: The Rheology properties and interfacial adhesion between thermoplastics and asphalt binder. Construction and Building Materials 2021, 301, 124373 .
AMA StyleSiyu Chen, Tiankai Che, Alaeddin Mohseni, Haleh Azari, Patricia A. Heiden, Zhanping You. Preliminary study of modified asphalt binders with thermoplastics: The Rheology properties and interfacial adhesion between thermoplastics and asphalt binder. Construction and Building Materials. 2021; 301 ():124373.
Chicago/Turabian StyleSiyu Chen; Tiankai Che; Alaeddin Mohseni; Haleh Azari; Patricia A. Heiden; Zhanping You. 2021. "Preliminary study of modified asphalt binders with thermoplastics: The Rheology properties and interfacial adhesion between thermoplastics and asphalt binder." Construction and Building Materials 301, no. : 124373.
Surface segregation of bituminous mixtures is a criterion of pavement quality and largely affects the characteristics of the pavement. Simple yet effective evaluation of the surface segregation will enable pavement engineers to tailor timely strategies to mitigate the problem. In this paper, a more efficient image processing method with the aid of smartphone imaging was adopted to rate the segregation level of asphalt pavement surface. Twenty-seven asphalt mixture specimens with vast differences were prepared to acquire different surface images using three types of smartphones. A field test section was chosen to validate the practicability. Furthermore, the Fractal Dimensions (FD, DBC-FD) and Percentage of Concave Distribution Area (PCDA) were used to characterize Concave Distribution Characteristics (CDC) of asphalt pavement surface. Texture Depth (TD) and Mean Texture Depth (MTD) were gained through the sand patch method. It was found that it is an encouraging approach to evaluate the surface segregation based on CDC. The image processing technique relying on the selected smartphone type was proposed by the error rate of reliability analysis, which was not more than 3% compared to the other used smartphones. A newly developed indicator called e was presented to stand for PCDA. The coefficient of determination between e, FD, DBC-FD and TD/MTD are respectively 0.7958, 0.7882, and 0.7585. In the field validation, the coefficient of determination between e and TD/MTD reaches to 0.8546. Therefore, it was demonstrated that the proposed image processing method can be a promising approach to rate the segregation of asphalt pavement surface.
Tongtong Wan; Hainian Wang; Ponan Feng; Aboelkasim Diab. Concave distribution characterization of asphalt pavement surface segregation using smartphone and image processing based techniques. Construction and Building Materials 2021, 301, 124111 .
AMA StyleTongtong Wan, Hainian Wang, Ponan Feng, Aboelkasim Diab. Concave distribution characterization of asphalt pavement surface segregation using smartphone and image processing based techniques. Construction and Building Materials. 2021; 301 ():124111.
Chicago/Turabian StyleTongtong Wan; Hainian Wang; Ponan Feng; Aboelkasim Diab. 2021. "Concave distribution characterization of asphalt pavement surface segregation using smartphone and image processing based techniques." Construction and Building Materials 301, no. : 124111.
The ability of latex to notably improve the performance of asphalt pavements has established the material as a favorable modifier in asphalt systems. However, the high viscosity of latex-modified asphalt (LMA) binders significantly increases the production temperature of asphalt mixtures. One effective way to resolve this problem is by employing foaming technology, which was investigated in this study. Diluted methanol was used as a foaming agent due to its lower boiling point and energy consumption compared with water. Asphalt binder of penetration grade 60/70 was utilized as the binding agent. Latex accounted for 6% of the total weight of the asphalt binder. In this study, 1% water and 3% diluted methanol were added as foaming agents. The basic and rheological properties of asphalt binders were examined via different tests, for example, softening point, decay curves, rotational viscosity, torsional recovery, and dynamic shear rheometer. The findings showed that the presence of latex contributed to higher softening point, viscosity, elastic property, and rutting resistance to improve the pavement durability. The foaming agents (water or diluted methanol) decreased the viscosity and improved the expansion ratio producing better workability and aggregate coating during mixture production.
Guo Tai; Mohd Rosli Mohd Hasan; Hainian Wang; Sharvin Poovaneshvaran; Ashiru Sani; Muhammad Khuzaimi Aziz. Characteristics of Latex-Modified Bitumen Prepared via Foaming Technique Using Water and Diluted Methanol. Journal of Materials in Civil Engineering 2021, 33, 04021166 .
AMA StyleGuo Tai, Mohd Rosli Mohd Hasan, Hainian Wang, Sharvin Poovaneshvaran, Ashiru Sani, Muhammad Khuzaimi Aziz. Characteristics of Latex-Modified Bitumen Prepared via Foaming Technique Using Water and Diluted Methanol. Journal of Materials in Civil Engineering. 2021; 33 (7):04021166.
Chicago/Turabian StyleGuo Tai; Mohd Rosli Mohd Hasan; Hainian Wang; Sharvin Poovaneshvaran; Ashiru Sani; Muhammad Khuzaimi Aziz. 2021. "Characteristics of Latex-Modified Bitumen Prepared via Foaming Technique Using Water and Diluted Methanol." Journal of Materials in Civil Engineering 33, no. 7: 04021166.
The construction industry is the largest consumer of raw materials which are under the risk of exhaustion and depletion in the near future, which has prompted the usage of waste materials for the conservation of resource and as a solution for waste management. Two wastes that are widely produced but often inefficiently disposed are eggshell and waste tire. Hence, this paper aims to evaluate the rheological and mechanical properties of concrete incorporating eggshell and waste tire rubber using Response Surface Methodology (RSM). Concrete with eggshell as cement replacement and waste tire rubber as sand replacement was prepared with an interval of 5% up to 15% replacement of both materials. Rheological properties of concrete were accessed using slump cone test while mechanical properties were studied through compressive strength and flexural strength test. Result showed that eggshell replacement has a minor effect on concrete slump while tire rubber reduces workability considerably. Result also showed that concrete mechanical strength was optimum at 5% and 10% eggshell replacement, while tire rubber reduced mechanical strength with percentage of replacement. Non-destructive tests indicated that concrete has excellent quality but excessive tire replacement beyond 10% compromised structural integrity of concrete. Overall, RSM models were able to model the properties of concrete with high accuracy and minimal deviation.
Rokiah Othman; Beng Wei Chong; Ramadhansyah Putra Jaya; Mohd Rosli Mohd Hasan; Mohd Mustafa Al Bakri Abdullah; Mohd Haziman Wan Ibrahim. Evaluation on the Rheological and Mechanical Properties of Concrete Incorporating Eggshell with Tire Powder. Journal of Materials Research and Technology 2021, 14, 439 -451.
AMA StyleRokiah Othman, Beng Wei Chong, Ramadhansyah Putra Jaya, Mohd Rosli Mohd Hasan, Mohd Mustafa Al Bakri Abdullah, Mohd Haziman Wan Ibrahim. Evaluation on the Rheological and Mechanical Properties of Concrete Incorporating Eggshell with Tire Powder. Journal of Materials Research and Technology. 2021; 14 ():439-451.
Chicago/Turabian StyleRokiah Othman; Beng Wei Chong; Ramadhansyah Putra Jaya; Mohd Rosli Mohd Hasan; Mohd Mustafa Al Bakri Abdullah; Mohd Haziman Wan Ibrahim. 2021. "Evaluation on the Rheological and Mechanical Properties of Concrete Incorporating Eggshell with Tire Powder." Journal of Materials Research and Technology 14, no. : 439-451.
Cathode-ray-tube (CRT) is the ingredient of glass used in obsolescent televisions or computer monitors. CRT glass contains a considerable amount of heavy metals, and the landfilling of CRT glass is significantly harmful to the environment. In an effort to recycle waste CRT glass instead of landfilling it, recycled CRT glass powders were introduced to asphalt binders as a modifier in this preliminary investigation. The recycled CRT glass was processed to a particle size smaller than 0.075 mm and mixed with asphalt binder (PG 58–28) to produce asphalt mastics with four different concentrations (0, 5, 10, and 15 wt%). The rheological performance was characterized with the rotational viscosity (RV), dynamic shear rheometer (DSR), and multiple stress creep recovery (MSCR) tests. The fatigue performance was evaluated by linear amplitude sweep (LAS) test. Meanwhile, the low-temperature properties were measured by the asphalt binder cracking device (ABCD). The hazard materials leaching test was applied to evaluate the leaching potential of lead content into the external environment due to the high lead content in the modified asphalt. The test results revealed that the increase of CRT glass powder content improved the energy of activation compared with that of virgin binder, as well as the resistance of permanent deformation. Furthermore, the incorporation of CRT glass powder may slightly increase the fatigue life of asphalt because of the improved physicochemical interaction between glass and bitumen. The low-temperature cracking temperature first decreased with the increase of CRT glass powder content and then increased as the CRT content increased further. The leaching test demonstrated that the CRT glass powders incorporated into asphalt binders represented a lower lead leaching content than that of the original CRT glass powder, where the lead leaching amount of CRT glass modified asphalt binder is obviously lower than the specified level of 5 mg/L. Therefore, it is possibly acceptable to recycle CRT glass powders in asphalt binders as an additive as an environmental-friendly recycling method, in which the optimal addition content of CRT glass powders could be up to 10% (wt.).
Dongzhao Jin; Jiaqing Wang; Lingyun You; Dongdong Ge; Chaochao Liu; Hongfu Liu; Zhanping You. Waste cathode-ray-tube glass powder modified asphalt materials: Preparation and characterization. Journal of Cleaner Production 2021, 314, 127949 .
AMA StyleDongzhao Jin, Jiaqing Wang, Lingyun You, Dongdong Ge, Chaochao Liu, Hongfu Liu, Zhanping You. Waste cathode-ray-tube glass powder modified asphalt materials: Preparation and characterization. Journal of Cleaner Production. 2021; 314 ():127949.
Chicago/Turabian StyleDongzhao Jin; Jiaqing Wang; Lingyun You; Dongdong Ge; Chaochao Liu; Hongfu Liu; Zhanping You. 2021. "Waste cathode-ray-tube glass powder modified asphalt materials: Preparation and characterization." Journal of Cleaner Production 314, no. : 127949.
The experimental investigation of the effects of filler-bitumen interaction on the stiffening and shearing characteristics of asphalt mastic is presented in this paper. The role of filler particles in terms of particle dispersion, particle sedimentation rate, particle dissipation energy, and their shearing response as a function of their viscosities under different concentrations was analysed. Structural and geometrical morphological tests of the filler particles were also carried out using the Scanning Electron Microscope (SEM) analysis. A neat bitumen of 60/70 penetration grade and two alternative mineral fillers, namely lime kiln dust (LKD) and dolomite powder (DP), were used to produce asphalt mastic mixture at a filler- bitumen ratio (F/B) of 0.4, 0.8, and 1.2 in accordance with the Superpave mix design dust to binder ratio specification. The two individual fillers particle size gradations, was assessed using a laser diffraction technique. The delta ring and ball, as well as the penetration index tests were conducted to determine the physical properties of the asphalt mastic. The shearing response of the asphalt mastic was also determined using a rotational viscometer (RV) device for various shear values at mastic mixing temperature. The results of the study inferred that the stiffening ability of mineral fillers was more dependent on the physical filler properties, such as particle surface area, voids between the interstices of particles, the concentration of particles, and the crowding distance of the particles in the asphalt mastic. It also revealed that the resistance of a neat bitumen to shearing occurs in a shear-thinning response behaviour, while that of an asphalt mastic occurs more as a shear thickening resistance response. The morphological analysis of both the fillers highlighted the differences in voids, fines, surface area, and particle shape structure of the two fillers.
Najib Mukhtar; Mohd Rosli Mohd Hasan; Mohd Fahmi Haikal Mohd Ghazali; Zainiah Mohd Zin; Khairul Anuar Shariff; Ashiru Sani. Influence of concentration and packing of filler particles on the stiffening effect and shearing behaviour of asphalt mastic. Construction and Building Materials 2021, 295, 123660 .
AMA StyleNajib Mukhtar, Mohd Rosli Mohd Hasan, Mohd Fahmi Haikal Mohd Ghazali, Zainiah Mohd Zin, Khairul Anuar Shariff, Ashiru Sani. Influence of concentration and packing of filler particles on the stiffening effect and shearing behaviour of asphalt mastic. Construction and Building Materials. 2021; 295 ():123660.
Chicago/Turabian StyleNajib Mukhtar; Mohd Rosli Mohd Hasan; Mohd Fahmi Haikal Mohd Ghazali; Zainiah Mohd Zin; Khairul Anuar Shariff; Ashiru Sani. 2021. "Influence of concentration and packing of filler particles on the stiffening effect and shearing behaviour of asphalt mastic." Construction and Building Materials 295, no. : 123660.
To provide a new method for the evaluation of the compaction quality of asphalt mixture, a real-time data acquisition and processing system (RDAPS) for the motion state of aggregate with a small volume and high precision is developed. The system consists of an intelligent aggregate (IA), analysis software and hardware equipment. The performance of the IA was tested by regarding data sensitivity, high-temperature resistance, and mechanical properties. A new evaluation method was proposed for evaluating the compaction quality of AC-25 and SMA-25 asphalt mixtures based on an IA. The results show that the best transmission baud rate for the IA was 9600 bps, and the corresponding signal transmission distance was 380 m. Only one IA was needed to complete the state data collection for the aggregate within the asphalt mixture in a circular area, with the IA layout point as the center of the circle and a radius of 5 m. The IA conducted reliable data transmission up to 200 °C; however, its compressive strength decreased with increasing temperature until reaching stability. Traditional aggregate could be replaced by an IA to withstand external forces and internal load transfer. Embedding an IA into AC-25 or SMA-25 asphalt mixtures did not have a significant impact on the original mechanical properties of the mixture. The effect of the gradation type of the asphalt mixture on the IA motion state was not significant. When the compaction degree met the specification requirements, the motion data of the IA did not reach a stable state, and the interlocking effect between aggregates in the asphalt mixture could be further optimized. An evaluation method is proposed based on the IA for the compaction quality of AC-25 and SMA-25 asphalt mixtures with the compaction degree as the main index and the spatial attitude angle and spatial acceleration of the IA as the auxiliary indexes.
Chen Zhang; Hainian Wang. A New Method for Compaction Quality Evaluation of Asphalt Mixtures with the Intelligent Aggregate (IA). Materials 2021, 14, 2422 .
AMA StyleChen Zhang, Hainian Wang. A New Method for Compaction Quality Evaluation of Asphalt Mixtures with the Intelligent Aggregate (IA). Materials. 2021; 14 (9):2422.
Chicago/Turabian StyleChen Zhang; Hainian Wang. 2021. "A New Method for Compaction Quality Evaluation of Asphalt Mixtures with the Intelligent Aggregate (IA)." Materials 14, no. 9: 2422.
Cold in-place recycling (CIR) asphalt mixtures are an attractive eco-friendly method for rehabilitating asphalt pavement. However, the on-site CIR asphalt mixture generally has a high air void because of the moisture content during construction, and the moisture susceptibility is vital for estimating the road service life. Therefore, the main purpose of this research is to characterize the effect of moisture on the high-temperature and low-temperature performance of a CIR asphalt mixture to predict CIR pavement distress based on a mechanistic–empirical (M-E) pavement design. Moisture conditioning was simulated by the moisture-induced stress tester (MIST). The moisture susceptibility performance of the CIR asphalt mixture (pre-mist and post-mist) was estimated by a dynamic modulus test and a disk-shaped compact tension (DCT) test. In addition, the standard solvent extraction test was used to obtain the reclaimed asphalt pavement (RAP) and CIR asphalt. Asphalt binder performance, including higher temperature and medium temperature performance, was evaluated by dynamic shear rheometer (DSR) equipment and low-temperature properties were estimated by the asphalt binder cracking device (ABCD). Then the predicted pavement distresses were estimated based on the pavement M-E design method. The experimental results revealed that (1) DCT and dynamic modulus tests are sensitive to moisture conditioning. The dynamic modulus decreased by 13% to 43% at various temperatures and frequencies, and the low-temperature cracking energy decreased by 20%. (2) RAP asphalt incorporated with asphalt emulsion decreased the high-temperature rutting resistance but improved the low-temperature anti-cracking and the fatigue life. The M-E design results showed that the RAP incorporated with asphalt emulsion reduced the international roughness index (IRI) and AC bottom-up fatigue predictions, while increasing the total rutting and AC rutting predictions. The moisture damage in the CIR pavement layer also did not significantly affect the predicted distress with low traffic volume. In summary, the implementation of CIR technology in the project improved low-temperature cracking and fatigue performance in the asphalt pavement. Meanwhile, the moisture damage of the CIR asphalt mixture accelerated high-temperature rutting and low-temperature cracking, but it may be acceptable when used for low-volume roads.
Dongzhao Jin; Dongdong Ge; Siyu Chen; Tiankai Che; Hongfu Liu; Lance Malburg; Zhanping You. Cold In-Place Recycling Asphalt Mixtures: Laboratory Performance and Preliminary M-E Design Analysis. Materials 2021, 14, 2036 .
AMA StyleDongzhao Jin, Dongdong Ge, Siyu Chen, Tiankai Che, Hongfu Liu, Lance Malburg, Zhanping You. Cold In-Place Recycling Asphalt Mixtures: Laboratory Performance and Preliminary M-E Design Analysis. Materials. 2021; 14 (8):2036.
Chicago/Turabian StyleDongzhao Jin; Dongdong Ge; Siyu Chen; Tiankai Che; Hongfu Liu; Lance Malburg; Zhanping You. 2021. "Cold In-Place Recycling Asphalt Mixtures: Laboratory Performance and Preliminary M-E Design Analysis." Materials 14, no. 8: 2036.
Concrete mix design and the determination of concrete performance are not merely engineering studies, but also mathematical and statistical endeavors. The study of concrete mechanical properties involves a myriad of factors, including, but not limited to, the amount of each constituent material and its proportion, the type and dosage of chemical additives, and the inclusion of different waste materials. The number of factors and combinations make it difficult, or outright impossible, to formulate an expression of concrete performance through sheer experimentation. Hence, design of experiment has become a part of studies, involving concrete with material addition or replacement. This paper reviewed common design of experimental methods, implemented by past studies, which looked into the analysis of concrete performance. Several analysis methods were employed to optimize data collection and data analysis, such as analysis of variance (ANOVA), regression, Taguchi method, Response Surface Methodology, and Artificial Neural Network. It can be concluded that the use of statistical analysis is helpful for concrete material research, and all the reviewed designs of experimental methods are helpful in simplifying the work and saving time, while providing accurate prediction of concrete mechanical performance.
Beng Chong; Rokiah Othman; Ramadhansyah Putra Jaya; Mohd Mohd Hasan; Andrei Sandu; Marcin Nabiałek; Bartłomiej Jeż; Paweł Pietrusiewicz; Dariusz Kwiatkowski; Przemysław Postawa; Mohd Abdullah. Design of Experiment on Concrete Mechanical Properties Prediction: A Critical Review. Materials 2021, 14, 1866 .
AMA StyleBeng Chong, Rokiah Othman, Ramadhansyah Putra Jaya, Mohd Mohd Hasan, Andrei Sandu, Marcin Nabiałek, Bartłomiej Jeż, Paweł Pietrusiewicz, Dariusz Kwiatkowski, Przemysław Postawa, Mohd Abdullah. Design of Experiment on Concrete Mechanical Properties Prediction: A Critical Review. Materials. 2021; 14 (8):1866.
Chicago/Turabian StyleBeng Chong; Rokiah Othman; Ramadhansyah Putra Jaya; Mohd Mohd Hasan; Andrei Sandu; Marcin Nabiałek; Bartłomiej Jeż; Paweł Pietrusiewicz; Dariusz Kwiatkowski; Przemysław Postawa; Mohd Abdullah. 2021. "Design of Experiment on Concrete Mechanical Properties Prediction: A Critical Review." Materials 14, no. 8: 1866.
This study explored the relationship between air voids and permeability, and investigated the correlation between air void type, coefficient of permeability, mechanical properties, and moisture damage in hot-mix asphalt (HMA). Six asphalt mixtures were prepared with air voids ranging from 4% to 19% in increments of 3%. Major tests, including two air void tests, a penetration test, and a dynamic water scouring test, were conducted to assess the moisture damage by measuring and comparing the difference in air voids and permeability before and after the dynamic water scouring. A compressive test was conducted to evaluate the residual strength of HMA with different porosities. Results indicated that the effective voids and coefficient of permeability had a strong correlation. There was an obvious increase of effective voids and permeability for specimens with air voids from 10% to 13% after dynamic water scouring tests. In terms of compressive strength, specimens with air voids from 7% to 13% had greater strength loss and deformation than other specimens, indicating that moisture damage occurred and developed rapidly in asphalt mixtures within a certain porosity range.
Tiankai Che; Baofeng Pan; Dong Sha; Yuanteng Zhang; Zhanping You. Relationship between Air Voids and Permeability: Effect on Water Scouring Resistance in HMA. Journal of Materials in Civil Engineering 2021, 33, 04021022 .
AMA StyleTiankai Che, Baofeng Pan, Dong Sha, Yuanteng Zhang, Zhanping You. Relationship between Air Voids and Permeability: Effect on Water Scouring Resistance in HMA. Journal of Materials in Civil Engineering. 2021; 33 (4):04021022.
Chicago/Turabian StyleTiankai Che; Baofeng Pan; Dong Sha; Yuanteng Zhang; Zhanping You. 2021. "Relationship between Air Voids and Permeability: Effect on Water Scouring Resistance in HMA." Journal of Materials in Civil Engineering 33, no. 4: 04021022.
The compatibility between asphalt and nanosilica (nano-SiO2) is critical to determine the performance of nano-SiO2–modified asphalt. However, a comprehensive understanding of the compatibility behavior and mechanism of asphalt components and nano-SiO2 in the modified asphalt is still limited. In this study, the compatibility was revealed through molecular dynamics (MD) simulation. Virgin asphalt, nano-SiO2–modified asphalt, and oxidation aged asphalt models produced with the COMPASS force field; meanwhile, the proposed models were validated by comparisons with reference data. The compatibility of asphalt and nano-SiO2 was analyzed by solubility and the Flory–Huggins parameters and interaction energy. Results show that the solubility parameters decreased with the increase of system temperature while increased with the asphalt’s oxidation level increase. Meanwhile, the compatibility of the asphaltene, resin, and aromatic components in asphalt is better than the compatibility with saturates, which may be due to saturates being volatile; however, the compatibility of the nano-SiO2 and saturates is much better than those with asphaltene, resin, and aromatic components. The incorporation of nano-SiO2 alleviates the volatilization of saturates. The present results provide insights into the understanding of the compatibility behavior and mechanism of nano-SiO2 and asphalt components.
Zhengwu Long; Sijia Zhou; Shaoting Jiang; Wenbo Ma; Yanhuai Ding; Lingyun You; Xianqiong Tang; Fu Xu. Revealing compatibility mechanism of nanosilica in asphalt through molecular dynamics simulation. Journal of Molecular Modeling 2021, 27, 1 -14.
AMA StyleZhengwu Long, Sijia Zhou, Shaoting Jiang, Wenbo Ma, Yanhuai Ding, Lingyun You, Xianqiong Tang, Fu Xu. Revealing compatibility mechanism of nanosilica in asphalt through molecular dynamics simulation. Journal of Molecular Modeling. 2021; 27 (3):1-14.
Chicago/Turabian StyleZhengwu Long; Sijia Zhou; Shaoting Jiang; Wenbo Ma; Yanhuai Ding; Lingyun You; Xianqiong Tang; Fu Xu. 2021. "Revealing compatibility mechanism of nanosilica in asphalt through molecular dynamics simulation." Journal of Molecular Modeling 27, no. 3: 1-14.
The objective of this paper is to review the current characterization and evaluation methods and introduce emerging technologies of aggregate morphologies in asphalt mixture through conventional tests and imaging techniques that would be possibly applied to analyze and evaluate the morphological features of particles. The current evaluating-characterizing method is defined as a procedure that has been shown by experience or research to obtain satisfying results, that is established or proposed as a standard suitable for general application. This review first identified the methods based on laboratory tests to characterize and evaluate the morphologies of the aggregate particle. Then, an attempt was made to study the existing methodologies from different points of view, accompanied by extensive comparisons on three categories of imaging techniques-early imaging techniques, dynamic imaging techniques, and static imaging techniques to facilitate further research studies. Additionally, the evaluation parameters of aggregate morphologies based on image technologies were represented. Finally, a comparative evaluation between different conventional testing methods and different imaging techniques through basic tools, application conditions, advantages, and disadvantages were conducted. This review concluded with some recommendations and conclusions in terms of morphological characterization and evaluation of aggregates in the asphalt mixture to materials selection during the mixture design and construction.
Fangyuan Gong; Yu Liu; Zhanping You; Xiaodong Zhou. Characterization and evaluation of morphological features for aggregate in asphalt mixture: A review. Construction and Building Materials 2020, 273, 121989 .
AMA StyleFangyuan Gong, Yu Liu, Zhanping You, Xiaodong Zhou. Characterization and evaluation of morphological features for aggregate in asphalt mixture: A review. Construction and Building Materials. 2020; 273 ():121989.
Chicago/Turabian StyleFangyuan Gong; Yu Liu; Zhanping You; Xiaodong Zhou. 2020. "Characterization and evaluation of morphological features for aggregate in asphalt mixture: A review." Construction and Building Materials 273, no. : 121989.
The clump-based discrete element model is one of the asphalt mixture simulation methods, which has the potential to not only predict mixture performance but also simulate particle movement during compaction, transporting, and other situations. However, modelling of asphalt sand mortar in this method remains to be a problem due to computing capacity. Larger-sized balls (generally 2.0–2.36 mm) were usually used to model the smaller particles and asphalt binder, but this replacement may result in the mixture’s unrealistic volumetric features. More specifically, replacing original elements with equal volume but larger size particles will increase in buck volume and then different particle contacting states. The major objective of this research is to provide a solution to the dilemma situation through an improved equivalent model of the smaller particles and asphalt binders. The key parameter of the equivalent model is the diameter reduction factor (DRF), which was proposed in this research to minimize the effects of asphalt mortar’s particle replacement modelling. To determine DRF, the DEM-based analysis was conducted to evaluate several mixture features, including element overlap ratio, ball-wall contact number, and the average wall stress. Through this study, it was observed that when the original glued ball diameters are ranging from 2.00 mm and 2.36 mm, the diameter reduction factor changes from 0.82 to 0.86 for AC mixtures and 0.80 to 0.84 for SMA mixtures. The modelling method presented in this research is suitable not only for asphalt mixtures but also for the other particulate mix with multisize particles.
Yu Liu; Peifeng Su; Miaomiao Li; Hui Yao; Junfu Liu; Mei Xu; Xiaodong Zhou; Zhanping You. How to Achieve Efficiency and Accuracy in Discrete Element Simulation of Asphalt Mixture: A DRF-Based Equivalent Model for Asphalt Sand Mortar. Advances in Civil Engineering 2020, 2020, 1 -10.
AMA StyleYu Liu, Peifeng Su, Miaomiao Li, Hui Yao, Junfu Liu, Mei Xu, Xiaodong Zhou, Zhanping You. How to Achieve Efficiency and Accuracy in Discrete Element Simulation of Asphalt Mixture: A DRF-Based Equivalent Model for Asphalt Sand Mortar. Advances in Civil Engineering. 2020; 2020 ():1-10.
Chicago/Turabian StyleYu Liu; Peifeng Su; Miaomiao Li; Hui Yao; Junfu Liu; Mei Xu; Xiaodong Zhou; Zhanping You. 2020. "How to Achieve Efficiency and Accuracy in Discrete Element Simulation of Asphalt Mixture: A DRF-Based Equivalent Model for Asphalt Sand Mortar." Advances in Civil Engineering 2020, no. : 1-10.
The aim of this research is using a waste wood–based bio-oil as the modifier of petroleum asphalt and analyzing its modification mechanism. The four components, infrared spectrum, and molecular weight distribution analysis were performed to investigate the chemical performance of control binder and bioasphalts. A conventional petroleum asphalt PG 64-22 was employed as the control binder. The bio-oil with addition of 10%, 15%, and 25% by weight was used to prepare bioasphalts (BMA). Meanwhile, the Gas Chromatograph Mass Spectrometer (GC-MS) and oven heating tests were conducted to explore the chemical compounds and their approximate contents in bio-oil. Results demonstrated that the bio-oil significantly changed the contents of chemical components in asphalt binder by decreasing the contents of saturates and asphaltenes and increasing the aromatics and resins contents. The modification of petroleum asphalt by bio-oil is not only a physical mixing but also a chemical process. Some chemical reactions were deduced between the PG 64-22 and bio-oil based on the infrared spectrum analysis. The added bio-oil converted some large molecules into small molecules. There are various chemical compounds in the bio-oil. Higher content of aromatic compounds and many lightweight compounds can explain the softer quality of bioasphalt and its inferior high temperature properties in comparison to petroleum asphalt.
Ran Zhang; Jie Ji; Zhanping You; Hainian Wang. Modification Mechanism of Using Waste Wood–Based Bio-Oil to Modify Petroleum Asphalt. Journal of Materials in Civil Engineering 2020, 32, 04020375 .
AMA StyleRan Zhang, Jie Ji, Zhanping You, Hainian Wang. Modification Mechanism of Using Waste Wood–Based Bio-Oil to Modify Petroleum Asphalt. Journal of Materials in Civil Engineering. 2020; 32 (12):04020375.
Chicago/Turabian StyleRan Zhang; Jie Ji; Zhanping You; Hainian Wang. 2020. "Modification Mechanism of Using Waste Wood–Based Bio-Oil to Modify Petroleum Asphalt." Journal of Materials in Civil Engineering 32, no. 12: 04020375.
The road pavement is a typical three-dimensional (3D) multilayered half-space medium, which consists of the surface courses, base courses, and soil subgrade/foundation. It is critical to understand the dynamic response of the road pavement under vehicular loads for improving structural design efficiency. The actual vehicular loads can be simulated as a harmonic moving load. In general, there are several methods to analyze the dynamic response of the multilayered half-space medium under harmonic moving loads, such as the boundary element method (BEM) and the finite-element method (FEM). However, the previously mentioned methods might face some unavoidable problems, for example, the numerical overflow, when the thickness of the medium is thicker, which causes the wrong result or long computing time. Therefore, the objective of this study is to develop a precise solution to solve the dynamic response of the 3D multilayered half-space medium under a harmonic moving load. In this study, a new type of 3D spectral element method (SEM) was developed and applied to the dynamic response analysis. Details of the mathematical derivation, implementation, and verification were demonstrated in the current paper. Subsequent numerical results, based on a layered road pavement structure constructed on a soil foundation, indicated that both the load speed and the frequency, the damping ratio of the structural materials, and the interlayer condition significantly impacted on the dynamic response of the structure under vehicular loads.
Lingyun You; Kezhen Yan; Jianhong Man; Tingwei Shi. 3D Spectral Element Solution of Multilayered Half-Space Medium with Harmonic Moving Load: Effect of Layer, Interlayer, and Loading Properties on Dynamic Response of Medium. International Journal of Geomechanics 2020, 20, 04020227 .
AMA StyleLingyun You, Kezhen Yan, Jianhong Man, Tingwei Shi. 3D Spectral Element Solution of Multilayered Half-Space Medium with Harmonic Moving Load: Effect of Layer, Interlayer, and Loading Properties on Dynamic Response of Medium. International Journal of Geomechanics. 2020; 20 (12):04020227.
Chicago/Turabian StyleLingyun You; Kezhen Yan; Jianhong Man; Tingwei Shi. 2020. "3D Spectral Element Solution of Multilayered Half-Space Medium with Harmonic Moving Load: Effect of Layer, Interlayer, and Loading Properties on Dynamic Response of Medium." International Journal of Geomechanics 20, no. 12: 04020227.
The authors wish to make the following correction to this paper
Chengdong Xia; Songtao Lv; Lingyun You; Dong Chen; Yipeng Li; Jianlong Zheng. Correction: Xia, C.; et al. Unified Strength Model of Asphalt Mixture under Various Loading Modes. Materials 2019, 12, 889. Materials 2020, 13, 5393 .
AMA StyleChengdong Xia, Songtao Lv, Lingyun You, Dong Chen, Yipeng Li, Jianlong Zheng. Correction: Xia, C.; et al. Unified Strength Model of Asphalt Mixture under Various Loading Modes. Materials 2019, 12, 889. Materials. 2020; 13 (23):5393.
Chicago/Turabian StyleChengdong Xia; Songtao Lv; Lingyun You; Dong Chen; Yipeng Li; Jianlong Zheng. 2020. "Correction: Xia, C.; et al. Unified Strength Model of Asphalt Mixture under Various Loading Modes. Materials 2019, 12, 889." Materials 13, no. 23: 5393.
The purpose of this study is to compare the performance of rubber-modified asphalt mixtures prepared with incorporation of latex and crumb rubber. The service characteristics of the rubber-modified asphalt mixtures were evaluated using workability index and compaction energy index to determine the ease of placing, handling, and compacting of the asphalt mixture. The engineering properties of the asphalt mixtures were also evaluated in terms of indirect tensile strength (ITS), resilient modulus, permanent deformation, moisture susceptibility, and the Leutner shear test. Crumb rubber and latex were separately used as modifiers in this study. The percentage of crumb rubber and latex used were 5% and 10%, while organo silane additive was added at a rate of 0.1%, all by the weight of asphalt binder. Through the evaluation, the modified asphalt mixture required comparable energy for compaction through the assessment of compaction energy index (CEI) as compared to the control asphalt mixture. Based on the results of performance test, it can be concluded that the crumb rubber-modified asphalt mixture showed a better performance than the latex-modified asphalt mixture in terms of fracture resistance, permanent deformation, resilient modulus, shear resistance, and moisture resistance. Overall, the rubberised asphalt mixture has better engineering performance properties that can prolong the lifespan of the flexible pavement compared to the conventional asphalt mixture.
Sharvin Poovaneshvaran; Lim Wee Zheng; Mohd Rosli Mohd Hasan; Xu Yang; Aboelkasim Diab. Workability, compactibility and engineering properties of rubber-modified asphalt mixtures prepared via wet process. International Journal of Pavement Research and Technology 2020, 14, 560 -569.
AMA StyleSharvin Poovaneshvaran, Lim Wee Zheng, Mohd Rosli Mohd Hasan, Xu Yang, Aboelkasim Diab. Workability, compactibility and engineering properties of rubber-modified asphalt mixtures prepared via wet process. International Journal of Pavement Research and Technology. 2020; 14 (5):560-569.
Chicago/Turabian StyleSharvin Poovaneshvaran; Lim Wee Zheng; Mohd Rosli Mohd Hasan; Xu Yang; Aboelkasim Diab. 2020. "Workability, compactibility and engineering properties of rubber-modified asphalt mixtures prepared via wet process." International Journal of Pavement Research and Technology 14, no. 5: 560-569.
Thermoplastic polyurethane elastomers (TPUs) are widely used in a variety of applications as a result of flexible and superior performance. However, few scholars pay close attention on the design and synthesis of TPUs through the self-determined laboratory process, especially on definite of chemical structures and upon the influence on properties. To investigate the properties of synthesized modifier based on chemical structure, firstly each kind of unknown structure and composition ratio of TPUs was determined by using a new method. Furthermore, the thermal characteristics and mechanical properties of modifiers were exposed by thermal characteristics and mechanics performance tests. The experimental results indicate that TPUs for use as an asphalt modifier can successfully be synthesized with the aid of semi-prepolymer method. The linear backbone structure of TPUs with different hard segment contents were determined by micro test methods. The polyester-based TPUs had thermal behavior better than the polyether-based TPUs; conversely, the low temperature performance of polyether-based TPUs was superior. Most importantly, it was found that the relative molecular mass of TPUs exhibited a weak effect on the mechanical properties, whereas the crystallinity of hard segment showed a significant influence on the properties of TPUs.
Xin Jin; Naisheng Guo; Zhanping You; Yiqiu Tan. Design and Performance of Polyurethane Elastomers Composed with Different Soft Segments. Materials 2020, 13, 4991 .
AMA StyleXin Jin, Naisheng Guo, Zhanping You, Yiqiu Tan. Design and Performance of Polyurethane Elastomers Composed with Different Soft Segments. Materials. 2020; 13 (21):4991.
Chicago/Turabian StyleXin Jin; Naisheng Guo; Zhanping You; Yiqiu Tan. 2020. "Design and Performance of Polyurethane Elastomers Composed with Different Soft Segments." Materials 13, no. 21: 4991.