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The aging resistance of asphalt mixture has an important impact on the long-term quality and service life of asphalt pavements. This research aims at studying the effects of long-term aging on waste tire rubber (WTR) and amorphous poly alpha olefin (APAO) modified asphalt binder and mixtures. The prepared compounds included, 12%WTR + 4%APAO and 15%WTR + 4%APAO modified asphalts, were used as experimental objects. Base asphalt binder (70 penetration grade), 15%WTR modified asphalt and styrene–butadiene-styrene (SBS) modified asphalt were the reference objects. First, pressure aging vessel (PAV) and long-term oven aging (LTOA) were used to simulate the long-term aging of asphalt binder and mixture, respectively. Secondly, the performance tests of asphalt binder and mixture were carried out, and the evaluation indexes of the effects of long-term aging on performance were proposed. For the asphalt binder, the results show that the incorporation of WTR and APAO significantly improves the post-aging conventional properties, rheological properties and fatigue properties. The Fourier transform infrared spectroscopy (FTIR) results were found to correlate to the physical tests results. In the asphalt mixture part, the results show that 15%WTR + 4%APAO modified mixture has better high temperature and fatigue performance after aging, among the rubber-based asphalt mixtures. The low-temperature performance of WTR/APAO asphalt mixture was not compromised after aging. Compared with the SBS modified asphalt mixture, the high and low-temperature performance of 15%WTR + 4%APAO asphalt mixture after aging are better. Overall, 15%WTR+4% APAO asphalt mixture has better advantages to counteract the influence of oxidative aging.
Shaoquan Wang; Ying Gao; Kezhen Yan; Lingyun You; Yanshun Jia; Xiongwei Dai; Ming Chen; Aboelkasim Diab. Effect of long-term aging on waste tire rubber and amorphous poly alpha olefin compound modified asphalt binder and its mixtures. Construction and Building Materials 2020, 272, 121667 .
AMA StyleShaoquan Wang, Ying Gao, Kezhen Yan, Lingyun You, Yanshun Jia, Xiongwei Dai, Ming Chen, Aboelkasim Diab. Effect of long-term aging on waste tire rubber and amorphous poly alpha olefin compound modified asphalt binder and its mixtures. Construction and Building Materials. 2020; 272 ():121667.
Chicago/Turabian StyleShaoquan Wang; Ying Gao; Kezhen Yan; Lingyun You; Yanshun Jia; Xiongwei Dai; Ming Chen; Aboelkasim Diab. 2020. "Effect of long-term aging on waste tire rubber and amorphous poly alpha olefin compound modified asphalt binder and its mixtures." Construction and Building Materials 272, no. : 121667.
Laboratory evaluation of elastomer- and plastomer-modified asphalt binders using different grades of asphalt binders and produced asphalt concrete mixes is the subject of this paper. The evaluated polymer modifiers in this study were an elastomer [commercially available styrene-butadiene-styrene (SBS) and a plastomer (functionally modified olefin commercially known as Eastman EE-2)], blended separately with two penetration-grade binders (60/70 and 80/100) at polymer/binder ratios of 2%, 4%, and 6% (by mass). The rheological properties of the polymer-modified binders (PMBs) were tested using a rotational viscometer, dynamic shear rheometer, and bending beam rheometer. The effect of the polymers on the rheological properties of the asphalt binders was investigated before and following standardized short- and long-term oxidative aging. Hot-mix asphalt mixes were prepared and evaluated in terms of the number of performance tests, which included indirect tensile strength, moisture susceptibility, resilient modulus, creep-recovery strain properties, and indirect tension fatigue. Analysis of the obtained PMBs indicated that the addition of the elastomer and plastomer polymers to petroleum asphalts was very useful in obtaining a number of desirable characteristics. The main indicators of such improvements are improved rutting resistance of the unaged and short-term aged binders, and the addition of higher percentages of the polymers resulted in an upward shift of the rutting resistance without impacting the fatigue properties of the binders. The addition of up to 6% of the polymers to the binders raised the performance grade (PG) of the PMBs by at least two grades from their base PG. For the softer binder (i.e., Pen. 80/100), 6% SBS pumped the PG of the binder three grades up. The introduction of varying amounts of elastomer and plastomer polymers can significantly influence the resultant mechanistic properties of mixtures.
Mahmoud Enieb; Lina Shbeeb; Ibrahim Asi; Xu Yang; Aboelkasim Diab. Effect of Asphalt Grade and Polymer Type (SBS and EE-2) on Produced PMB and Asphalt Concrete Mix Properties. Journal of Materials in Civil Engineering 2020, 32, 04020385 .
AMA StyleMahmoud Enieb, Lina Shbeeb, Ibrahim Asi, Xu Yang, Aboelkasim Diab. Effect of Asphalt Grade and Polymer Type (SBS and EE-2) on Produced PMB and Asphalt Concrete Mix Properties. Journal of Materials in Civil Engineering. 2020; 32 (12):04020385.
Chicago/Turabian StyleMahmoud Enieb; Lina Shbeeb; Ibrahim Asi; Xu Yang; Aboelkasim Diab. 2020. "Effect of Asphalt Grade and Polymer Type (SBS and EE-2) on Produced PMB and Asphalt Concrete Mix Properties." Journal of Materials in Civil Engineering 32, no. 12: 04020385.
To understand the prospects of rubber-modified and polymer-modified asphaltic materials, pavement engineers must have a proper knowledge of the physical mechanisms of polymer materials in asphalt binder so that asphalt materials reflect the various rheological properties and pavement distresses along the wide range of testing conditions. Accordingly, the study reported here is aimed to present a mechanistic investigation on characteristics of rubber-modified and polymer-modified asphalt binders based on the evaluation of various rheological properties and primary modes of failure (i.e. low-temperature cracking, rutting and fatigue cracking in this study). In this experimental work, crumb rubber (hereinafter referred to as rubber), styrene–butadiene styrene (SBS), and ethylene–vinyl acetate (EVA), were introduced individually to the asphalt binder at different rates to prepare the blends. The physical and mechanical characteristics of the modified asphalt binders were discussed in the light of rotational viscosity (before and after aging), linear and nonlinear rheological measurements, rutting susceptibility, fatigue cracking, and relaxation modulus. Susceptibility to low-temperature cracking also was analyzed for all possible aging states. The results revealed that the viscosity of modified asphalt binders (using rubber, SBS, and EVA) is highly dependent on the aging state and the additive type and the content. The modified binders are able to allow good stress relaxation and better resistance to low-temperature cracking (even after short- and long-term aging), rutting, and fatigue cracking. Interestingly, the low-temperature cracking performance of the SBS-modified asphalt binder had improved much more after long-term aging compared to the unmodified binder and rubber/EVA modified binders. EVA-modified binder can sustain higher strains than rubber-modified binder (RMB), while comparing both small and large shear strain measurements. Storage and viscous moduli were determined to identify the rheological properties along the range of linear and nonlinear domains, and polymer-modified binders (PMBs) showed higher moduli in linear and nonlinear rheological conditions compared to the unmodified binder. Likely, higher cross-linking generated by polymer is the main contributory cause of such result. EVA polymer is a good choice to mitigate rutting, whereas SBS is more helpful to control fatigue cracking of the binders.
Aboelkasim Diab; Zhanping You; Sanjeev Adhikari; Lingyun You; Xuelian Li; Mohamed El-Shafie. Investigating the mechanisms of rubber, styrene-butadiene-styrene and ethylene-vinyl acetate in asphalt binder based on rheological and distress-related tests. Construction and Building Materials 2020, 262, 120744 .
AMA StyleAboelkasim Diab, Zhanping You, Sanjeev Adhikari, Lingyun You, Xuelian Li, Mohamed El-Shafie. Investigating the mechanisms of rubber, styrene-butadiene-styrene and ethylene-vinyl acetate in asphalt binder based on rheological and distress-related tests. Construction and Building Materials. 2020; 262 ():120744.
Chicago/Turabian StyleAboelkasim Diab; Zhanping You; Sanjeev Adhikari; Lingyun You; Xuelian Li; Mohamed El-Shafie. 2020. "Investigating the mechanisms of rubber, styrene-butadiene-styrene and ethylene-vinyl acetate in asphalt binder based on rheological and distress-related tests." Construction and Building Materials 262, no. : 120744.
Xu Yang; Zhanping You; Jacob E. Hiller; Mohd Rosli Mohd Hasan; Aboelkasim Diab; Sang Luo. Sensitivity of Rigid Pavement Performance Predictions to Individual Climate Variables using Pavement ME Design. Journal of Transportation Engineering, Part B: Pavements 2020, 146, 04020028 .
AMA StyleXu Yang, Zhanping You, Jacob E. Hiller, Mohd Rosli Mohd Hasan, Aboelkasim Diab, Sang Luo. Sensitivity of Rigid Pavement Performance Predictions to Individual Climate Variables using Pavement ME Design. Journal of Transportation Engineering, Part B: Pavements. 2020; 146 (3):04020028.
Chicago/Turabian StyleXu Yang; Zhanping You; Jacob E. Hiller; Mohd Rosli Mohd Hasan; Aboelkasim Diab; Sang Luo. 2020. "Sensitivity of Rigid Pavement Performance Predictions to Individual Climate Variables using Pavement ME Design." Journal of Transportation Engineering, Part B: Pavements 146, no. 3: 04020028.
The paper at hand focuses on modeling the stress response of different mastics and asphalt binders exposed to small and large shear strains using Bergström-Boyce (BB) constitutive model as well as Finite Element (FE) approach. In this paper, a set of experiments based on Large Amplitude Oscillatory Shear (LAOS) test were designed and conducted to capture the state of strain dependence of bituminous mastics and binders over a broad spectrum of strain domain (0.5%, 10%, 20%, 30%, and 40%) pertaining linear and nonlinear regimes of such materials. Using the experimental data, the BB constitutive model was utilized to describe the attained behavior at two temperatures (30 °C and 40 °C) and varied strain amplitudes. The material properties derived from the BB model were further implemented into a Finite Element Model (FEM) using the ABAQUS platform to simulate the stress response of bituminous materials for a wide range of strain amplitudes. It has been shown that the bituminous mastics and binders have strong nonlinearity at high strain amplitudes, depicted graphically based on the progressive distortion from the elliptical form of Lissajous-Bowditch (LB) plot. Based on the observed goodness of fitting, the BB model well-described the experimental results for linear and nonlinear behaviors. Using the optimized parameters, it was confirmed that the BB model is well suited to build a numerical model that could reproduce stress responses derived from the LAOS results for a wide range of strain levels. The advantage of the methodology presented herein allows adaptable model constants of the BB model depending on the imposed level of strain and temperature and hence, the FEM can describe both linear and nonlinear behaviors of bituminous mastics and binders. From this paper, researchers can take advantage of capturing the stress response of binders and mastics under small and large strain amplitudes to stimulate the research on better representation of the complex behavior of asphalt mixes based on the role of mastic and asphalt binder.
Aboelkasim Diab; Zhanping You; Sanjeev Adhikari; Xuelian Li. Modeling shear stress response of bituminous materials under small and large strains. Construction and Building Materials 2020, 252, 119133 .
AMA StyleAboelkasim Diab, Zhanping You, Sanjeev Adhikari, Xuelian Li. Modeling shear stress response of bituminous materials under small and large strains. Construction and Building Materials. 2020; 252 ():119133.
Chicago/Turabian StyleAboelkasim Diab; Zhanping You; Sanjeev Adhikari; Xuelian Li. 2020. "Modeling shear stress response of bituminous materials under small and large strains." Construction and Building Materials 252, no. : 119133.
The objective of this study was to investigate the rheological and chemical properties of crumb rubber modified asphalt binder. Reacted and activated rubber (RAR) with different rubber contents were used to modify the asphalt binder, including 15%, 25%, 30%, 35% and 40% by mass of RAR modified asphalt binder. In general, the test results were favourable in rutting resistance performance, fatigue cracking resistance and low-temperature cracking resistance. The addition of RAR led to an improvement of elastic properties and a decrease in viscous features of the binders. The RAR behaved as an anti-cracking additive to increase the service life of asphalt pavements. At a strain level of 5.0%, the binder fatigue life of 15% RAR, 25% RAR, 30% RAR, 35% RAR, 40% RAR and 12% Terminal Blend were 13, 24, 30, 43, 45 and 18 times higher than that of the control binder, respectively. The absorbance growth height increased with increasing amounts of RAR additives in the Fourier Transform Infrared Spectroscopy spectra. A linear correlation was found between the RAR content of the binder and the area under the band at 3642 cm−1 and the ratio of the bands at 3642 and 1376 cm−1.
Siyu Chen; Dongdong Ge; Fangyuan Gong; Zhanping You; Aboelkasim Diab; Mingxiao Ye. Rheological properties and chemical characterisation of reacted and activated rubber modified asphalt binder. Road Materials and Pavement Design 2020, 21, S140 -S154.
AMA StyleSiyu Chen, Dongdong Ge, Fangyuan Gong, Zhanping You, Aboelkasim Diab, Mingxiao Ye. Rheological properties and chemical characterisation of reacted and activated rubber modified asphalt binder. Road Materials and Pavement Design. 2020; 21 (sup1):S140-S154.
Chicago/Turabian StyleSiyu Chen; Dongdong Ge; Fangyuan Gong; Zhanping You; Aboelkasim Diab; Mingxiao Ye. 2020. "Rheological properties and chemical characterisation of reacted and activated rubber modified asphalt binder." Road Materials and Pavement Design 21, no. sup1: S140-S154.
The concrete transportation infrastructures will undergo both fatigue traffic loading and environmental impacts during the whole service life, including rigid pavements, bridges decks, airfield runways, railway bridges, even high-speed railways and concrete structures in the ocean. This study aims to investigate the effects of external sulfate attack on concrete under flexural fatigue loading and drying-wetting cycles. The changes of mass loss rate and relative dynamic elastic modulus were measured to indicate the influence of the coupled effects on the integrity and mechanical performance of concrete, also the sulfate content inside concrete was determined to indicate the permeability of sulfate ion under different experimental conditions. Moreover, the phase composition of samples was analyzed using X-ray diffraction (XRD). In addition, the effect of fly ash on sulfate attack was duly studied. Fatigue loading causes cracking in the interfaces of various phases and forms cracks in the concrete. Within the influence depth of drying-wetting cycles, concrete is subjected to both water convection due to capillary action and diffusion due to concentration gradients. The results indicate the fatigue loading and drying-wetting cycles can accelerate the transportation of sulfate ion inside concrete and the deterioration degree of concrete subjected to sulfate. The findings in this study can help to understand the influence of fatigue loading and drying-wetting cycles on the development of sulfate attack.
Fang Liu; Zhanping You; Aboelkasim Diab; Zhuangzhuang Liu; Chao Zhang; Shuaicheng Guo. External sulfate attack on concrete under combined effects of flexural fatigue loading and drying-wetting cycles. Construction and Building Materials 2020, 249, 118224 .
AMA StyleFang Liu, Zhanping You, Aboelkasim Diab, Zhuangzhuang Liu, Chao Zhang, Shuaicheng Guo. External sulfate attack on concrete under combined effects of flexural fatigue loading and drying-wetting cycles. Construction and Building Materials. 2020; 249 ():118224.
Chicago/Turabian StyleFang Liu; Zhanping You; Aboelkasim Diab; Zhuangzhuang Liu; Chao Zhang; Shuaicheng Guo. 2020. "External sulfate attack on concrete under combined effects of flexural fatigue loading and drying-wetting cycles." Construction and Building Materials 249, no. : 118224.
Hot in-place recycling (HIR) allows 100% reuse of reclaimed asphalt pavement (RAP) directly on a construction site. However, the homogeneity of the HIR is difficult to be evaluated due to the complexity of the material composition and construction process. In this study, in view of the homogeneity of the HIR can be reflected by the mixing quality of virgin and RAP aggregates, the homogeneity of virgin and RAP aggregates was investigated. Firstly, the Marshall test specimens of an HIR asphalt mixture were prepared and saw-cut, and the microstructure of each cross section was extracted using digital image processing (DIP) technique, including image enhancement, iterative threshold segmentation and maximum between-class variance (OTSU threshold), retention of the green channel, and image morphology. Then, each cross section of the specimen was divided into 36 regions of equal area by an annular segmentation with sector segmentation. Based on the coefficient of variation in the area ratio of the virgin aggregate to RAP aggregate, a homogeneity coefficient of HIR asphalt mixture was proposed. Another nine groups of Marshall specimens were prepared and cut, and the homogeneity coefficient of each group was calculated. The results showed that the virgin and RAP aggregates in the cross section could be effectively identified due to different gray values by retaining the green channel. The characteristics of the virgin and RAP aggregates could be comprehensively described using annular segmentation combined with sector segmentation. The related macro qualitative test showed that the aggregate in the asphalt mixture could be accurately extracted by the threshold segmentation method based on annular segmentation combined with the OTSU method. The homogeneity could be accurately and quantitatively evaluated by a homogeneity coefficient based on the area ratio of the virgin and RAP aggregates in each cross section. An improvement in the homogeneity of the virgin and RAP aggregates was achieved with an increase in the heating temperature of RAP and mixing time. However, no further improvement was noticed as the heating temperature and mixing time increased. In short, the quantitative homogeneity evaluation index of virgin and RAP aggregates presented in this study, reflecting the homogeneity of HIR asphalt mixture, is helpful for controlling the quality of the HIR asphalt pavement.
Xuelian Li; Xinchao Lv; Yuhao Zhou; Zhanping You; Yuliang Chen; Zhijing Cui; Aboelkasim Diab. Homogeneity evaluation of hot in-place recycling asphalt mixture using digital image processing technique. Journal of Cleaner Production 2020, 258, 120524 .
AMA StyleXuelian Li, Xinchao Lv, Yuhao Zhou, Zhanping You, Yuliang Chen, Zhijing Cui, Aboelkasim Diab. Homogeneity evaluation of hot in-place recycling asphalt mixture using digital image processing technique. Journal of Cleaner Production. 2020; 258 ():120524.
Chicago/Turabian StyleXuelian Li; Xinchao Lv; Yuhao Zhou; Zhanping You; Yuliang Chen; Zhijing Cui; Aboelkasim Diab. 2020. "Homogeneity evaluation of hot in-place recycling asphalt mixture using digital image processing technique." Journal of Cleaner Production 258, no. : 120524.
This paper is aimed at providing a comprehensive experimental work on the viscosity behavior of different modified asphalt binders and mastics, as well as exploring mathematical representations of the results in attempts to predict the viscosity and flow behaviors according to Vinogradov-Malkin and Phillips-Deutsch models. The modified asphalt binders were prepared in the unaged and aged states using styrene-butadienestyrene (SBS), ethylene-vinyl acetate (EVA), and crumb rubber (CR); while the hydrated lime (HL) and fly ash (FA) were selected to produce the binder-filler mastics. To widen the study findings, the additives (polymers, rubber, and fillers) were applied at different possible levels of modification. To prepare the aged bituminous materials, the rolling thin-film oven (RTFO) was utilized for the short-term aging, while the pressure aging vessel (PAV) was further used to induce the possible long-term aging of same materials. Binders and binder-filler mastics were tested using a bob and cup geometry. The viscosity behavior was investigated under various effects of testing conditions including ranges of shear rates and temperatures. It was found that the effect of shear rate dominates and therefore the non-Newtonian shear thinning prevails at low temperatures particularly for binders containing high concentrations of additives. Even the base asphalt binder exhibits shear thinning behavior after a certain limit of shear rate. Based on the studied 38 curves, in general, Vinogradov-Malkin and Phillips-Deutsch models were found in a good agreement with the corresponding measurements especially the latter.
Aboelkasim Diab; Zhanping You; Xuelian Li; Jorge Carvalho Pais; Xu Yang; Siyu Chen. Rheological models for non-newtonian viscosity of modified asphalt binders and mastics. Egyptian Journal of Petroleum 2019, 29, 105 -112.
AMA StyleAboelkasim Diab, Zhanping You, Xuelian Li, Jorge Carvalho Pais, Xu Yang, Siyu Chen. Rheological models for non-newtonian viscosity of modified asphalt binders and mastics. Egyptian Journal of Petroleum. 2019; 29 (2):105-112.
Chicago/Turabian StyleAboelkasim Diab; Zhanping You; Xuelian Li; Jorge Carvalho Pais; Xu Yang; Siyu Chen. 2019. "Rheological models for non-newtonian viscosity of modified asphalt binders and mastics." Egyptian Journal of Petroleum 29, no. 2: 105-112.
Jie Ji; Zhe Wang; Hui Yao; Di Wang; Ran Zhang; Aboelkasim Diab; Qingli Dai. A numerical study on rutting behaviour of direct coal liquefaction residue modified asphalt mixture. Road Materials and Pavement Design 2019, 22, 1454 -1468.
AMA StyleJie Ji, Zhe Wang, Hui Yao, Di Wang, Ran Zhang, Aboelkasim Diab, Qingli Dai. A numerical study on rutting behaviour of direct coal liquefaction residue modified asphalt mixture. Road Materials and Pavement Design. 2019; 22 (6):1454-1468.
Chicago/Turabian StyleJie Ji; Zhe Wang; Hui Yao; Di Wang; Ran Zhang; Aboelkasim Diab; Qingli Dai. 2019. "A numerical study on rutting behaviour of direct coal liquefaction residue modified asphalt mixture." Road Materials and Pavement Design 22, no. 6: 1454-1468.
Siyu Chen; Dongdong Ge; Zhanping You; Aboelkasim Diab. Rheological Characteristics of Reacted and Activated Rubber Modified Asphalt Binder. Airfield and Highway Pavements 2019 2019, 1 .
AMA StyleSiyu Chen, Dongdong Ge, Zhanping You, Aboelkasim Diab. Rheological Characteristics of Reacted and Activated Rubber Modified Asphalt Binder. Airfield and Highway Pavements 2019. 2019; ():1.
Chicago/Turabian StyleSiyu Chen; Dongdong Ge; Zhanping You; Aboelkasim Diab. 2019. "Rheological Characteristics of Reacted and Activated Rubber Modified Asphalt Binder." Airfield and Highway Pavements 2019 , no. : 1.
Aboelkasim Diab; Zhanping You. Closure to “Linear and Nonlinear Rheological Properties of Bituminous Mastics under Large Amplitude Oscillatory Shear Testing” by Aboelkasim Diab and Zhanping You. Journal of Materials in Civil Engineering 2019, 31, 07019002 .
AMA StyleAboelkasim Diab, Zhanping You. Closure to “Linear and Nonlinear Rheological Properties of Bituminous Mastics under Large Amplitude Oscillatory Shear Testing” by Aboelkasim Diab and Zhanping You. Journal of Materials in Civil Engineering. 2019; 31 (4):07019002.
Chicago/Turabian StyleAboelkasim Diab; Zhanping You. 2019. "Closure to “Linear and Nonlinear Rheological Properties of Bituminous Mastics under Large Amplitude Oscillatory Shear Testing” by Aboelkasim Diab and Zhanping You." Journal of Materials in Civil Engineering 31, no. 4: 07019002.
Mahmoud Enieb; Aboelkasim Diab; Xu Yang. Short- and long-term properties of glass fiber reinforced asphalt mixtures. International Journal of Pavement Engineering 2019, 22, 64 -76.
AMA StyleMahmoud Enieb, Aboelkasim Diab, Xu Yang. Short- and long-term properties of glass fiber reinforced asphalt mixtures. International Journal of Pavement Engineering. 2019; 22 (1):64-76.
Chicago/Turabian StyleMahmoud Enieb; Aboelkasim Diab; Xu Yang. 2019. "Short- and long-term properties of glass fiber reinforced asphalt mixtures." International Journal of Pavement Engineering 22, no. 1: 64-76.
Although the use of polymeric additives has been widely accepted as a promising strategy to improve broad spectrum of pavement deficiencies, aging-induced mechanisms of polymer-modified asphalt binders and mixtures still have critical aspects that should be studied to a comprehensive extent. The primary objective of this paper is to advance the understanding of aging effect on the properties of polymer-modified asphalt binders and mixtures. In this study, six different polymeric products were of specific interest: styrene-butadiene-styrene (SBS), polypropylene (PP), styrene-acrylonitrile (SAN), high-density polyethylene (HDPE), polycarbonate (PC), and acrylonitrile-butadiene-styrene (ABS), each was applied at rates of 2% and 5% (by the wt. of asphalt binder) to prepare polymer-modified binders and mixtures. The prepared binders passed thin film oven test (TFOT), while the mixtures were subjected to normal and 16 h production aging. The compositional analysis of asphalt binders was discussed based on the elemental analysis tests while the penetration, ring and ball, and rotational viscosity tests were further studied to evaluate the physical properties. The asphalt mixtures were evaluated based on a series of engineering performance-based properties using indirect tensile strength (ITS), moisture susceptibility, uniaxial static creep-recovery, resilient modulus, and diametral fatigue tests. The fatigue tests were conducted without and with rest period so as to provide insight into the healing potential of different modified mixtures. The results showed that the aging increased the carbon component in all blends; however mixed results were attained regarding hydrogen, sulphur, and nitrogen. No obvious trends were ascertained for carbon, hydrogen, nitrogen, and sulphur due to polymer modification. Aging induced effects on polymer-modified binders and mixtures are highly dependent on the polymer type and modification level. Polymer modification had positive influence on ITS, creep strain and recovery ratio, resilient modulus, resistance to moisture damage, and fatigue life. Fatigue tests with rest period proved that the polymer-modified mixtures have higher tendency to heal compared to the unmodified mixtures, which resulted in an improvement in the fatigue performance of the mixtures. Except for the fatigue life, the aging of polymer-modified asphalt mixtures had no detrimental effect on the studied mechanistic properties.
Aboelkasim Diab; Mahmoud Enieb; Dharamveer Singh. Influence of aging on properties of polymer-modified asphalt. Construction and Building Materials 2018, 196, 54 -65.
AMA StyleAboelkasim Diab, Mahmoud Enieb, Dharamveer Singh. Influence of aging on properties of polymer-modified asphalt. Construction and Building Materials. 2018; 196 ():54-65.
Chicago/Turabian StyleAboelkasim Diab; Mahmoud Enieb; Dharamveer Singh. 2018. "Influence of aging on properties of polymer-modified asphalt." Construction and Building Materials 196, no. : 54-65.
The reconstruction of microstructural models is the prerequisite step for the micromechanical simulation of asphalt concrete. Computer-generated microstructural models have been developed because the traditional X-ray image-based models are costly and time-consuming. One concern for the computer-generated model is the accuracy in aggregate morphology and internal structure compared with the X-ray image-based models. Therefore, it is desirable to generate microstructural models with aggregate morphology and internal structures close to the real asphalt concrete samples. Although aggregate morphology and internal structures for real samples have been previously studied, these parameters for computer-generated models are rarely reported. This study aims to propose an approach to analyze and quantify the aggregate morphology and internal structures of computer-generated microstructural models of asphalt concrete. Sphere clumps were used to represent aggregate particles and air voids. Then the aggregate skeleton and air voids were generated based on which both discrete element (DE) models and finite-element models on the microscale can be reconstructed. The aggregate sphericity and angularity, air void distribution, aggregate orientation, aggregate contact points, and aggregate distribution were analyzed based on the DE model. Some novel approaches were proposed to quantify these parameters. The results showed that all these parameters can be successfully obtained and quantified. The outcomes of this study can serve as a prestep of the ultimate goal of reconstructing microstructural models that display aggregate morphology and an internal structure comparable to real asphalt concrete samples.
Xu Yang; Zhanping You; Can Jin; Aboelkasim Diab; Mohd Rosli Mohd Hasan. Aggregate Morphology and Internal Structure for Asphalt Concrete: Prestep of Computer-Generated Microstructural Models. International Journal of Geomechanics 2018, 18, 06018024 .
AMA StyleXu Yang, Zhanping You, Can Jin, Aboelkasim Diab, Mohd Rosli Mohd Hasan. Aggregate Morphology and Internal Structure for Asphalt Concrete: Prestep of Computer-Generated Microstructural Models. International Journal of Geomechanics. 2018; 18 (10):06018024.
Chicago/Turabian StyleXu Yang; Zhanping You; Can Jin; Aboelkasim Diab; Mohd Rosli Mohd Hasan. 2018. "Aggregate Morphology and Internal Structure for Asphalt Concrete: Prestep of Computer-Generated Microstructural Models." International Journal of Geomechanics 18, no. 10: 06018024.
The objective of this article is to investigate the effects of temperature on rutting and fatigue cracking resistance of asphalt binders based on the time-temperature superposition principle (TTSP). In this study, the TTSP approach was employed to interpret the results of multiple stress creep recovery (MSCR) and linear amplitude sweep (LAS) tests for both neat and styrene-butadiene-styrene (SBS)–modified asphalt binders. The higher stress level of 3.2 kPa in the standard MSCR test procedure was extended to 10 and 15 kPa to verify the stress sensitivity of the nonrecoverable compliance (Jnr). A loading duration of 5 minutes in the standard LAS test was extended to 10 and 15 minutes to develop the fatigue failure criterion at different conditions. The results demonstrate that the time-strain curves of the neat binder during the MSCR tests under different temperatures can be unified into a single strain master curve using the TTSP shift factors, based on which the predictive Jnr showed good agreement with the measured values. This TTSP-based analysis approach does not work well for the MSCR results of the SBS-modified binder at high temperatures. However, the fatigue failure criterion determined from the LAS tests under different temperatures was verified to be successfully constructed into a single failure criterion according to the TTSP approach for both the neat and SBS-modified binders. Therefore, only an additional caution is raised for the TTS-based analysis on rutting resistance of the modified binder in a high temperature range.
Chao Wang; Yang Wang; Yangzhou Chen; Aboelkasim Diab; Zhanping You. Characterizing the Temperature Effects on Rutting and Fatigue Properties of Asphalt Binders Based on Time-Temperature Superposition Principle. Journal of Testing and Evaluation 2018, 47, 1 .
AMA StyleChao Wang, Yang Wang, Yangzhou Chen, Aboelkasim Diab, Zhanping You. Characterizing the Temperature Effects on Rutting and Fatigue Properties of Asphalt Binders Based on Time-Temperature Superposition Principle. Journal of Testing and Evaluation. 2018; 47 (4):1.
Chicago/Turabian StyleChao Wang; Yang Wang; Yangzhou Chen; Aboelkasim Diab; Zhanping You. 2018. "Characterizing the Temperature Effects on Rutting and Fatigue Properties of Asphalt Binders Based on Time-Temperature Superposition Principle." Journal of Testing and Evaluation 47, no. 4: 1.
This paper is intended to highlight applications of electronic-waste plastics in the asphalt modification in an environmental friendly manner. Successful approaches for integrating e-waste plastics into asphalt pavement requires modification of the plastic. Results from previous and ongoing research efforts have shown that the use of e-waste plastics in asphalt pavement materials have improved various asphalt pavement properties such as resistance to permanent deformation and asphalt stability. Ongoing challenges for successful modification of e-waste plastics include, environmental issues concerning the disposal and its implementation are discussed in this paper. The application of e-waste plastics as a modifier in asphalt pavement is a promising way to remedy environmental hazards inherent within e-waste products. Overall, research efforts should focus on the development of efficient e-waste recycling procedures for industrial quantities of e-waste plastics in order to support sustainable development and a cleaner atmosphere.
Mohd Rosli Mohd Hasan; Baron W. Colbert; Zhanping You; Xu Yang; Meor Othman Hamzah; Qingli Dai; Hainian Wang; Aboelkasim Diab. A Review on Utilization of Electronic Waste Plastics for Use Within Asphaltic Concrete Materials: Development, Opportunities and Challenges for Successful Implementation. Encyclopedia of Renewable and Sustainable Materials 2018, 737 -749.
AMA StyleMohd Rosli Mohd Hasan, Baron W. Colbert, Zhanping You, Xu Yang, Meor Othman Hamzah, Qingli Dai, Hainian Wang, Aboelkasim Diab. A Review on Utilization of Electronic Waste Plastics for Use Within Asphaltic Concrete Materials: Development, Opportunities and Challenges for Successful Implementation. Encyclopedia of Renewable and Sustainable Materials. 2018; ():737-749.
Chicago/Turabian StyleMohd Rosli Mohd Hasan; Baron W. Colbert; Zhanping You; Xu Yang; Meor Othman Hamzah; Qingli Dai; Hainian Wang; Aboelkasim Diab. 2018. "A Review on Utilization of Electronic Waste Plastics for Use Within Asphaltic Concrete Materials: Development, Opportunities and Challenges for Successful Implementation." Encyclopedia of Renewable and Sustainable Materials , no. : 737-749.
Aboelkasim Diab; Mahmoud Enieb. Investigating influence of mineral filler at asphalt mixture and mastic scales. International Journal of Pavement Research and Technology 2018, 11, 213 -224.
AMA StyleAboelkasim Diab, Mahmoud Enieb. Investigating influence of mineral filler at asphalt mixture and mastic scales. International Journal of Pavement Research and Technology. 2018; 11 (3):213-224.
Chicago/Turabian StyleAboelkasim Diab; Mahmoud Enieb. 2018. "Investigating influence of mineral filler at asphalt mixture and mastic scales." International Journal of Pavement Research and Technology 11, no. 3: 213-224.
This paper studies the linear viscoelastic behavior under small strain amplitudes and the nonlinear behavior using large amplitude oscillatory shear (LAOS) tests performed at strains beyond the linear viscoelastic regime of bituminous mastics. Four types of mineral fillers—blast-furnace slag (BFS), silica fume (SF), fly ash (FA), and hydrated lime (HL)—with particle sizes less than 75 μm are used to prepare the asphalt mastics with proportions of 0.7 and 1.15 based on the mass of base binder. For the linear rheological measurements, small strain oscillatory shear testing is carried out within the linear regime of the materials. The nonlinear viscoelastic properties are investigated using the LAOS test performed at 40°C and 1 Hz to examine Lissajous-Bowditch plots and by analyzing the elastic and viscous nonlinearities of the mastics at strains of 0.5, 10, 20, 30, and 40%. The linear viscoelastic region (LVER) of the mastic and base binder depends not only on the strain amplitude but on the testing frequency and temperature as well. The filler type and concentration have an obvious influence on the linear viscoelastic properties of their mastics. The HL and SF fillers outperform the linear viscoelastic properties of the BFS and FA in terms of the complex shear modulus. The Lissajous-Bowditch plots become progressively distorted with the increase of strain amplitude and show an increase in the exerted stress with the addition of mineral fillers. The local nonlinear measures of an oscillatory LAOS cycle are able to quantitatively differentiate between the properties of studied mastics at different strain amplitudes. The mastic that shows the best performance in the linear regime is not guaranteed to perform superiorly in the nonlinear regime. The results can be used to differentiate or rank the properties of mastics and/or asphalt binders at different strain amplitudes in a quantitative manner.
Aboelkasim Diab; Zhanping You. Linear and Nonlinear Rheological Properties of Bituminous Mastics under Large Amplitude Oscillatory Shear Testing. Journal of Materials in Civil Engineering 2018, 30, 04017303 .
AMA StyleAboelkasim Diab, Zhanping You. Linear and Nonlinear Rheological Properties of Bituminous Mastics under Large Amplitude Oscillatory Shear Testing. Journal of Materials in Civil Engineering. 2018; 30 (3):04017303.
Chicago/Turabian StyleAboelkasim Diab; Zhanping You. 2018. "Linear and Nonlinear Rheological Properties of Bituminous Mastics under Large Amplitude Oscillatory Shear Testing." Journal of Materials in Civil Engineering 30, no. 3: 04017303.
Zhanping You; Meor Othman Hamzah; Hainian Wang; Aboelkasim Diab; Qingli Dai. Advanced Pavement Materials for Sustainable Transportation Infrastructure. Advances in Materials Science and Engineering 2018, 2018, 1 -1.
AMA StyleZhanping You, Meor Othman Hamzah, Hainian Wang, Aboelkasim Diab, Qingli Dai. Advanced Pavement Materials for Sustainable Transportation Infrastructure. Advances in Materials Science and Engineering. 2018; 2018 ():1-1.
Chicago/Turabian StyleZhanping You; Meor Othman Hamzah; Hainian Wang; Aboelkasim Diab; Qingli Dai. 2018. "Advanced Pavement Materials for Sustainable Transportation Infrastructure." Advances in Materials Science and Engineering 2018, no. : 1-1.