The Experts below are selected from a list of 1764 Experts worldwide ranked by ideXlab platform
Quan Lv - One of the best experts on this subject based on the ideXlab platform.
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investigation of critical factors determining the accuracy of binder bond strength test to evaluate adhesion properties of Asphalt binders
Journal of Testing and Evaluation, 2017Co-Authors: Weidong Huang, Quan LvAbstract:The bond strength between Asphalt and aggregates is a crucial parameter in evaluating the ability of Asphalt mixture resistance to moisture-induced damage. Factors affecting the bond strength were investigated based on the binder bond strength (BBS) test. The effects of Asphalt Film thickness and loading rate on the results of the BBS test and the relationship between these two factors were further studied. Then, specimens were subjected to four moisture conditions to study the impact of water on the bond strength. Furthermore, the impact of the complex modulus on the bond strength was studied using the dynamic shear rheometer (DSR) test. Finally, the pull-off test results were compared with the findings obtained from the Hamburg wheel-tracking device (HWTD) test regarding the moisture sensitivity of mixtures under dry and wet conditions. Results indicate that the pull-off tensile strength (POTS) increased with an increase of the loading rate, whereas POTS decreased with the increase of the Film thickness. It was proved that an equivalent relationship between these two factors existed in the BBS test. It is interesting that the measured POTS values were basically equal when the loading curves of the same Asphalt overlap under different combinations of Film thickness and loading rate. Water had a significant impact on the bond strength, and the moisture condition in the early state was important in determining the moisture sensitivity of the mixtures. Furthermore, POTS increased with the complex modulus of Asphalt binder, whereas the phase angle of Asphalt determined the extent to which the Film thickness will affect the BBS test results. The comparison of the BBS and HWTD tests confirmed that the BBS test could address the mixture resistance to water damage.
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study on bond properties between rap aggregates and virgin Asphalt using binder bond strength test and fourier transform infrared spectroscopy
Construction and Building Materials, 2016Co-Authors: Weidong Huang, Quan LvAbstract:Abstract Since the aged Asphalt Film coating Reclaimed Asphalt Pavement (RAP) aggregates has prevented virgin Asphalt from directly attaching to the aggregates, the mechanism behavior developed between RAP aggregates and virgin Asphalt should be considered differently. In order to directly measure bond strength between RAP aggregate and virgin binder, the Binder Bond Strength (BBS) test was performed, and artificial coated RAP substrates were prepared employing an innovative coating treatment. The aged Asphalt Film thickness and the aging level of RAP substrate, combined with dry and wet curing conditions were assessed regarding to their impact on bond strength. Fourier Transform Infrared (FTIR) spectroscopy was also utilized to investigate the effect of Film thickness and aggregate type on aging properties. According to BBS test results, existence of aged Asphalt Film had positive effects on bond properties under dry conditions. Moisture weakened this enhancement and induced more debond at the diffusion zone where the aged Film and virgin Asphalt blend. A proper aging level may exist at which RAP can provide optimum bond properties. Moreover, through FTIR spectroscopy, a good correlation between oxidation and Film thickness was observed.
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investigation of using binder bond strength test to evaluate adhesion and self healing properties of modified Asphalt binders
Construction and Building Materials, 2016Co-Authors: Weidong Huang, Quan Lv, Feipeng XiaoAbstract:Abstract The bond strength between Asphalt and aggregates is a crucial parameter in evaluating the capability of a binder to resist moisture-induced damage. A novel binder bond strength (BBS) test was studied in this paper, and factors affecting the bond strength including pulling rate and Asphalt Film thickness were investigated to propose a reasonable test procedure. The results showed that there is an equivalent relation between the pulling rate and the Asphalt Film thickness. Besides, the influences of different additives on the adhesion and self-healing property of two types of Asphalt (neat Asphalt and SBS modified Asphalt) were investigated using this modified pull-off test. Results indicate that different additives including styrene–butadiene–styrene (SBS), polyethylene (PE), polyphosphoric acid (PPA), Gilsonite, bis-stearamide wax (EBS) and rubber processing oil had significant impacts on the adhesion and self-healing properties of neat Asphalt and SBS-modified Asphalt. The comparison between BBS and DSR tests revealed that the complex modulus of Asphalt had a dual effect on the BBS test results while the comparison of the BBS and Hamburg Wheel Tracking Device (HWTD) tests confirmed that the BBS test could address the mixture resistance to water damage.
Weidong Huang - One of the best experts on this subject based on the ideXlab platform.
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investigation of critical factors determining the accuracy of binder bond strength test to evaluate adhesion properties of Asphalt binders
Journal of Testing and Evaluation, 2017Co-Authors: Weidong Huang, Quan LvAbstract:The bond strength between Asphalt and aggregates is a crucial parameter in evaluating the ability of Asphalt mixture resistance to moisture-induced damage. Factors affecting the bond strength were investigated based on the binder bond strength (BBS) test. The effects of Asphalt Film thickness and loading rate on the results of the BBS test and the relationship between these two factors were further studied. Then, specimens were subjected to four moisture conditions to study the impact of water on the bond strength. Furthermore, the impact of the complex modulus on the bond strength was studied using the dynamic shear rheometer (DSR) test. Finally, the pull-off test results were compared with the findings obtained from the Hamburg wheel-tracking device (HWTD) test regarding the moisture sensitivity of mixtures under dry and wet conditions. Results indicate that the pull-off tensile strength (POTS) increased with an increase of the loading rate, whereas POTS decreased with the increase of the Film thickness. It was proved that an equivalent relationship between these two factors existed in the BBS test. It is interesting that the measured POTS values were basically equal when the loading curves of the same Asphalt overlap under different combinations of Film thickness and loading rate. Water had a significant impact on the bond strength, and the moisture condition in the early state was important in determining the moisture sensitivity of the mixtures. Furthermore, POTS increased with the complex modulus of Asphalt binder, whereas the phase angle of Asphalt determined the extent to which the Film thickness will affect the BBS test results. The comparison of the BBS and HWTD tests confirmed that the BBS test could address the mixture resistance to water damage.
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study on bond properties between rap aggregates and virgin Asphalt using binder bond strength test and fourier transform infrared spectroscopy
Construction and Building Materials, 2016Co-Authors: Weidong Huang, Quan LvAbstract:Abstract Since the aged Asphalt Film coating Reclaimed Asphalt Pavement (RAP) aggregates has prevented virgin Asphalt from directly attaching to the aggregates, the mechanism behavior developed between RAP aggregates and virgin Asphalt should be considered differently. In order to directly measure bond strength between RAP aggregate and virgin binder, the Binder Bond Strength (BBS) test was performed, and artificial coated RAP substrates were prepared employing an innovative coating treatment. The aged Asphalt Film thickness and the aging level of RAP substrate, combined with dry and wet curing conditions were assessed regarding to their impact on bond strength. Fourier Transform Infrared (FTIR) spectroscopy was also utilized to investigate the effect of Film thickness and aggregate type on aging properties. According to BBS test results, existence of aged Asphalt Film had positive effects on bond properties under dry conditions. Moisture weakened this enhancement and induced more debond at the diffusion zone where the aged Film and virgin Asphalt blend. A proper aging level may exist at which RAP can provide optimum bond properties. Moreover, through FTIR spectroscopy, a good correlation between oxidation and Film thickness was observed.
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investigation of using binder bond strength test to evaluate adhesion and self healing properties of modified Asphalt binders
Construction and Building Materials, 2016Co-Authors: Weidong Huang, Quan Lv, Feipeng XiaoAbstract:Abstract The bond strength between Asphalt and aggregates is a crucial parameter in evaluating the capability of a binder to resist moisture-induced damage. A novel binder bond strength (BBS) test was studied in this paper, and factors affecting the bond strength including pulling rate and Asphalt Film thickness were investigated to propose a reasonable test procedure. The results showed that there is an equivalent relation between the pulling rate and the Asphalt Film thickness. Besides, the influences of different additives on the adhesion and self-healing property of two types of Asphalt (neat Asphalt and SBS modified Asphalt) were investigated using this modified pull-off test. Results indicate that different additives including styrene–butadiene–styrene (SBS), polyethylene (PE), polyphosphoric acid (PPA), Gilsonite, bis-stearamide wax (EBS) and rubber processing oil had significant impacts on the adhesion and self-healing properties of neat Asphalt and SBS-modified Asphalt. The comparison between BBS and DSR tests revealed that the complex modulus of Asphalt had a dual effect on the BBS test results while the comparison of the BBS and Hamburg Wheel Tracking Device (HWTD) tests confirmed that the BBS test could address the mixture resistance to water damage.
Feipeng Xiao - One of the best experts on this subject based on the ideXlab platform.
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investigation of using binder bond strength test to evaluate adhesion and self healing properties of modified Asphalt binders
Construction and Building Materials, 2016Co-Authors: Weidong Huang, Quan Lv, Feipeng XiaoAbstract:Abstract The bond strength between Asphalt and aggregates is a crucial parameter in evaluating the capability of a binder to resist moisture-induced damage. A novel binder bond strength (BBS) test was studied in this paper, and factors affecting the bond strength including pulling rate and Asphalt Film thickness were investigated to propose a reasonable test procedure. The results showed that there is an equivalent relation between the pulling rate and the Asphalt Film thickness. Besides, the influences of different additives on the adhesion and self-healing property of two types of Asphalt (neat Asphalt and SBS modified Asphalt) were investigated using this modified pull-off test. Results indicate that different additives including styrene–butadiene–styrene (SBS), polyethylene (PE), polyphosphoric acid (PPA), Gilsonite, bis-stearamide wax (EBS) and rubber processing oil had significant impacts on the adhesion and self-healing properties of neat Asphalt and SBS-modified Asphalt. The comparison between BBS and DSR tests revealed that the complex modulus of Asphalt had a dual effect on the BBS test results while the comparison of the BBS and Hamburg Wheel Tracking Device (HWTD) tests confirmed that the BBS test could address the mixture resistance to water damage.
Burak Sengoz - One of the best experts on this subject based on the ideXlab platform.
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minimum voids in mineral aggregate in hot mix Asphalt based on Asphalt Film thickness
Building and Environment, 2007Co-Authors: Burak Sengoz, Ali TopalAbstract:Abstract This study is aimed at determining the relationship between Asphalt Film thickness and aging characteristics of various hot-mix Asphalt (HMA) mixtures. Resilient modulus and indirect tensile strength tests were conducted on the Superpave Gyratory-compacted specimens with five different Asphalt Film thicknesses in order to determine an optimum Asphalt Film thickness. From the relationships between the Asphalt Film thickness and resilient modulus and indirect tensile strength test values of the short and long-term aged samples, optimum Asphalt Film thickness has been determined about 9–10 μm. The minimum void content of mineral aggregate (VMA) to obtain this optimum Asphalt Film thickness can be calculated as 15.2%.
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effect of Asphalt Film thickness on the moisture sensitivity characteristics of hot mix Asphalt
Building and Environment, 2007Co-Authors: Burak Sengoz, Emine AgarAbstract:Abstract Temperature, air and water are the common factors that profoundly affect the durability of Asphalt concrete mixtures. In mild weather conditions, distresses such as permanent deformation, fatigue cracking can be encountered on the pavements due to traffic loading. But when a severe climate is in question, these stresses increase in poor materials; under inadequate control; with traffic as well as with water which are key elements in the degradation of Asphalt concrete pavements. Many variables affect the amount of water damage in Asphalt concrete layer. Among them, mixture design properties such as air void level, permeability, Asphalt content and Asphalt Film thickness are the ones that must be investigated carefully. This study is aimed to determine the relationship between the various Asphalt Film thicknesses and the susceptibility characteristics to water of hot mix Asphalt (HMA) so that an optimum Asphalt Film thickness that minimizes the moisture damage of HMA can be obtained. For this purpose, the modified Lottman Test (AASHTO T283) is performed on the Superpave Gyratory compacted specimens that contain 5 different Asphalt Film thicknesses. A good correlation between the Asphalt Film thickness and the modified Lottman test results as well as an optimum Asphalt Film thickness of 9.5–10.5 μm is obtained.
Rong Luo - One of the best experts on this subject based on the ideXlab platform.
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a review and perspective for research on moisture damage in Asphalt pavement induced by dynamic pore water pressure
Construction and Building Materials, 2019Co-Authors: Wentao Wang, Linbing Wang, Haocheng Xiong, Rong LuoAbstract:Abstract Under repeated vehicle loadings, surface runoff and retained water inside Asphalt pavement structure will cause dynamic pore water pressure with positive and negative alternations. Such dynamic pore water pressure squeezes and pumps water flow along the inner wall of void channels to strip Asphalt Film and finally develop into moisture damage. Different from the traditional freeze-thaw and static water immersion mechanisms, dynamic hydraulic scouring induced by vehicle tires demonstrates a more general moisture damage of Asphalt pavement in warm seasons or warm regions. This paper reviews extensive research works in the last decade about moisture damage of Asphalt pavement induced by dynamic pore water pressure. A field survey of distresses characterization for an Asphalt pavement is firstly introduced and analyzed. On the basis of analyzing macro-scale and micro-scale mechanisms of hydraulic scouring, traditional experimental methods for moisture damage evaluation are then discussed. Newly proposed three types of dynamic pore water pressure conditioning systems with their applications, which include pneumatic, piston and other types, are categorized and analyzed. Multiscale experimental investigations considering dynamic pore water pressure are discussed in detail. Numerical simulation on the water-mechanic response, moisture damage characteristics of Asphalt pavement and the real-time monitoring of dynamic pore water pressure in field tests are also summarized. Finally, a series of measures to mitigate moisture damage from the perspective of dynamic hydraulic scouring is proposed.
