High temperature rheological characteristics of activated crumb rubber modified asphalts

Chen, Zixuan; Pei, Jianzhong; Wang, Tao; Amirkhanian, Serji

doi:10.1016/j.conbuildmat.2018.10.223

Cited by 62 publications

(16 citation statements)

References 26 publications

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“…It is obtained from Figure 5 c that the softening point of rubberized asphalt mixtures with different contents meets the standard requirements, which is mostly concentrated at 65–73 °C. They are 31.7–45.7% higher than neat asphalt, indicating that rubber powder can effectively improve the high-temperature properties of neat asphalt [ 16 ]. However, there is no apparent difference in the softening point of rubberized asphalt in various rubber powder contents.…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…Fourier transform infrared reflection usually analyzes the chemical structure of petroleum asphalt and a polymer [ 9 , 16 ]. This is mainly carried out through the absorption of polymers under different wavelengths of infrared radiation.…”

Section: Test Results and Discussionmentioning

confidence: 99%

“…The former is an infrared spectrum to analyze the most valuable analysis area. While the latter is involved, slight differences in molecular structure will produce changes [ 9 , 16 , 28 ].…”

Section: Experiments Methodsmentioning

confidence: 99%

“…Simple mechanical stirring takes a long time, and the effect is not outstanding [ 15 ]. Such modifiers must use colloid mills or special shearing equipment to ensure that the modifiers are fully dispersed in the neat asphalt [ 16 , 17 ].…”

Section: Introductionmentioning

confidence: 99%

“…If the project volume is not large, there is the risk of producing a large amount of waste, which is also an obstacle to the promotion of rubberized asphalt—underdeveloped construction and workability [ 3 , 7 , 15 ]. Because rubber-modified asphalt’s viscosity is too large, the workability of construction is a deviation, and the amount of rubber powder is not high [ 16 , 21 ].…”

Section: Introductionmentioning

confidence: 99%

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Laboratory Investigation of Rubberized Asphalt Using High-Content Rubber Powder

Wang

et al. 2020

Materials

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Rubberized asphalt (RA) has been successfully applied in road engineering due to its excellent performance; however, the most widely used rubber content is about 20%.To improve the content of waste rubber and ensure its performance, seven rubberized asphalts with different powder content were prepared by high-speed shearing. Firstly, penetration, softening point, and ductility tests were carried out to investigate the conventional physical features of high-content rubberized asphalt (HCRA). Then, the dynamic shear rheometer test (DSR) was conducted to estimate the high-temperature rheological properties. The bending beam rheometer test (BBR) was carried out to evaluate the low-temperature rheological performance. Finally, combined with the macroscopic performance test, the modification mechanism was revealed by the Fourier transform infrared reflection (FTIR) test, and scanning electron microscope (SEM) analysis was used to observe the microscopic appearance before and after aging. The results show that rubberized asphalt has excellent properties in high- and low-temperature conditions, and fatigue resistance is also outstanding compared with neat asphalt. As the crumb rubber content increases, it is evident that the 40% RA performance is the best. The low-temperature properties of HCRA are better than the traditional 20% rubberized asphalt. This study provides a full test foundation for the efficient utilization of HCRA in road engineering.

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Section: Test Results and Discussionmentioning

confidence: 99%

Section: Test Results and Discussionmentioning

confidence: 99%