多种湿法橡胶改性沥青的综合性能评价与改性机理研究

doi:10.11896/cldb.21120124

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Abstract This work aimed to comprehensively evaluate the high-temperature anti rutting, medium-temperature anti fatigue, low-temperature anti cracking and flow-construction performances of these three kinds of rubber modified asphalts, conventional crumb rubber modified asphalt (CRMA), Terminal Blend rubber asphalt (TBRA) and desulfurized rubber asphalt (DRA), and discussed their modification mechanism from the perspective of chemical functional groups and rheological properties. Using rutting factor, zero-shear viscosity and irrecoverable compliance, the high-tempe-rature performance of asphalts was evaluated from the perspectives of viscosity and elasticity; the time sweep test and linear amplitude sweep test were conducted to evaluate the fatigue resistance of asphalts at medium temperature; the low-temperature bending rheometer test and 135 ℃ Brookfield viscosity test were used to evaluate the low-temperature crack resistance and construction workability of asphalts; finally, based on the modulus-temperature sweep test, Arrhenius model fitting and infrared spectroscopy test, the modification mechanism of different rubber asphalts was studied from the perspective of rheology and chemistry. The results show that the rubber molecules in CRMA have the most obvious agglo-meration, which translates to the best elasticity and mechanical properties, but also the largest viscosity. CRMA exhibits an obvious rubbery platform and non-Newtonian fluid behavior at high temperatures. The rubber particles in TBRA have the highest degradation rate, the rubber molecules are completely miscible with the asphalt molecules, and thus the viscosity is close to that of the base asphalt. The degree of degradation of the DRA is between the two, and the modification effect is more balanced. DRA is a promising means of recycling solid waste of waste tires.

Key words： road engineering conventional crumb rubber modified asphalt Terminal Blend rubber asphalt desulfurized rubber asphalt rheology FTIR

Published: 25 August 2022 Online: 2022-08-29

CLC number:

U414.1

Fund:National Natural Science Foundation of China (52008353, 51908426), China Postdoctoral Science Foundation (BX20190240, 2019M660097), Sichuan Youth Science and Technology Innovation Research Team (2021JDTD0023, 2022JDTD0015), and Chengdu Technological Innovation R & D Project (2021-YF05-01175-SN).

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	Articles by authors
	YAO Zhen
	ZHANG Lingbo
	LIANG Pengfei
	WANG Shifeng
	YAN Chuanqi

Cite this article:

YAO Zhen,ZHANG Lingbo,LIANG Pengfei, et al. Comprehensive Performance Evaluation and Modification Mechanism of Various Wet Rubber Modified Asphalt[J]. Materials Reports, 2022, 36(16): 21120124-7.

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http://www.mater-rep.com/EN/10.11896/cldb.21120124 OR http://www.mater-rep.com/EN/Y2022/V36/I16/21120124

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