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Performance of asphalt binders modified by different crumb rubbers(PDF)

长安大学学报（自然科学版）[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2018年05期
Page:
1-8
Research Field:
道路工程
Publishing date:

Info

Title:
Performance of asphalt binders modified by different crumb rubbers
Author(s):
ZHANG Xiaoliang;  CHEN Huaxin;  ZHANG Ben;  KUANG Dongliang
Keywords:
road engineering;  source of rubber powder;  rubber asphalt;  degradation behavior;  asphalt performance
PACS:
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DOI:
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Abstract:
To evaluate the effect of the source and compositions of rubber powder on the performance of rubber asphalt, five rubber powers which crushing at room temperature were obtained from a heavy truck, sedan tire, sole rubber, tire tread, and tire bead. The components content of rubber hydrocarbons were analyzed by thermogravimetric analysis. The degradation degree of rubber powder in asphalt was analyzed by the toluene soluble content test. Further, an elastic recovery test, dynamic shear rheometer （DSR）, low temperature bendingbeam rheometer（BBR）, and forceductility test were employed to evaluate the elastic recovery rates, highlow temperature stabilities, and lowtemperature crack resistances of the five types of rubber asphalt. The results show that the rubber powders of different sources consist of different components. The rubber of tire and sole rubber is mainly composed of carbon black and vulcanized rubber. The proportion of natural and synthetic rubbers is significant differences of vulcanized rubber. Under hightemperature shear conditions, the toluene soluble content (mass fraction, the same below) of the five rubberasphalts is more than 39%. This indicates that the five rubber powders demonstrate obvious degradation behavior. The toluene soluble content of the sole rubber powder modified asphalt can reach 50.97%, which is significantly higher than those of other rubber asphalts. The toluene soluble content of the heavy truck asphalt is larger than that of the sedan tire. The lowest toluene soluble content is noted for the tire bead, which is the weakest in the process of asphalt depolymerization. The tire bead rubber powders demonstrate larger stiffness, resulting in the rubber recovery being significantly lower than the other soft rubbers. The high and low temperature rheological properties of the heavyduty truck tire rubber powder modified asphalt is significantly. The degree of depolymerization and swelling of the rubber powder in the asphalt affects the performance of the rubber asphalt.

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Last Update: 2018-10-23