期刊
JOURNAL OF MATERIALS IN CIVIL ENGINEERING
卷 33, 期 3, 页码 -出版社
ASCE-AMER SOC CIVIL ENGINEERS
DOI: 10.1061/(ASCE)MT.1943-5533.0003535
关键词
Asphalt pavement; Aggregate segregation; Asphalt content; Specific surface area; Mechanical properties
资金
- National Key R&D Program of China [2018YFB1600100]
- National Natural Science Foundation of China [51908072, 51778071]
- Huxiang High-Level Talent Gathering Project of Hunan Province [2019RS1048]
- Excellent Youth Project of Hunan Providence Department of Education [19B009]
- Special Funds for the Construction of Innovative Provinces in Hunan, China [2019SK2171]
This study proposed a set of segregation evaluation indexes that divided gradation types into five levels, evaluating the impact of various segregation levels on the volumetrics, mechanical performance, and road performance of asphalt pavement. The result showed that the degree of aggregate segregation significantly affects the performance of asphalt mixtures.
The aggregate segregation during construction has a significant impact on the performance of asphalt pavement; however, the segregation evaluation parameters selected by different researchers varied a lot. Also, standard criteria for the impaction of segregation on the performance are still lacking. Therefore, this research proposed a set of segregation evaluation indexes that divided the gradation types into five levels, from coarse-severe to fine-severe gradation. The impact of various segregation levels on the volumetrics, mechanical performance, and road performance of the pavement were evaluated. The mechanical test results indicated that, given the change in the segregation degree from coarse to fine, the Marshall stability and immersive residual stability of the asphalt mixture obviously increased, and the dynamic stability and low temperature failure strain of the heavy segregation gradation obviously decreased. The result also indicated that the rutting resistance first increased first and then decreased because of the cohesion reduction when the gradation was changing from fine to coarse. The result found that the proposed evaluation index can reasonably characterize the degree of aggregate segregation.
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