Gradation Segregation Characteristic and Its Impact on Performance of Asphalt Mixture
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Volume 33, Issue 3
Abstract
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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Data Availability Statement
All of the data, models, and code generated or used during the study appear in the published article.
Acknowledgments
The research was supported by the National Key R&D Program of China (Grant No. 2018YFB1600100); National Natural Science Foundation of China (Grant Nos. 51908072 and 51778071); Huxiang High-Level Talent Gathering Project of Hunan Province (Grant No. 2019RS1048); Excellent Youth Project of Hunan Providence Department of Education (Grant No. 19B009); and the Special Funds for the Construction of Innovative Provinces in Hunan, China (Grant No. 2019SK2171).
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Published In
Journal of Materials in Civil Engineering
Volume 33 • Issue 3 • March 2021
Copyright
© 2020 American Society of Civil Engineers.
History
Received: Apr 16, 2020
Accepted: Jul 6, 2020
Published online: Dec 16, 2020
Published in print: Mar 1, 2021
Discussion open until: May 16, 2021
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