Gradation Segregation Analysis of Warm Mix Asphalt Mixture
Publication: Journal of Materials in Civil Engineering
Volume 30, Issue 4
Abstract
In this study, properties of warm mix asphalt (WMA) compacted with various levels of gradation segregation were evaluated in the laboratory. Six segregated gradations were designed to compare with the control gradation and test sections were paved with the control gradation. Then pavement quality indicator (PQI) and field coring were used to evaluate the uniformity of the WMA test sections with the statistical method. In addition, sieve analysis of the cores was conducted to evaluate the level of segregation. The test results show that gradation segregation has a remarkable effect on water stability, high-temperature stability, low-temperature cracking, and tensile strength of WMA mixtures. Statistical analysis results show that the levels of segregation in localized areas are quite typical because the air void contents follow a normal distribution and the mixtures along the central line are denser than other areas. Sieve analyses of the cores show that most places of the typical segregated localized areas in the test sections have no segregation or low-level segregation, so the construction quality is good. It also shows that the air void content increases as the gradation gets coarser, which is consistent with laboratory test results.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (Grant No. 51308075), Department of Transport of Hainan Province (Number JT20160898009), Foundation of Hunan Educational Committee (Number 15C0044), and Open Fund of State Engineering Laboratory of Highway Maintenance Technology (Changsha University of Science and Technology) (Grant Nos. kfj160101 and kfj140104). The financial support to Siyu Chen from the China Scholarship Council and Michigan Technological University is also gratefully appreciated.
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Published In
Journal of Materials in Civil Engineering
Volume 30 • Issue 4 • April 2018
Copyright
©2018 American Society of Civil Engineers.
History
Received: Apr 20, 2017
Accepted: Sep 19, 2017
Published online: Jan 17, 2018
Published in print: Apr 1, 2018
Discussion open until: Jun 17, 2018
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