Laboratory Investigation of Compaction Characteristics of Plant Recycled Hot-Mix Asphalt Mixture

Jiangang Yang, Chen Sun, Wenjie Tao, Jie Gao, Bocheng Huang and Jian Zhang
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Jiangang Yang: School of Transportation and Logistics, East China Jiaotong University, Nanchang 330013, China
Chen Sun: School of Transportation and Logistics, East China Jiaotong University, Nanchang 330013, China
Wenjie Tao: School of Transportation and Logistics, East China Jiaotong University, Nanchang 330013, China
Jie Gao: School of Transportation and Logistics, East China Jiaotong University, Nanchang 330013, China
Bocheng Huang: Fujian Expressway Maintenance Engineering Co., Ltd., Fuzhou 350001, China
Jian Zhang: Beijing Urban Construction Road and Bridge Construction Group Co., Ltd., Beijing 100088, China

Sustainability, 2021, vol. 13, issue 6, 1-16

Abstract: In this study, the compaction characteristics of recycled hot-mix asphalt (RHMA) were evaluated using the void content ( VV ), compaction energy index ( CEI ), slope of accumulated compaction energy ( K ), and lock point ( LP ). Then, the effects of the compaction parameters, including the gradation of the RHMA, reclaimed asphalt pavement (RAP) content, temperature of gyrations, and number of gyrations, on the compaction characteristics of RHMA were investigated. An orthogonal experiment was designed and the data collected were analyzed via range analysis; then, a regression model was generated relying on a quadratic polynomial. Furthermore, the regression model was used for the comparison and prediction of the mixture’s compactability during the material design. Finally, the compaction mechanism of RHMA was discussed from the perspective of the void content of RAP particles. The results showed that a finer aggregate gradation, a higher gyration temperature, a greater number of gyrations, and a higher RAP content were effective for increasing the compactability of RHMA. The range analysis results suggest that the gradation of RHMA has the greatest influence on compactability, followed by the RAP content. The RAP aggregate cannot diffuse to a new mixture completely, so the remained RAP particle reduces the void content of RHMA. Therefore, a higher RAP content up to 50% can help RHMA to achieve the designed void content with higher efficiency.

Keywords: hot-mix recycled asphalt mixture; compaction characteristics; RAP (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2021
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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Persistent link: https://EconPapers.repec.org/RePEc:gam:jsusta:v:13:y:2021:i:6:p:3005-:d:513957

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