Materials Reports 2021, Vol. 35 Issue (z2): 150-157 |
INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Crack Resistance of Cold Recycled Mixture with Emulsified Asphalt for Surface Course Based on OT Test |
HAO Peiwen1, LI Wanjun2, HAN Yuxiang2, SU Jizhuang1,3, LE Chen1
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1 School of Highway, Chang'an University, Xi'an 710061, China 2 Shanxi Traffic Construction and Maintenance Engineering Co. Ltd., Xi'an 710117, China 3 Research Center of Bulk Solid Waste Materials Recycled Using in Transportation Field, Jinan 250002, China |
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Abstract The cold recycling technology stabilized with emulsified asphalt is mostly used in the base layer of pavement. Applying it on the surface course is beneficial to the increase of utilization rate of waste material. But at the same time, attention should be paid to the anti-reflective crack performance of the mixture. This paper used the OT test to discuss the influence of different material components on the crack resistance of cold mixture with emulsified asphalt, as well as the design index and corresponding criteria. The results show that the load loss rate after 1 200 load times is qualified as the design index for cold mixture with emulsified asphalt used in surface course. Various factors, including types of aggregate grading, cement and base asphalt, dosage of RAP and cement all have significant influences on the load loss rate. To improve the anti-reflective crack performance of emulsified cold mixture for surface course, the dosage of RAP should not exceed 70%, and the cement should not exceed 1.5%. The PO42.5 cement, the emulsified asphalt made with 70# base asphalt and coarse aggregate gradation are preferential in the raw material selection. It is recommended to supplement the evaluation on anti-reflective crack performance with OT test in the mix design of emulsified cold mixture for surface course, and the load loss rate is required to be less than 80%.
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Published: 09 December 2021
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Fund:This work was financially supported by the National Natural Science Foundation of China (51408050),Scientific Research Project of Shaanxi Provincial Communications Construction Group Company(18-13). |
About author:: Peiwen Hao, doctor, professor and doctoral tutor of Highway School of Chang'an University, enjoys the special government allowance of the State Council. From 2002 to 2004, he was funded by the Japan Society for the Promotion of Suence (JSPS) to do post-doctoral reaseearch in the Institute of Land and Technology Policy in Japan Ministry of Land and Transportation. He has completed more than 50 research projects in recent years, including one project funded by the National Scientific and Technolo-gical Projects in the English Five-year plan, five projects funded by the National Natural Science Foundation, etc. More than 20 provincial and ministerial prizes have been awarded,among which “Road Performance of Asphalt and Asphalt Mixture” has won the second prize for the State Scientific and Technological Progress Award. He has published more than 200 journal papers and owed more than 40 national invention patents. The research interests of his tram include pavement material and structure, asphalt and modified asphalt technology,airport pavement material and construction technology,new paving materials,pavement recycling technology,subgrade engineering,etc. |
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