Void Distribution in Zeolite Warm Mix Asphalt Mixture Based on X-ray Computed Tomography

Materials

Liying Yang¹  Junda Ren²  Nan Liu²  Jingyi Liu²  Chao Xing³  Yiqiu Tan⁴ 

[1] Beijing Municipal Road &Liaoning Transportation Research Institute Co. Ltd., Key Laboratory of Transport Industry of Expressway Maintenance Technology, Shenyang 110000, China;School of Transportation Science and Engineering, Harbin Institute of Technology, Harbin 150000, China;School of Transportation Science and Engineering, State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150000, China;

关键词: asphalt mixture;    warm mix;    zeolite;    CT method;    void distribution;   

DOI  :  10.3390/ma12121888

来源: DOAJ

【 摘 要 】

Warm mix asphalt mixtures have the advantages of energy saving, emission reduction and good road performance. Zeolite asphalt mixtures, as a warm mixing technology, have been applied in the world. To understand the warm mix mechanism of zeolite warm mix asphalt mixture, the mesoscale structure of zeolite asphalt is studied. Micro computed tomography (CT) is utilized to obtain the internal structure image of zeolite-modified asphalt and asphalt mixture. The quantity and volume of voids are used as internal void distribution evaluation indexes. The results indicate that with respect to the void distribution in zeolite-modified asphalt, with the increase of temperature, there is an obvious evolution trend of smaller voids to larger voids. With respect to the voids in the zeolite-modified asphalt mixture, the zeolite asphalt mixture is equivalent to hot mix asphalt mixture when it is above 120 °C, while below 120 °C, the maximum and average void volumes increase significantly, making it difficult for the mixture to achieve ideal compaction effect.

【 授权许可】

Unknown