Experimental analysis of semi-flexible pavement by using an appropriate cement asphalt emulsion paste

• Published in: Construction & building materials 2020-01, Vol.230, p.116994, Article 116994
• Main Authors: Zarei, Sohrab, Ouyang, Jian, Yang, Wenting, Zhao, Yanqing
• Format: Article
• Language: English
• Subjects: Adhesive ability; Cement asphalt emulsion paste; Low-temperature performance; Rutting resistance; Semi-flexible pavement
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2019.116994

•Effect of CAEP as a grouting material on the mechanical performance of SFP was studied.•Compared to CP in SFP, the CAEP had much better adhesive ability with PAM.•SFP with CAEP had better low-temperature cracking resistance and frost resistance than SFP with CP.•SFP with CAEP is more suitably used in the wet region with both hot summer and cold winter than SFP with CP. Semi-flexible pavement (SFP) has been successfully used in heavy traffic area due to its high rutting resistance around the world. However, its low-temperature performances are still an issue in the application. This study presents the details of a laboratory study on the possibility of using cement asphalt emulsion paste (CAEP) as grouting material to produce SFP to enhance the pavement performances of SFP related to low temperature. Results show that the adhesive ability of CAEP with porous asphalt mixture is better than that of CP. The SFP with CAEP can have enough rutting resistance when asphalt emulsion to cement ratio (AE/C) by weight is no more than 0.4. The normal moisture damage resistance of SFP decreases with the increasing asphalt emulsion content in cement paste, but SFP with CAEP has a better frost damage resistance than SFP with CP. The flexural failure strain of SFP at low temperature increases firstly and then decreases with the increasing asphalt emulsion content. Overall, SFP with CAEP at an appropriate AE/C is more suitably used in the wet region with both hot summer and cold winter than SFP with CP.