Design and Performance Evaluation of Cement Enhanced Cold Patch Asphalt Mixture
Cutback asphalt mixture, which is less sensible to temperature, easy to compact, and environmental-friendly, has been widely used as the pothole patch material. Since most pavement potholes are caused by water or winter freeze-thaw, it is vital to improve the water stability and ensure the durability and stability of the pothole patch material. In this study, a new method is proposed to improve the moisture stability of cold patch asphalt mixture by incorporating cement. The performance of cold patch asphalt mixture with different cement content is tested through Marshall test and freeze thaw split test. Test results showed that cutback asphalt mixtures had a relatively weak initial strength and adding cement significantly increased the strength as an effective mineral filler. The TSR of designed cutback cold mix was lower than 80%. Adding cement significantly improved the TSR, indicating an enhanced resistance to freeze-thaw damage. For the 3% and 6% cement content, the TSR were even higher than 100%, clearly indicating the hydration of cement during the freeze-thaw cycle. Further, for longer soaking time, higher cement content showed improved strength, which is also a good indicator of the hydration of cement mixed in the cutback mixes. Findings from this study can be utilized directly to fix the pavement pothole and to improve the water stability of the cold asphalt mixture for practical application.
KeywordsCold patch asphalt mixture Cement Water stability Pavement pothole
This study was supported by the project titled “Effectiveness and Applicability of Asphalt Pavement Maintenance Techniques in Zhejiang” (Project no. 8521002166) founded by Zhejiang Transportation Engineering Construction Group Co., a research project titled “Data mining of Highway Pavement Performance and Evaluation of Maintenance Treatment Effectiveness” (Project no. 3221007409) founded by Southeast University and a research project titled “Highway pavement and subgrade structure and material performance evaluation” (Project no. 7621000131) funded by Jiangsu Department of Transportation. The contents of this paper reflect the views of the authors, who are responsible for the facts and the accuracy of the data presented herein, and do not necessarily constitute a standard, specification or regulation.
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