Experimental Study on Frost Resistance and Crack Resistance of Bases in Cold Areas Based on Vibration Mixing Technology
CHEN Ke1, SUN Fen2, LIANG Shuang1, ZHANG Haitao3
1 Heilongjiang Provincial Highway Survey and Design Institute, Harbin 150080, China 2 Heilongjiang Polytechnic, Harbin 150080, China 3 College of Civil Engineering, Northeast Forestry University, Harbin 150040, China
Abstract: In order to improve the shrinkage performance of semi-rigid base of cement stabilized macadam, the mixing of the mixture is uneven, and improve the road performance such as frost resistance of the base layer, vibration mixing technology was used to improve the performance of the base layer and improve its crack resistance and frost resistance and other road performance. Vibration mixing technology is a mechanical strengthening technology that can better improve the mixing quality. In this paper, the frost resistance and shrinkage of vibrating agitated cement stabilized macadam mixture were studied. The freeze-thaw tests were carried out on two different cement stabilized macadam mixtures. The test results showed that the indoor vibrating cement stabilized macadam base material was frozen. The strength loss after the melting cycle is less than that of the non-vibrating agitated cement stabilized macadam mixture after freezing and thawing, and the BDR value of the vibrating and stirring cement stabilized macadam base material is larger than the BDR value of the non-vibrating stirring, and the effect is more obvious. It is thus concluded that the vibration stirring technique helps to enhance the frost resistance of the base material. According to the comparative analysis of the shrinkage performance test, the experimental study shows that the vibration stirring energy can significantly reduce the shrinkage strain and shrinkage coefficient of the mixture; and the results of the electron microscope test also prove that the cement binder can be better dispersed around the aggregate under the action of vibration. In order to make the mixture better as a whole, it can be seen from the test that the vibration is more uniform and the crack width is smaller in the vibration-mixed cement stabilized macadam mixture, which indicates that the vibration can enhance the crack resistance of the base material and reduce the occurrence of cracks.
陈柯, 孙芬, 梁爽, 张海涛. 基于振动搅拌技术高寒地区基层抗冻性与抗裂性试验研究[J]. 材料导报, 2021, 35(Z1): 291-296.
CHEN Ke, SUN Fen, LIANG Shuang, ZHANG Haitao. Experimental Study on Frost Resistance and Crack Resistance of Bases in Cold Areas Based on Vibration Mixing Technology. Materials Reports, 2021, 35(Z1): 291-296.
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2021, Vol. 35 
