Research On Improving Shrinkage Performance Of Cement Stabilized Gravel

Cement stabilized gravel has high strength, good stability, anti-erosion properties and better anti-fatigue property, but it is easy to produce desiccation cracks when humidity changes (caused by evaporation), resulting in reflection crack on the bituminous pavement surface, then influences performance and the service life of the pavement. This flaw is very obvious. And along with changes in traffic conditions, semi-rigid asphalt pavement encounters two big challenges heavy load transportation and the early damage. Therefore, it will have the significant economic efficiency and the social meaning to the present construction and the maintenance of the semi-rigid highway pavement surface to propose a long life semi-rigid asphalt concrete pavement design method which is adapt to the heavy-duty traffic. It will also have instruction and reference value to the low grade road bituminous pavement, the urban road bituminous pavement and the runway bituminous pavement's construction and the maintenance. Therefore, this article has conducted the research with following several steps:Firstly, the study set out to determine the grade and cement consumption, and then get the best amount of moisture and maximum dry density according to the compaction test results of different mixtures with different contents of expansive agent and shrinkage reducing admixture. Meanwhile, makes a generalized analysis of the admixture impact to the mixture by performing the delay time compaction test and gets a conclusion about the impact of delay time to the mixture.And then ,through the compressive strength, the cleavage strength, the cleavage module as well as the air shrinkage experiment on the cement stabilized mixture with different contents, appraises its crack resistance performance by selecting the shrinkage anti-crack coefficient recommended by Yajun Liang then gets the best contents of expansive agent and shrinkage reducing admixture by recombining with compressive strength.Finally, makes a generalized analysis about pavement performances of mixture with best amount of admixture and mixture without admixture then gets a conclusion about the effects of improving shrinkage performance of cement stabilized mixture by adding admixture.