半刚性基层材料抗裂性能试验研究

Experimental Research on Crack Resistance of Semi-rigid Materials

深入研究分析水泥石灰粉煤灰稳定类与石灰粉煤灰稳定类和水泥稳定类的抗裂性能具有重要的意义。提高半刚性基层材料的抗裂性能,必须同时提高干缩性能和温缩性能,本文对不同级配和结合料的半刚性基层材料进行了干缩试验和温缩试验研究。试验结果表明,细集料级配对二灰砂砾的抗裂性能有显著影响,二灰砂砾的干缩性能优于水泥稳定砂砾,合理配比三灰砂砾的干缩性能最优。半刚性基层材料的温度收缩系数在试验温度区间内,随温度降低而出现峰值,且变化趋势基本相同。

It＇s of great significance to study the cracking resistances of semi-rigid materials stabilized by cement-lime-fly ash, lime-fly ash, and cement. To enhance the crack resistance, the behavior of dry shrinkage and temperature shrinkage must be improved. The dry shrinkage and temperature shrinkage tests were performed to semi-rigid materials with different gradations and binders. The test results show that the fine aggre- gate gradation remarkably influences the cracking resistance of lime-fly ash stabilized granule, and the per-formance of lime-fly ash stabilized granule is better than that of cement stabilized granule, and that of lime-fly ash stabilized granule with reasonable ratio is the best. The temperature shrinkage coefficient of semi-rigid material increases with the decrease of the temperature in the test temperature range.