骨架密实型二灰碎石基层的收缩性能

基于失水率、干缩应变、干缩系数等指标,研究了不同配合比条件下二灰碎石混合料的干缩性能;回归分析了累计干缩量与时间、累计失水率的关系;通过温缩试验研究了温缩系数与温度区间、平均温缩系数与最大温缩系数的关系。试验结果表明:多碎石条件下的二灰稳定碎石干缩性能优于常规配比的二灰稳定碎石混合料。配合比分别为8∶12∶80,6∶14∶80,8∶17∶75的二灰碎石混合料干缩性能均优于配合比为5∶10∶75;评价材料温缩性能时以0～-10℃之间的温缩系数为标准较为合理。

Research on Shrinkage Performance of Dense Skeleton Based on Lime Fly-Ash Stabilized Aggregate

Dry shrinkage performance of lime fly-ash macadam was analyzed with different mix proportions,which was based on the indices of water loss rate,dry shrinkage strain and shrinkage coefficients.By regression analysis,the relation of accumulative dry shrinkage amount with time and accumulative water loss rate was got.Through temperature shrinkage test the relation between temperature shrinkage coefficient and temperature range was studied,and the relation between average temperature shrinkage coefficient and maximum temperature shrinkage coefficient was researched.The results show that: dry shrinkage performance with lime fly-ash stabilized aggregate in gravelly conditions is superior to the normal lime fly-ash macadam mixture.Dry shrinkage performance is in different orders after forming the specimens at early and late time with different mix proportions.Dry shrinkage performance with mix proportion of 8 ∶ 12 ∶ 80,6 ∶ 14 ∶ 80,8 ∶ 17 ∶ 75 are superior to 5 ∶ 10 ∶ 75.It is reasonable that using temperature shrinkage coefficients of 0～-10℃ to evaluate the temperature shrinkage performance of lime fly-ash stabilized aggregate.