二灰稳定碎石收缩特性

为了深入研究各种因素对二灰稳定碎石混合料收缩特性的影响,对不同级配、不同二灰含量和不同龄期的二灰稳定碎石材料进行了温缩系数和干缩系数的测试,结果表明,具有骨架密实结构的二灰稳定碎石材料拥有较好的抗收缩特性;当级配一定时,混合料的温缩、干缩系数随着二灰含量的增大而增大;当二灰含量一定时,混合料的温缩系数随龄期的增加而不断增大;方差分析结果表明,对于温缩系数,龄期和二灰含量均为显著影响因素,且后者的影响更为显著;对于干缩系数,级配类型和二灰含量为显著影响因素,且前者的影响更为显著。

Study on the shrinkage performance of lime-fly ash stabilized crushed stone

In order to study the effect of several factors on the shrinkage performance of lime-fly ash stabilized crushed stone,temperature shrinkage coefficients and dry shrinkage coefficients of the mixtures with different gradations,lime and fly contents and ages were measured.The results indicate that the mixture with a stone-on-stone contact has a better shrinkage-resistance performance.For the same gradation,both dry shrinkage coefficient and temperature coefficient become improved with the increase of lime-fly content and when the lime-fly content is the same,temperature shrinkage coefficient increases with age.Results of analysis of variance show that for the temperature shrinkage coefficient,both the effect of age and lime and fly content are important,but the latter is more important than the former.For the dry shrinkage coefficient,both gradation and lime and fly content are important factors,but the former is more important than the latter.