石灰粉煤灰粒料基层的强度形成机理和裂缝防治

石灰粉煤灰粒料基层中石灰粉煤灰的水化反应和水泥的"二次水化反应"相同,石灰粉煤灰水化反应生成水化硅酸钙等胶凝物是二灰粒料基层强度的主要来源。不同配比的石灰粉煤灰粒料基层的强度不仅取决于石灰粉煤灰混合料的最大干密度的大小,更取决于混合料中石灰粉煤灰胶结料的干密度大小。干缩和温缩裂缝是石灰粉煤灰粒料基层的主要病害,延缓和防止裂缝的出现,可改善半刚性基层路面的使用品质。

Strength Forming Mechanism and Crack Prevention of Lime Fly Ash Aggregate Base

The hydration reaction of lime fly ash and the "secondary hydration reaction" of the cement are same in the lime fly ash aggregate base.The gelling matters of hydration calcium silicate and etc.built from lime fly ash hydration reaction are the main source for the strength of lime-cement aggregate base.The strengths in the different mixture ratios of lime fly ash aggregate base are not only depended on the maximum dry density size of lime fly ash mixture,but also depended on the dry density size of lime fly ash cementing material in mixture.The dry contracted and temperature contracted cracks are the main disease of the lime fly ash aggregate base.To delay and prevent the crack appearance can improve the use character of the pavement on the semi-rigid base.