泡沫轻质土路基浇筑体质量试验研究

Research on Quality Assessment Methods for FLS Casting Subgrade

泡沫轻质土浇筑体是含有微裂缝、收缩裂缝、推挤分层、融合消泡等缺陷的水泥基材料。采用钻芯法和轻型圆锥动力触探法对泡沫轻质土浇筑体的质量进行了尝试性试验,以期验证两种方法对浇筑体进行质量检验的可行性和可靠性。结果表明,泡沫轻质土在按施工要求浇筑的前提下,钻芯法所取芯样光滑完整,无侧限抗压强度离散性小,可直接表征实际浇筑质量;通过贯入击数的变化可以直接判定浇筑体的均匀性,贯入30 cm深度的击数与对应的无侧限抗压强度具有良好的线性关系,通过回归公式可预测浇筑体的抗压强度。

Foam lightweight soil(FLS)casting masses are cement-based material with defects such as micro-cracks,shrinkage cracks,pushing layers,fusion and defoaming.The drilling method and the light cone dynamic penetration method are used to test the quality of the casting masses in order to verify the feasibility and reliability of the two methods for the quality assessment of the casting masses.The results show that under the premise that the FLS is cast according to the construction requirements,the core samples taken by drilling method are smooth and integral,and the discreteness of unconfined compressive strength is small,which can directly confirm the quality of FLS masses on site.The uniformity of the FLS masses can be directly determined by the change of the number of hits.The number of hits penetrating 30cm depth has a good linear relationship with the corresponding unconfined compressive strength,and the compressive strength of the FLS masses can be predicted by the regression formula.