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首先分析了通过击实试验确定最佳含水量和最大干密度的缺陷,然后提出了考虑集料吸水率的最佳含水量和最大干密度的理论计算公式。根据理论计算原理,对杭长高速的2个路面合同段水泥稳定碎石基层,进行了最佳含水量和最大干密度的理论计算,结果表明集料的吸水率对混合料的最佳含水量和最大干密度有重要的影响。通过室内振动击实与现场试验段采集到的干密度标准值对理论计算结果进行了准确性评价,对比结果表明,理论计算结果得到的最佳含水量和最大干密度与击实和现场灌砂标准值相差不大,反映在压实度上仅相差0.2%和0.3%,完全能够满足要求。最后对3种状态下的干密度进行了无侧限抗压强度试验,结果表明差别较小。
Firstly, the defects of determining the optimum water content and the maximum dry density by compaction test were analyzed. Then the theoretical formula of the optimum water content and the maximum dry density considering the water absorption of the aggregate was proposed. According to the principle of theoretical calculation, the theoretical calculation of optimum moisture content and maximum dry density of two cement pavement of the pavement section of Hanghang Expressway was carried out. The results showed that the optimum water content And the maximum dry density has a significant impact. The accuracy of theoretical calculation results was evaluated by indoor vibration compaction and the standard value of dry density collected in the field test section. The comparison results show that the optimal water content and maximum dry density obtained from the theoretical calculation are in good agreement with the compaction and on-site sand filling The difference between the standard values is not reflected in the degree of compaction of only 0.2% and 0.3%, fully able to meet the requirements. Finally, the unconfined compressive strength tests were conducted on the dry density under the three conditions, the results show that the difference is small.