合徐高速公路膨胀土路基检测技术

公路建设中路床和路基部分大量使用了石灰（或水泥）改良土。为了保证改良土中含灰量达到设计要求，需要在不同时间检测改良土的灰剂量。为适合二次掺灰工艺，提出了EDTA标准液消耗量随时间降低的标准曲线，将其应用于合徐高速公路路基改良土现场灰剂量检测中，得到了合理的测试结果。

Detection Technique of Expansive Soil in the Hexu Expressway

In expressway construction,lime or cement stabilized soils are widely used in subgrade,and the detection of lime content should be performed frequently so as to ensure the lime content satisfying the design requirement. In this paper, a standard titration curve reflecting the reduction of the consumption of EDTA standard fluid with time is proposed for the two-step lime mixing technology and applied to field detection of lime content in stabilized soils of subgrade of the Hexu Expressway, and the detected results are reasonable. Conclusions drawn in this paper are of great significance to the improvement of the detecting method of lime content and guarantee of project quality.