石灰改良膨胀土的灰剂量衰减规律研究

高含水量的膨胀土采用掺灰处理后,由于石灰与土发生离子交换反应,使得灰剂量检测中EDTA滴定量随时间延长发生衰减,以宁淮高速公路淮安段石灰改良膨胀土灰剂量检测方法的试验研究为例,结果发现EDTA消耗量随掺灰后时间的对数呈线性衰减关系,对此提出了与时间有关的改良土灰剂量检测标准曲线,并给出了绘制检测标准曲线的详细步骤。通过该标准曲线能够在任意需要的时间进行改良土中灰剂量的检测,而且操作方便简单,检测结果精度高。

Study on Lime Content Reduction Regularity in Lime Stabilized Soil

High water content expansive soil could be used to the embankment filling of expressway when lime is mixed with the soil.A lime soil content measurement method is presented as an example used for lime stabilized expansive soil on Huaian section of Ning-Huai expressway.It is found that the consumption of EDTA for testing the content of lime reduces with time from the lime mixed in soil because of the chemical reaction between lime and soil.A time related standard curve is put forward for the modification soil lime measurement,with detailed procedures to get the standard curve.According to the test results,the modified standard curves are given for measuring lime contents which is not influenced by the time.