利用粉煤灰固化风积土的试验研究

AN EXPERIMENTAL RESEARCH ON THE AEOLIAN SOIL REINFORCED BY USING PULVERIZED COAL ASH

采用正交优化试验方法 ,并通过采用掺加新型固化剂的方法对风积土进行固化试验研究。研究结果表明 ,影响稳定土无侧限抗压强度大小的主要因素是水泥量 ,其次是石灰和碎石掺量。粉煤灰掺量为 40 %、水泥掺量为 1 5%、碎石掺量为 40 %、石灰掺量为 8%、固化剂掺量为 5%时 ,无侧限抗压强度最大。在水泥掺量一定的情况下 ,稳定土的无侧限抗压强度随着固化剂掺量的增大而提高。同时初步探讨了掺加固化剂后粉煤灰类稳定土的固化机理。通过现场工业性试验和观测 ,结果表明 ,试验段水泥稳定土基层状况良好 ,在公路上未发现由于水泥稳定风积土的某种缺陷所引起的变形和开裂 。

This paper has presented an optimum orthogonal method for testing the design and study of aeolian soil reinforced by adding some new agents. Since it is very important to study how to reinforce the inattentive aeolian soil that has been frequently used on the construction site of highway projects, the method can be of great use for such highway engineering. The result of our testing shows that the primary factors that may influence the non sideway limit compressive strength of the reinforced soil are the ration of the cement, lime and rubble to be mixed. When the ratio of cement is 15% with pulverized coal ash being 40% and ruble-40%, lime-8%, and solidified agent-5%, it is possible for stabilized soil to reach the maximum of non sideway limit compressive strength. While keeping the ratio constant, it is also necessary to raise the ratio of the reinforced agent. At the same time, we have made a preliminary study on the reinforcing mechanism of the pulverized coal ash in the aeolian soil when adding some solidifying agent in the soil. On spot tests and measuring data demonstrate that the newly paved roadbed by such cement reinforced soil is in a satisfactory condition with no pernicious deformation and fracturing discovered due to the blemish of the reinforced soil. And the bending value has proved to meet the needs of the highway construction.