红黏土置换作用对水泥固化泥炭土强度的影响

Effect of Red Clay Replacement on Strength of Cement Stabilized Peaty Soil

针对红黏土置换后的泥炭土进行了水泥加固试验,并从宏观和微观两个角度对其固化机理展开了分析.研究表明:在含水率一定的条件下,固化泥炭土的无侧限抗压强度随红黏土置换率的提高呈先增大后减小的趋势;红黏土的置换作用一方面能够使其颗粒作为骨架填充固化土体的孔隙,另一方面在减少土体有机质含量的同时增加了Al元素含量,激发水化反应的活性并促进了钙矾石的生成.红黏土置换作用能够使泥炭土的絮状结构变得密实,颗粒连接和孔隙填充得到优化.

The red clay was applied to replace the peaty soil at a certain percentage,and the test study on the stabilized peaty soil was carried out with cement.The stabilized mechanism was discussed from macroscopical and microscopical aspects.The results show that the unconfined compressive strength of stabilized peaty soil increases firstly and then decreases with the increase of the replacement rate of red clay when the moisture content is the same.On the one hand,the replacement of red clay enables the particles to fill the soil pores as skeleton.On the other hand,the red clay reduces the organic matter content in the peaty soil and increases the Al content in the stabilized system simultaneously,which excites the activity of hydration and promotes the formation of ettringite.This can make the flocculent structure of peaty soil dense,the particles cementation and the pores filling optimized.