水化产物钙矾石在软土地基加固中的增强作用  

STRENGTH ENHANCEMENT EFFECT OF ETTRINGITE IN SOIL STABILIZATION

作　　者：黄新[1] 

机构地区：[1]冶金部建筑研究总院地基所,北京100088

出　　处：《硅酸盐学报》2000年第4期299-302,308,共5页Journal of The Chinese Ceramic Society

摘　　要：通常加固软土地基是使用单一的水泥作为固化剂 .研究与实践表明 :由于软土中孔隙量很高 ,采用工业废石膏与水泥配合加固软土 ,其中产生的水化产物钙矾石可以高效率的填充孔隙 ,对固化土的强度增长有显著的增强作用 ,从而使得固化土强度与单纯用水泥加固相比有大幅度的提高 .钙矾石形成过程中 ,液相CaO ,OH- 浓度决定钙矾石的形貌和膨胀性能 ;不同土样对CaO ,OH- 消耗量不同 ,导致固化土液相中CaO ,OH- 浓度不同 ;因而 ,对不同的土样 ,采用废石膏和水泥配合加固的效果不同 .Portland cement is generally used alone as solidified agent for solidifying soft soil. There exist a lot of pores in the soft soil. The research and practice show that when industrial waste gypsum is combined with portland cement to solidify soil, the strength of the solidified soil will be much higher than that when cement is used only, because of the effect of ettringite on filling pores. The concentration of OH - and CaO in the liquid of different solidified soil samples are different, because the amount of OH - and CaO absorbed by different soil samples are different. It is the concentration of OH -, CaO in the liquid where the ettringite grows that determine the expansion property of ettringite. Therefore, the strengthening effect of ettringite in solidifying soil is different to different soil samples.

关 键 词：水泥 工业废石膏 钙矾石 加固地区 软地地基 

分 类 号：TU447[建筑科学—岩土工程] TQ172.1[建筑科学—土工工程]