高含水量粘土固化剂的研究  

On the stabilizer for the soil with higher water content

作　　者：刘顺妮[1,2] 林宗寿[1,2] 陈云波 

机构地区：[1]武汉工业大学材料工程系 [2]天津水泥工业设计研究院

出　　处：《岩土工程学报》1998年第4期72-75,共4页Chinese Journal of Geotechnical Engineering

摘　　要：采用水泥、单一外加剂和复合外加剂对高含水粘土进行固化试验，并运用Ｘ射线衍射和扫描电子显微照相等对加固土进行了分析。研究结果表明，当土壤含水量较高（４８％左右）时，在水泥中掺１４％的石膏及３％的硫酸钠，能大幅度提高固化土的强度；在硫酸盐外加剂的作用下，粘土中的活性氧化铝与Ｃａ（ＯＨ）２反应生成针状的钙矾石晶体，从而使土团与水化产物相互联接，大大提高稳定土的强度和水稳性；较多的钙矾石晶体的形成是硫酸盐外加剂能大幅度提高固化土强度的主要原因。In this paper, portland cement and the stabilizers composed of the single additive or composite additive were used to stablize the soil with higher water content. The stabilized soil was studied by means of X ray diffraction and scanning electron microscropy. The results show that the compressive strength of soil with 48% or higher water content can be increased substantially by using the stabilizer composed of 83%(Wt) portland, 14% anhydrite and 3% sodium sulphate. The sulphate admixture can promote the reaction of the active alumina of soil with Ca(OH) 2 to form more aciculate AFt(3CaO·Al 2O 3·3CaSO4·32H 2O) crystal and increase greatly the strength and water stabilizing property of stabilized soil. The main reason for the sulphate admixture to increase the strength of stabilized soil is that the additive promotes the formation of more AF t.

关 键 词：土壤 固化土 固化剂 外加剂 水泥 石膏 软土 

分 类 号：TU521.3[建筑科学—建筑技术科学] TU447