利用熟石灰改善水泥固化土早期强度的试验研究

以内蒙古河套地区粉质粘土为研究对象，在水泥掺量一定的情况下，将熟石灰作为水泥土的外掺剂，通过室内无侧限抗压强度试验，探讨熟石灰掺量、龄期对水泥土早期无侧限抗压强度的影响规律。试验研究表明：在熟石灰的参与下，水泥土中存在火山灰作用和离子交换作用，但是作用效果较小，从而证明水化作用是水泥土强度的最主要来源。结合试验粘土特性和水泥土强度增长规律提出粘土中粘土矿物数量不足限制了火山灰作用和离子交换作用，超量熟石灰对水泥土强度基本没有影响。

Experimental Study on properties of Early Strength of lime-cement soil

Silty clay of irrigation district was selected for study in Hetao, Inner Mongolia. Slaked lime was used as admixture of cement and soil in the case of certain cement content, and the influence factors of dosage and the age of cement soil was analyzed according to the unconfined compressive strength experiment.The results showed that the cement soil had pozzolanic effect and ion- exchange action under the participation of slaked lime, but the degree of effects was low. So hydration was the most important source of strength. Combined with characteristic of clay and strength growth regulation, the pozzolanic effect and ion-exchange action was limited with insufficient clay minerals and impact of excess calcium hydroxide to cemented-soft strength was very small.