干湿循环对GGBS+MgO改良黏土强度影响的试验研究

薄煜琳; 杜延军; 魏明俐; 刘辰阳

干湿循环对GGBS+MgO改良黏土强度影响的试验研究 English Version

东南大学岩土工程研究所，江苏南京 210096

基金项目: 国家自然科学基金项目（51278100）；江苏省自然科学基金项目（BK2012022）

详细信息

作者简介:
薄煜琳(1990- )，女，硕士研究生，主要从事环境岩土方面的研究。E-mail: boyulin.com@163.com。

中图分类号: TU411
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出版历程
- 收稿日期: 2013-03-01
- 发布日期: 2013-07-18

Effect of wetting-drying cycles on strength properties of ground granulated blast-furnace slag and magnesium oxide-stabilized soft clay

Institute of Geotechnical Engineering, Southeast University, Nanjing 210096, China

摘要

摘要: 将MgO作为激发剂掺入GGBS制备GGBS+MgO改良黏土，同时制备等掺量水泥改良黏土作为参照样。通过无侧限抗压强度试验，研究干湿循环对GGBS+MgO改良黏土强度的影响。测试GGBS+MgO改良黏土在干湿循环后的无侧限抗压强度、pH值、变形模量和质量损失率并与标准养护改良黏土进行对比，分析干湿循环级数对强度特性和pH值的影响规律。结果表明：标准养护GGBS+MgO改良黏土强度约为水泥改良黏土的1.5倍，pH值较水泥改良黏土低约0.2；干湿循环后，GGBS+MgO改良黏土强度随干湿循环级数降低较快且破坏程度逐渐增大，pH值降低明显。与水泥改良黏土相比，GGBS+MgO改良黏土抗干湿能力较差。
- 黏土 /
- 水泥 /
- GGBS+MgO /
- 固化稳定 /
- 耐久性
Abstract: In this study, MgO is added to GGBS as an activator and is used to stabilize kaolin clay. For the purpose of comparison, cement is used as another type of binder to stabilize kaolin clay. The effect of wetting-drying cycles on the durability of the stabilized soils is investigated. The results of unconfined compression tests show that wetting-drying cycle has more evident effect on GGBS+MgO stabilized soils. The change rules of unconfined compressive strength, pH, secant modulus, and mass loss with wetting-drying cycle and standard curing time are discussed. It is found that the values of unconfined compressive strength of GGBS+MgO-stabilized soils are 1.5 times those of cement-stabilized soils under the standard curing condition. pH of GGBS+MgO-stabilized soils is slightly lower than that of the cement-stabilized soils. Upon wetting-drying cycles, the unconfined compressive strength of GGBS+MgO-stabilized soils decreases more rapidly than that of the cement-stabilized soils. pH of both GGBS+MgO- and cement-stabilized soils decreases with the increasing wetting-drying cycles. It is found that the degree of integrity of GGBS+MgO-stabilized soils is lower than that of the cement-stabilized soils. It is concluded that compared with that of the cement-stabilized soils, the wetting-drying durability of the GGBS+MgO-stabilized clay is weaker.
- soft clay /
- cement /
- GGBS+MgO /
- stabilization/solidification /
- durability

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