土工基础

›› 2018, Vol. 32 ›› Issue (6): 633-636.

• 工程实录 • 上一篇    下一篇

水泥加固红粘土的强度特征及微观结构分析

龚子龙1，2，孙刚臣1，2，胡跃发1，2，刘 锋1   

  1. （1.广西岩土力学与工程重点实验室，广西 桂林 541004；2.桂林理工大学 建筑与土木工程学院，广西 桂林 541004）
  • 收稿日期:2018-01-12 修回日期:2018-03-13 出版日期:2018-12-20 发布日期:2018-12-21
  • 通讯作者: 孙刚臣（1977-），讲师.研究方向为岩土工程。
  • 作者简介:龚子龙（1992-），男，硕士研究生，研究方向为岩土工程。
  • 基金资助:

    广西自然科学基金项目(2017GXNSFAA198238) 

Strength Characteristics of Red Clay Reinforced by Cement Microstructure Analysis

GONG Zilong1, SUN Gangchen2, HU Yuefa2, LIU Feng1   

  1. (1.Guangxi Key Laboratory of Geomechanics and Geotechnical Engineering, Guilin 541004；
    2.College of Civil Engineering and Architecture, Guilin University of Technology, Guilin 541004)
  • Received:2018-01-12 Revised:2018-03-13 Online:2018-12-20 Published:2018-12-21

摘要： 为了深入了解水泥对桂林红粘土的加固效果，通过对不同水泥掺量和不同龄期的红粘土进行无侧限抗压强度试验和扫描电子显微镜（SEM）试验，分析了水泥对红粘土强度及微观结构的影响。结果表明：加入水泥后红粘土表面生成细微的颗粒和针状物，这些颗粒和针状物填充、连结、胶结土体，形成了水泥石骨架，提高了水泥土的强度。并且水泥掺入量小于20%时，水泥掺入量增加会加速水泥石骨架的形成，提高水泥土的早期强度，水泥土的强度会随龄期的增长不断提高。当水泥掺入量大于20%时，水泥土在早期已生成水泥石骨架，随龄期的增长，强度提高不大。

关键词: 龄期, 水泥掺入量, 强度, 微观结构

Abstract: To investigate the effect of cement content on the Guilin Red Claycement mixtures, an extensive laboratory test program was developed. Mixture samples with different cement content and age on the strength and microstructure changes were tested with the unconfined compressive strength and analyzed with scanning electronic microscope (SEM). The results indicate that the clay particles formed the granular and needle like materials after adding cement. These soilcement reaction products can fill, connect and cement clay particles and formed harder soil aggregate, therefore, improve the strength of soilcement mixture. When the cement content is less than 20%, the increase of cement content can accelerate the form of harder aggregate and increase the early strength of mixtures. The strength of the mixture increases with the curing age. When the cement content is greater than 20%, the harder aggregate has formed with certain amount of cement and therefore, the increase of cement content will not significantly increase the strength of soilcement mixtures.

Key words: Curing Age, Cement Content, Strength, Microstructure