| 摘要: |
| 采用无侧限抗压强度（UCS）试验、X射线衍射（XRD）和扫描电子显微镜（SEM），研究了地聚物对软黏土的固化和UCS提升效果，分析了地聚物碱激发剂模数、掺量对软黏土固化效果和UCS提升的影响，并探讨了其固化机理．结果表明：碱激发剂模数为12时，地聚物固化软黏土的UCS得到大幅提高，最大值为437MPa；碱激发剂掺量的增加对地聚物固化软黏土的早期强度提升影响显著，但对14、28d强度影响较小，当掺量超过50%时，强度提升效能降低；地聚物固化软黏土中同时生成了水化硅铝酸钠（N A S H）、水化硅酸钙（C S H）、碳酸钙晶体和莫来石晶体，土颗粒间的孔隙得到填充，凝胶的胶结作用提高了土体的整体性.基于试验数据给出了28d龄期内地聚物固化软黏土强度提升的评价公式. |
| 关键词: 软黏土 地聚物 固化土 无侧限抗压强度 微观机理 |
| DOI：103969/j.issn1007 9629202002019 |
| 分类号: |
| 基金项目:水利部技术示范项目（SF 201735）；江苏特聘教授人才计划；上海城市建设设计研究总院科研项目（CK2017073A） |
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| Mechanical Behaviour of Geopolymer Stabilized Clay and Its Mechanism |
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YU Jiaren1, CHEN Yonghui1, CHEN Geng1, TANG Tianhua2, GUO Yang3
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1.Key Laboratory of Ministry of Education for Geomechanics and Embankment Engineering, Hohai University,Nanjing 210098, China;2.Shanghai Nanhui Huiji Construction and Investment Co., Ltd., Shanghai 201300, China;3.Shanghai Puxing Road and Bridge Construction Co., Ltd., Shanghai 200120, China
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| Abstract: |
| The unconfined compression strength(UCS) test, X ray diffraction(XRD) and scanning electron microscope(SEM) were used to investigate the stabilization effect of geopolymer on clay. The effect of activator modulus ratio and content on the strength development of geopolymer stabilized clay was studied and its micromechanism was analyzed. The results show that geopolymer stabilized clay has a rapid strength gain during curing. The highest value of UCS of 437MPa is observed at activator modulus ratio is 12. The addition of activator content increases the short term strength of geopolymer stabilized clay but has a lower impact on the 14d and 28d strength. When activator content exceeds 50%, strength incensement effect is much lower. Furthermore, N A S H gel, C S H gel, calcium carbonate crystal and mullite crystal are observed in geopolymer stabilized clay. The pores are filled well and the clay is enhanced by geopolymer. Finally, the proposed strength enhancement prediction model is established based on the test results. |
| Key words: clay geopolymer soil stabilization unconfined compression strength(UCS) micromechanism |
