吕擎峰,何俊峰,王子帅,等. 2020.黏土矿物与碱激发地聚物的相互作用机理[J].工程地质学报,28(6):1205-1212. doi:10.13544/j.cnki.jeg.2019-547. DOI: 10.13544/j.cnki.jeg.2019-547
    引用本文: 吕擎峰,何俊峰,王子帅,等. 2020.黏土矿物与碱激发地聚物的相互作用机理[J].工程地质学报,28(6):1205-1212. doi:10.13544/j.cnki.jeg.2019-547. DOI: 10.13544/j.cnki.jeg.2019-547
    Lü Qingfeng, He Junfeng, Wang Zishuai, et al. 2020. Study on interaction mechanism between clay minerals and alkali activated geopolymers[J]. Journal of Engineering Geology, 28(6): 1205-1212. doi: 10.13544/j.cnki.jeg.2019-547.
    Citation: Lü Qingfeng, He Junfeng, Wang Zishuai, et al. 2020. Study on interaction mechanism between clay minerals and alkali activated geopolymers[J]. Journal of Engineering Geology, 28(6): 1205-1212. doi: 10.13544/j.cnki.jeg.2019-547.

    黏土矿物与碱激发地聚物的相互作用机理

    STUDY ON INTERACTION MECHANISM BETWEEN CLAY MINERALS AND ALKALI ACTIVATED GEOPOLYMERS

    • 摘要: 土体固化的核心问题之一就是使用适宜的固化剂固化黏土矿物。通过扫描电镜(SEM)、傅里叶红外光谱(FTIR)、X射线衍射(XRD)以及X射线光电子能谱(XPS)等试验方法,研究不同碱含量下碱激发地聚物固化的蒙脱石、伊利石和高岭土的微观结构、物质组成及物理化学反应过程,探究碱激发地聚物与黏土矿物之间的相互作用机理。研究结果表明:黏土矿物经碱激发地聚物固化后,由松散颗粒转变为块状致密结构;随着地聚物中碱含量的增加,Si、Al及Ca元素电子结合能下降;蒙脱石在衍射角为5°左右(001)峰形右移,层间距减小;蒙脱石吸附水含量减小,亲水能力下降,矿物活性被限制。

       

      Abstract: As the most active component of particles, clay minerals play an important role in the physical and mechanical properties of soil, such as liquid plasticity, strength and expansibility. One of the core problems of soil solidification is the use of suitable curing agents to solidify the clay minerals. This paper carries out scanning electron microscopy(SEM), Fourier infrared spectroscopy(FTIR), X-ray diffraction(XRD), and X-ray photoelectron spectroscopy(XPS), studies the microstructure, material composition and physicochemical reaction process of clay minerals solidified by alkali-activated geopolymers with different alkali dosages, and discussed the interaction mechanism of alkali-activated geopolymers and clay minerals. The results show that Alkali activated geopolymers can solidify clay minerals well. The clay minerals are transformed from loose particles to bulky dense structure after solidified by alkali-activated geopolymers. With the alkali dosage of geopolymers increases, the electronic binding energy of Si, Al, and Ca elements decreases. The diffraction peak of montmorillonite shifts to the right(001) at a diffraction angle of about 5°, and the interlayer distance is decreased. The absorbed water content and hydrophilic capacity of montmorillonite are decreased, and the mineral activity is limited.

       

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