碱激发偏高岭土/矿渣复合胶凝体系反应水平及影响因素分析
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国家自然科学基金资助项目(51878068,51578078)


Analysis of Reaction Level and Factors of Alkali Activated Metakaolin/GGBFS
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    摘要:

    考察了碱激发偏高岭土/矿渣复合胶凝体系中各原料和反应产物在不同pH值盐酸溶液中的溶解率,并通过X射线荧光光谱(XRF)、X射线衍射(XRD)和傅里叶变换红外光谱(FTIR)等测试方法分析了偏高岭土及其碱激发硬化浆体的酸溶剩余物.结果表明:偏高岭土在pH=0的盐酸溶液中几乎不溶解,碱激发偏高岭土的酸溶剩余物(盐酸溶液pH=0~2)为偏高岭土,由此得到偏高岭土的地质聚合反应水平(以下简称反应水平);矿渣在碱激发条件下几乎完全反应,其在多数情况下可提高偏高岭土的反应水平;当矿渣掺量一定时,偏高岭土的反应水平随碱激发剂模数的增大而降低,随液固比的增大而提高,且低矿渣掺量条件下,增大液固比所产生的促进作用更加显著;低碱激发剂质量分数条件下,偏高岭土反应水平随矿渣掺量的增加而提高;高碱激发剂质量分数条件下,偏高岭土的反应水平随矿渣掺量的增加先升后降,且与偏高岭土最高反应水平相对应的矿渣掺量逐渐减小.

    Abstract:

    The dissolution rates of alkali activated metakaolin/GGBFS in hydrochloric acid with various pH values were investigated, and X ray fluorescence(XRF), X ray diffraction(XRD) and Fourier transform infrared(FTIR) were used to analyze the metakaolin and the hydrochloric acid insoluble of metakaolin based geopolymer. It is found that the hydrochloric acid insoluble of metakaolin based geopolymer is metakaolin which is unreacted when the pH value of hydrochloric acid is from 0 to 2 Thus the geopolymerization reaction level of metakaolin can be determined based on the content of hydrochloric acid insoluble. Under the present alkali activation environment the hydration reaction of GGBFS is nearly completed. The acid dissolution tests of alkali activated metakaolin/GGBFS show that the addition of GGBFS increases the geopolymerization level of metakaolin in most cases. With a certain GGBFS content, the reaction level of metakaolin decreases with the increase in activator modulus, and increases with the increase in liquid solid ratio of system, of which promotion impact is more significant with a fewer GGBFS content. The reaction level of metakaolin increases with the increase in GGBFS content when the activator mass fraction is low, on the other hand, when the activator mass fraction is relative high. The GGBFS content corresponding to the highest reaction level of metakaolin is gradually reduced with increase in activator mass fraction.

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彭晖,李一聪,罗冬,刘扬,蔡春声.碱激发偏高岭土/矿渣复合胶凝体系反应水平及影响因素分析[J].建筑材料学报,2020,23(6):1390-1397

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  • 收稿日期:2019-06-14
  • 最后修改日期:2019-07-11
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  • 在线发布日期: 2021-01-04
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