碱激发偏高岭土/矿渣复合胶凝体系反应水平 及影响因素分析研究
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1.长沙理工大学土木学院 长沙理工大学南方地区桥梁长期性能提升技术国家地方联合工程实验室;2.长沙理工大学土木学院;3.路易斯安那州立大学建筑土木与环境工程系

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Analysis of Reaction Level and Factors of Alkali Activated Metakaolin/GGBFS
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1.Changsha University of Science and Technology;2.Louisiana State University

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    摘要:

    为研究碱激发偏高岭土/矿渣复合胶凝体系中各原料的反应水平,需分析体系中不同凝胶的含量。本文考察了不同原料和反应产物在不同pH值盐酸中的溶解率,并通过XRF、XRD和FT-IR等方法分析原料偏高岭土及偏高岭土地聚物的盐酸不溶物,发现偏高岭土在pH=0时的盐酸溶液中几乎不溶解,偏高岭土地聚物在pH=0~2时的盐酸不溶物即是偏高岭土,从而可根据不溶物量得出偏高岭土的地质聚合反应水平;矿渣在本文碱激发条件下几乎完全反应。碱激发偏高岭土/矿渣复合胶凝材料的酸溶试验表明,矿渣的掺入多数情况下提高了偏高岭土的地质聚合反应水平;本文试验条件下,矿渣掺量一定时偏高岭土反应水平随激发剂模数增大而降低,随液固比增大而提高,低矿渣掺量时增大液固比所产生的促进更显著;低激发剂浓度时,偏高岭土反应水平随矿渣掺量增加而提高;高激发剂浓度时,随矿渣掺量增加先提高后降低,对应偏高岭土最高反应水平的矿渣掺量逐渐减小。

    Abstract:

    In order to study the reaction level of the alkali activated metakaolin/ GGBFS system, the content of different gels in the metakaolin/GGBFS system need to be determined. In this paper, the dissolution rates of alkali activated metakaolin/GGBFS in hydrochloric acid with various pH values were investigated, and XRF, XRD and FTIR were used to analyze the raw 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 concentration is low, while increase first and then decrease when the activator concentration is relative high. The GGBFS content corresponding to the highest reaction level of metakaolin is gradually reduced with increase in activator concentration.

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  • 收稿日期:2019-06-14
  • 最后修改日期:2019-07-16
  • 录用日期:2019-08-02
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