聚环氧琥珀酸对水泥浆体铝离子配位结构的影响机理

发布时间：2018-05-11 09:37

本文选题：聚环氧琥珀酸 + 水泥浆体　；参考：《功能材料》2017年03期

【摘要】：采用XRD、29Si和27 Al NMR等测试手段,研究了聚环氧琥珀酸对水泥浆体铝离子配位结构的影响机理。结果表明,聚环氧琥珀酸能阻止硅酸盐矿物水化,抑制掺杂在Alite和Belite矿中的四配位铝(Al[4])参与水化,不利于铝氧四面体进入到C-S-H结构取代硅氧四面体,促使浆体中Al[4]向六配位铝(Al[6])转化。聚环氧琥珀酸掺量存在一个最佳值,掺量较小时,聚环氧琥珀酸与水泥浆体中Ca2+键合后带正电荷,极易与SO42-结合形成螯合物,促使AFt、AFm中Al[6]向TAH(Third aluminum hydrate)中Al[6]转化,达到抑制AFt、AFm结晶的作用;当掺量较大时,聚环氧琥珀酸通过Ca2+桥连另外的聚环氧琥珀酸形成环状结构,降低了聚环氧琥珀酸固化SO42-的程度,进而使大量TAH中Al[6]逐步向AFm、AFt中Al[6]转化,反而促进了AFt结晶形成。
[Abstract]:The effect of polyepoxysuccinic acid on the coordination structure of aluminum ions in cement paste was studied by means of XRD-29Si and 27Al NMR. The results show that polyepoxysuccinic acid can prevent the hydration of silicate minerals and inhibit the hydration of tetrahedral Al [4] doped in Alite and Belite ore, which is not conducive to the entry of oxide-aluminum tetrahedron into C-S-H structure to replace the Si-O tetrahedron. The transformation of Al [4] into hexagonal Al [6] in slurry is promoted. There is an optimum value for the addition of polyepoxysuccinic acid. When the content is small, the Ca2 bond in cement paste is positively charged, and it is easy to form chelates with so _ 42-, which promotes the transformation of Al [6] from AFT-AFM to Al [6] in TAH(Third aluminum hydrate. It can inhibit the crystallization of AFT-AFM, and when the content is high, the polyepoxysuccinic acid connects with the other polyepoxysuccinic acid through Ca2 bridge to form a ring structure, which reduces the degree of curing so _ 4 ~ (2-) by polyepoxysuccinic acid. Thus, a large amount of Al [6] in TAH was gradually transformed to Al [6] in AFM / AFT, which promoted the crystallization of AFt.
【作者单位】：华北理工大学材料科学与工程学院;河北省无机非金属材料重点实验室;唐山市墙体材料革新办公室;湖北大学材料科学与工程学院;
【基金】：国家重点基础研究发展计划(973计划)资助项目(2015CB655101) 国家自然科学基金资助项目(51302070) 河北省自然科学基金资助项目(E2016209283) 河北省科技计划资助项目(16273706D) 唐山市科技计划资助项目(15130249a)
【分类号】：TQ172.1

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