Effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature

Effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature
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高温下镁对水合硅酸钙结构和化学组成的影响

DOI:
10.1016/j.conbuildmat.2019.117925
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发表时间:
2020-04
影响因子:
7.4
通讯作者:
Chen Wei
Chen Wei
中科院分区:
工程技术1区
文献类型:
--
作者:
Tang Yanjie;Chen Wei

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本文旨在研究镁对高温下水化硅酸钙的结构和化学组成的影响。以氧化镁、硅灰和氧化钙为原料,制备了(Ca~(2+)、Mg~(2+))/Si摩尔比为0.8的氧化镁改性C-S-H凝胶。用扫描电子显微镜、透射电子能谱、X射线衍射仪、傅立叶变换红外光谱、热重-差示扫描量热仪和核磁共振仪对所得固体进行了表征。结果表明,当镁硅摩尔比降至0.4时,M-S-H向C-S-H转变。透射电子能谱观察到镁、硅、钙元素的集中分布,表明可能形成了新的水化硅酸钙镁相(M-C-S-H)。
This paper aims to investigate the effect of magnesium on the structure and chemical composition of calcium silicate hydrate at elevated temperature. Magnesium oxide, silica fume and calcium oxide were used in the preparation of MgO modified C–S–H gels with (Ca + Mg)/Si molar ratio of 0.8. The obtained solids were characterized with SEM, TEM-EDS, XRD, FT-IR, TG-DSC and29Si NMR. The results show that the transformation from M–S–H to C–S–H occurs when Mg to Si molar ratio decreases to 0.4. A concentrated distribution of Mg, Si and Ca elements is observed with TEM-EDS, indicating that a new phase magnesium calcium silicate hydrate (M–C–S–H) is possibly formed.
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