The mechanism of hydration of MgO-hydromagnesite blends

被引：133

作者：

Kuenzel, C. ^{[2
]}

Zhang, F. ^{[2
]}

Ferrandiz-Mas, V. ^{[1
]}

Cheeseman, C. R. ^{[2
]}

Gartner, E. M. ^{[2
]}

机构：

[1] Univ Bath, Dept Architecture & Civil Engn, Bath BA2 7AY, Avon, England

[2] Imperial Coll London, Dept Civil & Environm Engn, South Kensington Campus, London SW7 2AZ, England

来源：

CEMENT AND CONCRETE RESEARCH | 2018年 / 103卷

基金：

英国工程与自然科学研究理事会;

关键词：

MgO; Cement; Hydration; Hydromagnesite; Artinite; Brucite; MAGNESIUM-OXIDE; THERMAL-DECOMPOSITION; TEMPERATURE; KINETICS; SYSTEM; WATER;

D O I：

10.1016/j.cemconres.2017.10.003

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

The hydration of reactive periclase (MgO) in the presence of hydromagnesite (mg(5)(CO3)(4)(OH)(2)center dot 4H(2)O) was investigated by a variety of physical and chemical techniques. Hydration of pure MgO-water mixtures gave very weak pastes of brucite (Mg(OH)(2)), but hydration of MgO-hydromagnesite blends gave pastes which set quickly and gave compressive strengths of potential interest for construction applications. The strengths of the blends increased with hydration time at least up to 28 days, and were not significantly decreased by increasing the hydromagnesite content up to 30%. Raman spectroscopy suggests that an amorphous phase, of composition between that of brucite, hydromagnesite and water, may form. Small amounts of calcite also form due to CaO in the MgO source. Thermodynamic calculations imply that the crystalline phase artinite (MgCO3 center dot Mg(OH)(2)center dot 3H(2)O) should be the stable product in this system, but it is not observed by either XRD or FTIR techniques, which suggests that its growth may be kinetically hindered.

引用

页码：123 / 129

页数：7

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