A method for calculating the carbonation degree of calcium-silicate-hydrate

被引：11
|
作者：
Shen, Qizhen [1 ,2 ]
Pan, Ganghua [2 ,3 ]
Bao, Bingfeng [2 ,3 ]
机构：
[1] Ludong Univ, Sch Civil Engn, Yantai, Peoples R China
[2] Southeast Univ, Jiangsu Key Lab Construct Mat, Nanjing, Jiangsu, Peoples R China
[3] Southeast Univ, Sch Mat Sci & Engn, Nanjing, Jiangsu, Peoples R China
来源：
ADVANCES IN CEMENT RESEARCH | 2018年 / 30卷 / 09期
基金：
中国国家自然科学基金;
关键词：
C-S-H; NMR; -; spectroscopy; paste; C-S-H; SI-29 MAS NMR; CEMENT PASTE; MICROSTRUCTURE CHANGES; CONCRETE CARBONATION; NANOINDENTATION; KINETICS; AL-27; C-13;
D O I：
10.1680/jadcr.16.00086
中图分类号：
TU [建筑科学];
学科分类号：
0813 ;
摘要：
The carbonation degree of calcium-silicate-hydrate (CSH) was quantitatively characterised using a direct test method. Nuclear magnetic resonance (NMR) and thermogravimetric methods were used to study different depths of cement paste with a water/cement ratio of 0.35 after 28 d of carbonation. Firstly, based on the hydration and carbonation reaction equations of the CSH, the variation of Ca2+ can be obtained, and then according to the variation of Ca2+ to calculate the carbonation degree of CSH. Secondly, the parameter I(Q(2))/I(Q(1)) was determined to characterise the structural change of the CSH quantitatively. Finally, the relationship between the CSH carbonation degree and I(Q(2))/I(Q(1)) was analysed. The results showed that the carbonation degree of CSH can be expressed as the ratio of the molar content of calcium carbonate carbonated by CSH and the molar content of Ca2+ in the initial CSH. A good linear relationship was found between the value of I(Q(2))/I(Q(1)) and the CSH carbonation degree. Therefore, the NMR method can be used to determine the carbonation degree of CSH.
引用
收藏
页码：427 / 436
页数：10
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