A method for calculating the carbonation degree of calcium–silicate

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

Published:2018-10 Issue:9 Volume:30 Page:427-436
ISSN:0951-7197
Container-title:Advances in Cement Research
language:en
Short-container-title:Advances in Cement Research

Author:

Shen Qizhen¹,Pan Ganghua²,Bao Bingfeng²

Affiliation:

1. School of Civil Engineering, Ludong University, Yantai, China; Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, China (corresponding author: )

2. School of Materials Science and Engineering, Southeast University, Nanjing, China; Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, China

Abstract

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(Q2)/I(Q1) was determined to characterise the structural change of the CSH quantitatively. Finally, the relationship between the CSH carbonation degree and I(Q2)/I(Q1) 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(Q2)/I(Q1) and the CSH carbonation degree. Therefore, the NMR method can be used to determine the carbonation degree of CSH.

Publisher

Thomas Telford Ltd.

Subject

General Materials Science,Building and Construction

Link

https://www.icevirtuallibrary.com/doi/pdf/10.1680/jadcr.16.00086

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