A method for calculating the carbonation degree of calcium–silicate–hydrate
Source abstract
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.
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Research context
OpenAlex topics: Concrete and Cement Materials Research · Concrete Properties and Behavior · Innovative concrete reinforcement materials
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Civil Engineering, Ludong University, Yantai, China; Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, China (corresponding author: )
School of Materials Science and Engineering, Southeast University, Nanjing, China; Jiangsu Key Laboratory for Construction Materials, Southeast University, Nanjing, China
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