Influence of borax and citric acid on the hydration of calcium sulfoaluminate cement |
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Authors: | Yueyang Hu Weifeng Li Suhua Ma Xiaodong Shen |
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Institution: | 1.College of Materials Science and Engineering,Nanjing Tech University,Nanjing,China;2.State Key Laboratory of Materials-Oriented Chemical Engineering,Nanjing,China |
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Abstract: | The hydration of calcium sulfoaluminate cement in the presence of borax and citric acid has been studied using isothermal calorimetry, X-ray diffraction, thermogravimetric analysis, Fourier transfer infrared spectrometry and mercury intrusion porosimetry. The results suggest that the formation of complex between calcium and citrate in the solution adsorbed on the solid surface delayed the C4A3 \( \bar{S} \) and anhydrite dissolution and AFt nucleation. At the same time, the presence of borate replaced sulfate anion in ettringite (AFt) to form B-AFt. These reactions have an effect on the setting times and the mechanical strength values. The setting times of the calcium sulfoaluminate cement increased when the mineral admixtures increased in the cement. The effect of borax and citric acid on the strength development at different hydration stages presented different results, namely a decreased strength in an early stage and an increased strength at 3 and 28 days. |
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