Solution calorimetry to assess effects of water-cement ratio and low temperature on hydration heat of cement

• Published in: Construction & building materials 2021-02, Vol.269, p.121222, Article 121222
• Main Authors: Dai, Jinpeng, Wang, Qicai, Lou, Xuyu, Bao, Xueying, Zhang, Bo, Wang, Jianqiang, Zhang, Xin
• Format: Article
• Language: English
• Subjects: Hydration heat; Low temperature; Modeling; Solution calorimetry; Water-cement ratio
• ISSN: 0950-0618; 1879-0526
• DOI: 10.1016/j.conbuildmat.2020.121222

•Studied the influence of water-cement ratio on hydration heat of cement paste.•Studied the influence of low curing temperature on hydration heat of cement paste.•Two expressions are proposed to predict the hydration heat of cement pastes. This study investigated the effects of the water-cement ratio and low temperature on the hydration heat of cement using solution calorimetry. When curing at 20 °C, a lower water-cement ratio resulted in a higher cumulative hydration heat and hydration heat evolution rate at 24 h, but subsequently decreased. A lower water-cement ratio led to a lower cumulative hydration heat when curing at 5 °C and 0 °C. A higher water-cement ratio caused lower cumulative hydration heat when curing at −5 °C. The cumulative hydration heat of the cement paste increased with the curing temperature, and the influence of the negative temperature on the cumulative hydration heat of the cement paste increased with the water-cement ratio. The compound exponential model was used to predict the hydration heat of cement paste maintained above 0 °C. The results obtained by the logarithmic function model are in good agreement with the experimental results for curing at negative temperature.