1. Temperature dependence of structural build-up and its relation with hydration kinetics of cement paste.
- Author
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Huang, Hai, Huang, Tingjie, Yuan, Qiang, Zhou, Dajun, Deng, Dehua, and Zhang, Lei
- Subjects
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CEMENT admixtures , *DISCONTINUOUS precipitation , *HYDRATION kinetics , *STRUCTURAL analysis (Engineering) , *TEMPERATURE effect - Abstract
Highlights • The effect of temperature on the structural buildup of cement pastes with various mineral admixtures was studied. • The hydration kinetics of cement paste was studied by boundary nucleation and growth model. • The relation between hydration kinetics and structural buildup was analyzed. Abstract The temperature dependence of structural build-up is of great importance to some new concrete technologies, such as 3D printing and slip-form casting concrete. In this paper, the structural build-up of cement paste with various mineral admixtures, characterized by the growth of static yield stress, were measured at 10, 20 and 40 °C. They were related with the calorimetric curves of cement paste at various temperatures. Nucleation kinetic (K N) and growth kinetic (K G) were introduced to analyze the hydration dynamics. The results showed that the addition of fly ash and slag were unfavorable for the structural build-up of cement paste at 10 and 20 °C, however, a favorable phenomenon was observed at 40 °C. The additions of nano-CaCO 3 or nano-SiO 2 had positive effect on structural build-up at all temperatures. The incorporation of silica fume had negative effect on structural build-up at 10 °C, while positive effect at 20 and 40 °C. Both the K N and K G played important roles on the structural build-up rate of cement paste. K G contributed more to the temperature dependence of structural build-up than K N. [ABSTRACT FROM AUTHOR]
- Published
- 2019
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