Early hydration and setting process of cement-hydrated lime system at different curing temperatures

International Conference on Manufacturing Technology, Materials and Chemical Engineering

材料科学;化学工业

Zhang, Hui^1 ; Yang, Zhenghong^1^2 ; Su, Yufeng^1^2

School of Materials Science and Engineering, Tongji University, Shanghai

201804, China^1

Key Laboratory of Advanced Civil Engineering Materials of Ministry of Education, Tongji University, Shanghai

201804, China^2

关键词: Curing temperature;    Freeze dry;    Hydration process;    Hydration products;    Setting time;    Time resolution;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/592/1/012014/pdf
DOI  :  10.1088/1757-899X/592/1/012014

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

This paper investigated the hydration and setting process of the cement-hydrated lime system at the temperatures of 30°C, 40°C and 50°C with Vicat test, FTIR and TG-DTA. To obtain sufficient time resolution a freeze-dry procedure is used to instantaneously cease the hydration process. The results illustrate that a shorter initial and final setting time can be observed with a higher curing temperature. The thickening time is the same at the curing temperatures of 40°C and 50°C and is half as that at 30°C. The dissolution of C3S, the formation of C-S-H and the hydration product of C4AH13 from the reaction of C3A and Ca(OH)2 are the main causes of the thickening of the cement-lime system.