Research on the Influence and its Mechanism of an Alkali-Free Hardening Accelerator on the Performance of Concrete
The influence of an alkali-free concrete hardening accelerator on the performance of the concrete was studied, the hydration heat and the rate of the hydration heat the corresponding cement with and without the accelerator addition were tested by the calorimeter, the hydrates of them were analyzed by X-ray diffraction (XRD), and the acclerating mechanisms were analysied in this paper. The results show that the compression strength of the tested concrete (with the accelerator addition) have be enhanced repectively by 43%, 47%, 39% and 31% at the age of 1days, 3days, 7days and 28days compared with those of the controlled concrete (without accelerator addition), the hydration rate and the amount of the hydrates of cement with the accelerator have also be increased significantly at different hydration time. The reason for causing the above results is because of the role played by Calcium formate, Crystal embryo and Ferric sulfate together.
Hui Wu, Xiao-Qian Qian, Chong-zhi Li and Fei Li
Z. G. Gao et al., "Research on the Influence and its Mechanism of an Alkali-Free Hardening Accelerator on the Performance of Concrete", Key Engineering Materials, Vol. 477, pp. 170-174, 2011