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Advances in Materials Science and Engineering
Volume 2017 (2017), Article ID 8906708, 10 pages
https://doi.org/10.1155/2017/8906708
Research Article

The Performance and Mechanism Analysis of Cement Pastes Added to Aluminum Sulfate-Based Low-Alkali Setting Accelerator

1Changjiang River Scientific Research Institute of Changjiang Water Resources Commission, Wuhan 430010, China
2State Key Laboratory of Silicate Materials for Architecture, Wuhan University of Technology, Wuhan 430070, China

Correspondence should be addressed to Xingdong Lv

Received 30 June 2016; Revised 17 October 2016; Accepted 24 October 2016; Published 31 January 2017

Academic Editor: Sverak Tomas

Copyright © 2017 Xingdong Lv et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

We proposed a type of low-alkali liquid state setting accelerator, named HLSA; it was environmentally friendly product. To investigate the temperature adaptation and cement flexibilities of HLSA, the setting time and strength development properties of cement with HLSA were discussed in this paper. The effects of HLSA on hydration process, hydration products, and microstructure were studied by means of X-ray diffraction (XRD), thermogravimetric analysis (TGA), scanning electron microscope (SEM), and mercury intrusion porosimetry (MIP). The results show that four typical 42.5-grade ordinary Portland cement types with 6–8% HLSA could satisfy the first-grade requirements according to JC477-2005 even at a lower temperature (e.g., 10°C). Further, the percentage ratio of 28 d compressive strength of cement with 6–8% HLSA was over 90%; the XRD diffraction peak of AFt integrated area of cement with 7% HLSA was 3818 at 5 min of hydration; SEM observation revealed that AFt crystals were filled in the pore of cement at 28 d of hydration; the temperature adaptation and cement flexibilities of HLSA were excellent; the cement with HLSA coagulating in a short time attributed to promoting the formation of abundant AFt and the hydration of C3S.