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Open Access

ARTICLE

Influence of Polyaluminum Chloride Residue on the Strength and Microstructure of Cement-Based Materials

Ping Xu1,*, Zhiwei Zhang1, Zhenguo Hou2,3, Mankui Zheng1, Jin Tong1
1 School of Civil Engineering, Henan Polytechnic University, International Joint Research Laboratory of Henan Province for Underground Space Development and Disaster Prevention, Jiaozuo, 454003, China
2 China Construction Seventh Engineering Division Co., Ltd., Zhengzhou, 450004, China
3 China Construction Seventh Engineering Division Co., Ltd., General Contracting Company, Zhengzhou, 450004, China
* Corresponding Author: Ping Xu. Email: email

Fluid Dynamics & Materials Processing https://doi.org/10.32604/fdmp.2023.046183

Received 21 September 2023; Accepted 15 December 2023; Published online 06 February 2024

Abstract

In this paper, cement and dechlorinated Polyaluminum Chloride Residue (PACR) have been used to prepare a net slurry and mortar specimens. Two hydration activity indicators have been used to quantitatively analyze the dechlorinated PACR hydration activity. In particular, the effect of dechlorinated PACR content on the compressive strength of mortar has been assessed by means of compressive strength tests. Moreover, X-ray diffraction (XRD) and scanning electron microscopy (SEM) have been employed to observe the microstructure of the considered hydration products. The following results have been obtained. The 28th day activity index of the dechlorinated PACR is 75%, and therefore it meets the criterion for the use of active admixture. The increase in the content of the dechlorinated PACR tends to reduce the compressive strength of mortar specimens, however, it is beneficial to its later strength growth. When the content is not greater than 10%, the strength remains unchanged, otherwise, it decreases. The PACR does not form a new crystalline phase in the cement slurry, and the dechlorinated PACR remains active until the age of the 28th day. The inclusion of the PACR mainly deteriorates the early strength of the cement slurry, but it promotes the production of hydration products in the cement slurry after the 7th day.

Keywords

Dechlorinated polyaluminum chloride residue; activity index; strength; microstructure; hydration product

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