Effect of Zeolite Powder on Hydration Behavior of Calcium Sulfoaluminate Cement

Abstract

Abstract: The effects of zeolite powder on fluidity, setting time and compressive strength of calcium sulfoaluminate cement pastes were studied, and the mechanism of zeolite powder in the hydration behavior of calcium sulfoaluminate cement was analyzed by autogenous shrinkage, electrical resistivity and XRD. The results show that the fluidity of the cement paste decreases obviously with the addition of zeolite powder, and the setting time increases significantly, and then increases slowly with the increase of zeolite powder. When the zeolite powder mass content is from 5% to 15%, the compressive strength of hardened cement paste at 1 d, 3 d and 7 d increases significantly. When the zeolite powder mass content is 10%, the compressive strength of cement paste at 3 d, 7 d and 28 d increases by 21.6%, 13.9% and 5.4%, respectively, compared with the control group. After adding zeolite powder, the electrical resistivity of cement paste at 24 h increases significantly, and the autogenous shrinkage of hardened cement paste decreases at 7 d. At the same age, the autogenous shrinkage of hardened cement paste decreases with the increase of zeolite powder. XRD analysis shows that the addition of zeolite powder effectively promotes the hydration of calcium sulfoaluminate cement, and is beneficial to the formation of ettringite at 1 d, 3 d and 28 d ages.

Key words: zeolite powder, calcium sulfoaluminate cement, hydration, compressive strength, electrical resistivity, ettringite

CLC Number:

TU528

GUI Ruoming, LIAO Yishun, HUANG Haoran. Effect of Zeolite Powder on Hydration Behavior of Calcium Sulfoaluminate Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(7): 2138-2144.

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