Effect of SO42-/C3A Ratio on Formation of Thaumasite in Monomineral C3S Cement Paste

Abstract

Abstract: Thaumasite sulfate attack (TSA) is a sulfate attack with thaumasite as the product, and the formation process of thaumasite is closely related to the aluminum source in cement-based materials and sulfate in the external environment. In this paper,aluminum source tricalcium aluminate (C₃A), erosion medium Na₂SO₄ solution and monomineral tricalcium silicate (C₃S) were used to prepare the cement paste. XRD, FTIR and SEM/EDS were used to characterize the effects of different molar ratios of SO^2-₄ to C₃A (S/Al ratios) on the formation of thaumasite in monomineral C₃S cement paste, so as to reveal the formation mechanism of thaumasite and find the methods to inhibit its formation. The results show that when the S/Al ratio is 3, there is no thaumasite detected in the erosion products after 14 months of attack. When the S/Al ratio is 6 and 9, thaumasite can be detected after 3 months, indicating that the higher external sulfate ion concentration is more beneficial for the formation of thaumasite.

Key words: S/Al ratio, sulfate attack, thaumasite, monomineral, solid product, ettringite

CLC Number:

TU528.45

LI Xiangguo, TIAN Bo, HE Chao, LYU Yang, JIAN Shouwei, JIANG Dongbing, ZHANG Cheng, ZHOU Yang. Effect of SO₄^2-/C₃A Ratio on Formation of Thaumasite in Monomineral C₃S Cement Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2637-2643.

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Effect of SO₄^2-/C₃A Ratio on Formation of Thaumasite in Monomineral C₃S Cement Paste

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