Resistance of Portland-Dolomite Micro-Powder Cement Mortar to Thaumasite Sulfate Attack

Abstract

Abstract: In order to evaluate the resistance of Portland-dolomite micro-powder cement mortar to thaumasite sulfate attack (TSA), the appearance, expansion and mass change of cement mortar in 5% (mass fraction) Na₂SO₄ solution at 5 ℃ were studied when the content of dolomite micro-powder was 0%~30% (mass fraction). The erosion products were analyzed by XRD, FTIR, TGA-DTG, SEM and thermodynamic simulation. The results show that the introduction of dolomite micro-powder significantly reduces the TSA resistance of cement mortar. With the increase of dolomite micro-powder content, the appearance damage grade, expansion degree and mass of mortar increase significantly. The higher the content is, the more significant the deterioration effect is. Compared with the reference sample, the cement mortar system containing dolomite micro-powder system produces more ettringite and gypsum in the early stage of erosion, and a large amount of thaumasite is generated in the later stage of erosion. Dolomite micro-powder participates in the hydration reaction of cement to form hydrotalcite, carboaluminate and calcite. In low temperature sulfate attack, the stable existence of hydrotalcite inhibits the formation of ettringite, while carboaluminate and calcite significantly promote the formation of thaumasite. The positive effect of the reaction of dolomite micro-powder to hydrotalcite is far less than the negative effect caused by the formation of carboaluminate and calcite, which eventually leads to TSA damage of cement mortar.

Key words: dolomite micro-powder, thaumasite, sulfate attack, expansion rate, mass change

CLC Number:

TQ172.4

XU Jiangtao, LIU Fei, YANG Tong, LU Duyou. Resistance of Portland-Dolomite Micro-Powder Cement Mortar to Thaumasite Sulfate Attack[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(12): 4322-4329.

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