Effect of Initial Curing Conditions on Thaumasite Form of Sulfate Attack of Cement Based Materials

Abstract:

The effects of initial high humid air-curing, standard water-curing and sealed-curing on thaumasite form of sulfate attack (TSA) of cement based materials were studied. The erosion products after three years attack in 5% MgSO4 solution were analyzed by means of X-ray Diffraction (XRD) and Fourier Transform Infrared Spectroscopy (FTIR). Initial high humid air-curing can delay the TSA of specimens for CaCO3 generated by carbonation and filled in the pores of the specimens, forming a compacted surface and restricting the intrusion of SO42-. In comparison, specimens cured in sealed condition occurred TSA most serious resulting from that large amount of inter-defects in specimens for the lower hydration degree, and SO42- ions could intrude into specimens more easily.

• Periodical: Applied Mechanics and Materials (Volumes 275-277)
• Pages: 2136-2140
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.275-277.2136
• Online since: January 2013
• Authors: Chang Hui Yang, Xiao Bin Xiang, Ben Wan Liu, Jing Zhang
• Keywords: Cement, Initial Curing Condition, Sulfate Attack, Thaumasite

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