Effect of Initial Curing Conditions on Thaumasite Form of Sulfate Attack of Cementitious Materials
YANG Chang hui,ZHANG Jing,YE Jian xiong,WU Fang and CHEN Ke
DOI:10.11835/j.issn.1674-4764.2010.02.025
Received December 28, 2009,Revised , Accepted , Available online July 01, 2015
Volume ,2010,Pages 135-139
- 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 180 days attack in sulfate solution were analyzed by the way of X ray diffraction(XRD) and fourier transform infrared spectroscopy(FTIR).And it was found that the TSA of the cement stone was delayed in high humid air resulting from that CaCO3 generated from carbonation was filled in the pores of the specimens, forming a compacted surface and restricting SO42- intrusion.In comparison, the extent of TSA of the specimens cured in sealed condition was most severe resulting from that large amount of inter defects in specimens for the lower hydration degree, and SO42- ions could intrude into specimens more easily.