Quantitative analysis THAUMASITE formation mechanism

Abstract : Two experimental methods designed synthetic THAUMASITE to study erosion mechanism of cement-based silica sand manufacturers THAUMASITE 's . X-ray diffraction , Raman spectroscopy of cement -based materials instars qualitative analysis of reaction products , and using the Rietveld method for quantitative characterization. The results showed that: THAUMASITE in ettringite can still form an environment , it can be directly described reaction ; in the presence of ettringite formation environment THAUMASITE also be generated , indicating that the carbon and sulfur wollastonite formation mechanism Woodfordite transition mechanism exists. The presence of ettringite increases the yield of thaumasite . In comparison , Woodfordite transition mechanism is more likely to occur than the direct formation mechanism , and the two mechanisms can coexist simultaneously.
Keywords : quantitative Rietveld method based materials THAUMASITE cement analysis
Funds: China Building garnet manufacturers Academy , State Key Laboratory of Green Building Materials Open Fund " cement-based materials THAUMASITE quantitative characterization " ( 533001 ) funded projects
CLC : TU528
Snapshot text :
Thaumasite stone (CaCO3 CaSiO3 CaSO4 15H2O) is due to cement-based materials under long-term immersion in sulfate environment , and with adequate water sources and the environment carbonate produced [ 1 ] . THAUMASITE formation mechanism is now more recognized in two ways: one is the erosion of the environment sulfate , aggregate or carbonized get carbonates, adequate water and hardened cement paste in C-S-H react directly .