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The Effect Of Water And Gypsum Content On Strätlingite Formation In Calcium Sulfoaluminate-Belite Cement Pastes, Yeonung Jeong, Craig W. Hargis, Sung-Chul Chun, Juhyuk Moon
The Effect Of Water And Gypsum Content On Strätlingite Formation In Calcium Sulfoaluminate-Belite Cement Pastes, Yeonung Jeong, Craig W. Hargis, Sung-Chul Chun, Juhyuk Moon
Craig Hargis
The main objective of this study was to investigate the phase and strength development of calcium
sulfoaluminate-belite (CSAB) cement pastes with different amounts of gypsum and water.
Thermodynamic modeling and a series of experiments including X-ray diffraction (XRD), thermogravimetric analysis, isothermal calorimetry, and compressive strength tests were performed. Decreasing the mixing water increased the strength of CSAB pastes, but decreased the degree of hydration. Interpretation of the early age XRD results and thermodynamic modeling suggested the formation of a meta-stable phase from the hydration of belite, possibly C-(A)-S-H, which transformed into strätlingite at later ages only in the samples with …