[1003] IMPACT OF DEMOULDING AGE AND MINERAL COMPOSITION OF CEMENT ON DRYING SHRINKAGE OF CEMENT PASTE
キーワード：age at start of drying, cement paste, drying shrinkage, early demoulding, セメントペースト, 乾燥収縮, 乾燥開始材齢, 早期脱型
Drying shrinkage of cement paste, which is affected by the age of start of drying and mineral composition of used cement, is investigated. Based on the shrinkage strain measurement and XRD/Rietveld analysis, a linear relationship between amount of amorphous phase and drying shrinkage is confirmed. But those relationships were not consistent among different cement. The reason of the different trend can be explained by the ratio of amount of portlandite to amount of amorphous, because portlandite is expected to restrain the colloidal agglomeration of amorphous.