Carbonation of Portland Cement Mortars Including Metakaolin and Limestone

• 作 者: ZhenguoShi[1]BarbaraLothenbach[2]MetteRicaGeiker[3]JosefKaufmann[2]SergioFerreiro[4]J(o)rgenSkibsted[1]
• 机 构: Department of Chemistry and Interdisciplinary Nanoscience Center (iNANO),Aarhus University, 8000 C A
• 出 处: The 14th International Congress on the Chemistry of Cement (
• 发表日期: 2015年期

　　Carbonation of Portland cement mortars including metakaolin and limestone has been investigated.Mortar bars of a white Portland cement (P) and of three blends with a clinker replacement level of 35 wt.%, i.e., pure limestone (L), pure metakaolin (M), and metakaolin/limestone (ML, 3:1 w/w), were cured saturated at 20 ℃ for 91 days and then exposed to 1% (v/v) CO2 for another 91 days at a relative humidity of 57 %.Slices with a 15-20 mm thickness were split from the mortar bars and the carbonation depths were measured using a 1% phenolphthalein pH indicator.Thermo-gravimetric analysis (TGA) was used for quantification of portlandite and calcium carbonate.These data were compared with predictions from thermodynamic modeling.In addition,the microstructure was characterized by mercury intrusion porosimetry (MIP).