碳化作用
钙矾石
固化(化学)
水泥
伯利特
材料科学
溶解
化学工程
复合材料
化学
硅酸盐水泥
熟料(水泥)
有机化学
工程类
作者
Raju Sharma,Hyeju Kim,Nam Kon Lee,Jung-Jun Park,Jeong Gook Jang
标识
DOI:10.1016/j.cemconres.2022.107012
摘要
The present study investigates the effect of carbonation curing and the water-cement ratio on the microstructural characteristics and CO2 uptake of calcium sulfoaluminate (CSA) cement. Low-pH carbonic acid promoted ettringite participation in CaCO3 formation. Different CaCO3 polymorphs, Al(OH)3, and unreacted ye'elimite occupied the higher proportion of the phase assemblage of carbonation-cured sample. Ettringite and strätlingite were the major phases of the water-cured sample. A maximum fourfold increase in the CO2 uptake capacity per gram of the carbonation-cured paste at the highest water-cement ratio was observed. 27Al NMR demonstrates the strätlingite formation after 1 day of water curing, while unreacted ye'elimite was observed in the carbonation-cured sample. The dissolution of hydrated phases leading to the formation of CaCO3, moderately affects the strength. The maximum proportion of weight was reached within 1 day of water curing due to the reaction of ye'elimite and belite to the formation of ettringite and strätlingite, respectively.
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