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论文类型：期刊论文

发表时间：2017-02-15

发表刊物：CONSTRUCTION AND BUILDING MATERIALS

收录刊物：SCIE、EI

卷号：133

页面范围：314-322

ISSN号：0950-0618

关键字：Calcium sulfoaluminate; Amorphous AH(3) phase; Ettringite; Compressive strength; Hydration

摘要：Calcium sulfoaluminate cement (CSA) is promoted as one of the most promising cements, which requires less energy for its production and leads to lower CO2 emissions. AH(3) phase is the main amorphous hydration product of CSA. This study explored the effect of AH(3) phase on mechanical property and hydration process. Calcium sulfoaluminate (CAS) was synthesized by laboratory reagents with different phase compositions. Afterwards, C(4)A(3)(S) over bar was incorporated with specific quantities of gypsum and calcium hydroxide, which determined the ratio of AH(3) phase to ettringite in the final products. The compressive strength was investigated and hydration products were characterized with XRD and TGA The microstructure and morphology were followed with SEM and MIP. The findings showed that the hydration process proceeds rapidly and there only exists ettringite and amorphous AH(3) phase in hydration products. AH(3) phase has great influence on the mechanical strength and fills empty spaces thus improving the compacity of the cement paste, meanwhile this increase in compacity seems to reduce the dissolution of anhydrous phases leading to a decrease of the hydration degree. (C) 2016 Published by Elsevier Ltd.