AUTHOR=Huo Guang , Jiang Xinchao , Sun Xiaoheng , Li Hui , Shi Hongxing 

TITLE=Performance of high-belite calcium sulfoaluminate cement subjected to hydrochloric acid and sulfuric acid

JOURNAL=Frontiers in Materials

VOLUME=Volume 10 - 2023

YEAR=2024

URL=https://www.frontiersin.org/journals/materials/articles/10.3389/fmats.2023.1282919

DOI=10.3389/fmats.2023.1282919

ISSN=2296-8016

ABSTRACT=This study investigates the resistance of a new high-belite calcium sulfoaluminate (HB-CSA) cement to hydrochloric and sulfuric acid. Additionally, the impact of the ye'elimite (C4A3S̅ )-to-gypsum (CS̅ ) ratio on the acid resistance of HB-CSA is discussed. The resistance performance is investigated by flexural strength and resistance index analyses, X-ray diffraction (XRD), thermogravimetric analysis (TGA), electronic computed tomography (CT) scans, and scanning electron microscopy (SEM). The results show that the HB-CSA exhibits superior resistance to sulfuric acid and hydrochloric acid compared to Portland cement. The absence of portlandite contributes to the enhanced performance of HB-CSA. In addition, as the C4A3S̅ -to-CS̅ ratio decreases, the content of Aft in HB-CSA increases, leading to an increase in the acid resistance of HB-CSA.