1 School of Civil and Architectural Engineering,Yangtze Normal University, Chongqing 408100, China 2 College of Materials Science and Engineering, Chongqing University, Chongqing 400045, China
Abstract: The bad mechanical strength and water resistance of gypsum are the limited factors for the use of gypsum-based productions. The hydration process of building gypsum, the mechanical strength and water resistance of dihydrate hardening were studied in this paper by the addition of SAC. The result showed that the water consumption of normal consistency was slightly declined and the hydration rate was accelarated by the growing of SAC. Meanwhile, the flexural strength and comprossive strength of 2 h and 3 d-dried were all significantly improved, the increase ra-tios of 2 h were high to 34.8% and 29.0%, while the ratios of 3 d were high to 28.8% and 34.7% with 10% SAC content, separately. In addition, the water saturated flexural strength was improved from 2.35 MPa to 3.38 MPa, the increase ratio was high to 43.8%. The water absorption was reduced. The microstructure was analized by XRD, SEM and MIP. It indicated that the more compact crystal structure was formed by the hydration products of the pinpoint AFt, the amorphous AH3 matrix by SAC, and the need-rob DH crystals by the hydration of building gypsum. AFt and DH crystals intergrowed to play an interconnect function between crystals while AH3 filled densely in the pores. The porosity was declined and the pore size was fined. Consequently, the mechnical properties and the water resistance were all remarkably enhanced.
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2021, Vol. 35 
