Effect of EVA on Microstructure and Mechanical Properties of Calcium Sulfoaluminate Cement Paste

Abstract

Abstract: The effect of ethylene-vingyl acetate (EVA) on compressive strength, setting time, drying shrinkage, mass loss and internal temperature of calcium sulfoaluminate cement (CSA) paste was studied, and the hydration products and microstructure at the age of 6 h and 28 d were analyzed by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscope (SEM) and energy dispersive spectroscopy (EDS). The results show that the setting time of CSA paste decreases significantly with the addition of EVA, and the compressive strength increases at 6 h, but decreases at 1 d, 3 d, and 28 d. The drying shrinkage and mass loss ratio of CSA paste gradually decrease with the increases of EVA. The addition of EVA improves the peak value of the internal temperature curve of CSA paste, and accelerates the appearance time of the peak value. Microscopic analysis shows that EVA could promote the hydration of CSA paste at 6 h, resulting in the formation of more ettringite, while it has inhibitory effect on the hydration of CSA paste at 28 d, and the hydration products reduce.

Key words: EVA, calcium sulfoaluminate cement, hydration product, mechanical property, microstructure, modification mechanism

CLC Number:

TQ172

HE Xiangxiang, MEI Junpeng, JIANG Tianhua, LI Hainan, XU Zhidong, WANG Zhixin, ZHOU Lanlan, ZHOU Zhiyang. Effect of EVA on Microstructure and Mechanical Properties of Calcium Sulfoaluminate Cement Paste[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2628-2636.

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