Effect of Nano-SiO2 on Early Properties and Microstructure of Fiber-Reinforced Ordinary Portland Cement-Sulphoaluminate Cement Composites

Abstract

Abstract: In order to optimize the properties of fiber-reinforced ordinary Portland cement-sulfoaluminate cement composites (OPC-CSA-ECC) and extend the use of nano-SiO₂, this study discussed the effects of nano-SiO₂ on the setting time, strength and toughness of OPC-CSA-ECC. Microstructure and modification mechanism of OPC-CSA-ECC were analyzed by XRD and SEM. The results show that, nano-SiO₂ shortens the setting time of the composite cementitious, and the greater the content, the shorter the setting time. Nano-SiO₂ improves the strength and toughness of OPC-CSA-ECC. The appropriate content of nano-SiO₂ is 1.5% (mass fraction), the corresponding compressive strength at 7 d and 28 d is 59.1 MPa and 85.4 MPa, and the equivalent flexural toughness is 195.82 kJ/m³ and 256.51 kJ/m³, respectively. Nano-SiO₂ doesn't change the type of hydration products, but promotes the formation of C-S-H gel and consumes some portlandite crystals. SiO₂ increases the adhesion between the matrix and fiber by increasing the density of the matrix, which contributes to improve strain hardening ability.

Key words: nano-SiO₂, engineered cementitious composite, mechanical property, toughness, microstructure

CLC Number:

TU525.9

WANG Yuhua, SUN Shuanhu. Effect of Nano-SiO₂ on Early Properties and Microstructure of Fiber-Reinforced Ordinary Portland Cement-Sulphoaluminate Cement Composites[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(3): 795-801.

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Effect of Nano-SiO₂ on Early Properties and Microstructure of Fiber-Reinforced Ordinary Portland Cement-Sulphoaluminate Cement Composites

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