Effect of Nano-SiO2 on Steel Slag/Cement-Based Cementitious Materials

Abstract

Abstract: Steel slag has similar mineral composition with cement, which can be used as a potential cementitious material. However, the high content of steel slag is not conducive to the development of early properties of concrete. Steel slag/cement-based cementitious materials with 30%(by weight) steel slag as the research object were used to discuss the influence of nano-SiO₂ on its early properties. Physical and mechanical properties were evaluated by measuring fluidity, setting time, and compressive strength. The hydration process and hydration products of steel slag/cement-based cementitious materials with nano-SiO₂ were analyzed by micro-thermal analysis, X-ray diffraction (XRD), and differential scanning calorimetry (DCS-TG). Results show that when the mass fraction of nano-SiO₂ is 3%, nano-SiO₂ consumes large amounts of Ca(OH)₂ due to its high pozzolanic activity. Meanwhile, due to the crystallization nucleation and micro-aggregate filling effect of nano-SiO₂ particles, the hydration of steel slag and cement is promoted, and the heat release rate at the initial stage of hydration is improved, thus improving the mechanical properties of steel slag/cement-based cementitious materials, and the 28 d compressive strength increases by 14.0%.

Key words: nano-SiO₂, steel slag, cement, hydration, compressive strength

CLC Number:

TQ172

WU Siyao, DAI Shaobin, MA Baoguo, ZHANG Ting, YANG Hang, SHANG Lishi. Effect of Nano-SiO₂ on Steel Slag/Cement-Based Cementitious Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(5): 1594-1600.

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Effect of Nano-SiO₂ on Steel Slag/Cement-Based Cementitious Materials

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