Experimental Study on Influence of Nano-SiO2 on Properties of MgO-Activated Slag Material

Abstract

Abstract: In order to improve the mechanical properties of MgO-activated slag material (MASM), nano-SiO₂ (NS) was used to promote the strength development of MASM. The effects of NS dosage on the setting time, compressive strength, hydration process, hydration products and microstructure of MASM were investigated and the mechanism of action of NS was revealed. Experimental results show that the addition of NS changes the performance of MASM obviously. A higher dosage of NS results in a shorter setting time and a lower flowability of MASM. The larger the NS content is, the faster the slag hydration is, the earlier the main hydration peak appears, and the higher the peak value is. The addition of NS not only promotes the reaction degree of MgO and the production of C-(A)-S-H gel products, but also contributes to more densified microstructure of MASM. The compressive strengths of MASM increases by 7.12%~33.37% (3 d), 12.44%~26.29% (7 d) and 12.49%~31.09% (28 d) by adding 1%~2% (mass fraction) NS.

Key words: alkali-activated slag, MgO, nano-SiO₂, hydration property, compressive strength, microstructure

CLC Number:

TU528

FANG Hu, CHEN Peiyuan, ZHANG Liheng. Experimental Study on Influence of Nano-SiO₂ on Properties of MgO-Activated Slag Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(7): 2393-2399.

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Experimental Study on Influence of Nano-SiO₂ on Properties of MgO-Activated Slag Material

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