纳米SiO2对氧化镁激发矿渣材料性能的影响试验研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (7): 2393-2399.

纳米SiO₂对氧化镁激发矿渣材料性能的影响试验研究

方虎¹, 陈佩圆^1,2, 张立恒¹

1.安徽理工大学土木建筑学院,淮南 232001;
2.安徽理工大学环境友好材料和职业健康研究院,芜湖 241000

收稿日期:2022-03-04 修回日期:2022-04-20 出版日期:2022-07-15 发布日期:2022-08-01
通讯作者: 陈佩圆,博士,副教授。E-mail:peiyuan29@126.com
作者简介:方虎(1995—),男,硕士研究生。主要从事建筑与工业固废资源化利用方面的研究工作。E-mail:13731945032@163.com
基金资助:
国家自然科学基金(520080003);芜湖市科技计划(ALW2020YF16);安徽省住房城乡建设科学计划(2020-YF12);安徽省高等学校自然科学研究重大项目(KJ2020ZD33);安徽省自然科学基金青年基金(1908085QE213)

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

FANG Hu¹, CHEN Peiyuan^1,2, ZHANG Liheng¹

1. School of Civil Engineering and Architecture, Anhui University of Science and Technology, Huainan 232001, China;
2. Institute of Environment-Friendly Materials and Occupational Health, Anhui University of Science and Technology, Wuhu 241000, China

Received:2022-03-04 Revised:2022-04-20 Online:2022-07-15 Published:2022-08-01

摘要/Abstract

摘要： 为改善MgO-激发矿渣材料(MASM)力学性能,利用纳米SiO₂(NS)促进MASM的强度发展,研究了不同NS掺量对MASM凝结时间、抗压强度、水化历程、水化产物和微观形貌的影响,分析并揭示了NS的作用机理。研究结果表明:随着NS掺量的增大,MASM凝结时间逐渐缩短,流动度逐渐减小;NS掺量越大,矿渣水化越快,主要水化峰出现越早,峰值越高。NS不仅促进了MgO的反应和C-(A)-S-H的形成,还提高了MASM的结构密实性。掺入1%~2%(质量分数)的NS,可将MASM的抗压强度分别提高7.12%~33.37%(3 d)、12.44%~26.29%(7 d)、12.49%~31.09%(28 d)。

关键词: 碱激发矿渣, MgO, 纳米SiO₂, 水化特性, 抗压强度, 微观结构

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

中图分类号:

TU528

方虎, 陈佩圆, 张立恒. 纳米SiO₂对氧化镁激发矿渣材料性能的影响试验研究[J]. 硅酸盐通报, 2022, 41(7): 2393-2399.

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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纳米SiO₂对氧化镁激发矿渣材料性能的影响试验研究

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

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