纳米SiO2对超硫酸盐水泥性能影响研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (5): 1494-1501.

纳米SiO₂对超硫酸盐水泥性能影响研究

李贝贝¹, 陈衡^1,2, 侯鹏坤¹, 王晓伟², 程新¹

1.济南大学山东省建筑材料制备与测试技术重点实验室,济南 250022;
2.济大·青岛伟力新材料工程技术研究院,青岛 266736

收稿日期:2022-03-20 修回日期:2022-04-06 出版日期:2022-05-15 发布日期:2022-06-01
通讯作者: 陈衡,博士,讲师。E-mail:mse_chenh@ujn.edu.cn
作者简介:李贝贝(1993—),女,硕士研究生。主要从事低碳水泥基材料的研究。E-mail:2810594551@qq.com
基金资助:
山东省自然科学基金(ZR2020YQ33);国家自然科学基金(52102021);高性能土木工程材料国家重点实验室开放基金(2020CEM003))

Effect of Nano-SiO₂ on Properties of Supersulfated Cement

LI Beibei¹, CHEN Heng^1,2, HOU Pengkun¹, WANG Xiaowei², CHENG Xin¹

1. Shandong Provincial Key Lab for the Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022, China;
2. UJN & Vree Joint Research Institute of New Materials Engineering & Technology, Qingdao 266736, China

Received:2022-03-20 Revised:2022-04-06 Online:2022-05-15 Published:2022-06-01

摘要/Abstract

摘要： 为了克服超硫酸盐水泥(SSC)早期强度低的难题,探究了纳米SiO₂(NS)对SSC水化硬化性能的调控效果与机理。研究了NS对SSC力学性能、产物组成、微观结构和形貌,以及孔隙结构的影响规律。结果表明:掺入NS可显著提升SCC力学性能,其中3 d抗压强度提升了32%,3 d抗折强度提升了28%,90 d抗压强度提升了近一倍;同时,NS能够显著密实SSC孔隙结构,使其临界孔径从72.8 nm降低至6.5 nm。NS的增强机理主要为促进矿粉水化,增加产物中C-(A)-S-H凝胶的生成量和聚合度。本文证明了NS提升SSC水化硬化性能的可行性,为低碳SSC的性能提升提供了新思路。

关键词: 超硫酸盐水泥, 纳米SiO₂, 早期强度, 矿粉水化, C-(A)-S-H凝胶, 临界孔径

Abstract: To overcome the problem of low early strength of supersulfated cement (SSC), the regulation effects and mechanisms of nano-SiO₂(NS) on the hydration hardening performance of SSC were explored. The effects of NS on the mechanical properties, chemical compositions, microstructure, morphology, and pore structure of SSC were studied. The results show that the incorporation of NS significantly improves the mechanical properties of SCC, in which the 3 d compressive strength increases by 32%, the 3 d flexural strength increases by 28%, and the 90 d compressive strength is nearly doubled. Meanwhile, NS significantly densifies the pore structure of SSC, reducing its critical pore diameter from 72.8 nm to 6.5 nm. The enhancement mechanism of NS is mainly to promote the hydration of slag and increase the formation amount and polymerization degree of C-(A)-S-H gel in the product. This work proves the feasibility of NS to improve the hydration hardening performance of SSC and provides a new idea for the performance enhancement of low-carbon SSC.

Key words: supersulfated cement, nano-SiO₂, early strength, hydration of slag, C-(A)-S-H gel, critical pore diameter

中图分类号:

TQ172

李贝贝, 陈衡, 侯鹏坤, 王晓伟, 程新. 纳米SiO₂对超硫酸盐水泥性能影响研究[J]. 硅酸盐通报, 2022, 41(5): 1494-1501.

LI Beibei, CHEN Heng, HOU Pengkun, WANG Xiaowei, CHENG Xin. Effect of Nano-SiO₂ on Properties of Supersulfated Cement[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1494-1501.

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纳米SiO₂对超硫酸盐水泥性能影响研究

Effect of Nano-SiO₂ on Properties of Supersulfated Cement

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