低温环境下硅灰对掺无碱速凝剂水泥砂浆抗压强度和抗渗性的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (9): 3273-3281.

低温环境下硅灰对掺无碱速凝剂水泥砂浆抗压强度和抗渗性的影响

刘亚炜¹, 胡阳¹, 罗琦¹, 鲁刘磊¹, 裴大田¹, 李斌斌², 马俊³, 汪峻峰^1,2,4

1.深圳大学土木与交通工程学院,深圳 518060;
2.建华建材(中国)有限公司,镇江 212000;
3.中国建筑第八工程局有限公司,深圳 518000;
4.佛山格耐特新型建筑材料科技有限公司,佛山 528000)

收稿日期:2024-03-04 修订日期:2024-04-15 出版日期:2024-09-15 发布日期:2024-09-19
通信作者: 鲁刘磊,副研究员。E-mail:luliulei521@163.com;汪峻峰,教授。E-mail:drjunfengwang2010@163.com
作者简介:刘亚炜(1998—),男,硕士研究生。主要从事喷射混凝土方面的研究。E-mail:liuyawei2021@email.szu.edu.cn
基金资助:
海南省重点研发项目(ZDYF2022SHFZ322);佛山市科技创新项目(2018IT00232)

Influence of Silica Fume on Compressive Strength and Impermeability of Cement Mortar with Alkali-Free Accelerator at Low Temperatures

LIU Yawei¹, HU Yang¹, LUO Qi¹, LU Liulei¹, PEI Datian¹, LI Binbin², MA Jun³, WANG Junfeng^1,2,4

1. College of Civil and Transportation Engineering, Shenzhen University, Shenzhen 518060, China;
2. Jianhua Building Materials (China) Co., Ltd., Zhenjiang 212000, China;
3. China Construction Eight Engineering Division Corp., Ltd., Shenzhen 518000, China;4. Foshan GENAITE New Building Material Technology Co., Ltd., Foshan 528000, China)

Received:2024-03-04 Revised:2024-04-15 Published:2024-09-15 Online:2024-09-19

摘要/Abstract

摘要： 低温环境会影响隧道喷射混凝土早期性能的发展。本文研究了低温环境下硅灰对掺无碱速凝剂水泥砂浆流动性、抗压强度和抗渗性的影响,并采用XRD、TG-DTG和MIP分析了水化产物和孔结构的变化。结果表明:低温下硅灰显著提高了砂浆的1 d抗压强度,增幅超过300.0%;添加5%(质量分数)的硅灰能小幅增强28 d抗压强度,增幅达4.7%。此外,砂浆的抗渗性随着硅灰掺量的增加而提升,当添加的硅灰超过10%时,砂浆抗渗能力明显增强。在低温环境下,硅灰可以发挥火山灰效应和微填充效应,使多害孔朝少害孔方向转化,细化孔结构,使浆体结构更加密实,从而提高砂浆的抗压强度和抗渗性。

关键词: 低温, 硅灰, 无碱速凝剂, 抗压强度, 抗渗性, 微观结构

Abstract: Low temperature environment affects the development of early performance of tunnel shotcrete. This study investigated the effects of silica fume on the fluidity, compressive strength, and impermeability of alkali-free accelerator-modified cement mortars at low temperatures. XRD, TG-DTG and MIP were used to analyze the changes in hydration products and pore structure. The results show that using silica fume significantly improves the 1 d compressive strength of mortar at low temperatures with an increase of over 300.0%. At 28 d, incorporating 5% (mass fraction) silica fume also increased the compressive strength by 4.7%. Moreover, the impermeability of mortar increases with the increase of the silica fume content. Especially, the impermeability is remarkably improved when the content of silica fume exceeded 10%. Silica fume modification can exert the pozzolanic effect and micro-filling effect at low temperatures, which transformes more-harmful pores towards less-harmful ones, refining the pore structure and making the paste structure denser, thereby improving the compressive strength and impermeability of mortars.

Key words: low temperature, silica fume, alkali-free accelerator, compressive strength, impermeability, microstructure

中图分类号:

TU528

刘亚炜, 胡阳, 罗琦, 鲁刘磊, 裴大田, 李斌斌, 马俊, 汪峻峰. 低温环境下硅灰对掺无碱速凝剂水泥砂浆抗压强度和抗渗性的影响[J]. 硅酸盐通报, 2024, 43(9): 3273-3281.

LIU Yawei, HU Yang, LUO Qi, LU Liulei, PEI Datian, LI Binbin, MA Jun, WANG Junfeng. Influence of Silica Fume on Compressive Strength and Impermeability of Cement Mortar with Alkali-Free Accelerator at Low Temperatures[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3273-3281.

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