江淮水利科技Issue(5)：16-22,41,8.DOI:10.20011/j.cnki.JHWR.202505004
纳米二氧化硅改性水工混凝土微结构演变与调控机理
Microstructural evolution and regulation mechanism of nano-silica modified hydraulic concrete
李洋 1梁炳观 1李显2
作者信息
- 1. 安徽省水利水电勘测设计研究总院股份有限公司,安徽 合肥 230088
- 2. 安徽省水利水电工程检测有限公司,安徽 合肥 230088
- 折叠
摘要
Abstract
To enhance the durability performance of hydraulic concrete under abrasion and sulfate erosion and extend its ser-vice life in harsh environments,this study employed nano-silica(NS)to optimize both mechanical properties and corrosion re-sistance.A systematic analysis was conducted on the microstructural evolution mechanisms of hydraulic concrete under com-bined abrasion and sulfate attack.Utilizing characterization techniques including GEMS,low-field NMR,solid-state NMR,and TG/DSC,experimental results revealed that NS incorporation slightly reduced concrete workability while significantly improving mechanical and anti-corrosion properties.The modified hydraulic concrete demonstrated 18%increase in 28-day compressive strength,30.4%enhancement in flexural strength,56.0%improvement in abrasion resistance,and an elevated anti-corrosion coefficient of 1.05.Microscopic analysis further indicated that NS particles effectively refined initial pore structures by filling voids,reduced harmful porosity,and promoted additional C-S-H gel formation to enhance matrix compactness.This optimized microstructure effectively inhibited excessive AFt formation under combined impact and sulfate erosion,thereby mitigating ex-pansion-induced structural damage.These synergistic effects collectively contribute to superior service performance of NS-modified hydraulic concrete in aggressive environments.关键词
水工混凝土/冲磨与硫酸盐侵蚀/纳米二氧化硅/钙矾石/水化产物Key words
hydraulic concrete/combined abrasion-sulfate attack/nano-silica/ettringite/hydration products分类
建筑与水利引用本文复制引用
李洋,梁炳观,李显..纳米二氧化硅改性水工混凝土微结构演变与调控机理[J].江淮水利科技,2025,(5):16-22,41,8.
