人民长江2025，Vol.56Issue(6)：198-205,237,9.DOI:10.16232/j.cnki.1001-4179.2025.06.026
混凝土界面过渡区微观表征与力学性能关系分析
Analysis on relationship between microcosmic quantitative characterization and mechanical properties of concrete interfacial transition zone
摘要
Abstract
The interfacial transition zone(ITZ)between aggregates and cement paste in concrete constitutes a weak region,weakening both strength and durability.To address the limited research on the relationship between Ca(OH)2 crystals(hereafter referred to as CH crystals)microcosmic characterization in the ITZ and material mechanical properties,this study employed FT-IR,XRD,and TG techniques to quantitatively characterize the orientation index,average crystal size,and content of interfacial CH crystals.The evolution of CH crystal structure was elucidated,thereby establishing a correlation between the CH crystal orientation index and mechanical performance.Key findings reveal that the ITZ exhibits CH crystal enrichment,oriented growth,and large crystal dimensions.With increasing curing age,CH crystal content rises while the orientation index gradually declines.The incor-poration of fly ash and silica fume reduces the orientation index,size,and content of CH crystals.Furthermore,empirical relation-ships between the CH crystal orientation index and flexural/compressive strength were fitted for mixtures with different supplemen-tary cementitious materials.关键词
混凝土/界面过渡区/CH晶体/微结构Key words
concrete/interfacial transition zone(ITZ)/CH crystals/microstructure分类
建筑与水利引用本文复制引用
牟伟楠,陈东海,张策,魏小旺,李明霞,朱水萍..混凝土界面过渡区微观表征与力学性能关系分析[J].人民长江,2025,56(6):198-205,237,9.基金项目
中央级公益性科研院所基本科研业务费项目"内养护型混凝土防裂抗渗材料及性能研究"(CKSF2019507/CL) （CKSF2019507/CL）
