水利水电技术（中英文）2024，Vol.55Issue(7)：173-185,13.DOI:10.13928/j.cnki.wrahe.2024.07.015
不同温度下低热混凝土强度及孔结构分形特征研究
Study on strength and pore structure fractal characteristics of low-heat concrete with different temperature
摘要
Abstract
[Objective]In order to explore the relationship between microscopic structure evolution law and macroscopic mechani-cal properties of low-heat concrete under real temperature environment,[Methods]the compressive strength and pore structure tests of low-heat concrete under different temperatures(20 ℃,30 ℃,40 ℃)were designed and carried out.Based on the scanning electron microscope(SEM)images,the fractal dimension of low-heat concrete was calculated by the box dimension method.Finally,a compressive strength prediction model considering fractal dimension was established.[Results]The results show that under high temperature curing,the most probable pore diameter and porosity decrease,the fractal dimension increases from 1.796 8 to 1.886 8,and the compressive strength increases significantly.[Conclusion]The microscopic space state corre-sponding to 36％～42％porosity and 10～20 nm pore diameter is most complex,high temperature curing increases the pore size content of 10～20 nm and effectively improves the compressive strength.The prediction model can quantitatively describe the cou-pling relationship between mechanical properties of low-heat concrete and fractal dimension of pore structure,which provide theo-retical support for the durability and safety design of dam concrete under different temperatures.关键词
低热混凝土/温度/孔结构/分形维数/预测模型/力学性能Key words
low-heat concrete/temperature/pore structure/fractal dimension/prediction model/mechanical properties分类
建筑与水利引用本文复制引用
关彬,陈博夫,刘硕..不同温度下低热混凝土强度及孔结构分形特征研究[J].水利水电技术（中英文）,2024,55(7):173-185,13.基金项目
国家自然科学基金青年项目(52109158) （52109158）
