水利水电科技进展2025，Vol.45Issue(3)：8-15,8.DOI:10.3880/j.issn.1006-7647.2025.03.002
碳化对大坝混凝土细观结构及力学特性的影响
Effect of carbonation on mesostructures and mechanical properties of dam concrete
摘要
Abstract
To investigate the impact of carbonation on the mesostructure and mechanical properties of dam concrete,scanning electron microscope(SEM),X-ray computed tomography(X-CT),and combined uniaxial compression-acoustic emission tests were conducted on concrete specimens from the Meishan Arch Dam.Based on Avizo images and acoustic emission parameters,the mesostructural characteristics(including porosity,pore size distribution,and pore morphology)and material damage evolution characteristics of carbonated dam concrete were analyzed.The results show that carbonation alters the microscopic morphology of concrete,numerous calcium carbonate particles appear on the surface of the C-S-H gel,and the porosity decreases.As carbonation progresses,the proportion of pores with equivalent diameters larger than 160 μm increases,while the proportion of pores with equivalent diameters lower than 160 μm decreases.After 14-day and 28-day accelerated carbonation,pores with a sphericity of 0.9 to 1.0 increase by 8.9%and 6.5%,respectively,compared with that of the non-carbonated concrete,indicating that carbonation fills the irregular edges of pores.After carbonation,the overall activity of acoustic emission signals of dam concrete decreases,and the compressive strength and elastic modulus of concrete decline.关键词
大坝混凝土/碳化/细观结构/力学特性/损伤特性Key words
dam concrete/carbonization/mesostructure/mechanical properties/damage characteristics分类
建筑与水利引用本文复制引用
郑开发,卢万友,周程涛,陈波,董春晖..碳化对大坝混凝土细观结构及力学特性的影响[J].水利水电科技进展,2025,45(3):8-15,8.基金项目
国家自然科学基金面上项目(52079049) （52079049）
国家重点实验室基本科研业务费专项资金项目(522012272,5230248A2) （522012272,5230248A2）
