中南大学学报（自然科学版）2025，Vol.56Issue(5)：1993-2004,12.DOI:10.11817/j.issn.1672-7207.2025.05.025
煅烧钙铝类水滑石改善水泥砂浆抗盐冻性能作用机理研究
Research on mechanism of calcined calcium-aluminum layered double hydroxides to improve salt-freeze resistance of cement mortar
摘要
Abstract
To address the deterioration issues of cement concrete pavements under saline freeze-thaw environments,such as surface spalling and internal reinforcement corrosion,the memory effect of calcium-aluminum layered double hydroxides(CA-LDH)was utilized to investigate the influence of calcined CA-LDH on the salt resistance,freeze-thaw durability and mechanical properties of cement-based materials.Molecular dynamics simulations were employed to analyze the kinetic mechanisms underlying its salt resistance.The results demonstrate that the calcined CA-LDH effectively binds chloride ions from the solution,resulting in the reconstruction of its layered structure,when treated at temperature of 400℃to 800℃.The incorporation of calcined CA-LDH enhances early cement hydration,optimizes the pore size distribution of mortar,and increases the mechanical strength.At an optimal dosage of 1.0%,the pore size distribution is significantly improved,resulting in the highest freeze-thaw resistance,with reductions of 13.4%and 10.2%in the chloride ion diffusion coefficient and electric flux,respectively.Under chloride salt corrosion conditions,calcined CA-LDH effectively binds chloride ions penetrating into the concrete,reducing the concentration of free chloride ions in the concrete structure and hindering their diffusion.Consequently,it synergistically enhances the resistance of cementitious materials against chloride ion erosion.关键词
水泥砂浆/煅烧钙铝类水滑石/抗盐冻性能/分子动力学Key words
cement mortar/calcined calcium-aluminum hydrotalcite/salt frost resistance/molecular dynamics分类
交通运输引用本文复制引用
李盛,张海涛,龙雨微,孙煜,王渺,刘雅儒..煅烧钙铝类水滑石改善水泥砂浆抗盐冻性能作用机理研究[J].中南大学学报（自然科学版）,2025,56(5):1993-2004,12.基金项目
国家自然科学基金资助项目(52378436) （52378436）
湖南省科技创新计划资助项目(2024RC1053) （2024RC1053）
湖南省自然科学基金资助项目(2024JJ6059) （2024JJ6059）
湖南省交通运输厅科技进步与创新计划项目(202235)(Project(52378436)supported by the National Natural Science Foundation of China （202235）
Project(2024RC1053)supported by the Science and Technology Innovation Program of Hunan Province （2024RC1053）
Project(2024JJ6059)supported by the National Science Foundation of Hunan Province （2024JJ6059）
Project(202235)supported by the Science and Technology Progress and Innovation Plan Project of Department of Transportation of Hunan Province) （202235）
