土木与环境工程学报（中英文）2024，Vol.46Issue(5)：168-174,7.DOI:10.11835/j.issn.2096-6717.2022.086
高温历程对碱矿渣混凝土残余抗压强度的影响
Influence of temperature elevation on residual compressive strength of alkali activated slag concretes
摘要
Abstract
This paper studied the influence of temperature increase rates(5,10℃/min),duration at target temperatures(1,2 hours)and cooling methods(natural cooling,water cooling)on the residual compressive strength of alkali activated slag concretes after high temperature.The microstructural change of the alkali activated slag matrix with temperature elevation was also studied to analyze the strength change.The results show that when the higher temperature increase rate was used,within 400℃,the influence of thermal stress was not sufficient,and a shorter duration in heat could remain the strength of concretes at a considerable level;with temperature elevation to 800℃,residual strength decreased dramatically with the increase of thermal stress;afterwards,thermal stress has achieved a certain extent,and a shorter duration in heat remained the strength.Increase in duration at target temperature has intensified the deterioration of alkali activated slag matrix and matrix-aggregates ITZ,resulting in the decrease of the residual strength.Water cooling has lowered the temperature of C-S-H hydrates to decompose,as well as resulted in thermal stress in concretes,and consequently limited the remain of the residual strength.关键词
碱矿渣混凝土/抗压强度/高温历程/胶凝材料/微观结构Key words
alkali activated slag/compressive strength/temperature elevation/cementing material/microstructure分类
建筑与水利引用本文复制引用
马倩敏,刘倩,李黎山,秦枭宇,张淼,史天尧..高温历程对碱矿渣混凝土残余抗压强度的影响[J].土木与环境工程学报（中英文）,2024,46(5):168-174,7.基金项目
国家自然科学基金(52068038) （52068038）
云南省科技厅基础研究专项-面上项目(202101AT070089) （202101AT070089）
昆明理工大学分析测试基金(2020M20192210078) National Natural Science Foundation of China(No.52068038) （2020M20192210078）
General Project of Basic Research Special Project of Yunnan Province Science and Technology Department(No.202101AT070089) （No.202101AT070089）
Analysis and Test Foundation of Kunming University of Science and Technology(No.2020M20192210078) （No.2020M20192210078）
