煤矿安全2017，Vol.48Issue(7)：57-61,5.DOI:10.13347/j.cnki.mkaq.2017.07.015
硫酸盐腐蚀与冻融共同作用下井壁混凝土损伤劣化研究
Research on Damage and Deterioration of Concrete for Shaft Lining Under Action of Sulfate Corrosion and Freeze-thaw
摘要
Abstract
With the increase of corrosion and freeze-thaw cycles,the changes in the parameters of concrete with initial damage were experimentally studied,including mass,ultrasonic velocity and compressive strength.The quantitative evaluation and parameter fitting was made based on damage mechanical theory.The changes of concrete microstructures were analyzed using the environmental scanning electron microscopy (ESEM).The research results show that:with the increase of corrosion and freeze-thaw cycles,the mass of concrete increases first and then decreases,and ultrasonic velocity and compressive strength of concrete gradually is reduced.The initial damage exacerbates deterioration of concrete.The action of freeze-thaw plays a leading role in the damage and deterioration of concrete and brings the more and greater destructive effect than corrosion.Under the action of freeze-thaw,the initial damage has an more obvious impact on deterioration of concrete.The action of sulfate attack and freeze-thaw leads to the formation and connection of micro-cracks inside concrete.The existence of initial damage leads to more developed micro-cracks network which extends and expands continuously.关键词
初始损伤/硫酸盐腐蚀/冻融损伤/损伤演化/微观结构/混凝土/井壁Key words
initial damage/sulfate corrosion/freezing-thawing damage/damage evolution/microstructure/concrete/shaft lining分类
矿业与冶金引用本文复制引用
赵力,宋少民,刘娟红,纪洪广..硫酸盐腐蚀与冻融共同作用下井壁混凝土损伤劣化研究[J].煤矿安全,2017,48(7):57-61,5.基金项目
国家重点研发计划资助项目(2016YFC0600800) （2016YFC0600800）
国家自然科学基金资助项目(51374036) （51374036）
