防灾减灾工程学报2017，Vol.37Issue(1)：148-153,6.DOI:10.13409/j.cnki.jdpme.2017.01.021
硫酸盐与冻融环境下混凝土损伤破坏准则研究
Study on Damage Failure Criterion of Concrete under Sulfate Attack and Freeze-thaw Environment
摘要
Abstract
In order to effectively assess mechanical property of concrete exposed to freeze-thaw cycles in sulfate environment,the degradation rule of mechanical property of concrete was studied under sulfate attack and freeze-thaw cycles.Based on the continuum damagc mechanics and Ottosen four-parameter failure criterion,the damage failure model of concrete under sulfate attack and freeze-thaw cycles was established.The experimental results show that the peak stress and elastic modulus of concrete decrease and the peak strain increases gradually with the increase of freezethaw cycles.Moreover,the tension and compression meridian of concrete moves to the hydrostatics compressive axis,and concrete failure surface shrinks gradually with the increase of damage and the crack-resistant property of concrete reduces.The tension and compression meridian of concrete are significantly dependent on the types of sulfate solutions.At the same time of freeze-thaw cycles,the shrinkage degree of tension and compression meridian of concrete in magnesium sulfate solution is more obvious,indicating that the concrete deterioration by magnesium sulfate causes more aggressive corrosion.关键词
混凝土/冻融循环/硫酸盐侵蚀/损伤/Ottosen破坏准则Key words
concrete/freeze-thaw cycles/sulfate attack/damage/Ottosen failure criterion分类
建筑与水利引用本文复制引用
姜磊,牛荻涛..硫酸盐与冻融环境下混凝土损伤破坏准则研究[J].防灾减灾工程学报,2017,37(1):148-153,6.基金项目
国家自然科学基金项目(51278403)、教育部创新团队发展计划项目(IRT13089)资助 （51278403）
