锈蚀与冻融作用对混凝土抗拉性能的影响
Effects of corrosion and freeze-thaw action on the tensile properties of concrete
李国栋1
作者信息
- 1. 德州市水利局,山东 德州 253050
- 折叠
摘要
为探究服役期内不同锈蚀率和冻融循环次数对混凝土拉伸性能影响的规律,通过氯离子电渗和冻融浸泡交替循环试验,并基于单轴拉伸实验结果建立了考虑锈蚀和冻融损伤的混凝土损伤因子计算方法.结果表明:锈蚀渗透对拉伸应力的损伤程度小于冻融循环对混凝土的损伤程度,冻融循环 30 次和 50 次拉伸应力分别降低了约 3.46%和 16.54%;当遭受冻融循环次数为 50 次时,氯离子渗透率为5%和10%的试件损伤因子分别增大了 6.24%和 9.66%.通过对损伤试件拉伸性能进行评估,可对长期服役期内的损伤混凝土结构模拟提供可靠数据.
Abstract
To investigate the effects of different corrosion rates and freeze-thaw cycles on the tensile properties of concrete dur-ing its service life,alternating chloride ion migration and freeze-thaw immersion tests were conducted.Based on the results of uniaxial tensile tests,a method for calculating the concrete damage factor considering both corrosion and freeze-thaw damage was established.The results showed that the damage to tensile stress caused by corrosion penetration was less than that caused by freeze-thaw cycles.Freeze-thaw cycles of 30 and 50 times reduced the tensile stress by approximately 3.46%and 16.54%,respectively.When subjected to 50 freeze-thaw cycles,the damage factor of specimens with chloride ion penetration levels of 5%and 10%increased by 6.24%and 9.66%.Evaluating the tensile properties of the damaged specimens could provide reli-able data for simulating the damage to concrete structures over long service periods.
关键词
锈蚀/冻融循环/混凝土/拉伸性能/损伤因子Key words
corrosion/freeze-thaw cycles/concrete/tensile performance/damage factor引用本文复制引用
出版年
2024
国家科技期刊平台
NSTL
万方数据