摘要
研究了不同外加应力条件下,40Si2Mn中碳钢在混凝土环境中的腐蚀行为,分析了钢筋腐蚀断裂的影响因素及其作用机理。结果表明,钢筋-混凝土试样在3.5%NaCl溶液中浸泡250天后,在外加应力为0%、20%和40%时试样未断裂,且表面裂纹数量明显少于相同外加应力条件下未埋入钢筋的混凝土试样;在外加应力为60%和80%的试样表面可见明显的较宽裂纹;随着外加应力的增加,相同腐蚀时间条件下,试样的腐蚀电流密度有所增大,相同腐蚀时间下的试样的阻抗值逐渐降低;随着外加应力的增加,钢筋表面的腐蚀区域逐渐增加,且在外加应力为80%时,钢筋表面出现了明显的尺寸较大的显微裂纹,此时钢筋已经受到严重腐蚀,承载能力下降。
The corrosion behavior of 40Si2Mn medium carbon steel under different external stress conditions in concrete was studied, and the influencing factors and mechanism of corrosion fracture were also analyzed. The results show that the steel bars reinforced concrete samples were soaked in 3.5%NaC1 solution for 250 days, the samples are not broken when the external stress is 0%, 20% and 40%, and the number of surface cracks of the samples are obviously less than that of the original steel bars. Obvious wide cracks can be seen on the surface of samples with external stress of 60% and 80%. With the increase of external stress, the corrosion current density of samples increases under the same corrosion time condition, and the impedance of samples under the same corrosion time decrease gradually. With the increase of external stress, the corrosion area on the surface of steel bars increases gradually. Moreover, when the external stress is 80%, the surface of steel bars has obvious large-size microcracks, at same time, the steel bars have been seriously corroded and the load capacity has been reduced.
作者
张雅静
李治国
何文丽
ZHANG Yajing;LI Zhiguo;HE Werdi(School of Engineering,Inner Mongolia College of Construction,Hohhot 010010,China;School of Materials Science and Engineering,Inner Mongola Univesity of Technology,Hohhot 010051,China)
出处
《铸造技术》
CAS
2018年第9期2117-2120,共4页
Foundry Technology
基金
内蒙古工业大学基金(X201501)
关键词
外加应力
混凝土环境
碳钢
腐蚀
形貌
applied stress
concrete environment
carbon steel
corrosion
morphology
