Microbiologically induced concrete corrosion in the cracked sewer pipe under sustained load

腐蚀 材料科学 冶金 晶间腐蚀 扫描电子显微镜 开裂 图层(电子) 应力腐蚀开裂 复合材料 压力(语言学) 语言学 哲学
作者
Yajian Wang,Fei Su,Pengpeng Li,Wentao Wang,Hailu Yang,Linbing Wang
出处
期刊:Construction and Building Materials [Elsevier BV]
卷期号:369: 130521-130521 被引量:7
标识
DOI:10.1016/j.conbuildmat.2023.130521
摘要

Microbiologically induced concrete corrosion (MICC) and stress crack are the most common structural defects in concrete sewer pipes. To investigate the microbial corrosion behavior of cracked concrete pipes under sustained loading, coupons with no load, 100% D-Load, and 120% D-Load were pre-adjusted to a suitable environment for acidophilic sulfur oxidizing bacteria (ASOB) colonization, and then placed together in a microbial chamber for 90-day accelerated corrosion. The corrosion variances of these coupons were compared in terms of surface morphology, crystalline violet staining, pH evolutions, crack width changes, as well as characterization results including Scanning Electron Microscope- Energy Dispersive Spectrometer (SEM-EDS) and X-ray Diffraction (XRD). It was found that the stress level slightly accelerates the pH drop on the coupon surface, positively correlates with the corrosion product content of the semi-corrosive layer, and causes stress-corrosion cracking of the semi-corrosive layer, but has little effect on corrosion loss. Stress-corrosion effects were only found in the semi-deteriorated layer of the stressed coupon, but no significant acceleration effect on corrosion rate was observed. This is explained by the fact that MICC is a non-diffusive corrosion where the semi-deteriorated layer is rather thin. Thus, cracking or not of the semi-deteriorated layer does not affect the corrosion rate. This study improves understanding of the service deterioration of sewage pipes.
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