Chen Yuejia, Wang Mengya, Xu Tiefu, Liu Jinsuo, Zang Zijun, Li Siru, Jia Xuebin, Ma Jialu
School of Civil Engineering, Heilongjiang University, Harbin 150080, China.
Institute of Engineering Mechanics, China Earthquake Administration, Harbin 150080, China.
Materials (Basel). 2025 May 19;18(10):2361. doi: 10.3390/ma18102361.
The corrosion mechanism of concrete structures in landfills in cold regions is complex, and there are few existing studies that address multifactorial coupled deterioration scenarios. Since loading and freeze-thaw cycles affect concrete deterioration, this study included three test groups-landfill leachate, loaded-landfill leachate, and freeze-thaw cycles-loaded-landfill leachate-and three different corrosion scenarios-gas-liquid, liquid-solid, and gas-liquid-solid. The physico-mechanical changes in concrete in terms of mass, compressive strength, and dynamic elasticity modulus were analyzed, and the deterioration mechanism of concrete was elaborated by its apparent morphology and scanning electron microscope (SEM) images. The study showed that the most serious damage to concrete was caused by freeze-thaw cycles, loading, and landfill leachate coupled in multifactorial situations. The compressive strength and dynamic elastic modulus decreased; the endpoints decreased by 15.75% and 7.42%, respectively, and increased by 12.51% and 6.74% compared with the unapplied load group. The concrete in the gas-liquid-solid test group had the most serious damage among the corrosion scenarios, with a 21.63% decrease in compressive strength. This study determined the most unfavorable corrosion conditions for concrete structures in landfills in cold regions and the corrosion mechanism of concrete exposed to landfill leachate and provides a technical reference for the construction of landfill facilities.
寒冷地区垃圾填埋场混凝土结构的腐蚀机制复杂，现有的针对多因素耦合劣化情况的研究较少。由于荷载和冻融循环会影响混凝土劣化，本研究设置了三个试验组——垃圾渗滤液、荷载-垃圾渗滤液以及冻融循环-荷载-垃圾渗滤液，以及三种不同的腐蚀情况——气-液、液-固和气-液-固。分析了混凝土在质量、抗压强度和动态弹性模量方面的物理力学变化，并通过其表观形态和扫描电子显微镜（SEM）图像阐述了混凝土的劣化机制。研究表明，在多因素耦合情况下，冻融循环、荷载和垃圾渗滤液共同作用对混凝土造成的损伤最为严重。抗压强度和动态弹性模量降低；与未施加荷载组相比，终点分别降低了15.75%和7.42%，并分别提高了12.51%和6.74%。在各种腐蚀情况中，气-液-固试验组的混凝土损伤最为严重，抗压强度降低了21.63%。本研究确定了寒冷地区垃圾填埋场混凝土结构最不利的腐蚀条件以及混凝土暴露于垃圾渗滤液中的腐蚀机制，为垃圾填埋场设施建设提供了技术参考。
