Performance Deterioration of Concrete Under the Combined Action of SO2 and CO2
NIU Ditao1,2, YANG Ruixi1, LYU Yao1,*, SUN Xingxing1, CAO Zhiyuan1, WU Hongqu1
1 School of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 2 State Key Laboratory of Green Building in Western China, Xi’an University of Architecture and Technology, Xi’an 710055, China
Abstract: During the industrial production processes of electricity, machinery, metallurgy and chemical industries, a large amount of SO2 and CO2 gases are emitted, which lead to the problem of durability of concrete structures and seriously reduce the service life of concrete structures. In this work, the changing patterns of neutralization depth, relative dynamic elastic modulus and damage layer thickness of concrete under the combined action of SO2 and CO2 were investigated. The microscopic morphology, phase composition and pore structure of concrete, both before and after corrosion, were tested by scanning electron microscopy(SEM), X-ray diffraction(XRD) and nuclear magnetic resonance(NMR), and the corrosion mechanism of concrete under the combined action of SO2 and CO2 was revealed. The results show that both the neutralization depth and the damage layer thickness show a distinctive “three-stage” growth trend. For concrete with a water-binder ratio of 0.57, the neutralization depth and damage layer thickness reach 20.55 mm and 10.93 mm, respectively, after the 35th corrosion cycle. The relative dynamic elastic modulus increases first and then decrease, and it increases with the increase of water-binder ratios. Under the combined action of SO2 and CO2, the final product of concrete corrosion is gypsum. Compared with uncorroded concrete, the expansive gypsum formated increases the porosity of neutra-lized concrete, and the porosity of concrete with water-cement ratio of 0.37, 0.47 and 0.57 increases by 0.19%, 0.18% and 0.15% respectively after the 35th corrosion cycle, and the pore structure of concrete tends to develop from small pores to medium pores and from medium pores to large pores.
牛荻涛, 杨瑞希, 吕瑶, 孙杏杏, 曹志远, 吴鸿渠. SO2和CO2共同作用下混凝土性能劣化研究[J]. 材料导报, 2025, 39(5): 23120166-7.
NIU Ditao, YANG Ruixi, LYU Yao, SUN Xingxing, CAO Zhiyuan, WU Hongqu. Performance Deterioration of Concrete Under the Combined Action of SO2 and CO2. Materials Reports, 2025, 39(5): 23120166-7.
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2025, Vol. 39 
