SO<sub>2</sub>和CO<sub>2</sub>共同作用下混凝土性能劣化研究

doi:10.11896/cldb.23120166

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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.

Key words： concrete carbon dioxide sulfur dioxide performance degradation neutralization depth corrosion mechanism

Published: 10 March 2025 Online: 2025-03-18

CLC number:

TU528

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	Articles by authors
	NIU Ditao
	YANG Ruixi
	LYU Yao
	SUN Xingxing
	CAO Zhiyuan
	WU Hongqu

Cite this article:

NIU Ditao,YANG Ruixi,LYU Yao, et al. Performance Deterioration of Concrete Under the Combined Action of SO₂ and CO₂[J]. Materials Reports, 2025, 39(5): 23120166-7.

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https://www.mater-rep.com/EN/10.11896/cldb.23120166 OR https://www.mater-rep.com/EN/Y2025/V39/I5/23120166

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