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Study on the Resistance of TiO2-Attapulgite Composite Coating on Concrete Surface to Freshwater Mussel Erosion

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  • (a.School of Transportation and Logistics Engineering, b.State Key Laboratory of Maritime Technology and Safety,Wuhan University of Technology, Wuhan 430063, China)
BAI Xiuqin (1971-), Ph.D., Professor, Research Focus: Ship Tribology, Antifouling and Anti-Corrosion Technology, etc., E-mail: xqbai@whut.edu.cn

Received date: 2024-02-27

  Revised date: 2025-03-13

  Accepted date: 2025-03-15

  Online published: 2025-06-10

Supported by

Innovation and Development Joint Fund Key Project of Hubei Provincial Natural Science Foundation (2022CFD029); Major Program (JD) of Hubei Province (2023BAA003)

Abstract

Freshwater mussels are common large fouling organisms in freshwater.They easily attach to the concrete surfaces of water-conservancy structures and damage the concrete.Coating protection is an effective method to prevent erosion by freshwater mussels.In this study,a TiO2-ATP composite coating was fabricated by air spraying after modifying epoxy resin with hydroxyl-terminated polydimethylsiloxane (H-PDMS)and loading it with titanium-dioxide (TiO2) nanoparticles and attapulgite (ATP) microparticles.A 30 d freshwater mussel erosion test was conducted,and the protective performance of the coating was evaluated by environmental scanning electron microscopy,thermogravimetric analysis, high-performance automatic mercury porosimetry and an electronic universal testing machine.Results showed that the surface contact angle of the TiO2-ATP composite coating reached 138.7°±1.6°.The water-absorption ratios of concrete specimens protected by the coating were recorded as 0.08%and 0.13%after 24 h and 48 h immersion, respectively.After 30 d of erosion, the coated specimens suffered a mass loss of 3.71%, exhibited a porosity of 10.21%, and displayed a compressive strength 22.76%higher than that of uncoated specimens.These findings demonstrated that the TiO2-ATP composite coating effectively delayed calcium leaching from concrete, prevented erosion by freshwater mussel byssus, reduced water penetration, and markedly enhanced the durability of the concrete structure.

Cite this article

YUAN Xianfu, YANG Zongcheng, HE Xiaoyan, LIU Yuhan, BAI Xiuqin . Study on the Resistance of TiO2-Attapulgite Composite Coating on Concrete Surface to Freshwater Mussel Erosion[J]. Materials Protection, 2025 , 58(5) : 153 -160 . DOI: 10.16577/j.issn.1001-1560.2025.0087

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