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Using an Innovative Bifunctional Siloxane to Protect Cement Composite Surfaces from Biological Corrosion
Marta Thomas1, Joanna Karasiewicz2, Paulina Nowicka-Krawczyk3
1Faculty of Civil and Transport Engineering, Institute of Building Engineering, Poznan University of Technology, 60-965 Poznan, Poland.
International Journal of Molecular Sciences
|June 13, 2025
Summary
This study shows a new polysiloxane coating (L43) effectively protects concrete from biocorrosion. The environmentally friendly coating maintains concrete strength and inhibits microalgae growth without harmful biocides.
Area of Science:
- Materials Science
- Environmental Science
- Civil Engineering
Background:
- Concrete surfaces are susceptible to biocorrosion, impacting structural integrity.
- Existing protective methods may involve harmful biocides or hinder material breathability.
Purpose of the Study:
- To evaluate the efficacy of a bifunctional polysiloxane (L43) in preventing concrete biocorrosion.
- To assess the impact of L43 on concrete's mechanical properties and microalgae growth.
Main Methods:
- Coating cement samples with L43.
- Testing compressive strength before and after cyclic freeze-thaw tests.
- Measuring microalgae photosynthetic activity (chlFI) on coated surfaces.
Main Results:
- L43-coated samples maintained high compressive strengths (exceeding 70 MPa).
- Freeze-thaw resistance was demonstrated, with strengths over 33 MPa.
- A 5% concentration of L43 significantly reduced microalgae photosynthetic activity (chlFI by ~70%).
Conclusions:
- Compound L43 provides effective biocorrosion protection for concrete.
- The polysiloxane coating preserves substrate integrity and allows air circulation.
- L43 offers an environmentally friendly alternative to traditional biocides.
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