Blocking Harmful Chemicals: The Power of Sealants on Concrete
PFAS, or per- and poly-fluoroalkyl substances, present a significant environmental challenge. Originating from sources like firefighting foams, these substances can adhere to concrete, leading to potential environmental hazards.
Researching Sealant Solutions
Researchers explored the efficacy of various sealants to prevent PFAS leakage from concrete. Six different sealants were tested in laboratory conditions.
Epoxy Polymer: The Top Performer
- Efficacy: Excellent at preventing PFAS leakage.
- Advantages: High chemical and weather resistance, UV resistance, and water repellency.
Bitumen-Based Sealants: Effective but with Drawbacks
- Efficacy: Good at preventing PFAS leakage.
- Drawbacks:
- Flammable nature.
- Poor light reflection, making them unsuitable for indoor use.
Polymer-Based Sealants: Acrylic and Polyaspartic
- Efficacy: Effective at preventing PFAS leakage.
- Advantages: Similar to epoxy, they offer chemical and weather resistance, UV resistance, and water repellency.
Comprehensive Approach to PFAS Contamination
The solution involves not just preventing leakage but also stopping the spread of PFAS. A combination of surface and penetrative sealants is recommended for both new and old concrete structures.
Considerations for Sealant Selection
- Variability: Not all sealants are equally effective in all situations.
- Contextual Application: The choice of sealant should be tailored to the specific environmental and structural context.
Conclusion
The primary goal is to mitigate the environmental and health risks posed by PFAS. By carefully selecting and applying appropriate sealants, we can effectively manage PFAS-contaminated concrete.
