A large fraction of concrete in service is partly saturated and the fluid absorption and external dissolved salt ingress are hence responsible for various deteriorations of concrete, such as freezing and thawing, sulfate attack, deicing salt damage, corrosion of steel reinforcement, scaling, carbonation, and alkali-silica reaction. To reduce the fluid absorption and external salts ingress, various approaches have been studied.
Although these previous investigations showed promise, the high cost, low performance and toxicity of currently used sealants are still key barriers to their widespread applications in transportation infrastructures. The shortcomings include air-polluting of the volatile organic compound during manufacturing and service processes, the restrained release of vapor pressure when using organic agents, low strain resistance of penetrating sealers, the low scratch-resistance of acrylics, high moisture sensitivity of polyurethanes, cracking, peeling nature, and the high sensitivity to ultraviolet light of epoxy coatings.
More importantly, these traditional sealants are synthesized based on unsustainable or even toxic chemical materials with volatile organic compounds or high macromolecule structures. To extend the service life of concrete in a green way, sustainable sealants with high renewability, low environmental impact, and biodegradability are critically needed.
The overall objective of this project is to address the aforementioned critical challenges and to effectively extend the service life of concrete structures and pavements by developing a biomass-based sealant.
Technical Committee Members
- TC Chair: Joseph Stillwell, Maine Department of Transportation
- Bao Chuong, Connecticut Department of Transportation
- Richard Mulcahy, Massachusetts Department of Transportation
- Dan John, New Hampshire Department of Transportation
- Michael Sock, Rhode Island Department of Transportation
AC Liaison: Ulrich Amoussou-Guenou, Maine Department of Transportation
Project Coordinator: Kirsten Seeber, CTC & Associates