Nebraska LTAP
Title
Investigating the Interaction of NDOT Hot-Pour PCC Joint Sealant and Penetrating Concrete Sealers
Date of this Version
2019
Document Type
Article
Citation
Barrett, B., Byre, D., Helen, W., Halsey, L., and Hansen, D. (2019). Investigating the Interaction of NDOT Hot-Pour PCC Joint Sealant and Penetrating Concrete Sealers. NDOT Research Report.
Abstract
Based on the field observations on NE-83, PCS potentially impacts the bond between the concrete and hot-pour sealant after application. If penetrating sealers break the interfacial bond after application, concrete pavements could become compromised and subject to freeze-thaw damage, chloride attack, and other deleterious effects.
The results show that discoloration occurred when applying the five PCS products to the NE-3405 hot-pour sealed testing blocks. All three test methods of application; spraying, 1-min, and 5-min soaks, caused discoloration. The level of discoloration increased with the duration of contact with the PCS. Despite discoloration, none of the five PCS products caused de-bonding issues during extension testing which concludes that the PCS products do not deteriorate of the interfacial bond between NE-3405 hot-pour sealant and concrete surfaces. Maintenance crews and contractors should be advised that some discoloration is normal and should not cause concern.