Driving Future Mobility
October 07, 2022
New research from Trinseo strongly suggests that the pour window for Latex Modified Concrete (LMC) can be expanded, giving DOTs and contractors significant flexibility in starting and completing projects in the early spring and late fall.
For over 50 years, Latex Modified Concrete (LMC) based on Trinseo’s Modifier A™/NA Latex has been used successfully as a thin overlay for rehabilitation of old, worn-out bridge deck surfaces.
State Departments of Transportation (DOTs) have established specifications for placing LMC including limits on installation temperature. The specified temperature range for installing LMC is typically 50 to 85°F. The low temperature limit of 50°F for placing bridge deck overlays results in a shorter pour season for many regions of the country.
In 2016 Trinseo published a research report showing robust performance of LMC at the low end of the temperature specification (50°F). The research presented in this webinar was designed to evaluate performance of LMC when cured at lower temperatures of 35, 40, and 45°F, compared to performance when cured at 50 and 72°F.
LMC cured at the lower temperatures showed excellent compressive strength, bond strength and chloride ion penetration resistance. Results of this work strongly suggest that the pour window for LMC based on Modifier A/NA latex can be expanded to seasons when ambient temperatures may be below 50°F.
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