Long-term protection of bridge-deck systems with structural latex-modified concrete overlays

Latex-modified concrete (LMC) overlays have performance characteristics that are superior to microsilica concrete (MSC) overlays and other overlay types. LMC provides unique features that are critical for fulfilling the functionality of the overlay. Polymerization of the latex creates a membrane around the LMC particles, resulting in a low-permeable product with inherent flexibility to accommodate freeze-and-thaw stresses. LMC overlays adhere properly to the deck substrate and have high early-age strength that allows for opening to traffic early. Toughness characteristics can be enhanced by adding synthetic fibers to the LMC to eliminate the possibility of early- age shrinkage cracking and to provide crack-arresting capabilities. Accordingly, the fibrous LMC overlay is the best overlay choice to ensure long-term durability with appropriate functionality.