This report describes the installation and condition of the first two very-early-strength latex-modified concrete (LMC-VE) overlays to be constructed for the Virginia Department of Transportation. The overlays were prepared with a special blended cement rather than the type I/II cement used in the conventional latex-modified concrete (LMC) overlay. Mixture proportions, installation equipment, and procedures are similar to those used for conventional LMC overlays with the exception that the contractor must work faster because the concrete loses slump rapidly and the curing period is only 3 hours rather than 72. Tests of the compressive strength of the LMC-VE overlay performed during the early hours after installation indicated that traffic could be placed on the overlay within 3 hours rather than the 4 to 7 days required for the conventional LMC overlay. Tests of the bond strength and permeability to chloride ion indicate that the overlays are performing satisfactorily. Pending continuing favorable test results, it is anticipated that LMC-VE overlays can be used in situations in which it is desirable to accelerate construction, to reduce inconvenience to motorists, to allow for installation during off-peak traffic periods such as at night, to provide a more rapid cure in cold weather, to provide low permeability (compared to concrete without latex), and to provide high strength, particularly, high early strength.
The final report presents information collected by ODOT personnel from bridge deck overlays constructed in Oregon between 1989 and 1995. Decks were pl...
Oregon State Highway Division, Materials and Research Section
1990-11-01
Abstract:
Laboratory studies have shown that microsilica concrete (MC) has sufficient strength and impermeability to substitute for Latex modified concrete (LMC...
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United States Department of Transportation
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