Rehabilitation and Maintenance of Road Pavements using High Early Strength Concrete: Fid-Bau Portal

Rehabilitation and Maintenance of Road Pavements using High Early Strength Concrete

C. C. Fu / E. A. Larmie

The application of an optimized road pavement mix in road maintenance will lead to a substantial reduction in the user costs involved with delays in road closures. The Maryland State Highway Administration (MDSHA) currently requires the use of a 12-hour concrete mix for patching in heavily trafficked roadways in urban areas and wishes to decrease the current 12-hour period of strength gain to 4-hours. Under the sponsorship of the Maryland State Highway Administration, a series of tests on four four-hour mix designs selected from the SHRP C-373 report and one twelve-hour control mix currently used by the Maryland State Highway Administration was conducted with aim at selecting the best two four-hour mixes. This research uses choices of Type III High Early Strength cement and chemical admixtures on one hand and a low water-cement ratio and/or high conventional cement content on the other hand to attain early strength. A conclusive recommendation of a combination of these techniques and/or the individual techniques used based on a strength criterion (Compressive strength) and durability criterion (Freeze and Thaw) is made.