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|The effects of the construction process on selected fresh and hardened properties of roller-compacted concrete (RCC) pavements
|United States. Army. Corps of Engineers. Europe District.
Pittman, David W.
Roller-compacted concrete (RCC)
|Geotechnical Laboratory (U.S.)
Engineer Research and Development Center (U.S.)
|Miscellaneous paper (U.S. Army Engineer Waterways Experiment Station) ; GL-89-22.
Abstract: In October 1986, a 16, 500-sq-yd roller-compacted concrete (RCC) pavement tank hardstand was constructed at Harvey Barracks in Kitzingen, West Germany. This report discusses the effects of the construction process, particularly the laydown and compaction, on the strength, density, smoothness, and surface texture of the RCC pavement hardstand at Kitzingen. The strength of the RCC was measured by conducting flexural and splitting tensile tests on beams and cylinders fabricated in the laboratory and extracted from the pavement. From the fabricated beams it was determined that the flexural strength decreases with decreasing density. The density of the RCC pavement was measured by conducting nuclear density gauge tests on the in situ RCC and by extracting cores from the pavement and determining the unit weight. It was determined that the density of the RCC pavement decreases close to an unconfined edge, that delayed compaction of joints results in decreased density, that the density decreases with pavement depth, and that the density increases with increasing roller passes. From observation of the laydown and construction procedure and measurement of the longitudinal, transverse, and joint smoothness with a straightedge, it was determined that delayed compaction of the joints results in larger smoothness measurements, that maintaining paver continuity results in smaller longitudinal smoothness measurements, that stopping vibratory rollers on the fresh RCC surface results in larger longitudinal measurements, and that overlapping of vibratory roller passes results in larger transverse smoothness measurements. From observation of the laydown and compaction procedure and the surface texture, it was determined that broadcasting of loose RCC over the pavement surface results in a coarser texture, that the RCC moisture content can affect the ability of the rollers to finish the surface, and that the rubber-tired roller is effective in tightening surface voids and fissures.
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