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- W67710011 abstract "Latex-modified concrete (LMC) overlay production requires the use of volumetric mixers. LMC overlays provide enhanced protection against concrete bridge deck reinforcing steel corrosion induced by chlorides and have low permeability. Reinforcing LMC overlays with glass, natural, or synthetic fibers could increase durability even more. When compared to normal concrete mixtures, those with added glass, natural, or synthetic fibers have reduced plastic shrinkage cracking. Consistent fiber distribution in concrete mixtures using volumetric mixers has been a challenge, however. The authors discuss development of a fiber feeder system for use with volumetric mixers which has successfully produced fiber-reinforced LMC mixtures. The feeder, which can be adapted to any volumetric mixing truck, chops alkali-resistant glass fiber rovings to the desired length (current length options are 12.5, 19, and 25mm) and discharges them uniformly onto other ingredients before mixing. With fibers uniform and of a density close to that of concrete, air entrapment, balling, floating, and related problem do not occur. Fiber-reinforced LMC mixture mechanical properties and specimen size effects on flexural and compressive strengths have been evaluated. Test casting of one plain LMC and two fiber-reinforced LMC mixtures with target material properties of the LMC mixture in compliance with Illinois Department of Transportation requirements are presented. Adding 0.6 and 1.2 kg/m3 of glass fibers to LMC seems to have a small effect on compressive and flexural strengths, but does not seem to reduce shrinkage." @default.
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- W67710011 date "2007-03-01" @default.
- W67710011 modified "2023-09-26" @default.
- W67710011 title "Glass Fiber-Reinforced Latex-Modified Concrete: Using a Volumetric Mixer for Production of Overlays" @default.
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