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The Determination of the Permeability, Density, and Bond Strength of Non-Metallic Fiber Reinforced Concrete in Bridge Deck Overlay Applications
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2000-07-30
[PDF-13.59 MB]
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Edition:Final Report
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Abstract:This final report presents the procedures and results of the rapid chloride permeability, density, and bond strengths of cores taken from non-metallic fiber reinforced concrete (NMFRC) and plain low slump dense concrete (LSDC) bridge deck overlays constructed earlier on the bridge at Exit 212 over I-90 (I-90/US 83), and Exit 32 on I-90 (I-90/SD-79). Both the field in-place and laboratory bond tests were done for the cores drilled in the field. The density and chloride permeability were also determined for the concrete specimens cast in the laboratory with 5 different compacting efforts, for each different concrete used in the construction of the above referred bridge decks. A comparison of the results from the field and laboratory mixes showed that there was good bond between the overlay concrete and the old concrete and the bond strength was greater than the tensile strength of the old concrete, because in all cores the failure was in the old concrete. The chloride permeability and density values of NMFRC were found to be almost similar to the values of the plain LSDC. This was true in both field and laboratory tests. The chloride permeability mainly depended on the cement content and compacting effort used in making the cylinders. The addition of fibers did not influence the chloride permeability and density of the concrete. Recommendations were made regarding the equipment and testing procedures necessary for designing the NMFRC mix, and equipment and testing procedures required for quality control in the field.
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