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Durability of Fiber Reinforced Concrete Pipe Exposed to Florida Aggressive Environments
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2020-06-01
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[PDF-92.23 MB]
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Alternative Title:Deliverable 10: Final Report: Durability of Fiber Reinforced Concrete Pipe Exposed to Florida Aggressive Environments: BDV27-977-11 [cover title]
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Edition:Final report, March 15 2016-June 15, 2020
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Abstract:Four different types of synthetic fibers were used in this investigation to prepare synthetic fiber-reinforced concrete resembling dry-cast concrete. The first two fiber types were polyvinyl alcohol (30 mm) and a blend of polypropylene and polyethylene (51 mm). The other two fibers were polypropylene (50 mm), one of the polypropylene synthetic fibers was surface treated to enhance the chemical bonding. The fiber loading ranged from 9 to 15 lb/yd³. Six different concrete mixes (two fibers were used with two different loadings) were prepared from which 30 beams and 30 cores were obtained per mix. Samples were obtained from these two geometries and exposed to various environments. Transport properties were obtained from control samples (exposed to high humidity) over a year. Surface resistivity, sorptivity, porosity and non-steady state migration coefficient tests were performed. The fiber presence did not seem to significantly affect the obtained values. The obtained values were compared to values obtained on concrete with similar compositions as part of a previous study. Beams, 1”- to 3”-thick slices, and core samples were subjected to five environmental exposures. Two of these were control exposures: high humidity and immersed in calcium hydroxide at a moderate elevated temperature. The aging took place on samples that were immersed all the time in intercoastal waters (at the barge) and wet and dry cycles (one week wet and one week dry) immersed in seawater and in seawater with the pH adjusted to a value of 4.5. Both latter exposures were performed at 36°C when immersed in solution. Compression, split tensile test, and residual strength testing took place after 8 and 16.5 months of exposure. No significant degradation was observed. A modified split tensile test was performed on square and round samples after 8, 16.5, and 20 to 24 months of exposure. A few of the samples immersed in intercoastal waters appear to have suffered degradation. A few of the samples immersed in seawater adjusted to low pH also appear to have degraded. Visual inspection took place after splitting open the samples.
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