United States Department of Transportation
i
Bond Performance of 1.125 Inch Diameter Prestressing Strands
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2020-02-01
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[PDF-15.08 MB]
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Edition:Final Report, 12/15/2017 – 9/30/19
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Abstract:Experimental research addressing the bond performance, transfer and development length of 1-1/8 in. diameter grade 250 strands to concrete is presented in this report. Three different bond testing methodologies were employed to appraise the pullout force values of the strands in concrete and mortar, namely the Large Block Pullout Test (LBPT), the ASTM A1081 test, and non-prestressed square concrete prisms. The results revealed that the 1 1/8” diameter strands exhibit good bonding quality to normal weight concrete and mortar, though there is limited information for comparison. Eight full-scale beams were tested to evaluate the development length, prestress loses, and flexural performance of large diameter strands. The transfer length measurements were determined by analyzing the concrete surface strain readings and their corresponding strain profiles employing the 95% AMS method. It was found that current code equations overestimate transfer length for the 1-1/8 in. diameter strands. The beams were also employed to assess the development length of the strands and it was determined that current code may overestimate 1-1/8 in. diameter strands in the concretes tested.
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