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PCI Journal

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Self-consolidating concrete (SCC) is becoming increasingly popular in the precast/prestressed concrete industry in the United States. However, there have been concerns regarding the bond strength, transfer length, and development length of prestressing strands and mild steel reinforcement with SCC. Further, there are no design guidelines for using SCC. In this study, a literature survey on the bond strength of SCC was conducted. Moustafa pullout tests were performed to determine the bond strength of 0.6 in. (15.2 mm) pretensioning strands with sec. The transfer lengths of three pretensioned concrete bridge girders were measured using Demec points. Pullout tests were also performed on 41 specimens using No. 4, No. 6, and No. 8 mild steel reinforcing bars and 0.6 in. prestressing strands. All the tests were performed using specimens cast with both SCC and conventional concrete. Test data have shown that the bond strength of sec with deformed reinforcing bars is adequate. However, the use of viscosity-modifying admixtures in sec may adversely affect its early compressive strength and its bond strength with pretensioning strands.

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