Ninik Catur E. Y, Sri Murni Dewi, Wisnumurti Wisnumurti, Ari Wibowo


One of the requirements that must be met in the design of reinforced concrete construction is to achieve a perfect bonding between reinforcement and concrete. A perfect bonding ensured a composite action between reinforcement and concrete. The Implementation of the precast construction method leads to a mechanism that is not a monolith between steel and concrete. This condition can affect the lack of coherence which can lead to slip. In this study, the 30 concrete cylinders in 150 x 300 mm are used as pull out test specimens. On each specimen grown mounted on a steel reinforced sleeve pipe. In the sleeve pipe is inserted grouting material. Specified variables are the length of embedded, grouting thickness, and surface roughness of the sleeve pipe. The results of the study showed that the length of embedded of reinforcement a strong effect on the bond capacity. In undefined reinforcement, failure occurs due to slip between the reinforcement with a layer of grouting. While the grouting thickness and roughness together a strong effect on the bond capacity. The best results are given by specimens that grouting reinforcement with a layer thickness of 35 mm with a rough surface of the sleeve. Failure happens to resemble a failure on deformed steel reinforcement which is embedded directly in the concrete, reinforcing steel that is breaking up after passing the yield stress limit and the ultimate stress.

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