EXPERIMENTAL RESEARCH ON RETARD-BONDED PRESTRESSED CONCRETE BEAMS

Retard-bonded post prestressed concrete is a new distinctive prestressed type. It absorbs the good parts and abandons unfavorable parts of un-bonded and bonded in traditional post prestressed concrete. Based on a large number of orthogonal tests and theoretical analyses, a kind of super-retarding mortar which meets the requirements of retard-bonded prestressed concrete is prepared and used for the retard-bonded post prestressed concrete system. The prestressed camber, as well as strain variations of concrete and prestress losses of retard-bonded post prestressed concrete beams were studied through the experiment of 4 beams. The experimental results were compared with the theoretical results, by which the principle and law of prestress losses of retard-bonded post prestressed concrete beams were obtained. It provides the reference for the actual project application of the new retard-bonded prestressed concrete system.