BOND BETWEEN STEEL BARS AND SELF-COMPACTING AND ORDINARY CONCRETES SUBMITTED TO CYCLIC AND MONOTONIC LOADING

Abstract

At the moment it is increasingly common the use of high-strength concrete because of the durability and strength requirements. This requires higher reinforcement ratio which results in places with difficult cast. These regions generally are subject to the cyclic loading. In that way, it is necessary to develop a material that ensures the cross-section homogeneity as well as the bond with the reinforcement. Therefore, the self-compacting concrete became a technical alternative with great potential to achieve these required properties. The aim of this work is to compare the bond strength results between plain concrete (CC) and self-compacting concrete (SCC) when subjected to monotonic and cyclic loads. The experimental program used standard pull-out specimens and was used steel bars of 10 mm and 16 mm, in concrete compressive strength of 30 MPa at 28 days. The bond strength was evaluated by the pull-out tests under monotonic and cyclic loading. The results indicated that the pull-out tests are effective for analyzing the bond stress in the concretes used and conditions of the test. Furthermore, was verified that the SCC pull-out specimens have similar behavior to those in CC, and the diameter of the bar has significant influence on its rupture. Keywords: Bond, Pull-out, Self-Compacting Concrete, Monotonic Load, Cyclic Load.