Bond Stresses between Reinforcing Bar and Reactive Powder Concrete

Abstract

A good performance of reinforced concrete structures is ensured by the bond between steel and concrete, which makes the materials work together, forming a part of solidarity. The behavior of the bond between the reinforcing bar and the surrounding concrete is significant to evaluate the cracking control in serviceability limit state and load capacity in the ultimate limit state. In this investigation, the bond stresses between reinforcing bar and reactive powder concrete (RPC) was considered to compare it with that of normal strength concrete (NSC). The push-out test with short embedment length is considered in this study to evaluate the bond strength, bond stress-slip relationship, and bond stress-crack width relationship for reactive powder concrete members. The compressive strength of concrete, the nominal diameter of reinforcement, concrete cover, and amount of steel fibers and embedded length of reinforcement were considered as variables in this study.
 The test results show that the ultimate bond stress increased with increasing of the compressive strength of concrete, decreasing the nominal diameter of the reinforcing bar, increasing the concrete cover and increasing steel fiber content. In a bond stress-slip relationship, the NSC specimen shows a very short softening zone after reaching the peak point in comparisons with RPC specimen. In RPC, bond stress-slip relationship shows stiffer behavior when the steel fiber content was increased. RPC shows stepper softening zone due to the presence of steel fiber, and the absence of steel fiber cause push-out failure without descending part after peak point. Using NSC instead of RPC in anchorage between reinforcement and concrete, decrease the crack width produced due to radial tensile stresses through the push-out of reinforcing bar. In RPC, the absence of steel fiber, decrease the nominal diameter of the reinforcing bar, increase the concrete cover, decrease the embedded length of reinforcing bar cause push-out failure and vice versa cause splitting failure.

The Effect of Different Curing Methods on the Properties of Reactive Powder Concrete Reinforced with Various Fibers

“…The mechanism of bonding is activated when the cracks are crossed by conventional reinforcement. The latter links the two surfaces of the crack and their stress is distributed into the concrete [18]. Authors in [19] studied the compressive strength of RPC reinforced with fibers.…”

Influence of the addition of glass from long neck bottles in the properties of the reactive powder concrete

“…In the near future, designing concrete structures with compressive strength lower than group I by ABNT NBR 8953 (ABNT, 2015), i.e., up to 50 MPa, will be uneconomical, especially when it comes to tall buildings, bridges and overpasses of large spans. The demands of civil construction have been requiring the development of new materials due to the need for greater load capacity, greater durability, lower cost, and with necessary characteristics for its application (Al-Quraishi et al, 2018).…”