Different Concrete Types Affecting the Bond Strength and Interfacial Joints between New and Old Concrete

Abstract

The connections between concrete layers of different ages may occur in a wide range of situations, from structures rehabilitation and repairs to the construction of new buildings. This research represented an experimental study of shear forces across the joint between different concretes forming a composite action. To better understand the bond mechanism at the interface between different concrete types and old and new concrete surfaces. Overlaid specimens were fabricated to measure shear bond strength at different ages. Different parameters and a significant influence on the bond strength will be presented to evaluate the shear capacity at the interface including (the shear force for three types of the concrete cast at the same time, the shear force for three types of the concrete cast at a different time and study the effect of steel fiber on bonding mechanism). The experimental work was verified with numerical analysis carried out using ANSYS software. The general behavior of the finite element models shows a proved compatibility with the experimental test results.