Abstract
This paper presents an experimental study to measure mechanical properties of bonded concrete specimens. The bond between freshly mixed and hardened concrete has been a concern in repair and retrofit projects as well as staged construction of concrete members. This concern has roots in the time-dependent behavior of concrete, beginning with early-age concrete and continuing with long-term performance and durability of concrete. Moreover, environmental conditions generally complicate the behavior of concrete and resulted deformations such as shrinkage and creep. Application of chemical adhesives and epoxies is a common technique to enhance the bond at the interface of old and new concrete elements. The presented methodology includes preparation of bonded specimens with application of grout and adhesive agents. Mechanical strengths of specimens have been reported based on compressive, tensile, flexural, and shear testing. Results indicate that bonding agents are more effective in tensile and shear behavior of bonded samples.
Highlights
Bonding between freshly mixed and hardened concrete is a major concern in repair, retrofit, and strengthening projects, as well as new projects with staged construction
The time-dependent behavior of concrete is a bonding concern when delays are present in the process of concrete placement, disregarding the intentional or incidental nature of the delay
This paper focuses on mechanical strengths of bonded specimens with application of selected adhesives and epoxies
Summary
Bonding between freshly mixed and hardened concrete is a major concern in repair, retrofit, and strengthening projects, as well as new projects with staged construction. These projects are often necessary due to poor design, problems in construction, or inadequate maintenance of structures. Strengthening aims to enhance the properties of existing members with the aid of new materials In these areas, the load transfers between new and old concrete through their interface, where bonded properly, as well as reinforcing dowels, where embedded adequately. This paper focuses on mechanical strengths of bonded specimens with application of selected adhesives and epoxies. Results provide insights on expected performance of these bonding agents
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