Uniaxial Compression Performance of Recycled Brick Aggregate Concrete with Basalt Fibers and its Bonding Performance with Steel Bars

Abstract

This paper systematically analyzes the basic mechanical properties, uniaxial compression performance, and bonding performance of recycled brick aggregate concrete treated with basalt fibers with steel bars. The results show that the addition of recycled brick aggregate not only reduces the basic mechanical properties and uniaxial compression performance of recycled brick aggregate concrete but also reduces the bonding performance between concrete and steel bars. The addition of basalt fiber can increase the cube compressive strength and splitting tensile strength of recycled brick aggregate concrete by  18.66 % and  22.68 %, respectively,  and increase the uniaxial compressive stress and strain by
20.59 % and 11.11 %, respectively. Basalt fiber can effectively improve the bonding performance between recycled brick aggregate concrete and steel bars, increasing the peak bonding strength by 1.17 MPa and reducing the peak slip by 0.136 mm. A calculation model for the uniaxial compressive stress of basalt fiber recycled brick aggregate concrete and a calculation model for the bond strength between basalt fiber recycled brick aggregate concrete and steel bars were constructed.