Behavior of Hot Rolled Steel Section and Axial Compressive Stress-Strain Relationship of Structural Lightweight Aggregate Concrete

Abstract

The lightweight aggregate-only concrete lacks the mechanical properties of regular concrete and is therefore unsuitable for structural applications. A hybrid aggregate system can be used to boost the performance of concrete by replacing some of the natural crushed stone with synthetic lightweight aggregate. Expanded shale was used as the artificial lightweight aggregate in the previous work to investigate the stress-strain relationship and the Poisson effect in concrete. The mechanical properties of concrete were investigated as a result of the experiment's use of four distinct volumes of shale aggregate. Peak stress and modulus of elasticity decreased as shale aggre- gate volume increased. However, the axial and lateral stresses associated with the peak stress also rise in proportion to the percentage of shale aggregate volume. The lateral strain-to-axial strain ratio showed a stronger Poisson effect the higher the concrete's concentration of shale aggregate. It is now possible to analytically define the stress-strain connection between lightweight aggregate and lightweight concrete.