The influences of granite industry waste on concrete properties with different strength grades

Abstract

The use of granite industry waste as a mixing material of concrete reduces not only the natural aggregate consumption, but also the solid waste disposal problems. This paper addresses the influences of recycled granite aggregate on the concrete properties. Both the low- (20 MPa) and high- (50 MPa) strength concretes were investigated for various sand replacing proportions with granite particles (namely up to 50 % by weight). The tests showed the concrete compressive strength was not affected by the inclusion of granite wastes as compared to conventional concrete. The results on the other hand revealed the reduction of concrete tensile strength with the 50 % proportion of granite wastes, where the effects were more pronounced in the low-strength concrete. The presence of granite particles also dropped the fresh concrete workability. The microstructure images of the granite waste concrete revealed the weakened interfacial transition zone between cement paste matrix and aggregate.

Keywords

• Recycled aggregate
• Granite particle
• Concrete materials
• Mechanical strength
• Microstructure