Influence of waste glass powder and crushed cobblestone on mechanical properties of concrete

Abstract

This research includes the study of the mechanical properties of normal concrete and concrete made of waste aggregates, such as stress-strain behavior and flexural strength. The waste aggregate contains fine waste glass powder and waste crushed boulders (cobblestone type) as coarse aggregate. The stress-strain behavior shows higher values of compressive strength and modulus of elasticity and larger area under stress-strain curve comparing with ordinary concrete which is containing ordinary aggregates. Also, the flexural strength is increased when using waste aggregates. The most benefit of this study is the cost decrease of concrete and clean environment by using waste materials in addition to higher values of compressive and flexural strengths. Total replacement of normal aggregate with waste aggregate gives the largest area under stress-strain curve. Compressive strength is increased from 36.4 MPa for control mix to 43.1 MPa for total replacement. The modulus of elasticity was about 30.6GPa for waste aggregate concrete of total replacement whereas in the normal aggregate concrete it was 26.4 GPa. In normal concrete, larger area under stress-strain diagram for waste aggregate concrete is achieved and that means higher toughness concrete. Also, high strength concrete is achieved by 75% and 100% replacement of normal aggregate with waste glass and cobblestone, respectively. The study includes the freezing-thawing cycles effect on concrete and the results show higher strength by using crushed glass and cobblestone aggregates. The aim of this study is to improve mechanical properties of concrete and durability of concrete to freezing and thawing by using waste glass aggregate and crushed cobblestone.

Investigation of the performance of cement mortar incorporating lithium slag as a super-fine aggregate

“…Concrete is the most used construction material, and there is a high potential to improve existing products and recycle waste material into new and useful products (Hlobil et al, 2022). Waste materials such as bottom ash, waste marble, waste crushed tile, and fly ash (Wang et al, 2022) have been evaluated for use as fine aggregate in cement mortar and concrete (Abebaw and Vadivu, 2021;Al-Lebban et al, 2021). For example, Singh and Siddique (2014) investigate the usability of bottom ash as a fine aggregate in cement-based concrete.…”