Abstract
Every year, millions of tons of waste glass are generated all over the world and disposed in landfills. Utilization of this waste by substituting a certain share of cement in cement mortars can contribute to the reduction of environmental pollution in two aspects: the utilization of waste and the reduction of the cement content in cement-based mortars. The cement industry is responsible for approximately 6% of global CO2 emissions. Seven different mortar mixes, containing between 0% and 30% of waste glass powder added by weight of cement, were analyzed. The following physical and mechanical properties of the mortar mixes were measured: compressive strength, flexural strength, and density. The test results revealed that waste glass powder can be used in small amounts in cement-based mortars to reduce the amount of cement and to utilize waste glass. A higher performance, modified cement-based mortar can be produced for civil engineering applications by replacing 5% with waste glass powder. The linear regression equations obtained illustrate the relationships between the density and compressive strength, and between density and flexural strength at 28 days.
Highlights
In day-to-day life, glass is used in construction, soft drink bottles, medicinal bottles, vehicles, mirrors, windscreens, doors, windows, decorative items, tube lights, bulbs, and other electronics items
The tested mortar mixes were made from Portland cement CEM I 42.5 R and waste glass powder of the following chemical composition: 68.7% of SiO2 ; 12.18% of Al2 O3 ; 3.95%
The tested waste glass powder has the particle size of 15.1 μm. 90% of the particles were smaller than 29 μm, 50% were smaller than 1385 μm, and 10% were smaller than 2.69 μm. 0/4 fraction sand was used for the tests, with particle density of 2488 kg/m3, and bulk density of 1643 kg/m3
Summary
In day-to-day life, glass is used in construction, soft drink bottles, medicinal bottles, vehicles, mirrors, windscreens, doors, windows, decorative items, tube lights, bulbs, and other electronics items. Glass has a limited life span, so after completion of its utility period, it is either stock piled or sent (non-recycled) to landfills. Non-degradable waste has been a major issue in the 21st century. The disposal of waste glass in landfills is not an environmentally friendly solution because glass is non-biodegradable waste [1]. Production of cement (the binder in concrete) is an energy-intensive and highly pollutive process, which contributes about 5–8% to the total global CO2 emissions. Many studies have been focused on the use of waste glass in concrete as an aggregate replacement [2,3]
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