Abstract
This investigation includes the use of 15% of glass wastes as a partial substitution to cement in combination with plastic wastes as volumetric replacement to natural coarse aggregate to produce sustainable concrete. Different volumetric replacements of plastic waste to natural coarse aggregate (25%, 50%, 75%, and 100%) were used in concrete containing 15% glass powder as a replacement by weight of cement. Generally, the results show that the inclusion of 15% glass powder improves the compressive strength, splitting tensile strength and flexural strength by about 13.3%, 36.3%, and 34.7%respectively at 60 day age in comparison with reference concrete without wastes, also the results show a decrease in water absorption and an increase in dry density. The inclusion of plastic waste aggregate in the presence of 15% glass powder leads to a decrease in the compressive strength, flexural strength, splitting tensile strength, dry density, ultrasonic pulse velocity, and thermal conductivity. The percentage reductions are 59.8%, 46.3%, 43.6%, 20.5%, 28.6%, and 54.4% respectively for concrete specimens that including 100% plastic waste coarse aggregate in comparison with concrete specimens without plastic waste aggregate.
Highlights
The concept of sustainability is very important in the construction industry
The results indicate that concrete specimens containing 100% high density polyethylene (HDPE) plastic waste aggregate and with 15%, glass powder waste has a dry density of 1862.4kg/m3
The inclusion of plastic waste coarse aggregate significantly decreases the compressive strength of concrete
Summary
The concept of sustainability is very important in the construction industry. It is known as ensuring the complacency of the present requirements without permuting the ability of future generation [1]. The chemical composition of these materials mainly contains reactive silica that reacts with Ca (OH) 2 (one of the hydration products of cement) to produce additional gel, which improves some properties of concrete [5, 6] Some types of these materials are by– products from industry. The use of different waste materials (recyclable Portland cement concrete, plastic, brick and others) as aggregate in concrete industry can consume huge quantities of these materials. In this case, the problems of consume aggregate in construction sites, and environmental pollution problems can be solved. The inclusion of plastic waste as aggregate in concrete can significantly improve some properties of concrete, because plastic has low thermal conductivity, low density, good abrasion resistance and high toughness
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