Effects of waste electronic plastic and marble dust on hardened properties of high strength concrete

In this experimental study, the effects of using waste electronic plastic (e-plastic) and waste marble dust (MD) on the mechanical properties and behavior of High Strength Concrete were investigated. For this purpose, 17 series of concrete mixtures with a water/cement ratio of 0.40 were prepared. Shredded e-plastic was used as an aggregate to replace natural aggregate at proportions of 0%, 10%, 20%, 30% and 40% by volume. The size of the e-plastic ranged between 0 and 14 mm. In addition, MD finer than 300 mu m was used as an additive at proportions of 0%, 5%, 10%, and 15% by weight of cement. The unit weight, compressive and splitting tensile strength values, modulus of elasticity, stress-strain relationship, toughness and permeability of the mixtures were determined. Test results showed that strength values, modulus of elasticity and unit weight of the test mixtures were lower than those of the control concrete. It is important to note that the least reduction in compressive strength and toughness occurred at 20% e-plastic replacement compared to those of the control mixture. The tensile strength, modulus of elasticity and unit weight directly decreased with the increasing e-plastic content. On the other hand, the addition of MD slightly improved the properties and performance of the concrete. (C) 2020 Elsevier Ltd. All rights reserved.