An Investigation of Mechanical Properties of Concrete by Applying Sand Coating on Recycled High-Density Polyethylene (HDPE) and Electronic-Wastes (E-Wastes) Used as a Partial Replacement of Natural Coarse Aggregates

Syed Nasir Abbas, Muhammad Irshad Qureshi, Malik Muneeb Abid, Muhammad Atiq Ur Rehman Tariq and Anne Wai Man Ng
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Syed Nasir Abbas: College of Engineering and Technology, University of Sargodha, Sargodha 40100, Pakistan
Muhammad Irshad Qureshi: Department of Civil Engineering, University of Engineering and Technology, Taxila 47050, Pakistan
Malik Muneeb Abid: College of Engineering and Technology, University of Sargodha, Sargodha 40100, Pakistan
Muhammad Atiq Ur Rehman Tariq: College of Engineering and Science, Victoria University, Melbourne, VIC 8001, Australia
Anne Wai Man Ng: College of Engineering, IT & Environment, Charles Darwin University, Darwin, NT 0810, Australia

Sustainability, 2022, vol. 14, issue 7, 1-23

Abstract: Plastic wastes are a major hazard for the environment and their use in the construction industry is increasing day by day. The major drawback of the use of plastic in concrete is an exceptional reduction in strength and workability. This research work explores the effect of sand coating on two types of recycled plastic aggregates, high-density polyethylene (HDPE) and electronic-wastes (E-wastes), as partial replacement of natural aggregates. The replacement ranged from 0% to 30% along with the use of super plasticizer SP-675 and wet lock sealant. Both recycled plastic aggregates are crushed, melted, and ground to convert them into aggregates of 20 mm size. The workability of concrete containing uncoated recycled plastic aggregates (HDPE and electronic wastes), SP-675, and wet lock sealant has been found to be higher than controlled concrete samples with 0% recycled aggregates. Compressive strength, split tensile strength, and flexural strength of such type of concrete is lower than the controlled concrete samples due to the weak bond between the plastic aggregates and Ordinary Portland Cement. After applying the sand coating to improve bonding, the workability is reduced compared to uncoated samples whereas the compressive strength, split tensile strength and flexural strength of the sand coated plastic aggregate concrete is higher than uncoated plastic aggregate concrete. There is a significant increase in workability of concrete after the addition of SP-675 when added as 2% by weight of cement. The wet lock sealant positively affects the strength properties of concrete. It is recommended that the durability of concrete containing uncoated and sand coated recycled plastic aggregates be further explored in future studies.

Keywords: electronic wastes; HDPE; sand coating; flexural strength; compressive strength; split tensile strength; SP-675; wet lock sealant (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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