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Prof. Dr. Harald Justnes

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Assistant Guest Editor

SINTEF Community, 0314 Oslo, Norway
Interests: new materials in concrete

Prof. Dr. Rein Terje Thorstensen

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Assistant Guest Editor

Department of Engineering Sciences, University of Agder, 4604 Kristiansand, Norway
Interests: new materials in concrete

Prof. Dr. Christian J. Engelsen

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Chief Guest Editor

SINTEF Community, 0314 Oslo, Norway
Interests: recycling of C&D waste; environmental impact assessment

Special Issue Information

Dear Colleagues,

The scope of the current Special Issue is the latest highlights of the recycling of concrete and recycled materials in concrete. It will therefore cover recycled aggregates from concrete, alternative materials used in concrete and the potential technical and environmental constraints faced in a circular life. The latter is important because new products need to fulfil user criteria in their primary service life and the following recycling life cycle.

Prof. Dr. Christian J. Engelsen
Prof. Dr. Harald Justnes
Prof. Rein Terje Thorstensen
Guest Editors

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Keywords

recycled aggregates
alternative materials
sustainability

Published Papers (1 paper)

Research

23 pages, 9573 KiB

Open AccessArticle

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

by Syed Nasir Abbas, Muhammad Irshad Qureshi, Malik Muneeb Abid, Muhammad Atiq Ur Rehman Tariq and Anne Wai Man Ng

Sustainability 2022, 14(7), 4087; https://0-doi-org.brum.beds.ac.uk/10.3390/su14074087 - 30 Mar 2022

Cited by 5 | Viewed by 2230

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. Full article

(This article belongs to the Special Issue Use of Recycled Concrete Materials)

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