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This paper investigates the use of non-metallic portion (NMP) reclaimed from e-waste (i.e., waste printed circuit board—PCB) as replacement of natural sand in the blended cement concrete by using Metakaolin (MK) as supplementary cementitious material for its effect on the mechanical, durability, microstructural, and mineralogical properties of concrete. It was found that the blended mixes containing NMP and MK outperformed the control mix. With the addition of 10% NMP and 10% MK, the maximum compressive strength was obtained, with the splitting tensile and flexural strength following the same trend. The performance of the mixes was lowered above 10% replacement levels, although it was still better than the control mixture. When compared to other mixes, 10% NMP and 10% MK concrete had the lowest sorptivity and water absorption values, as well as the highest resistance to chloride-ion penetration. FESEM was used to confirm the results, and then XRD was used to determine the elemental classification. This study lays the groundwork for a long-term strategy for utilising NMP and MK as extremely effective concrete additives.

The exponential development of the electronic industry and changes in people's lifestyle have increased the discarding rate of waste electronic appliances and electrical equipments rapidly. The disposal of electronic waste (e-waste) has become a serious challenge to developing and developed countries as toxic substances and heavy metals present in e-waste could harm human health and the atmosphere. From the perspective of environmental concerns, it is necessary to properly dispose or reuse e-waste in any forms to prevent pollution. In recent years, a growing number of studies are primarily associated with utilization of e-waste as construction materials. This paper provides a critical and comprehensive review of different types of e-waste which can be utilized as source material in the form of binder, fine/coarse aggregate, and fibre in the mortar, concrete, and precast products. More specifically, this review highlights the positive aspects, future research needs, and limitations of using e-waste in construction. Overall, it is suggested that e-waste offers huge potential benefits when it is utilized in construction products, thereby reduces e-waste management problems and saves the earth from environmental pollution.