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Abstract

In many parts of the world, substantial energy is used to maintain comfortable temperatures in inner parts of the buildings for living and working. Construction materials with low thermal conductivity, if used in the exterior walls and façade etc. in such structures can be useful in lowering the energy demand. On the other hand, moisture ingress through sorption is a common factor contributing in degradation of concrete structures with time. Constituents of concrete may be engineered to some extent to get both the desired attributes, lower thermal conductivity and sorption than normal concrete. The rapid increase in electronic waste, or e-waste, presents a major environmental challenge in today's world, with plastic components comprising a substantial portion of this waste. Utilizing e-waste plastic in concrete presents a sustainable solution with waste utilisation while conserving natural resources for aggregates. The experimental work presented in the paper explored the use of E-waste scrap (PA) comprising of discarded computers, printers, and mobile phone as coarse aggregates. The waste sized to 4.75–20 mm was used in concrete mixes. It replaced NA at levels of 0%, 33%, 66%, and 100%. Test results presented in the paper illustrates progressive reduction in thermal conductivity and sorptivity with increasing percentage replacement of the crushed rock aggregates by E-waste aggregates. Paper also presents that thermal conductivity follows a multilinear relationship with water-cement ratio and percentage replacement of the aggregates in concrete.

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