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1- , n.heidarzadeh@gmail.com
Abstract: (73 Views)
This study aims to propose a novel practical procedure to use demolition waste as recycled concrete. Foam concrete with a density of 960 (kg/m3) was produced using fine-grained demolition waste. Instead of using traditional aggregates, two groups of demolition wastes, with gypsum (WG) and without gypsum (W), have been used in the mixture of the concrete at weight percentages of 30, 70, and 100. The applied experiments were flow table, unconfined compressive strength (UCS), and scanning electron microscope (SEM). Results showed that increasing the percentage of the replaced construction waste decreases the flow rate of the samples due to their high-water absorption. Moreover, the measured wet density of the recycled samples varies from 906 to 1022 (kg/m3). By replacing construction waste with sand by 30%, 70%, and 100%, the 28-day UCS respectively decreases by 36%, 23%, and 19.9%. The highest UCSs were observed in the S0W100 and S0WG100, with the average 28-day UCSs of 2.38 and 2.55 (MPa), respectively. Then, the amount of gypsum waste (6.6%) has no significant effect on reducing the UCS. The SEM results also showed that the average percentage of the pores resulting from the use of foam reagent has decreased by 17.6%, 18.6%, and 21.3% in samples with 100%, 30%, and 70% replacement of recycled materials, respectively. The present study suggests direct use of demolition wastes as produced before disposing of them.
Keywords: Lightweight foam concrete, Construction waste, unconfined compressive strength (UCS), wet density, scanning electron microscope (SEM), durability and stability, Mixed Recycled Aggregate
Type of Study: Original Research |
Subject:
Engineering Ecosystem
Received: 2026/01/1 | Accepted: 2026/06/2
Received: 2026/01/1 | Accepted: 2026/06/2
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