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A R T I C L E I N F O A B S T R A C T Article history: Received: 07 December, 2020 Accepted: 24 February, 2021 Online: 10 March, 2021 This study tests the feasibility of manufacturing concrete blocks made of recycled materials. The paper is an extension of work originally presented in ASET conference in Dubai. The paper, depicts and analyzes how the characteristics of the blocks (strength/durability) are affected by the presence of recycled concrete ingredients (recycled aggregate (RA)) and recycled water (RW). The recycled materials (RA and RW) were mixed in 16 different configurations; from each one 10 samples were prepared for testing. In each concrete configuration the RA and RW gradually replaced the fresh materials at 25%, 50%, 75%, and 100%. The RA moderately impacted the bearing capacity but significantly impacted the durability. The results show that using recycled aggregate decreases the bearing capacity by 22% (at the 100% replacement), and the recycled water slightly affected the bearing capacity (at the 100% replacement). To boost the durability, the ground granulated blast furnace slag (GGBS) was used, in the concrete mix, instead of the ordinary Portland cement (OPC). The GGBS was used at 3 magnitudes: 25%, 50%, and 75% of OPC. As a result the carbon foot-print footprint (1000 kg/m) was significantly lowered. Besides, the strength and durability of the blocks are reasonably enhanced. Generally, producing blocks from recycled materials is economical and feasible. The use of GGBS helps to lower the carbon footprint and enhance the strength and durability.

Green Blocks Made of Recycled Construction Waste using Recycled Wastewater