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Self compacting concrete containing coarse recycled concrete aggregate an eco-friendly material

By: Contributor(s): Publication details: Thane ACC LTD 2024Edition: Vol.98(7), JulDescription: 20-31pSubject(s): Online resources: In: Indian Concrete Journal - ICJSummary: Utilization of recycled aggregates (RA) extracted from construction and demolition waste (CDW), for production of cement concrete, is a viable way to effectively dispose this waste and promote sustainability. This paper presents the experimental test results on the flow, mechanical and durability properties of a self compacting concrete (SCC) containing unprocessed coarse recycled concrete aggregate (CRCA) extracted from CDW. A SCC with a compressive strength of 40 MPa was prepared for the purpose. An aggregate mixture, containing CRCA and coarse and fine aggregates from natural sources, with least void ratio was obtained using aggregate packing density (APD) method. SCC mixes with CRCA (SCC-CRCA) content at 0, 20, 45, and 100 % (of the total coarse aggregate content), by weight, were prepared. Flow, mechanical and durability properties of the SCC mixes were investigated. The flow properties at 90 minutes were also tested to take into account the transit time of concrete to site. The test results indicated that the properties of SCC-natural coarse aggregate (NCA)-CRCA mixes were not significantly different vis-a-vis the SCC-NCA mix properties when NCA was replaced by CRCA up to 45 %, suggesting that higher quantities of un-processed CRCA can be used in cement concrete as against that recommended in IS specifications (i.e. 20 %) for normal (non-SCC) concrete.
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Utilization of recycled aggregates (RA) extracted from construction and demolition waste (CDW), for production of cement concrete, is a viable way to effectively dispose this waste and promote sustainability. This paper presents the experimental test results on the flow, mechanical and durability properties of a self compacting concrete (SCC) containing unprocessed coarse recycled concrete aggregate (CRCA) extracted from CDW. A SCC with a compressive strength of 40 MPa was prepared for the purpose. An aggregate mixture, containing CRCA and coarse and fine aggregates from natural sources, with least void ratio was obtained using aggregate packing density (APD) method. SCC mixes with CRCA (SCC-CRCA) content at 0, 20, 45, and 100 % (of the total coarse aggregate content), by weight, were prepared. Flow, mechanical and durability properties of the SCC mixes were investigated. The flow properties at 90 minutes were also tested to take into account the transit time of concrete to site. The test results indicated that the properties of SCC-natural coarse aggregate (NCA)-CRCA mixes were not significantly different vis-a-vis the SCC-NCA mix properties when NCA was replaced by CRCA up to 45 %, suggesting that higher quantities of un-processed CRCA can be used in cement concrete as against that recommended in IS specifications (i.e. 20 %) for normal (non-SCC) concrete.

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