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An Experimental Study of Self-Compacting Concrete Made with Filler from Construction and Demolition Waste

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Document pages: 21 pages

Abstract: This study evaluated the influence of the Portland cement replacement by0, 5 , 10 , 15 and 20 of Construction and Demolition Waste (CDW) filler contents in the production of self-compacting concrete(SCC). The SCC mixtures were evaluated on fresh state by slump flow,J-ring, resistance of segregation, specificgravity, and on hardened state by compressive and splitting tensile strength,specific gravity, air voids and absorption rate. The results indicated that allSCC produced with CDW filler met the limits established at any level ofsubstitution without changes of the w c ratio or superplasticizer content. Itwas possible to verify that the presence of CDW filler, in substitution ofcement, by volume, improves the resistance to segregation and up to 5 of CDWfiller decreases the loss of fluidity with time as compared to reference. Itwas found that all SCC mixtures, at 28 days, had the average compressivestrength above 50 MPa, without showing significant loss with up to 20 of CDWfiller. For splitting tensile strength, SCC recycled mixtures reached up to92.5 of the SCC used as reference. Absorption rate and air voids index of SCCrecycled mixtures had a maximum increase of 1.60 Compared to the reference one.So, it is possible to conclude that the use of the CDW filler up to 20 insubstitution of cement, by volume, is feasible for SCC production.

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