PROPIEDADES FÍSICO-MECÁNICAS DE CONCRETOS AUTOCOMPACTANTES PRODUCIDOS CON POLVO DE RESIDUO DE CONCRETO

Abstract

The high demand of Ordinary Portland Cement (CPO) due to the increase in new civil works, in addition to the generation of demolition and construction waste (RCD), cause a negative environmental impact, so a solution to this problem is the recycling of these materials to produce new concrete. The partial replacement of Portland cement by concrete waste powder (CWP) from the concrete recycling process has been highlighted as a sustainable approach. This paper present the chemical and pozzolanic characterization of CWP through X-ray fluorescence (FRX) and Frattini and resistance activity index test respectively. Also, it was evaluated the feasibility of producing self-prepared concretes (SCC) prepared with CWP. The performance of SCC prepared with various replacement ratios of CWP to CPO (i.e., 0 %, 10 %, 20 %, and 30 %) from RCD, has been evaluated experimentally. The workability properties were performed regarding the slump flow test, V-funnel, and L-box. The hardened properties of SCCs including compressive strength, splitting tensile strength and flexural strength, porosity and Capillary suction were studied. The experimental results of this work are showed that the CWP can be used successfully as a filler in self-compacting concrete, although decreasing workability and mechanical resistance.