Estudo para incorporação de resíduos de construção e demolição em elemento permeável intertravado

Abstract

This is a study on the incorporation of construction and demolition waste for the production of permeable concrete pieces for paving urban areas with pedestrian and light vehicle traffic, aiming to solve two of the biggest problems of modern society: (a) the inappropriate destination solid waste and (b) waterproofing the soil in urban areas. For this, permeable concrete pieces were produced with partial replacement of the natural coarse aggregate by recycled aggregate in the percentages of 20, 40, 60 and 80%. Throughout the study, the dosages and granulometry of the aggregates were modified to find the perfect trace that met the final objective. In the laboratory, the tests were divided into analyzing the mechanical and hydraulic viability of the parts produced with recycled aggregate comparing with the part produced with natural aggregate. Compressive strength tests were performed to analyze the mechanical strength using a hydraulic press. To analyze the hydraulic permeability a variable load permemeter was used. Preliminary results of the research indicated that the use of single-sized aggregates could provide concrete with high porosity, but not of adequate strength, thus fine aggregate was added to the mix, with this change there was a significant improvement in mechanical strength and permeability was appropriate. It was possible to verify that only the line with 20% replacement met the normative reference to the minimum mechanical resistance, while all lines met the minimum requirement stipulated in the current regulatory standard for the permeability coefficient. Thus, replacing up to 20% of the natural coarse aggregate with recycled aggregate is feasible because it also meets the minimum mechanical strength parameters of 20 MPa. The result demonstrates the possibility of reusing these residues, which also results in advantages of an economic and environmental nature.