Permeable concrete plates with wastes from the paper industry: Reduction of surface flow and possible applications

Sustainable pervious concretes were developed using waste from the paper industry so to lower cement use in public sidewalks and footways. Pervious concretes with 5 and 10% of industrial waste (WPI) in replace of Portland cement were produced. Flexural tensile strength and compressive strength measured were used to verify, through a numerical simulation, the flexural stress of a 0.7 x 0.8 x 0.1 m pervious concrete plate. Porosity, permeability coefficients of the plates, as well as their thermal conductivity were determined. As a result, compressive strength was reduced, flexural tensile strength was not influenced. Mixtures presented high degrees of permeability (over 3600 mm/h), and potentially reduce CO2 emissions in cement production, for the proposed use. The pervious concrete with 5% of WPI showed the lowest thermal conductivity (0.798 W/mk), inferior to the thermal conductivity of conventional impervious concrete (1.518 W/mk). The blended pervious concrete can be used where low compressive strength is admitted. (C) 2020 Elsevier Ltd. All rights reserved.