Pervious concrete made with electric furnace slag (FEA): mechanical and hydraulic properties
AbstractThe present study aimed to use FEA slag to replace the conventional coarse aggregate in the pervious concrete (PC) production, reaching the minimum parameters required by NBR16416/2015 and ACI 522R-10. This substitution would minimize the use of natural aggregates, besides taking advantage of a residue that has no specific destination. In order to reach the objective, three FEAs with different particle sizes were chosen: 6-10 mm (A), 10-20 mm (B) and finally a mixture of the two previous ones (C) in the 30-70 proportion, respectively. In order to evaluate its mechanical behavior, tests of compressive strength and flexural tensile tests were carried out, while the hydraulic behavior was evaluated by porosity and constant head permeability tests. The compressive strength varied from 19 to 31MPa and flexural tensile strength, from 3 to 4MPa. In hydraulic terms, the porosity varied from 15 to 20% and the permeability coefficient was 10-12mm/s. There was also a direct influence of particle of size less than 4.8 mm (small aggregate) on the compressive strength and permeability of PCs. It was possible to establish a positive correlation between the mechanical and hydraulics properties, namely, between compressive strength, the permeability and the percentage of grains inferior to 4.8mm (% sand). Therefore, it can be concluded that the total replacement of conventional aggregates with FEA in PC manufacturing comply with the minimum parameters of NBR 16416/2015.