*2.1. Materials*

White granite waste from the slab finishing step that would be discarded was supplied by the Brumagran company located in Cachoeiro de Itapemirim, Brazil. The waste was hammered and subjected to a jaw crusher in order to be sieved according to the technical standard ABNT NBR 7181 [19] and thus classified into three granulometric ranges: coarse (2 to 0.42 mm), medium (between 0.42 to 0.075 mm), and fine (grains with particle sizes less than 0.075 mm).

Based on the three granulometric ranges, ten mixtures with different percentages of coarse, medium and fine particles were considered. A ternary diagram according to the Simplex Centroid Model was used in order to determine the mixture with the highest dry bulk density and consequently the one with the greatest packing. Therefore, the mixture selected for the development of ASPU was the one containing 4/6 of a coarse particle, 1/6 of a medium particle and 1/6 of a fine particle.

The resin used was vegetable polyurethane (PU) from castor oil. This resin is formulated by a prepolymer (component A) and a polyol (component B) cold mixing and a polyol (component B). The resin was supplied by company IMPERVEG, Brazil.
