*3.6. Abrasive Wear*

Table 4 presents the results for ASPU and granite abrasive wear tests.

**Table 4.** Abrasive wear test results.


According to a study carried out by Chiodi Filho and Rodriguez [30] that classified materials to be applied as floors according to the volume of traffic and the wear thickness reduction: high traffic floors must be less than 1.5 mm, medium traffic floors must be less than 3mm and low traffic floors must be less than 6mm.

Therefore, according to this study, granite can be used for high-traffic flooring since it presented a 0.53 mm thickness reduction after a 500 m run and 1.13 mm after 1000 m. However, ASPU can be used for medium traffic flooring considering a 0.97 mm and 1.75 mm wear after a 500 and 1000 m run, respectively.

Abrasive wear tests evaluate the material pullout when it undergoes wear friction. The inferior performance of ASPU can be explained by the greater ease of removal of granite particles from the polyurethane matrix [34].

However, according to the NBR 15844 standard [31], which classifies granites by to their wear properties, to guarante the granite's quality, the thickness reduction must not exceed 1.0 mm after 1000 m run. Thereby, considering this specific standart, the both granite and ASPU presented wear higher than recommended, limiting its application as a pavement.
