**3. Results and Analisys**

*3.1. Final Dimensions and Overall Aspects of ASPU*

The 100 <sup>×</sup> <sup>100</sup> <sup>×</sup> 12 mm<sup>3</sup> artificial stone plates were produced within the standards. Later, they were cut to the dimensions specified for carrying out the tests. Figure 1 shows an ASPU plate.

*Sustainability* **2022**, *14*, x FOR PEER REVIEW 5 of 11

**Figure 1.** ASPU plate. **Figure 1.** ASPU plate. *3.2. Thermogravimetric Analysis* 

#### *3.2. Thermogravimetric Analysis* Figure 2 shows the TG and DTG curves for granite, polyurethane and ASPU.

*3.2. Thermogravimetric Analysis*  Figure 2 shows the TG and DTG curves for granite, polyurethane and ASPU.

ASPU **Figure 2.** Thermogravimetric Analysis for granite, PU and ASPU. **Figure 2.** Thermogravimetric Analysis for granite, PU and ASPU.

In Figure 2, it was possible to verify that the PU has a three the decomposition stages, which is justified by releasing several gaseous products. In Figure 2, it was possible to verify that the PU has a three the decomposition stages, which is justified by releasing several gaseous products.

**Figure 2.** Thermogravimetric Analysis for granite, PU and ASPU. The first stage was around 230 °C, with a 23% mass loss. As urethane bonds break and degrade around 200 °C, this stage is likely associated with this event. The second stage takes place around 330 °C, with a 20% weight loss, probably due to CO degradation. The third and last stage, around 380 °C with a 57% mass loss, was attributed to the compounds produced after the second stage degradation [26,27]. The first stage was around 230 ◦C, with a 23% mass loss. As urethane bonds break and degrade around 200 ◦C, this stage is likely associated with this event. The second stage takes place around 330 ◦C, with a 20% weight loss, probably due to CO degradation. The third and last stage, around 380 ◦C with a 57% mass loss, was attributed to the compounds produced after the second stage degradation [26,27].

In Figure 2, it was possible to verify that the PU has a three the decomposition stages, which is justified by releasing several gaseous products. The first stage was around 230 °C, with a 23% mass loss. As urethane bonds break and degrade around 200 °C, this stage is likely associated with this event. The second The granite remained stable, with negligible mass loss, approximately 0.78%. Furthermore, it was possible to confirm the composition of ASPU, considering that after the analysis, 86.58% of waste remained, as the resin was the only material that suffered a degradation process. The granite remained stable, with negligible mass loss, approximately 0.78%. Furthermore, it was possible to confirm the composition of ASPU, considering that after the analysis, 86.58% of waste remained, as the resin was the only material that suffered a degradation process.

Table 3 presents the density, water absorption and apparent porosity values of gran-

stage takes place around 330 °C, with a 20% weight loss, probably due to CO degradation. The third and last stage, around 380 °C with a 57% mass loss, was attributed to the com-

analysis, 86.58% of waste remained, as the resin was the only material that suffered a deg-

Table 3 presents the density, water absorption and apparent porosity values of gran-

radation process.

*3.3. Physical Properties* 

ite and ASPU.

ite and ASPU.

*3.3. Physical Properties* 

pounds produced after the second stage degradation [26,27].
