3.1.1. Granulometric Analysis

The soil used for making the bricks, according to its particle distribution, showed 57.1% sand, 24.3% clay and 18.6% silt fraction, which is classified as sandy clay soil according to the ABNT standard [44]. This soil is considered suitable for making bricks as recommended by [45], who state that soils with sandy characteristics are the most suitable for the confection of soil-cement bricks, and also by the ABCP [46]. Indeed, the results of the granulometric analysis of the soil indicated that 100% passed through the ABNT 4.8 mm sieve (n◦. 4) and 10% to 50% passed through the ABNT 0.075 mm sieve (n◦ 200), as observed in the granulometric curve presented in Figure 3.

**Figure 3.** Natural soil and PET waste granulometric analysis.

The particle size distribution of PET particles was 99.9% sandy, 85.5% coarse, 11.5% medium and 2.9% fine particles, as shown in Figure 3. Since PET did not present consistency limits nor hygroscopicity, it can be considered non-plastic and sandy, according to the ABNT standard [44].
