Avaliação de desempenho de argamassa modificada: com areia de pet

Abstract

His work aims to evaluate the performance of modified mortar with natural sand substitution by PET sand. The traces were made with 5%, 15% and 30% of plastic aggregate per natural aggregate. The replacement was done in volume and only in the particle size 1-2mm. The tests performed in the fresh state were: consistency index, density and air content incorporated. In the hardened state the absorption by capillarity, compression and tensile strength in the flexion was analyzed. After analysis of the assays in the fresh state it is concluded that: The density of the mortar decreases with the increase of the substitutions of the plastic aggregates by natural ones. This fact can be explained by the lower density of plastic aggregates in relation to natural sand. The air content increases with the addition of PET sand. This is because the mortars presented their very porous surfaces, which facilitated the entry of air. The consistency index also increased with the insertion of plastic aggregates, due to the addition of water that was necessary for the mortar to present a considerable consistency index. In the tests in the hardened state it can be observed that: In the water absorption test by capillarity, the samples with substitutions showed a reduction in relation to the reference sample, the same occurred with the capillary coefficient. The sample that presented the lowest absorption and capillary coefficient was the T3 with 15% of PET sand. In the compressive strength, samples with 5 and15% of PET sand showed superior resistance to the reference sample, but the same did not occur with the 30% sample. The test of tensile flexural strength presented a lower result than the compression test. However, the 5 and 15% samples also presented resistance values higher than the reference sample, and the 30% sample had lower results.