Reutilização de borracha de pneus usados como adição em pasta de cimento

TL;DRAbstract

The surface modification of powdered tire-rubber to increase the adhesion to cement paste was studied. Industrially recovered tire particles were obtained in the market. The particles were surface-treated with H 2 SO 4 and NaOH aqueous solutions for 15min. Cement paste test specimens were cast (water/cement ratio = 0,33) with the addition of 5 or 10% rubber (35 mesh maximum size). Water sorption, density, resistance to acid attack and flexural strength measurements were performed; the test specimens with 10% NaOH-treated-rubber showed the best results. Scanning electron microscopy, water sorption, flexural strength, compressive strength, abrasion resistance, modulus of elasticity and fracture energy measurements were performed using test specimens (water/cement ratio = 0,36) containing 10% of as-received or 10% of NaOH(saturated solution)-treated-rubber. The results of flexural and compressive strength, fracture energy and resistance to acid attack show that the addition of rubber part

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