Concreto auto adensável produzido com resíduo de polimento do porcelanato – comportamento em relação à corrosão de armaduras

Abstract

The search of sustainability in the construction sector and environmental preservation has fostered conducting research for the use of waste concrete and mortars. Within these industrial waste found the porcelain polishing residue (RPP) which is produced at the end of the manufacturing process of ceramics, due to the polishing step. However, for a product to be accepted in the market, it is necessary to know the physical and chemical behavior as well as their potential use and impact that perhaps may cause, when incorporated into other materials. This study examines the effects of the packing of aggregated and adding the RPP phenomenon in conventional concrete, self compacting front reinforcement corrosion caused by chloride ions action. For this conventional concretes were prepared (reference 0%, 10%, 20% addition RPP) and self compacting concrete (40% added RPP) in two dashes1:1,6:2,4:0,50 e 1:2,2:3,3:0,60.It was observed in the trials from Brazilian and thermogravimetry standards that the residue of the study area did not have pozzolanic properties. As a result of making strokes using aggregates packaging method, there was obtained concrete with lower levels of voids and absorption, as increased the amount RPP in the features with significant strength gains after 90 days with a variation in 19% to 35 % in trace 1 and 44% to 83% in dash 2.With respect to chloride corrosion tests, it was observed that the time elapsed until the depassivation of reinforcement for concrete incorporated with 10% added RPP increased by 327.00% trace 1 in the concrete and in 551 % dash concrete 2 when compared to the reference concrete. The RPP additions also cause a reduction in the amount of free and total chlorides of the cementitious matrix and decrease the diffusion coefficient of the concrete, can be explained by the decrease of the void ratio caused by aggregates packaging. These results show that the addition of RPP in concrete can be a sustainable alternative for disposal of this waste and also can prove to be a great ally in extending the shelf life of reinforced concrete structures subject to corrosion of armor.