Estudo de argamassas de revestimento com incorporação de resíduo de pavimento asfáltico

Abstract

The intense demand for urban infrastructure makes the civil construction industry one of the greatest natural resources consumers of the planet, besides being responsible for a great production of demolition and construction residues (DCR). As an example, one of the most common construction residues are originated from the excavation of street and avenues pavements. In addition, a big amount of those residues do not have a sustainable management, being frequently dumped without a correct analysis about its potential of being used as a civil construction material. Therefore, the research pretends to analyze the feasibility of the DCR incorporation, replacing the sand in coating mortars, which are widely utilized and consume a big amount of raw materials. First of all, the ratio of 1:3 (cement : sand) was established, thus the CDR incorporation consisted of adding 20%, 40%, 60%, 80% and 100% of the residue in volumetric portions. And, all those values were compared with the reference mixture. Aiming to a complete analysis of the DCR application in mortars, the properties of the fresh stage such as consistency index, water retentivity, specific gravity and air entrained content were measured. Moreover, the measurement of the hardened stage properties was made, determining the specific gravity, water absorption coefficient due to capillarity action, flexural strength, compressive strength, and absorption and voids. The results revealed that, up to 40% of RCD incorporation, the performances related to workability were satisfactory, hence it was possible to produce a softer mortar with greater mechanical properties when compared to the reference mixture. Thus, the RCD incorporation in coating mortars works satisfactory until 40% of replacing, propitiating a more sustainable and functional management to the residue.