UTILIZAÇÃO DE ÁGUA DE LAVAGEM DE BETONEIRA COMO PREPARO DE BASE EM REVESTIMENTO DE ARGAMASSA

Abstract

Due to the high polluting potential of water from washing concrete mixer trucks, new applications have been sought for this civil construction waste, avoiding its improper disposal in the public wastewater collection network and in nature. In this circumstance, experiments were carried out evaluating the applicability of the mixer washing water as an alternative to conventional roughcast (cement and sand). The central evaluation of the coatings occurred as to the adhesion resistance to traction, due to the concern of the sector regarding the pathologies in mortar coatings, mainly cases of detachment in the coating / substrate system. For the feasibility of the research, specimens of coatings were made, with substrate adopted from conventional ceramic blocks, prepared with the following types of roughcast: conventional, mixer washing water with and without lime. In the analysis of the results it was observed that the base preparation using the concrete mixer washing water obtained results equivalent to the base preparation considered as conventional roughcast and within the normative parameters. Furthermore, it was found that the preparations containing lime obtained inferior results.