Revestimento em paredes de alvenaria

Abstract

Nowadays companies that operate in the field of civil construction have been seeking, at all times, new techniques and materials that provide cost reduction and process optimization, with the objective of making their final product, the square meter built, more competitive and attractive with their competitors and the real estate market. The present work came to analyze the replacement of the traditional method of coating, which consists of the application of three layers of cementitious mortar, chapisco, plaster and plaster, by a single layer of smooth plaster, which has the option of being applied by projection, gaining more productivity in the execution of the technique, making its use increasingly popular in civil construction. In this sense, the study was divided into two distinct stages, where at first a bibliographic research was carried out about the methods and their inputs necessary for application, characterizing the entire executive process, from the preparation of the base to receive the layers, preparation of the materials until their final application. In a second moment, an on-site visit was carried out, both at the construction site and at the company's office, where information was collected from the contractor who performs the application of the smooth plaster and the accounting and construction department. A comparison was made between the two methods and some parameters that we used in the evaluation of the best technique were evaluated, such as: workability, execution time, adherence and financial value for the application of the technique. Based on the results found in the research, the workability presented in both techniques was satisfactory and good, for the professional who performs the application, the material of the two techniques presented a comfortable consistency of handling, especially in cementitious mortar, with the use of plasticizer additive to replace lime. The adhesion capacity to the substrate of both materials was satisfactory, they came to meet the parameters of the Brazilian standard ABNT NBR 13207:2017 for gypsum and Brazilian standard ABNT NBR 13749:2013 for cementitious mortar. The designed smooth plaster showed to have its most productive execution, with a time for its application, on average, five times shorter than the cementitious mortar, reflecting directly on the planning of the enterprise and impacting on costs, completion of stages, demobilization of labor and proving that the technology used in its application, the projection machine, was relevant in reducing time and contributes to the fulfillment of the schedule of companies that choose to use the technique.