Most of the historical buildings around the world have been suffering from wear of their external coatings, which require constant repair to maintain the aesthetic and cultural characteristics of these buildings. This exploratory research evaluated the rendering plasters of four historical buildings located in Campos dos Goytacazes, in the interior of the state of Rio de Janeiro, Brazil, by consulting historical data, architecture analysis and characterization of the external coatings, which were identified as gypsum plasters. Thus, a methodology was proposed to evaluate the feasibility of using a new gypsum plaster, with the use of rock waste, to repair these valuable coatings. 1:3:0.8 plasters (gypsum:sand:water) were used, using waste to replace sand and gypsum, performing the analysis of the main parameters in the fresh (consistency, incorporated air content, mass density, water retention and squeeze-flow) and hardened state (density, mechanical strength, water absorption and adhesion). The results proved the feasibility of using the waste in renderings to repair the studied buildings, namely when 25% of sand was replaced with waste. With this composition, flexural strength increased from 0.91 MPa to 1.33 MPa and compressive strength from 1.89 MPa to 3.18 MPa.

世界上大多数历史建筑都遭受了外墙涂料的磨损，这需要不断修复以保持这些建筑的美学和文化特征。这项探索性研究通过参考历史数据，建筑分析和外墙涂料的特性，评估了位于巴西里约热内卢州内的Campos dos Goytacazes的四座历史建筑的抹灰石膏，这些石膏被鉴定为石膏灰泥。因此，提出了一种方法来评估使用新型石膏灰泥和岩石废料修复这些有价值的涂料的可行性。使用1：3：0.8的灰泥（石膏：砂土：水），用废物代替沙子和石膏，对新鲜食品的主要参数（稠度，空气含量，质量密度，保水性和挤压流动性以及硬化状态（密度，机械强度，吸水率和附着力）。结果证明了将废料用于建筑效果图修复所研究建筑物的可行性，即用废料代替25％的沙子。通过该组成，弯曲强度从0.91MPa增加到1.33MPa，抗压强度从1.89MPa增加到3.18MPa。