Estudo da adição de material carbonático ao compósito de óxido de magnésio em relação à sua resistência à compressão

Abstract

The construction industry in view of its variety of possibilities and special needs for each construction goes through a constant process of seeking innovation in materials and construction methods, either to increase profitability or for specific jobs. Magnesium cement was developed some time ago, and in the last 30 years 30 dams have been built in China using concrete with added magnesium oxide to the concretes in that country (Du Chongjiang, 2005). Thereafter, the benefit of adding this compound to concretes was observed, such as lower deformability, improved workability, and lower thermal conductivity. The beneficial properties obtained with this incorporation to the concretes, aroused the possibility of studying magnesium oxide (MgO) as a geopolymer in civil construction, since it was already used in the refractory industry and in dentistry. The relevance of the topic is also in the development and applications for this geopolymer in civil construction and, in the case of this study, to analyze the addition of limestone in powder form to the composite formed by MgO and Magnesium Sulfate Heptahydrate, aiming at improving the mechanical properties and cheapening the final product.