Adições minerais e materiais a base de cimento Portland: uma revisão de literatura sobre a influência de adições nas propriedades mecânicas e de transporte

Abstract

Mineral admixtures are materials widely known and used in the Portland cement industry, either for their ability to improve the properties of concrete and mortars, or for their excellent alternative for environmental benefits, with a great number of reports in the technical literature about the study and development of new mineral additions. In this context, the present work aims to analyze the state of studies on mineral admixtures and their influences both on mechanical properties and on those related to durability through a critical review of the literature. Initially, four additions of interest to the concrete and mortar technology were selected. Then, keywords were applied in successive searches on search engines, especially for works produced in the last decade aiming the of the frontier of knowledge, and 162 works were consulted, of which 34 were selected to compose the review. Among the selected works with additions of rice husk ash, red ceramic residue powder, silica fume and carbon nanotubes, variations in the results were observed for the same type of addition due to the complexity of the influence of the parameters together. In the general picture, the additions proved to be beneficial for the analyzed concretes and mortars, as long as made at certain levels of addition or partial replacement, providing ecological benefits by reducing cement consumption and making use of materials that could be improperly disposed of in the environment.