Análise da influência de modelos de empacotamento de partículas na resistência à compressão axial de um concreto de pós reativos

Abstract

The constant search for optimization and improvement of construction methods makes the civil construction market explore new materials. Thus, the objective of this study was to analyze the influence of particle packing models on the axial compressive strength of a reactive powder concrete (RPC), a material with a lack of exploration, mainly in Brazil, whose outstanding characteristics are high resistance to axial compression, very low porosity and permeability, resulting from a high-density matrix, which gives RPC a longer useful life and lower maintenance cost when compared to conventional concrete, and may cover applicability greater in various types of construction. Particle packing is fundamental in the production and development of concrete with greater compactness, since it leads to the filling of voids between the different particle sizes, in order to achieve the main characteristics of RPC. This study has used the models of Alfred, Andreasen, De Larrard and Toufar to define the mix of concretes, evaluating the axial compression strength values for two ages – 97 and 112 days. It was identified that there was an evolution in the gain in resistance to axial compression from 97 days to 112 days in all packing models. Statistically, it was possible to state that for the Toufar model the compressive strengths are the same at all ages; for the De Larrard model, there is a statistical difference between the ages of 97 days and 112 days.