Estudo do empacotamento dos agregados na produção de concretos convencionais

Abstract

The construction industry, both in Brazil and in other countries, is a sector that significantly impacts and drives economic and business development. In recent decades, driven by the growing demands of the market, concrete technology, especially dosage methods that can be universally applied, are clearly embedded in these demands. In this context, various researchers have been dedicated to reducing cement consumption, aiming at the global urgency of reducing pollutant emissions into the atmosphere. Thus, one of the studied alternatives is particle packing, which consists of composing the particle size distribution of aggregates in order to reduce the voids between them, consequently reducing the demand for cement to achieve the same compressive strength in concrete. Within this context, this study evaluated the experimental packing method, based on NBR 16972 (ABNT, 2021). Based on the results obtained for the void index of mixtures between different aggregates, it was possible to specify the proportion of aggregate sets with different particle size distributions to compose a packed concrete mix. Thus, the results of compression tests indicated that the packed mix showed a 34% higher strength compared to conventional concretes, however, the workability of the packed concrete mixture was reduced.