Análise da viabilidade técnica e econômica da substituição parcial do cimento Portland por filler calcário na produção de peças de concreto destinadas a pavimentação

Abstract

Concrete using Portland cement has as its main characteristic the versatility of its use, ranging from a material as fluid as self-compacting concrete to even dry concrete. "Zero slump" concrete is used in the production of various cement-based products such as curbs, drainage pipes for urban areas, CBUQ pavement sub-bases, and most commonly, blocks for interlocking pavements. These blocks, popularly referred to as "pavers," when properly proportioned and adequately vibro-compacted, exhibit high durability. Furthermore, depending on the equipment used, they can achieve high productivity. Thus, the hypothesis was raised to replace, in varying proportions, part of the Portland cement with limestone filler to improve the technical and economic performance of the mix, as the binder is the most expensive component in concrete. As a methodology, the materials were characterized, followed by tests for compressive strength, water absorption, and dimensional evaluation according to NBR 9781 (ABNT, 2013). The results show that the use of limestone filler can contribute to technical and economic improvement with the correct proportions. The mix using Portland cement from the Votoran brand did not demonstrate a statistically significant increase in compressive strength, allowing for the replacement of up to 15% with limestone filler, with benefits limited to economic aspects. On the other hand, the mix using the Supremo brand binder showed 5% replacement as the best alternative.