Análise e viabilidade da aplicação do Betão Auto-Compactável (BAC) em Moçambique

Abstract

Self-compacting concrete (SCC) represents one of the most significant technological innovations in the construction sector, standing out for its high workability, ability to flow and fill complex forms without the need for mechanical vibration. This characteristic enables substantial improvements in execution quality, reduction of compaction defects, lower labor requirements, and increased structural durability. This study aimed to analyze the feasibility of applying SCC in the Mozambican context, addressing it is fundamental properties, advantages, applications, and typical proportions of constituents. To achieve this goal, two surveys were conducted: the first targeted engineers, technicians, and other construction professionals to assess their level of knowledge and practical experience with SCC; the second was aimed at concrete batching plants to identify the frequency of requests, production availability, and main challenges related to the manufacturing of this material. Additionally, laboratory tests were carried out to evaluate the possibility of producing an SCC mixture using locally available materials. The adopted methodology was based on the mix design method proposed by Tutikian and Dal Molin, starting with the characterization of aggregates (particle size distribution, specific gravity, water absorption, bulk density, flakiness and elongation index). Subsequently, concrete mixes were prepared and tested to verify their self-compacting properties through slump-flow, T500 time, and J-Ring tests. Finally, test specimens were molded to determine compressive strength at 3, 7, and 28 days, in order to assess the mechanical performance of the produced SCC.