Avaliação da frequência de aplicação do concreto autoadensável no Brasil

Abstract

The self-compacting concrete is a product developed by Japanese in 1988 and its principal characteristic is the fluidity, with high capacity to occupy the spaces without using vibrator. Is a technology that shows many advantages to the concreting, being verifiably more productive than conventional concrete regarding workability, handmade reduction and velocity of execution, for example. Therefore, it has not been used by most vertical constructions and factories of precast concrete. The present dissertation intends to explain the reasons that fundamental technology has not being used by many constructions in Brazil. This essay was done by interviewing CEOs of big construction companies and precast concrete factories around the country. For this, was developed a questionary with 26 constructors’ representants and 30 precast concrete factories accepted to answer it. Those, representants of south, southeast, midwest and north east of Brazil. The questionary looks to understand if the business uses the self-compacting concrete and the reason to choose or not this technology. In this regard, was collected results of a questionary and identify a pattern: the ones that choose self-compacting concrete made this concerning about the cost, reducing the hand made during the process of concreting and, who does not choose the technology, also points the cost as a principal factor. The results were compared with a case study presented, wherein a work in Curitiba, a slab of the structure with self-compacting concrete was made without changing shapes, manpower, and quality control, to equalize with the numbers of the other slabs developed in conventional concrete. The result was a cost variation of approximately 7%, same hours worked, and a 14% reduction in the staff involved during concreting.