Confecção de concreto para torres eólicas pré-moldadas protendidas

Abstract

Renewable energies are growing more and more every day, wind towers are already a reality in the world we live in, in fact, it has been around for a while. It started with windmills in Holland and today we are already building metal and reinforced concrete for the production of electricity. The prestressing is already a reality, because with it we can overcome increasingly large gaps and, therefore, with this overcoming, we would be able to quadruple or even quintuple the energy produced just on account of achieving greater and greater heights. The reason for the height increase would be the ability to place larger and larger blades, making the wind turbines rotate their internal coil more quickly. There may already be a greater investment in this area. For the study of the work, I used the methods adopted by the Associação Brasileira de Normas Técnicas (ABNT) to make two lines, both on-shore, one for the environmental aggressiveness class (CAA) I and the other for CAA III, which is defined from ABNT NBR 6118: 2014. For the tests of the elaborated traces, I used NBR 5738: 2015 and NBR 5739: 2018 for the elaboration of specimens and the compressive strength test, showing their feasibility of use and cost. As a conclusion of this research, we found that the traces showed excellent results: for CAA I it reached 34.97Mpa, while the standard requirement is 25Mpa, and for CAA II it reached 42.64Mpa, while the standard requires 35Mpa, according to ABNT NBR 6118: 2014. They also obtained an excellent performance in the percentage of absorption, which was 0.72% (CAA I) and 0.6 (CAA II), according to ABNT NBR 9778:2005.