Avaliação do módulo de elasticidade em concretos com 18 anos de idade.

Abstract

Concrete is the most widely used building material in the world due mainly to its great versatility, combined with good physical properties, with such use, the improvement of these properties is the subject of several studies. The modulus of elasticity is a property that has been neglected for a long time, but problems with slow deformations and the possibility of larger spans due to improved compressive strength of concrete, more attention has been directed to this property. To better predict the concrete modulus of elasticity in the projects it is necessary to know the behavior of this property in the different types of concrete. In this work the influence of mineralogical type of coarse aggregate, water / cement ratio, slump and age on the modulus of elasticity is studied. Concrete made with basalt, limestone and rolled pebble was analyzed; with water / cement ratio of 0.35, 0.50 and 0.70; slump of 20 mm, 110 mm and 200 mm; analyzed at 7 days, 28 days, 91 days, 413 days and the last at 18 years of age. The concretes made with basalt obtained the best results of modulus, followed by limestone and pebble, being the most significant variable. Concrete with lower water / cement ratio had better results. The slump was not very significant, with little variation between the mixes. The evolution of the modulus was observed until 413 days, but at 18 years the results were lower than expected, probably due to degradation due to improper storage.