Análise do módulo de elasticidade estático e dinâmico do concreto de Cimento Portland através de ensaios de compressão simples e de frequência ressonante

Abstract

There are different methods of evaluating the Young's modulus. The most common methods involves the measurement the tensile/compressive strength and the strain of the material. The obtained value of the modulus of elasticity for homogeneous materials that behave according to Hooke's Law are obtained from tests with controlled strain rate in a rigid machine. For materials which have a high damping constant, it must be considered that the stress and deformation are dependent on time and frequency. Most compounds also behaves in the same way because of the presence of interfaces. For these materials, different experimental techniques can be used to determine thestiffness: resonant frequency, decreasing of free vibration, rotation of beams, and thermal methods. Even so, for cementitious compounds, the compression test and the use of empirical equations that relate the module with the specific mass and compressive strength are commonly used to determine de elastic modulus. This paper comparatively analyzed the modulus of elasticity of engineering cementitious composite determined through testing compressive strength and forced resonant frequency.