Abstract
Construction materials, among which concrete is by far the most used, have followed a trend of continuously increasing demand in real estate. A relatively small number of research works have been published on the long-term material properties of concrete in comparison to studies reporting their findings at standard curing ages of 28 days. This is due, in part, to the length of time one must wait until the intended age of concrete is reached. The present paper contributes to filling this gap of information in terms of the strength and dynamic elastic properties of concrete. The dynamic modulus of elasticity may be used to assess the static modulus of elasticity (Young’s modulus), a key property used during the design stage of a structure, in a non-destructive manner. This paper presents the results obtained from laboratory tests on the long-term (6 years) characterization of concrete from the point of view of dynamic shear and longitudinal moduli of elasticity, dynamic Poisson’s ratio, static modulus of elasticity, compressive and tensile splitting strengths, and their change depending on the concrete strength class.
Highlights
The increasing demand in real estate recorded during the past three decades has resulted in a continuous rise in the consumption of raw materials to meet the needs of modern life
The dynamic modulus of elasticity may be used to assess the material damping ratio and, by means of empirical conversion equations, to determine in a non-destructive manner the static modulus of elasticity (Young’s modulus), a key property used during the design stage of a structure
This paper presents the results obtained from laboratory tests on the long-term (6 years) characterization of concrete from the point of view of the dynamic shear and longitudinal moduli of elasticity, dynamic Poisson’s ratio, static modulus of elasticity, and compressive and tensile splitting strengths
Summary
The increasing demand in real estate recorded during the past three decades has resulted in a continuous rise in the consumption of raw materials to meet the needs of modern life. With every new development, standardized tests are employed to assess whether or not the resulting concrete is suitable for structural applications This means that the strength and elastic properties of concrete are determined at a fairly early stage, compared to the lifespan of the building it becomes a part of. A relatively small number of research works have been published on the long-term material properties of concrete in comparison to studies reporting their findings at standard curing ages of 28 days. Recent studies have revealed the effect of metakaolin and silica fume on the long-term strength and durability properties of concrete [5] Both supplementary cementitious materials have an influence on either the compressive strength or internal structure of concrete, but their synergistic long-term effect does not produce significantly improved mechanical properties. The main parameters of the research were the concrete age, which was either 28 days [10] or 6 years, and the concrete strength class (three different strength classes were considered)
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