Abstract
The paper focuses on the influence of concrete type and strength on the relationship between initial and stabilized secant moduli of elasticity. These moduli, as well as compressive strength and density, were tested for four structural concrete series: two lightweight aggregate and two normal-weight ones. The carried out research showed that in each case the value of initial secant modulus of elasticity was lower than the stabilised one and the ratio of these two moduli is strongly dependent on concrete material homogeneity.
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