Abstract
New rheological models are presented that can reproduce the load-induced deformations of two-phase composite materials from their compositions. The models are extensions of the earlier published ‘composite average’ concept. The mathematical forms of the rheological models are obtained first by considering the composite as a linearly viscoelastic, nonageing material. For ageing materials, such as concrete, the modulus of elasticity and viscosity of the hardened cement paste were estimated by suitable formulas from the cement type, water-cement ratio and age, and substituted into the nonageing solution (Equation 19). It is shown by two examples that Equation 19 can reproduce the creep of normal weight concrete quite well in terms of concrete composition, modulus of elasticity of aggregate and age of concrete, as well as age and duration of loading.
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