Abstract
In this study, multi-scale experiments and analytical micro-mechanics based modeling are conducted to evaluate Young’s modulus of alkali-activated slag (AAS) concrete. The evolution of volume fractions of phases is obtained using a thermodynamic model coupled with a kinetic model. Nano-indentation measurements indicate the existence of a soft and a hard matrix made of reaction products, independently of the mix tested. The homogenization model for Young’s modulus is validated against results on paste and concrete with more than 95 % accuracy. Sensitivity analysis reveals Young’s modulus of aggregates and of the soft matrix as the main influencing parameters.
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