Dynamic moduli of cement paste with different kinds of recycled concrete admixtures

This article deals with using recycled concrete powder as a partial replacement for cement. In particular, we focus on mechanical properties of cement pastes containing recycled concrete powder. We used three different recycled materials. The first recycled concrete powder was obtained from the PB2 and the SB8 railway sleepers, the second one was from the drainage gutter and the third one was from the monolithic construction of a pillar. All recycled materials were milled by LAVARIS Ltd. at high-speed milling process. Investigated mechanical properties were the dynamic modulus of elasticity and the dynamic shear modulus and were obtained by a non-destructive method: the resonance method. The dynamic modulus of elasticity and the dynamic shear modulus were examined and compared after 7, 14, 21 and 28 days of mixture curing. Results obtained from these materials were compared with the reference material. (paper)