Concrete waste after further processing can be used in the form of a micronized powder in which the non-hydrated portions are reactivated. For this purpose, nanoindentation and scanning electron microscopy with X-ray spectroscopy (SEM-EDS) are combined to determine properties of the concrete sample. The approximate composition of old concrete is calculated from SEM BSE image analysis. The nanoindentation technique over two main material levels enabled evaluation of the indentation modulus of these phases due to the spectral deconvolution of measured data. All these techniques serve for determining the activity of old concrete and characterization shape and textures of activation micronized old concrete powder.Keywords: Old concrete, nanoindentation, SEM analysis, micronized powder
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