The
reactivity of the recycled glass powder (GP) in a cementitious medium has been
studied over time by means of X-ray diffraction and thermal gravimetric
analysis. Two different mixtures based on cement/glass powder (0 or 20 wt% GP)
and lime/glass powder (70 wt% GP) were considered. Analysis revealed the coexistence
of both hydration and pozzolanic reaction during the hardening of the mortars.
At young age, the cement hydration would prevail over the pozzolanic one
resulting in a decrease of physico-chemical and
mechanical properties of the material due to the dilution effect. The
pozzolanic reaction that predominates from 91 days, would induce the formation
of supplementary C-S-H leading to improve the material properties.
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