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Suivi des échanges d'eau dans un mortier de sable recyclé modèle à l'état frais par une approche rhéologique

Abstract : The increased interest in concrete recycling results from a willingness to reconcile the construction industry with sustainability. Recycled concrete aggregates (RCA) consist of a mix of natural aggregates and attached cement. The high porosity of RCA modifies the effective water content of a recycled concrete at the expense of its fresh and hardened performances. A testing method based on spread measurements is suggested to follow quantitatively water transfers between RCA sand and a fresh cement paste. This protocol is tested on cement paste sands (CPS) having 0.3, 0.5 and 0.7 water/cement ratios (W/C). Results show that the saturation degree of CPS embedded in a filler paste reaches a maximum no later than 6 minutes then remains quasiconstant. The saturation degree increases with the W/C of CPS ratios but remains less than 1. Moreover, similar water transfer kinetics are found whether initially dry CPS are immersed in a filler or a cement paste. The established protocol assumes a correlation between spread and effective water content of a mortar. In order to study this correlation, on the one hand, under the lubrication approximation, the yield stress of mortars is calculated from their spread radius. On the other hand, yield stress of mortars is calculated using a biphasic modelling of mortars viewed as non-colloidal suspensions in a yield stress fluid. Consistency between the two approaches is examined.
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Houda Maimouni. Suivi des échanges d'eau dans un mortier de sable recyclé modèle à l'état frais par une approche rhéologique. Matériaux. École centrale de Nantes, 2018. Français. ⟨tel-02888105v2⟩

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