Article Dans Une Revue Journal of Building Engineering Année : 2025

Failure mechanism in recycled sand mortars and recycled aggregate concretes: Experimental and multiscale approaches

Résumé

In the present work, the mechanisms controlling the uniaxial compressive strength of recycled sand mortars (RSM) and recycled aggregate concretes (RAC) are investigated considering experimental and multiscale modeling approaches. First of all, RSM and RAC (with different amounts of recycled sand and recycled aggregates respectively) are formulated with a fixed water to cement ratio of 0.42 and the key parameters (properties of old/new interfaces and mortars, micro-cracks) ruling the strength properties of RSM and RAC at different scales thoroughly analyzed and discussed. Among many other results, one notices a drop of around 30% of the compressive strength between 100% RSM (containing recycled sand only) and a reference mortar (without recycled sand) whereas in RAC, the impact of the total substitution of coarse natural aggregates by recycled ones is found to induce a decrease of around 16% (compared to a reference concrete). Moreover, a quite linear decrease of the compressive strength is detected from a certain replacement rate of natural sand or coarse aggregates by recycled ones (beyond 10% for RSM and 20% for RAC). As for the brittleness and the failure mechanism of RAC, they are found to be strongly related to the water to cement ratio, the content of the recycled aggregates and the compressive strength of the parent concrete. At the end, a multiscale model devoted to the prediction of the compressive strength of RSM and RAC is developed in the framework of quasi-brittle failure mechanism using the well-known Drucker–Prager criterion. The uniaxial compressive strength of RSM and RAC with different water to cement ratios and recycled sand/aggregates contents are therefore investigated and the theoretical results discussed. Fed with input data collected on the microstructure, the model is shown to predict with a good accuracy, the uniaxial compressive strength of recycled sand mortars and recycled aggregate concretes.

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Dates et versions

hal-04918252 , version 1 (29-01-2025)

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Citer

Ayodele Adessina, Amor Ben Fraj, Jean-François Barthélémy, Maissa Gharbi. Failure mechanism in recycled sand mortars and recycled aggregate concretes: Experimental and multiscale approaches. Journal of Building Engineering, 2025, 101, pp.111882. ⟨10.1016/j.jobe.2025.111882⟩. ⟨hal-04918252⟩

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