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Tableau 1
Proposition de raffinement de la classification AFTES basé sur l’essai micro-Deval modifié, la broyabilité à 30 s et l’abrasivité (d’après Le Cor, 2014).
Proposal for refinement of the AFTES classification based on modified micro-Deval test, grindability at 30 s and abrasiveness (from Le Cor, 2014).
| Classe d’altération | Classe de discontinuité (« fracturation ») | Micro-Deval modifié | Broyabilité à 30 s et abrasivité | Classification proposée | ||
|---|---|---|---|---|---|---|
| AM6 | Altérites | |||||
| AM5-AM4 | Très friable à friable | Cuh > 5,5 %/m2/min | IB30 > 40 % | D4 | ||
| IB30 ≤ 40 % | D3 | |||||
| Cuh ≤ 5,5 %/m2/min | Coefficient abrasivité < 150 g | D2 | ||||
| Coefficient abrasivité ≤ 150 g | D1 | |||||
| AM3-AM1 | Non friable | ID5 | Fragmenté | |||
| ID4-ID3 | Très fracturé à fracturé | |||||
| ID2-ID1 | Peu fracturé | |||||
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