Influence of pore water chemistry on hydaulic conductivity of kaolinite suspensions

Enza Vitale (1) , Manuela Cecconi (2) , Paolo Croce (1) , Dimitri Deneele (3) , Vincenzo Pane (2) , Giacomo Russo (1) , Alessia Vecchietti (2)

1 University of Cassino and Southern Lazio [Cassino]
2 UNIPG - Università degli Studi di Perugia = University of Perugia
3 IFSTTAR/GERS/EE - Eau et Environnement

The role of pore water chemistry on particle aggregation and soil formation during sedimentation process has been investigated for a kaolinite clay suspensions. The modification of surfaces charge properties of clay minerals induced by different pore water chemistry rules the particles arrangement. As a consequence, at volume scale the sedimentation behaviour and in turn the physical, mechanical and hydraulic behaviour of the formed soil skeleton are changed. Sedimentation tests on several suspensions showed the influence of different aggregation on settling and self-weight consolidation stages. Hydraulic conductivity of kaolin suspensions has been estimated from the settling velocity recorded in sedimentation tests. Test results showed the relevant dependency of the hydraulic conductivity of the clay suspensions on the particle arrangement induced by the pore water chemistry.

Mots clés: SEDIMENTATION; PORE WATER CHEMISTRY; CLAY PARTICLE ASSOCIATION; PERMEABILITY

Mots clés: PERMEABILITE; ARGILE

Domaines: Sciences de l'ingénieur [physics]

Enza Vitale, Manuela Cecconi, Paolo Croce, Dimitri Deneele, Vincenzo Pane, et al.. Influence of pore water chemistry on hydaulic conductivity of kaolinite suspensions. Procedia Engineering, 2016, 158, pp.81-86. ⟨10.1016/j.proeng.2016.08.409⟩. ⟨hal-01775047⟩