TY - JOUR
T1 - Effects of curing on the hydro-mechanical behaviour of cement-bentonite mixtures for cut-off walls
AU - Flessati, Luca
AU - Vecchia, Gabriele Della
AU - Musso, Guido
PY - 2023
Y1 - 2023
N2 - Cement-bentonite cut-off walls are commonly employed in geoenvironmental applications to limit ground water flow and pollutant transport. The wide diffusion of this artificial material in the current practice is not only due to its low permeability, but also to its simplicity of use. In this paper, experimental evidences about the role of curing on the hydro-mechanical behaviour of cement-bentonite mixtures are presented. Different curing times and curing conditions (representative for either water saturated or hydrocarbon polluted soils) have been considered, and their effects on both hydraulic conductivity and mechanical response in oedometer and triaxial conditions have been assessed. A unified hydro-mechanical framework, accounting for the changes of material fabric occurring with curing time and environment, is formulated. The hydraulic conductivity is very well predicted by a Kozeny-Carman like equation, whereas the mechanical behaviour is finely reproduced via an enhanced elastic–plastic constitutive model.
AB - Cement-bentonite cut-off walls are commonly employed in geoenvironmental applications to limit ground water flow and pollutant transport. The wide diffusion of this artificial material in the current practice is not only due to its low permeability, but also to its simplicity of use. In this paper, experimental evidences about the role of curing on the hydro-mechanical behaviour of cement-bentonite mixtures are presented. Different curing times and curing conditions (representative for either water saturated or hydrocarbon polluted soils) have been considered, and their effects on both hydraulic conductivity and mechanical response in oedometer and triaxial conditions have been assessed. A unified hydro-mechanical framework, accounting for the changes of material fabric occurring with curing time and environment, is formulated. The hydraulic conductivity is very well predicted by a Kozeny-Carman like equation, whereas the mechanical behaviour is finely reproduced via an enhanced elastic–plastic constitutive model.
KW - Cement-bentonite mixtures
KW - Constitutive modelling
KW - Curing
KW - Hydraulic conductivity
KW - Hydro-mechanical properties
UR - http://www.scopus.com/inward/record.url?scp=85152635028&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2023.131392
DO - 10.1016/j.conbuildmat.2023.131392
M3 - Article
AN - SCOPUS:85152635028
SN - 0950-0618
VL - 383
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 131392
ER -