Rj. Finno et al., COEFFICIENT OF PERMEABILITY FROM AC ELECTROOSMOSIS EXPERIMENTS .2. RESULTS, Journal of geotechnical engineering, 122(5), 1996, pp. 355-364
Alternating current (AC) electroosmosis tests, which permit rapid dete
rmination of the coefficient of permeability of saturated cohesive soi
ls are described. The testing device was developed to minimize the adv
erse effects of prolonged application of direct current on observed re
sponses. The apparatus and procedures to conduct the AC experiments ar
e presented and results of 19 experiments are analyzed In these tests,
a weak AC is sinusoidally applied under nominally undrained boundary
conditions to saturated kaolinite specimens; excess pore pressure and
phase angle are measured at frequencies between 0.25 and 4 Hz. The res
ults of the experimental program and the procedures of backcalculating
the coefficient of permeability are presented. The coefficient of per
meability from falling head permeability and AC electrosmosis tests on
specimens of resedimented kaolinite are shown to agree within a facto
r of five. These data support the theoretical conclusions of the compa
nion paper and suggest that this type of test is feasible to rapidly e
valuate the coefficient of permeability of saturated cohesive soils in
the laboratory.