Abstract
A suite of undrained cyclic triaxial tests was performed to clarify the effects of calcium carbonate precipitation on liquefaction resistance of sand. For the tests Toyoura sand was utilized with relative density of ca.50%. Two kinds of soil samples were prepared by mixing 1-3 wt.% precipitated calcium carbonate into Toyoura sand, and the difference of liquefaction resistances evolved under the two different initial conditions was examined. Triaxial tests results and the corresponding examinations elucidate that 1) liquefaction resistances of calcium carbonated precipitated sand increase with increase of the amount of the mineral precipitated (at maximum threefold), 2) the augmentation may be attributed mainly to improvement of deformation characteristics due to intergranular cohesion evolved by the mineral precipitation, and 3) the liquefaction resistance can be evaluated via a simple relation between normalized shear modulus and liquefaction resistance of bare sand.
