Strength and Deformation Properties of Liquefied Stabilized Soil Prepared by Various Conditions

Abstract

In Japan, Liquefied Stabilized Soil (LSS) is widely used as one of the effective utilization of excavated soil. LSS is a cement-treated soil classified as a slurry pre-mixed soil, which is easy to occur brittle failure and the addition of fiber content might improve the brittle behavior. Recently, various investigations into the strength and deformation properties of LSS with fiber were conducted. However, there is no comprehensive investigation of LSS with fiber under various combination conditions performed. Therefore, this study conducted a series of Consolidated-Undrained triaxial compression tests by a constant axial strain rate, with small unloading and reloading during the monotonic loading to investigate the effect of various densities and curing times on the mechanical properties of LSS. Also, the comparison of LSS mixed with the pulverized newspaper in the amounts of 0 and 10 kg/cm 3 cured laboratory and in-situ is discussed. Based on the test results, the effect of slurry density on the strength of LSS was found to be greater than the effect of curing time. The pre-peak behavior of the q~εa curve became more non-linear under the effect of changing slurry density, in contrast to the effect of curing time. Moreover, the damage degree of LSS with shearing becomes small with curing time, while it seems to be rather independent of slurry density. With in-situ LSS, the influence of curing time on the initial Young's modulus, E0, is lower than the effect of slurry density.

Properties of High-Flowability Liquefied Stabilized Soil Made of Recycled Construction Sludge

“…The values for HFLSS made of RCS are 2.2 × 10 4 kN/m 3 and 17.7%. However, the unconfined compressive strength required for ordinary backfilling is 100-300 kN/m 2 or higher in most cases, indicating that HFLSS made of RCS meets the necessary quality [4][5][6][7][8][9]. On the other hand, both the coefficient of subgrade reaction and CBR values are low, raising concerns about deformation.…”

“…This material does not require compaction and is expected to exhibit a hardening effect when mixed with an appropriate amount of solidifier in a muddy soil that has moderate flowability. In principle, it consists of a base material such as construction-generated soil with a high water content or construction-generated sludge that has undergone intermediate treatment, and a solidifier to stabilize the soil to the prescribed mechanical properties [4][5][6][7][8][9]. The LSS is mainly used in narrow spaces where compaction by earthworks is difficult; it is employed to fill gaps by pouring, ensuring quality through its strength and high filling ability after solidification.…”