INFLUENCE OF PREPARATION CONDITIONS ON SOLIDIFIED-CRUSHED SOIL CHARACTERISTICS AND STRENGTH

Abstract

When the soil generated during road or river excavation work is too soft to be used as a material,
it can be improved by the use of solidifiers such as cement and lime. However, if an embankment has excessive
strength as a result of solidification, the embankment may be difficult to re-excavate. High-strength
embankments may fail if they are constructed on soft ground and are not able to follow the behavior of that
ground. For this reason, there is a demand for a material whose strength development can be controlled even
when a solidifier is added. As a solution to this issue, we investigated the use of crushed solidified soil. Crushed
solidified soil is produced by adding a solidifier to soil and then crushing the soil in the middle of the
solidification process. It is considered that the type and amount of solidifier and the timing for crushing have
considerable influence on the physical properties and strength of the product. Therefore, we investigated the
physical properties and strength of the crushed solidified soil and constructed two types of full-scale
embankments on soft ground. We compared the deformation characteristics of these two embankments. We
found that the crushed solidified soil had lower strength than the solidified soil and that the physical properties
and strength of the material depended on the time elapsed before crushing of the solidified soil. Furthermore,
it was found that the embankment by solidified crushed soil follows the deformation of soft ground