In this study, field scale cement-stabilization for the surface of the dredged clay at the Busan's new harbor site was performed in order to understand behaviors of cement-stabilized soil which was improved by cement material. The types and the amounts of the material were determined by mixing design test. After 28days from the end of cementstabilization, field loading test was performed, and behaviors of cementstabilized layer were observed by measuring settlement and an earth pressure. As the result of analyzing the relationship between adding amount of cement and uniaxial compressive strength with considering uniaxial compressive strength and real amended volume of cemented layer from quality estimations after field test.

INTRODUCTION

Recently, reclaiming of seashore land to procure land to build new large-scale harbors, airports, new cities, industrial complexes and agricultural sites, and construction of industrial complexes and roads on the seashore area have been frequently performed. Unlike in the past, due to environmental and economical concerns, it is now more difficult to procure good quality surcharge material, hence dredged soil is actively used. However, even after 10 years, only the surface of a ground created using dredged soil is strengthened by natural drying, and it is impossible for the equipments to improve the ground to enter. Therefore, it is necessary to assure that such equipments can enter the land by strengthening the surface soil by using methods such as cementstabilization for surface soil(C. G. Han, 2003). Cement used for cement-stabilization for surface soil must be strong enough to support construction equipments, but at the same time, the less cement is used, the better it is environmentally and economically. Hence, cements that can provide high strength with the least amount, and that are environmentally less harmful are being developed. To investigate field applicability for the mixture ratio obtained from the results of laboratory experiment, this study executed a simple test construction for a stabilization of surface layer in some area of spoil treatment plant.

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