SEDL / STP / STP1518-EB / STP48921S

Long-Term Properties of Airfoam-Treated Lightweight Soil Made from Dredged Clay

Watabe, Yoichi
Port and Airport Research Institute, Yokosuka,

Tanaka, Masanori
Port and Airport Research Institute, Yokosuka,

Saegusa, Hiroyuki
Toa Corporation, Yokohama,

Shinsha, Hiroshi
Penta-Ocean Construction Co., Ltd., Tokyo,

Tsuchida, Takashi
Hiroshima University, Higashi Hiroshima,

Pages: 17    Published: Jan 2010

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Abstract

Airfoam-treated soil is lightweight and provides for the early age development of shear strength and effective utilization of dredged soils. This paper summarizes a 10-year follow-up study of the lightweight soils that were placed as backfill at the seawall in Kobe Port Island and Tokyo International Airport. These two sites are the early case examples of construction undertaken in 1996 including the recovery project after the Kobe earthquake disaster and the offshore expansion project of the Tokyo International Airport. Sampling and laboratory testing were carried out in order to investigate the physical and mechanical properties to compare the initial material condition. The depth profiles of the soil parameters such as bulk density, water content, pH, Ca content, shear strength, and needle penetration resistance were examined. Consequently, it was confirmed that the physical and mechanical properties of the airfoam-treated lightweight soil satisfied their required performances, indicating that the lightweight soil has sufficient durability for use as geomaterial for construction in coastal areas.