LONG-TERM PROPERTIES OF AIR-FOAM TREATED LIGHTWEIGHT SOIL PLACED IN COASTAL AREAS

Abstract

Air-foam treated lightweight soil which is a mixture of clay, cement and air foam has been utilized in coastal areas. Its construction results are extending because we can expect its high performance for weight, strength and stiffness. However, it is recently pointed out that the lightweight soil can be significantly damaged under inappropriate circumstances. This paper summarizes 10-year follow up study of the lightweight soils placed in backfill of seawall in both Kobe Port Island and Tokyo International Airport. It was confirmed that the physical and mechanical properties of the lightweight soil were maintained their required performances, indicating that the lightweight soil has sufficient durability as a geo-material.