ABSTRACT
There has been a sharp increase in Japan over the past ten years in the application of so-called soil mortars, made by mixmg soil, cement, water, and admixtures. Among soil mortars, ERS mortars (soil mortars made of excavated recycled soils) are produced by mixing soil with cement slurry. To produce ERS mortar o f controlled quality, it is necessary to continually modify the mixture proportions carefully throughout the construction period because of the nonuniformity of the soil. The authors have devised a practical method for determining mixture proportions which involves referencing a diagram in which the optimum mixture proportions are expressed as a function of the fine fracture content of the soil. Furthermore, they have found that the compressive strength of a soil mortar, including ERS mortar, at a material age of 28 days can be predicted from its compressive strength at 7 days and its water-cement ratio. This information will enable mixture proportions to be determined even more efficiently.
