Formulas to predict unconfined compression strength of the granular quicklime and the blast furnace cement-treated Ariake clay are proposed. In the proposed formula the strength of quicklime-treated Ariake clay is given by the amount of quicklime, the amount of oil, and the amount of quicklime-silica obtained from the physical-and-chemical analysis. And the strength of blast furnace cement-treated Ariake clay is given by the amount of blast furnace cement and the amount of blast furnace cement–silica.
In the case of the granular quicklime, multiple regression coefficient R of the proposed formula was 0.8693, and in the case of the blast furnace cement multiple regression coefficient R was 0.8787. The combination design method calculated from the regression line of survey strength and prediction strength was proposed.The strength prediction method of this research showed a possibility that the accessory role of an unconfined-compressive-strength examination could be achieved as a prediction method of strength of Ariake clay foundation improvement construction.
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