Abstract
Shirasu is a kind of pyroclastic flow deposits and the huge volume of it accumulates in the southern part of Kyushu. Further investigation will be needed to develop a new technology for useful application of shirasu more extensively. In the present study that targeted concrete secondary products, we have examined material properties (mix proportion, strength and long term property and so on) of shirasu mortars with white cement. As a result, the compressive strength versus cement-water ratio relationship of white cement shirasu mortars was linear like a normal concrete. The sand-cement ratio had little influence on the compressive strength of white cement shirasu mortar.
