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Strength experimental on mortar which use Quenched Blast-Furnace Slag as aggregate was carried out for a fundmental study of application possibility of Quenched Blast-Furnace Slag as aggregate. It gives the following results. The strength of mortar use Quenched Blast-Furnace Slag is decrease as substituion rate is higher. As W/C rate increase, the strength decrease, but the strength decrease of fine aggregate rat 1:3 is lower than 1:2. The relation with fine aggregate is that the amount of fine aggregate is inversely proportional to strength. The relation with age is proportional to strength and strength rate of going is lower than general mortar in 28 age. the change of strength proportionately with W/C rate is that as W/C rate increases, the strength is drop ; it shows that it has same tendency as general mortar sand or crushed sand, but while W/C rate increase the strength is as high as general mortar. The reason can be assumed that water cotent per unit needed to Quenched Blast-Furnace Slag is more than in case of sand. In addition, the relation with substituion rate is that the strength is the strongest at substituion rate 25% and 50% ; that is, sometimes it is higher than mortar which use sand 100%. In addition, long age strength of mortar which use Quenched Blast-Furnace Slag as aggregate is about to be studied in the last.

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