a initial setting of mortar containing 0.2% xylitol and 2% sodium phosphate dibasic dodecahydrate was found to become fast. And a initial setting of mortar containing 0.3% xylitol was found to become slow. Also, mortar containing xylitol and PCM can reduce of maximum temperature and increase compressive and tensile strength compared to the plain mortar and mortar containing blast-furnace slag.