Being cured under nature atmosphere, mortar specimens added with plant fiber and sand can produce more holes to increase CO2 entrance, so the maturation time could be shortened.

• 而添加麻绒、砂之灰缝试体，在自然环境养护条件下，因能在灰缝中制造孔隙而增加CO2进入，故能缩短灰缝养护之时间；