通过添加磷酸二氢钠改善了水泥糖浆砂的可使用时间,并测定了添加缓凝剂后不同时间段型砂的湿强度。实验结果表明,适宜的加入0.02%磷酸二氢钠能使水泥糖浆砂延缓凝结,此时型砂的可使用时间在45 min左右,在4 h时其湿强度接近0.1 MPa。 By adding sodium dihydrogen phosphate, the service life of cement syrup sand was improved, and the wet strength of sand at different time after adding retarder was measured. The experimental results show that the appropriate time of adding sodium dihydrogen phosphate can make the cement syrup sand retard the setting time. At this time, the sand can be used for about 45 minutes, and its wet strength is close to 0.1 MPa at 4 hours.