高铁灌浆材料专用高效缓凝剂的试验研究

The test research on high efficient retarder special for grouting materials in high-speed railway construction

研究葡萄糖酸钠、硼酸和有机盐类缓凝剂A及其复配产物对硫铝酸盐水泥基高铁灌浆材料凝结时间的影响。结果表明:将葡萄糖酸钠、硼酸和缓凝剂A按合理比例复合配制,在掺量为0.35%～0.40%(以灌浆材料质量计)时,灌浆材料的初始流动度≥320 mm,0.5 h流动度≥280 mm,初凝时间为45～60 min,终凝时间与初凝时间间隔为10～20 min,均满足高铁灌浆材料的性能指标要求。

Effects of sodium gluconate, borax, organic retarder A and their compounds on setting time of the grouting materials based on sulphoaluminate cement were studied. The results showed that when the compounds of sodium gluconate,borax and retarder A were made in rational proportion,the grouting materials with the compound of 0.35%-0.4% had original fluidity （≥320 mm）, fluidity after 30 min （≥280 mm）, original setting time （45-60 min）, the 10-20 min interval between the original and final set- ting times,these properties all satisfied the index requirement of grouting materials used in high-speed railway construction.