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铝酸盐液体速凝剂的改性及其适应性研究

作者:李殿权

关键字:铝,酸盐,液体,速凝剂,的,改性,及其,适应性,

 
(重庆建研科之杰新材料有限公司,重庆  402760)
    摘要:通过调整铝酸盐液体速凝剂中氢氧化钠与氢氧化铝的摩尔比(MR),并复合硅酸钠、聚丙烯酰胺、三乙醇胺和增稠剂对液体速凝剂进行改性。实验结果表明,铝酸盐速凝剂的固含量不宜超过55%,否则对混凝土后期强度产生不利影响;MR越小,速凝剂稳定性越差,但有利于缩短水泥的凝结时间,复合改性铝酸盐液体速凝剂的MR应大于1.3。制备改性速凝剂(S50-2-8)的最佳配比为:m(氢氧化铝)∶m(氢氧化钠)∶m(聚丙烯酰胺)∶m(三乙醇胺)∶m(增稠剂)∶m(硅酸钠-碳酸钠改性剂)∶m(水)=29∶22∶0.2∶1.0∶1.0∶20∶49,该速凝剂充分发挥了各组分的协同作用,提高了与不同水泥之间的适应性,性能符合GB/T 35159—2017《喷射混凝土用速凝剂》的要求。
    关键词:铝酸盐液体速凝剂;改性;适应性;MR
    中图分类号:TU528.042        文献标识码:A        文章编号:1001-702X(2020)11-0077-04
 
Study on modification and adaptability of aluminate accelerator
LI Dianquan
(Chongqing Jian Yan KZJ New Material Co. Ltd.,Chongqing 402760,China)
    Abstract:Liquid accelerator was modified by adjusting the molar ratio(MR) of sodium hydroxide to aluminum hydroxide in
the aluminate accelerator,and compounding sodium silicate,polyacrylamide,triethanolamine and thickener. The results show that:To make sure the late strength,the solid content of accelerator should not exceed 55%. The lower MR,the shorter setting time,but the worse stability. The MR of the modified accelerator must be greater than 1.3. The best ratio for preparing modified accelerator(S50-2-8) is:m(aluminum hydroxide):m(sodium hydroxide):m(polyacrylamide):m(triethanolamine):m(Thickener):m(sodium silicate-sodium carbonate modifier):m(water)=29∶22∶0.2∶1.0∶1.0∶20∶49. Because of the synergistic effect of each component,the adapt-
ability between this accelerator and different types of cement was improved,and all indicators meet with standard GB/T 35159—2017 "Flash setting admixtures for shotcrete".
    Key words:aluminate accelerator,modification,adaptability,MR