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本文通过对采用NF与木钙复合减水剂的效果进行试验研究,结果表明:对于硅酸盐水泥或普通硅酸盐水泥,采用0.25～0.35％木钙+0.65～0.75％NF复合减水剂,其减水、增强效果与单掺1％NF减水剂相差不大。 通过对混凝土坍落度损失进行试验测定,结果表明:当混凝土水灰比为0.55时,采用0.25％木钙+0.75％NF复合减水剂、1％NF减水剂及不掺减水剂三组混凝土试样进行对比试验,测定其初始坍落度为16～18cm,混凝土配制1.5小时后,采用复合减水剂的混凝土坍落度保持14cm,坍落度损失明显低于另外两种试样。 由试验结果可以看出,采用木钙与NF复合减水剂具有良好的减水效果及流化效果,而且用木钙取代部分NF后,降低了减水剂造价,提高了经济效益。
In this paper, the effect of using NF and wood calcium compound superplasticizer was tested. The results show that: for Portland cement or ordinary Portland cement, 0.25 ~ 0.35% wood calcium + 0.65 ~ 0.75% NF composite water reducer , Its water reduction, enhancement effect and single-doped 1% NF water reducing agent is not much difference. Through the test of concrete slump loss, the results show that: when the concrete water-cement ratio is 0.55, using 0.25% wood calcium +0.75% NF composite water reducing agent, 1% NF water reducing agent and no water reducing agent The concrete samples were subjected to a comparative test and the initial slump was determined to be 16 to 18 cm. After 1.5 hours of concrete preparation, the slump of the concrete using the composite water-reducing agent remained at 14 cm, and the slump loss was significantly lower than that of the other two samples. . From the test results, it can be seen that the use of wood calcium and NF composite water reducer has a good water reduction effect and fluidization effect, and after replacing part of the NF with wood calcium, reducing the water reducing agent cost, and improving economic efficiency.