新型铝硅酸盐胶凝材料的研究——激发剂对粉煤灰基铝硅酸盐胶凝材料强度性能的影响

Effect of activators on the strength of fly ash-based binder

本文研究激发剂种类及浓度对粉煤灰基铝硅酸盐胶凝材料强度性能的影响。结果表明,在纯粉煤灰中加NaOH和KOH溶液,试样强度较低,28d强度在3MPa左右。Na2SiO3溶液浓度增加试样强度增大,浓度为5M时效果最好,其中试样14d和28d强度分别为3.3MPa和9.4MPa。K2SiO3浓度增加,试样强度呈现先增后减,在K2SiO3浓度为2M时,强度达最大值,14d和28d强度分别达10.3MPa和28.8MPa。各浓度的K2SiO3溶液的效果远好于Na2SiO3溶液。两种溶液复合时,如10M NaOH∶2M K2SiO3=0.5∶1和10M KOH∶2M K2SiO3=0.5∶1两种配比起到良好的激发效果,其中后者的14d、28d强度分别达9.6MPa、18.1MPa。

The effects of the kind and concentration of activators on the strength of fly ash-based binder were studied in this paper.The results of the study showed,when added NaOH and KOH solutions into fly ash,the strength of samples were quite low,and the 28d strength of samples were only about 3MPa.When added K_2SiO_3 solution,the strength of samples increase with increasing concentration of Na_2SiO_3.The highest strength was obtained when the concentration of Na_2SiO_3 was 5M,which has 14d and 28d strength of 3.3MPa and 9.4MPa separately.When added K_2SiO_3 solution,with increasing concentration,the strength of samples first increase and then decrease.The max strength appeared at concentration of 2M and the max strength of 14d and 28d were 10.3MPa and 28.8MPa,respectively.The effect of K_2SiO_3 was much better than Na_2SiO_3.When added composite solution,the solutions of 10M NaOH∶2M K_2SiO_3=0.5∶1 and 10M NaOH∶2M K_2SiO_3=0.5∶1 had obvious effect,and the latter had 14d and 28d strength of 9.6MPa and 18.1MPa separately.