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本文研究通过三因素极端顶点设计的混料设计方法设计了三元胶凝材料水泥—粉煤灰—矿粉体系,探33讨了三元胶凝材料体系对混凝土力学及工作性能的影响,建立了回归模型,绘制了三元胶凝材料水泥—粉煤灰—矿粉体系混凝土3、7、28、56d的抗压强度等高线及粉煤灰与矿粉对混凝土坍落度及当量流动度作用曲面。研究结果表明:单掺粉煤灰28d(包括28d)龄期前,混凝土的抗压强度随着粉煤灰掺量的增加而降低;而单掺矿粉7d(包括7d)龄期后,混凝土的抗压强度随着矿粉掺量的增加而增加。无论单掺或双掺粉煤灰与矿粉均能提高混凝土的56d抗压强度,而且矿粉对56d抗压强度的影响已超过水泥。利用粉煤灰和矿粉双掺的优势互补,既提高了坍落度也增加了流动度,大大改善混凝土的工作性能。
In this paper, the ternary cementitious material cement-fly ash-slag system was designed by the mixed design method of the three-factor extreme vertex design. The influence of ternary cementitious material system on the mechanics and working performance of concrete was discussed. The regression model was drawn and the compressive strength contour lines of ternary cementitious material cement-fly ash-slag system concrete at 3, 7, 28 and 56 days and the slump and equivalent flow of fly ash and slag on concrete Degree of effect surface. The results show that the compressive strength of concrete decreases with the increase of fly ash content before 28d (including 28d) age, while the single compressive strength of fly ash decreases with the increase of fly ash content. After 7d (including 7d) Compressive strength increases with the increase of slag content. Whether single or double mixed fly ash and slag can improve the 56d compressive strength of concrete, and the effect of slag on 56d compressive strength has exceeded that of cement. The use of fly ash and slag double advantage of each complement each other, both to improve the slump and increase the mobility, greatly improving the performance of concrete work.