粉煤灰和硅灰对高强度纤维水泥基材料力学性能影响研究

摘要

Based on the development and application of high-performance FRCC ( Fiber Reinforced Cementitious Composite) , the effect of different content of fly ash and silica fume on the compressive strength, flexural strength and toughness of high-performance FRCC is studied. The results show that the addition of fly ash and silica fume significantly affects the mechanical properties of high-performance FRCC. The specific optimization content with 50% ash and 15% silica fume can make the flexural strength of high-performance FRCC up to 19. 5 MPa, the compressive strength to 75. 2 MPa, and the ratio of bending strength to compressive strength to about 0. 26 . Compared with ordinary fiber reinforced cementitious composite, its flexural strength and compressive strength are increased by 35% and 40%respectively and the ratio of bending strength to compressive strength is increased by about 6%. It can be seen that the optimization mixture can significantly enhance the compressive strength, flexural strength and toughness of high-performance FRCC and may provide reference for practical use.%基于纤维水泥基复合材料的发展和工程应用实际,探讨不同粉煤灰和硅灰掺量对高强度纤维水泥基材料抗压强度、抗折强度以及韧性的影响。研究结果表明：粉煤灰和硅灰的掺加会显著影响高强度纤维水泥基材料的力学性能,具体优化掺量为50%的粉煤灰和15%的硅灰可以使高强度纤维水泥基材料抗折强度增强到19.5 MPa,抗压强度提高至75.2 MPa,折压比达到0.26左右,比普通纤维混凝土在抗折和抗压强度上分别提高了35%和40%,折压比也提高了6%左右,说明该优化配合比能明显增强高强度纤维水泥基材料的抗压强度、抗折强度和韧性,可为该材料的工程应用提供参考。