Effect of Fly Ash and Silica Fume on Mechanical Properties of High-Performance FRCC

Abstract

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 19.5MPa, the compressive strength to75.2MPa, 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.