Comparative Experimental Study On Mechanical Properties Of Hybrid Fiber Reinforced Concrete

The problems of low tensile strength,high brittleness,and poor crack resistance of concrete make it unable to meet the high-performance requirements of contemporary buildings.Incorporating an appropriate amount of fiber-reinforced materials can effectively toughen and reinforce concrete,improve the working performance of concrete,and promote the application and development of concrete.Hybrid fibers can use the positive hybrid effect to achieve a performance improvement effect that surpasses single-blend fibers.As a new type of fiber,chopped basalt fiber is environmentally friendly,cost-effective,and has great research value.Through mechanical tests,microscopic tests,and theoretical analysis,this paper explores the reinforcing effects,hybrid effects,and energy dissipation mechanisms of the chopped basalt fiber structure of single-blend and hybrid fibers.The main contents and conclusions of the research are as follows:(1)Through mechanical performance tests,study the toughening effect of chopped basalt fiber on the failure mode of concrete,the volumetric addition of chopped basalt fiber on the compression,splitting and flexural strength of concrete of different ages,and the effect on different ages.The optimal content of chopped basalt fiber is obtained by reducing the compression ratio and the compression ratio of concrete,and the fitting formula for the compression,splitting and flexural strength of the chopped basalt fiber concrete is established for the volume content of the fiber.(2)Through the mechanical performance test,compare and study the enhancement effect of basalt,steel,carbon,and polypropylene fiber on the compression,splitting and flexural strength of concrete and the reduction effect on the compression ratio and flexure ratio of concrete.To study the effect of basalt-steel,basalt-carbon,basalt-polypropylene hybrid fiber content on the compression,splitting,and flexural strength of concrete,the hybrid effect,and the reduction effect on the compression ratio and compression ratio of concrete.The best type and amount of blended and mixed fiber.(3)Observe the distribution of hydrates,cracks,pores,fibers,aggregates,etc.in the microscopic interfaces of plain concrete and fiber concrete,such as paste,aggregate-paste,and fiber-paste through scanning electron microscope experiments.Morphology,analyze the working methods of different fibers,study the mechanism of fiber reinforcement and toughness,establish a theoretical model of fiber energy consumption,obtain an empirical formula for fiber energy consumption,calculate and compare the theoretical energy consumption effects of various single-blend and hybrid fibers,and verification with test results.