Research on the Adhesion of Steel Fiber in Ultra-High Performance Concrete
The adhesion between steel fibers and concrete matrix is the key to stress conversion and crack control,and can significantly affect the mechanical properties of Ultra-High Performance Concrete(UH-PC).To enhance the adhesion of steel fibers,a Microorganism Induced Calcite Precipitation(MICP)tech-nique is proposed to pretreat the surface of steel fibers.The research results indicate that MICP not only generates calcium carbonate crystals on the surface of steel fibers,but also leads to an increase in roughness of steel fibers.It also improves the adhesion and drawing performance of steel fibers,allowing hydration products to adhere to the surface of the fibers.The microscopic results indicate that MICP technique can enhance the adhesion behavior between steel fibers and matrix.Therefore,MICP technique can increase the compressive strength and flexural strength of UHPC by 16％ and 50％ respectively by treating steel fi-bers.The application of MICP technique in UHPC can help improve the adhesion performance of steel fi-bers.
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