Abstract：To study the changes of the mechanical properties of coral concrete under different sisal fiber contents, the experiment is researched on the cube compressive strength, splitting tensile strength, flexural strength and microstructure of sisal fiber reinforced coral concrete, to determine the optimum amount of sisal fibers and provide a reference for further study of other properties and applications of sisal fiber reinforced coral concrete. The test results showed that the dosage of 3 to 4. 5 sisal fiber can significantly improve the flexural strength and splitting tensile strength of coral concrete, but the impact on the cube compressive strength of sisal fiber reinforced coral concrete is small. The incorporation of sisal fiber can improve the brittleness of coral concrete and make it exhibit good ductility when it is destroyed.

Keyword：sisal fiber;coral concrete;mechanical properties;microstructure;