Experimental Research On Mechanical Properties And Durability Of Basalt Fiber Reinforced Concrete

The defects such as low tensile strength,easy cracking and poor durability of ordinaryconcrete greatly affect the safety and service performance of concrete structures.In order to improve the performance of concrete,fiber reinforced concrete arises at the historic moment.Basalt fiber is a new kind of high tech fiber with excellent performance,low cost and green environmental protection.It is considered as a good substitute for high technology fibers such as carbon fiber,glass fiber and polypropylene fiber.At present,there are many researches on the mechanical properties and durability of basalt fiber reinforced concrete(BFRC)at home and abroad,but the results are not uniform.And the current researches focus on the basic material properties of BFRC,but the researches on structure is rare.In view of the current research status of BFRC,this paper mainly focuses on the following aspects:(1)The mechanical properties of BFRC are systematically analyzed.By changing the amount and length of basalt fiber,the effects of fiber on the compressive strength,splitting tensile strength,bending strength,axial compression strength,axial compression modulus of elastic modulus,shear strength and impact resistance of the concrete are investigated.(2)The durability of BFRC was experimentally analyzed.The anti permeability,freezing and thawing resistance and early age cracking resistance of BFRC were studied,and the volume content of 0.1%-0.12% was preliminarily determined.(3)The flexural performance of the basalt fiber reinforced concrete beam with fiber content of 0.12% was analyzed.The initial cracking load,the ultimate loading capacity of the cross section,the width of the cracks,the flexural rigidity,the deflection,the strain distribution of the concrete section and the failure form were studied.