Experimental Study Of Anti-bending Capability Of Alkali-resistance Glass Fiber Concrete Beam

With the rapid development of economy,higher and higher standard of building materials is required.At that time,the fiber reinforced concrete,a new composite material,has desirable prospects in engineering application.Amount several kinds of fiber,alkali-resistant glass fiber has numerous advantages,such as high strength,light weight,moderate price,superior thermal performance,etc.,so that it might be suitable for popularization in concrete application.This paper investigates the mechanical performance under flexural loading of alkali-resistant glass fiber concrete.2 ordinary concrete beams and 6 alkali-resistant glass fiber concrete beams in which alkali-resistant glass fiber volume ratios are 1%,1.5%,2% respectively,are loaded by flexural loading,and then cracking load,ultimate stress,deflection and crack propagation are studied during the loading process,meanwhile,which are simulated by finite element software ABAQUS.The results showed that,the destroyed phenomenon under flexural load in alkali-resistant glass fiber concrete beam is comparable to that of ordinary concrete beam.Four stages,elastic phase,the cracking stage,the yield stage and limited stage,are observed in the loading process;alkali-resistant glass fiber concrete beams have better resistance to the propagation of initial crack and cracking by load at each level;the incorporation of alkali-resistant glass fiber into concrete improves the cracking load and ultimate load,to some extent.Cracking load exhibits the biggest increase and rises by 14% when the fiber volume ratio is 2%.Besides,the addition of 1.5 vol.% fiber increases the ultimate load by 6%.The equation relevant to ordinary concrete beam in standard ?Concrete Structure Design Standard?(GB50010-2010)is used to characterize the cracking load,ultimate load,maximum crack width and deflection of alkali-resistance glass fiber concrete beam.It shows that the standard of ordinary concrete beam is also suitable for alkali-resistance glass fiber concrete.Moreover,these indexes,cracking load,ultimate load,maximum crack width and deflection are revised based on ? Technical Specification for Fiber Concrete Structure?(CECS38-2004)and experimental results,and then verify the feasibility of the formula proposed.Finally,the finite element software ABAQUS is used to simulate the alkali-resistant glass fiber concrete beam.The simulation results are basically consistent with the experimental results,conclusions can be drawn that the finite element analysis can be used as a means to study the flexural performance of alkali resistant glass fiber reinforced concrete beams.