Foamed Concrete(FC)has obvious problems of low strength and poor toughness.Coir Fiber(CF)is a natural material with high tensile strength and excellent toughness,so it can be used to improve the brittleness,strength and energy absorption properties of foam concrete,and broaden its engineering applications.In this study,four sets of specimens were prepared and tested by static compression test and Hopkinson's compression bar impact test at three impact air pressures(0.20 MPa,0.25 MPa and 0.30 MPa),respectively.Hopkinson impact tests at three impact air pressures(0.20 MPa,0.25 MPa and 0.30 MPa)were conducted to investigate the effects of coconut fiber admixture(0,1.0％,1.5％,2.0％and 2.5％)on the failure modes,dynamic and static compressive strengths,static load-displacement curves,dynamic stress-strain behaviors,and energy-consuming properties of the foam concrete.The results showed that the static compressive strength,modulus of elasticity,peak stress,residual stress,and compression energy absorption at a CF content of less than 1.5％were up to 1.51 MPa,respectively.When the CF content is 1.5％,the dynamic compressive strength reaches 2.27 MPa(dynamic air pressure:0.20 MPa),3.18 MPa(dynamic air pressure:0.25 MPa)and 4.21 MPa(dynamic air pressure:0.30 MPa).Dynamic air pressures of 0.20 MPa,0.25 MPa and 0.30 MPa,the peak dynamic energy absorption was 8.9 J(2.0％CF content),14.9 J(1.5％CF content),and 22.4 J(1.5％CF content),respectively.However,the static compression and dynamic impact energy absorption properties of the foam concrete decreased when the CF dosage was too much.Moderate CF amount can significantly improve the static and dynamic properties of foam concrete,and the plastic properties of specimens under static compression and dynamic impact increased significantly with the increase of fiber admixture,and the optimum level of this test was reached at a CF content of 1.5％.
维普
万方数据
