Experimental Study on Ductility and Toughness of HDPE-Pipe Concrete

Ductility ratio and strain energy that are regarded as the characteristic parameters of ductility and toughness were calculated from axial stress-strain curves of plain concrete and HDPE-pipe concrete.Effect of pipe thickness and core-concrete strength on ductility and toughness of HDPE-pipe concrete was studied.The results indicate that the ductility and toughness of HDPE-pipe concrete is much better than those of the plain concrete.The increase in pipe thickness can enhance the ductility and toughness of HDPE-pipe concrete significantly.However,the increase in core-concrete strength can only enhance the toughness of HDPE-pipe concrete limitedly and consumedly impair the ductility of HDPE-pipe concrete.