Experimental Study on Mechanical Properties of Concrete Confined with Plastic Pipe

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Title: Experimental Study on Mechanical Properties of Concrete Confined with Plastic Pipe

Author(s): Junyan Wang and Quanbing Yang

Publication: Materials Journal

Volume: 107

Issue: 2

Appears on pages(s): 132-137

Keywords: ductility; high-density polyethylene pipe; strength; stressstrain curve.

Date: 3/1/2010

Abstract:
Plastic pipe-confined concrete (PPC) is a composite system obtained by filling a plastic pipe with concrete. PPC focuses on piers exposed to the tidal zone or the air-earth zone in marine and saline environments and protects them from salt damages by isolating and eliminating the exposed zones of the concrete structure from the aggressive substances. High-density polyethylene (HDPE) pipes were chosen to make PPC. Ultimate strength, the stress-strain curve, ductility of PPC and the effects of plastic-pipe thickness, and the compressive strength of core concrete fcu on them were investigated in this paper. Results indicate: 1) the ductility ratio of PPC is 1.17 to 4.27 times that of common concrete (CC), and the energy absorption E of PPC is 10.7 to 26 times that of CC; 2) the pipe thickness and fcu have significant effects on onset behavior and post-peak behavior of the stressstrain curves and the ultimate strength of PPC; and 3) the ductility ratio of PPC greatly increases with the increase of pipe thickness and decreases with the increase of fcu.