Use of recycled plastics for structural building forms

摘要

A modular plastic structural composite comprises a web section disposed along a horizontal axis and at least one flange section disposed along a horizontal axis parallel thereto and integrally molded to engage the top or bottom surface of said web section, wherein said composite is formed from a co-continuous immiscible polymer blend of a high density polyolefin and a thermoplastic-coated fiber material. The modular plastic composite may for example be an I-Beam, a C-Beam or a T-Beam. In one application it may be used in a bridge constructed from I-Beams, comprising a plurality of pier-supported parallel rows of larger first I-Beams, and a plurality of smaller second I-beams disposed parallel to one another and fastened perpendicular to and between adjacent rows of the larger first I-Beams, wherein the top and bottom surfaces of the second I-Beam flanges are dimensioned to nest within the opening defined by the top and bottom flanges of the first I-Beams.