| 摘要 |
A composite load bearing structure comprises a main body portion having a top surface and a bottom surface defining a dimension of thickness therebetween, first and second side surfaces defining a dimension of width therebetween, first and second end surfaces defining a dimension of length therebetween, and a first longitudinal axis oriented along the length of the main body portion. The thickness is significantly less than at least the length of the load bearing structure. The main body portion is made of a first composite material comprising a binding constituent in a proportion of about 10% to about 20% by volume, and an aggregate material in a proportion of about 80% to about 90% by volume. The binding constituent comprises polyethylene or a polyethylene blend having at least 10% polyethylene. The aggregate material is in the form of irregular multi-faceted pieces of crushed furnace slag, crushed gravel, crushed limestone, crushed granite, crushed basalt, crushed trap rock, and mixtures thereof, and the pieces of aggregate material are distributed and otherwise arranged within the main body portion so that opposed surfaces of the pieces of aggregate material have at least partial contact, one with another, in a contiguous manner. An inner strengthening member is disposed within the main body, and may comprise reinforcing bars; rolled, drawn, or cast ferrous sections; rolled, drawn, or cast composite alloy sections; plastic, metallic, and carbon based fibers; wire mesh, and expanded metal mesh.
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