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Production of glass powder from waste glass, and products made using the same, especially concrete

  • US 20060130707A1
  • Filed: 12/16/2004
  • Published: 06/22/2006
  • Est. Priority Date: 12/16/2004
  • Status: Active Grant
First Claim
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1. A process for the production of concrete, comprising as a pozzolanic constituent a proportion of glass powder produced by processing a stream of post-consumer waste glass containing items of non-frangible materials, comprising the following steps, performed in the sequence given:

  • producing a dry glass powder comprising particles of which at least a major fraction are of size 325 mesh or finer, and containing no more than about 2% moisture, by;

    pulverizing the stream of post-consumer waste glass containing non-frangible constituents such that glass in said stream is reduced to fragments of average maximum size ⅛

    inch or less, while non-frangible items are not reduced to said size, and performing a size-based separation of said reduced glass fragments from said non-frangible items;

    washing said reduced glass fragments, to separate plastic and paper fragments therefrom, and to remove organic contaminants therefrom;

    drying the washed glass fragments to a moisture content of no more than about 2% by weight; and

    grinding the dried glass fragments into a powder, at least about 60% of the particles of said powder being of no more than 325 mesh particle size; and

    mixing said glass powder with a larger quantity of Portland cement, aggregate materials, and water, to form concrete.

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