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Glass compositions suitable for incorporation into concrete

  • US 4,002,482 A
  • Filed: 11/18/1975
  • Issued: 01/11/1977
  • Est. Priority Date: 02/14/1975
  • Status: Expired due to Term
First Claim
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1. Glasses suitable for use as a long term reinforcing agent in concrete or in other cementitious matrix and having a composition consisting essentially of:

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    space="preserve" listing-type="tabular">______________________________________ Weight Percent ______________________________________ SiO.sub.2 20- 70 TiO.sub.2 3- 12 ZnO 5- 70 CuO 0- 10 Fe.sub.2 O.sub.3 0- 5 BaO 0- 30 CaO 0- 10 MgO 0- 15 Al.sub.2 O.sub.3 0- 30 ______________________________________ wherein the ratio of the molar sum of Al.sub.2 O.sub.3 + MgO + CaO to the molar sum of ZnO + CuO + TiO.sub.2 + Fe.sub.2 O.sub.3 present in the composition is equal to or less than 0.5, in which metallic oxides selected from the group consisting of As.sub.2 O.sub.3, Sb.sub.2 O.sub.3, V.sub.2 O.sub.5, B.sub.2 O.sub.3, PbO, CdO, SnO.sub.2 and M.sub.2 O wherein M is an alkali metal, if present, amount to not greater than 0.4 mole % altogether, and whereby said composition delays the curing of said concrete or cementitious matrix and increases the formation of heat when said composition reacts with said concrete or cementitious matrix.

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