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Cementitious materials

  • US 5,575,841 A
  • Filed: 12/29/1993
  • Issued: 11/19/1996
  • Est. Priority Date: 06/19/1990
  • Status: Expired due to Term
First Claim
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1. A shaped article comprising:

  • a cured matrix material having a plurality of hollow fibers dispersed therein, said hollow fibers having a releasable modifying agent contained therein, means for maintaining the modifying agent within the fibers until released and means for permitting release of the modifying agent from the hollow fibers into the matrix material in response to at least one external stimulus.

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