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Title: Method for increasing the rate of compressive strength gain in hardenable mixtures containing fly ash

The present invention relates to concrete, mortar and other hardenable mixtures comprising cement and fly ash for use in construction. The invention provides a method for increasing the rate of strength gain of a hardenable mixture containing fly ash by exposing the fly ash to an aqueous slurry of calcium oxide (lime) prior to its incorporation into the hardenable mixture. The invention further relates to such hardenable mixtures, e.g., concrete and mortar, that contain fly ash pre-reacted with calcium oxide. In particular, the fly ash is added to a slurry of calcium oxide in water, prior to incorporating the fly ash in a hardenable mixture. The hardenable mixture may be concrete or mortar. In a specific embodiment, mortar containing fly ash treated by exposure to an aqueous lime slurry are prepared and tested for compressive strength at early time points.
 [1];  [2];  [3];  [4]
  1. (Belle Mead, NJ)
  2. (Parsippany, NJ)
  3. (Bangkok, TH)
  4. (late of Livingston, NJ)
Issue Date:
OSTI Identifier:
New Jersey Institute of Technology (Newark, NJ) NETL
Patent Number(s):
US 5681384
Contract Number:
Research Org:
New Jersey Institute of Technology (Newark, NJ)
Country of Publication:
United States
method; increasing; rate; compressive; strength; hardenable; mixtures; containing; fly; ash; relates; concrete; mortar; comprising; cement; construction; provides; mixture; exposing; aqueous; slurry; calcium; oxide; lime; prior; incorporation; contain; pre-reacted; particular; added; water; incorporating; specific; embodiment; treated; exposure; prepared; tested; time; mortar containing; comprising cement; mixtures comprising; hardenable mixture; compressive strength; calcium oxide; mixture containing; fly ash; aqueous slurry; specific embodiment; containing fly; hardenable mixtures; mixtures containing; /106/264/