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

Patent ·
OSTI ID:871207
 [1];  [2];  [3]
  1. Belle Mead, NJ
  2. Parsippany, NJ
  3. Bangkok, TH
+ Show Author Affiliations

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.

Research Organization:
New Jersey Institute of Technology (Newark, NJ)
DOE Contract Number:
FG22-90PC90299
Assignee:
New Jersey Institute of Technology (Newark, NJ)
Patent Number(s):
US 5681384
OSTI ID:
871207
Country of Publication:
United States
Language:
English

References (2)

Hydration of fly ash-portland cements journal July 1984
Optimized determination of PFA (fly ash) fineness with reference to pozzolanic activity journal July 1980

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Related Subjects

/106/264/
added
aqueous
aqueous slurry
ash
calcium
calcium oxide
cement
compressive
compressive strength
comprising
comprising cement
concrete
construction
contain
containing
containing fly
embodiment
exposing
exposure
fly
fly ash
hardenable
hardenable mixture
hardenable mixtures
incorporating
incorporation
increasing
lime
method
mixture
mixture containing
mixtures
mixtures comprising
mixtures containing
mortar
mortar containing
oxide
particular
pre-reacted
prepared
prior
provides
rate
relates
slurry
specific
specific embodiment
strength
tested
time
treated
water