Method for increasing the rate of compressive strength gain in hardenable mixtures containing fly ash
Patent
·
OSTI ID:541716
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. 2 figs.
- Research Organization:
- New Jersey Institute of Technology
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-90PC90299
- Assignee:
- New Jersey Inst. of Tech., Newark, NJ (United States)
- Patent Number(s):
- US 5,681,384/A/
- Application Number:
- PAN: 8-427,045
- OSTI ID:
- 541716
- Country of Publication:
- United States
- Language:
- English
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