Abstract
Due to the shortages in traditional fly ash, there is increased interest in using non-traditional coal ash (NTCA) in concrete mixtures. NTCA shows great promise for use in concrete, but there are concerns with the consistency of the material. One area of concern is the impact of the NTCA and traditional fly ash on the air entrainment agent (AEA) demand in concrete. This work aims to investigate the correlation of the foam index [FI], loss on ignition (LOI), and nitrogen surface area (BET), with the AEA dosage required to produce 6% air in a concrete mixture for 12 different coal ash sources. The results show that the foam index has the best correlation with the AEA dosage in concrete. When the LOI is less than 6%, there is a correlation to AEA dosage in concrete, but this same relationship does not hold for fly ash with LOIs greater than this. The LOI and BET show a direct relation to the materials investigated in this study.
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04 March 2024
A Correction to this paper has been published: https://doi.org/10.1617/s11527-024-02327-9
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This work was sponsored by funding from the U.S. Department of Transportation [FHWA-PROJ-19-0017].
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Appendices
Appendix 1: Specific materials used to complete the foam index test
Appendix 2: R-squared values for all trend lines of the twelve concrete mixtures
Table 5 shows all the R-squared values of a set of data from concrete mixtures at different AEA demands (the increase in percent air by the total volume of the concrete mixture) and all the plots are provided in Fig.
7. The R-squared value of each ash source represents the average dosage lines of two concrete mixes with the same fly ash. The dosage performance of each fly ash in concrete shows consistently above an R-squared value of 0.92 for all the sources.
Appendix 3: Table of foam index values at different mix conditions
Code | Mix condition | |||
---|---|---|---|---|
2 g of ash + 8 g of cement | 5 g of ash + 5 g of cement | |||
Form index | STDEV | Form index | STDEV | |
TC | 0.88 | 0.06 | 1.16 | 0.13 |
TF | 1.76 | 0.04 | 2.86 | 0.10 |
PNF1 | 1.08 | 0.00 | 2.27 | 0.04 |
PNF2 | 1.38 | 0.08 | 3.88 | 0.07 |
PNF3 | 0.88 | 0.04 | 1.43 | 0.08 |
PNF4 | 0.83 | 0.07 | 1.35 | 0.04 |
PNF5 | 2.53 | 0.10 | 4.21 | 0.07 |
PNF6 | 0.94 | 0.04 | 1.02 | 0.08 |
PNF7 | 1.13 | 0.04 | 1.32 | 0.07 |
BLF1 | 1.87 | 0.04 | 2.76 | 0.08 |
BLF2 | 1.65 | 0.07 | 1.46 | 0.04 |
BLF3 | 1.20 | 0.05 | 2.31 | 0.07 |
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Kang, S., Emerson, L., Lee, J. et al. Determining the air-entraining admixture dosage in concrete with non-traditional coal ash. Mater Struct 56, 9 (2023). https://doi.org/10.1617/s11527-022-02098-1
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DOI: https://doi.org/10.1617/s11527-022-02098-1