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- W2187518172 abstract "Coal-burning electric utilities have increasingly turned to low-NOx burners (LNB) to reduce nitrous oxide emissions. It is well documented that changes in the form and quantity of unburned carbon in low-NOx fly ash, as well as the possible presence of ammonia compounds, have negatively impacted the use of fly ash in concrete. Less well documented are possible changes in low-NOx fly ash that may impact strength activity index (SAI) values, including particle shape and size and glass content. In this study samples of fly ash were obtained before and after the change to LNB at a plant consistently burning a southern lignite from one mine. Samples were tested for Strength Activity Index (SAI) according to ASTM C 311, affinity for air-entraining admixtures, chemical composition, particle size and shape, glass content, and phase assemblage by quantitative x-ray diffraction (Q-XRD). SAI values at 3, 7, 28 and 56 days for low-NOx fly ash were consistently 10% lower than the corresponding values for the fly ash before the burner change. No significant change in bulk chemical composition was found between samples taken before and after LNB installation. Fly ash produced after LNB went online have slightly greater and more active carbon contents, more coarse particles, and slightly less glass which can explain the reduction in SAI observed. Although this study involves samples from only one plant, it does document the possibility of lower SAI values after changing to LNB. Since fly ash is extensively used as a pozzolanic material in concrete, the reduced SAI can affect the strength development of concrete. Chemical admixtures have been used in concrete containing this low-NOx fly ash to restore strengths to the level prior to LNB installation." @default.
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- W2187518172 date "2007-01-01" @default.
- W2187518172 modified "2023-09-24" @default.
- W2187518172 title "The Influence of Fly Ash After Change to Low-NOx Burners on Concrete Strength - Case Study" @default.
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