New PDF release: Fly Ash in Concrete: Properties and performance (Rilem

Methods Materials

By K. Wesche

ISBN-10: 0419157905

ISBN-13: 9780419157908

This ebook is a state of the art record which files present wisdom at the houses of fly ash in concrete and using fly ash in building. It comprises RILEM tips on fly ash in concrete and a complete bibliography together with over 800 references.

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Additional resources for Fly Ash in Concrete: Properties and performance (Rilem Report)

Sample text

The compositional variation was, however, the same as in pure C3S pastes. Small amounts of ettringite (AFt) and monosulphoaluminate (AFm) phases were found at 7–28 days but, within 3 months, all the Fe, Al and SO4–2 supplied by the fly ash was incorporated in the C-S-H. Ogawa et al. 0 for the Ca/Si ratio from their scanning electron microscopic/energy dispersive spectroscopic measurements. Presumably their measured value was high, because the solid material between the particles contained both the C-S-H and Ca (OH)2, whereas Mohan and Taylor were able to separate the particles more readily after grinding their samples to a fine powder.

Within the first 28 days, only a moderate reaction of fly ash with Ca(OH)2 was observed. Huang /H 37/ found no difference between the hydration of C3S in pure cement paste and in pastes of cement and fly ash, whereas the hydration of C3A was accelerated slightly in the latter case. The amount of Ca(OH)2 in the cement-fly-ash paste reached a maximum value which was roughly the same as in pure cement paste, and remained constant up to 28 days before decreasing significantly. Adding gypsum decreased the early hydration of C3S cement-fly-ash paste but increased it at later ages.

2: Water demand of the binding agent in kg per m3binding agent (according to Kluge) as a function of the f/c ratio; test results for a specific cement/fly-ash combination /B 47/ cement/fly-ash exchange (Fig. 9) and increasing fly-ash fineness (achieved artificially by grinding in the tumbling mill) (Fig. 10). Conversely, given a certain bleeding value, discharge time varies inversely with increasing fly-ash content and increasing fineness; the mortar is more workable without intense bleeding. In all cases, workability was improved by using fly ash.

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Fly Ash in Concrete: Properties and performance (Rilem Report) by K. Wesche

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