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Influence of different sized fractions of a fly ash on workability of mortars

✍ Scribed by E. Peris Mora; J. Payá; J. Monzó

Publisher
Elsevier Science
Year
1993
Tongue
English
Weight
417 KB
Volume
23
Category
Article
ISSN
0008-8846

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✦ Synopsis

The study of fly ash as a replacement to mortar workability using a flow table is presented. Flow table spread (FTS) values were measured and correlations among fly ash replacing percentages, water volumes and granulometric distributions of fly ashes have been established. Linear relationships between FTS values and water volumes were obtained in the 200-225 mL water range (0.5 water/cement+fly ash ratio, 3.0 natural sand/cement + fly ash ratio). An increase of water volume implies greater FTS values. Original fly ash was separated in four fractions with different granulometric distributions. FTS values increase as do specific surface, and FTS values decrease as mean diameter of fly ash increase. For the finest fraction, the lubricant effect was counteracted by water adsorption on fly ash particles surfaces. The shape distribution curves of fly ashes (original and their fractions) has an important influence on workability.

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