Comparisons among magnetic and non-magnetic fly ash fractions: Strength development of cement-fly ash mortars
- Univ. Politecnica de Valencia (Spain)
Nowadays the continual increase in energy demand produces higher consumption of coal and lignite and, consequently, in a parallel way, fly ash production steps up. Magnetic extractions from aqueous-fly ash suspensions produced magnetic and non-magnetic fly ash fractions. Several fractions were obtained from an original fly ash (T0), from T0 and further grinding, and from a ground fly ash (T60). Magnetic and non-magnetic samples were characterized: chemical composition, granulometric data, specific gravity and specific surface area. Workability studies on mortars containing these fractions were carried out. Generally, non-magnetic fractions yielded mortars with similar or higher flowability than mortars containing the corresponding magnetic fractions. On the other hand, compressive strength development studies showed that non-magnetic fractions are more pozzolanic than magnetic ones; moreover, optimum replacing percentage of cement by fly ash fractions was 45% for non-mechanically treated samples, whereas for ground fractions optimum values were 30% for non-magnetic samples and 45% for magnetic ones.
- Sponsoring Organization:
- DGICyT (Spain)
- OSTI ID:
- 464829
- Report Number(s):
- CONF-9509276-; ISSN 0956-053X; TRN: IM9720%%41
- Journal Information:
- Waste Management, Vol. 16, Issue 1-3; Conference: International symposium on bulk `inert` waste: an opportunity for use, Leeds (United Kingdom), 21-22 Sep 1995; Other Information: PBD: 1996
- Country of Publication:
- United States
- Language:
- English
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