Influence of size fraction of ponded ash on its pozzolanic activity

Journal Article · Fri May 01 04:00:00 EDT 1998 · Cement and Concrete Research

DOI:https://doi.org/10.1016/S0008-8846(98)00036-2· OSTI ID:619619

Ranganath, R V; Bhattacharjee, B; Krishnamoorthy, S ^[1]

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1. Indian Inst. of Tech., New Delhi (India). Dept. of Civil Engineering

The paper examines the role of different size fractions of ponded ash, characterized in terms of their physical nature and chemical composition, on the lime-reactivity strength of ash-lime-sand mortars. The paper also presents SEM and MIP characterization of different size fractions. The results of the investigation show the strong influence of the fine particles on their physical properties and lime-reactivity strength of mortars. Ponded ash contains both reactive, small particles and non-reactive or poorly reactive large particles, due to which it loses its overall pozzolanicity. Its use as a pozzolan in cement concrete will only be possible if the non-reactive large sizes particles are separated from it. The paper concludes that the practice of wet disposal of fly ash adopted mostly in India is detrimental to the pozzolanic activity of the ash.

• OSTI ID: 619619
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 5 Vol. 28; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
36 MATERIALS SCIENCE
ACTIVATION ENERGY
FLY ASH
MORTARS
PARTICLE SIZE
SETTLING PONDS
WASTE DISPOSAL
WASTE PRODUCT UTILIZATION