Reuse Of Micronized Fly Ashes In
High Strength Cement Conglomerates
Author(s)
G. Belz, P. Caramuscio, G. Intini, L. Liberti, C. Marti
& M. Notarnicola
Abstract
In this paper the experimental results of an investigation carried out in
collaboration with ENEL (the Italian Company for electric energy) on the use of
micronized fly ash from coal combustion as pozzolanic material for production
of high strength cement conglomerates are presented. The grinding of fly ash
was carried out in ball, ring and jet mills; the size distribution of micronized
material was similar to silica fume, normally used to produce high performance
conglomerates due to its very high specific surface. Mechanical strength tests
were performed on mortars with different substitution of cement or sand
(between 10 and 30 % in weight) with micronized fly ash (MFA), raw fly ash
(RFA) and silica fume (SF) respectively. The water/cement ratio (w/c) was
regulated to obtain equal workability of the pastes (from 0,35 to 0,4). The values
of compression and bending strength of mortars prepared with MFA were not
greatly influenced by the quantity of substituted material and water content
present in the mortar. Moreover, good mechanical performance was obtained in
shorter times than RFA, with a behaviour similar to more expensive SF. The
results obtained show that the improved chemico-physico-mechanical
characteristics of micronized fly ash make feasible the reuse of this by-product in
high strength cement conglomerates.
Keywords: fly ash, coal combustion, grinding treatment, cement conglomerates.
1 Introduction
Fly ash from coal combustion in power plants can either be considered as a
burdensome waste, if landfilled, or a great resource for a wide range of uses, if
Keywords
fly ash, coal combustion, grinding treatment, cement conglomerates.
Related Book
Other papers in this volume
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