Study of Influence of Amorphous Rice Husk-Ash in Concrete Properties

Title: Study of Influence of Amorphous Rice Husk-Ash in Concrete Properties
Author(s): Hasparyk
Paper category : conference
Book title: International RILEM Conference on the Use of Recycled Materials in Building and Structures
Editor(s): E. Vázquez, Ch. F. Hendriks and G.M.T. Janssen
Print-ISBN: 2-912143-52-7
e-ISBN: 2912143756
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 751 - 760
Total Pages: 10
Nb references: 22
Language: English

Abstract: This paper presents an experimental program carried out with conventional concrete using
rice husk-ash (RHA) in partial substitution for cement. The RHA is a product obtained from
the generation process of electric power in a thermoelectric Power Plant. The ash is produced
in suspension, inside a furnace with controlled burning, resulting in a completely amorphous
material.
The experimental program comprised the physical, chemical and micro structural
characterization of the pozzolan RHA, including ana lyses by the X-ray diffraction technique.
The hydration heat of cement combined with RHA was also verified. Tests with mortar,
aimed at studying the efficiency of pozzolan in reducing the alkali-aggregate reaction (AAR),
and with concrete, in order to investigate its properties, were also performed in the presence
of RHA. The RHA was used in two conditions - in natural and in ground states - and was
employed in substitution for cement in 5 contents as follows: 8%, 10%, 12%, 16% and 20%.
The main results indicate a high pozzolanic activity of the RHA studied, which proved
effective in reducing the AAR expansion. In addition, the concrete properties evaluated with
RHA incorporation proved satisfactory. The results of this study indicate that this RHA is an
attractive pozzolanic admixture due to its high reactivity as well as its environmental benefits.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.083