Alkaline Activation of Fly Ashes. Manufacture of Concretes not Containing Portland Cement

Title: Alkaline Activation of Fly Ashes. Manufacture of Concretes not Containing Portland Cement
Author(s): Fernández-Jiménez
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: 863 - 870
Total Pages: 8
Nb references: 15
Language: English

Abstract: The alkaline activation of industrial sub products (specially those residues coming
from the mining activity and from the energy sector) is a chemical process that allows
obtaining new cement materials. It is spreading a lot among the groups of investigation
around the world, since it offers the possibility of making more inexpensive conglomerates,
which are more ecological and have properties that in many cases allow to overcome and to
improve the well known advantages of portland cement concrete.
In this document there is a rough description about the mechanisms through which
the alkaline activation of the fly ashes passes. Nonetheless, it is given a special importance to
the technological applications of the material due to the fact that some of its properties
improve considerably when it is compared with Portland cement concrete.
Therefore, from a technological point of view, it is necessary to emphasize that the
mortars and concretes elaborated with activated fly ash, without Portland cement, develop
high mechanical strength in short periods of time. Also, they seem to have a very low level
of shrinkage and an excellent capacity for adherence to the aggregate and to the
reinforcement steel. In the present investigation there is a specific case of a possible
industrial application of these new concrete in the sector of precast industry.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.095