Recycling of Power Station Coal Fly Ashes as Building Elements to be Used in Passive Fire Protection

Title: Recycling of Power Station Coal Fly Ashes as Building Elements to be Used in Passive Fire Protection
Author(s): Leiva
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: 881 - 889
Total Pages: 9
Nb references: 11
Language: English

Abstract: In this article, the insulating and mechanical properties of products containing fly ash as a
major component (> 75% w/w) are analysed. Fly ashes from the combustion of pulverised
coal in different Spanish thermal power plants (Los Barrios, Meirama and Lada) were tested
with the aim of better defining the desirable characteristics of this type of ash (class F ASTM)
with regard to the elaboration of insulating materials to be used in doors and fire-resistant
screens in industrial buildings. Thus, the effect of different ashes was studied using gypsum as
binder.
After blending the ashes, binders and water (water / solids = 0.4), 50-mm-diameter, 200-mm-
high cylindrical test probes were made; after a setting time of 28 days, they were placed
in an oven and subjected to a fire resistance curve according to Spanish regulations (EN-UNE
1363-1). The insulating capacity of the cylindrical test probes was measured as the time
needed to reach a temperature of 400°C in the centre of the cylinder. In addition, the
compressive strength, before and after the insulating capacity test, and the dynamic elasticity
modulus of the test probes were measured.
The results show that the origin of the studied ashes does not have a significant influence
on the insulating capacity of the products. Nevertheless, different mechanical properties were
observed due to the characteristics of the ashes. These results allow us to make a more general
statement about the recycling possibilities of these types of by-products in useful constructive
applications for the passive protection against fire; in some cases, the use of additives for
improving the mechanical properties of the products is advisable.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.097