UTILISATION OF CEMENT KILN DUST FOR THE ACTIVATION OF FLY ASH IN LOW STRENGTH APPLICATIONS

Author(s): H. Beltagui, M. Sonebi, K. Maguire, S. Taylor
Paper category: Proceedings
Book title: Proceedings of the 2nd International Conference
on Bio-Based Building Materials
Editor(s): Sofiane AMZIANE, Mohammed SONEBI and Karine CHARLET
ISBN:
e-ISBN: 978-2-35158-192-6
Publisher: RILEM Publications SARL
Publication year: 2017
Pages: 569-573
Total Pages: 4
Language : English

Abstract: Cement kiln dust (CKD) is a by-product of the cement manufacturing process, the composition of
which can vary widely. Recent years of using alternative fuels have resulted in higher chloride
and alkali contents within CKDs; as such, this limits the applications in which CKDs can be
utilised. Due to the high alkalinity of CKDs, they can potentially be utilised in the activation of
pulverized fuel ash (PFA) for low strength un-reinforced applications. The potential reactivity of a
CKD can be estimated from its composition; mainly, that which contains higher free-lime content
will be more reactive than that containing higher unreactive calcium carbonate content. This
study focuses on the hydration kinetics and mechanical properties of a CKD with 29.5% free lime
blended in various proportions with PFA and Portland cement. Paste samples using a water to
binder ratio of 0.35 were cast in 40 x 40 x 160 mm moulds, and the resulting compressive
strengths measured at 28 and 56 days. The hydration products at 56 days were investigated by
X-ray diffraction and thermogravimetric analysis. The results show that the CKD, containing high
free-lime content, has the potential to activate PFA and provide sufficient mechanical properties
for low strength applications.

Online publication :2017
Publication type :full_text
Public price (Euros) : 0.00