Reusing of Spent FCC Catalyst as a Very Reactive Pozzolanic Material: Formulation of High Performance Concretes

Title: Reusing of Spent FCC Catalyst as a Very Reactive Pozzolanic Material: Formulation of High Performance Concretes
Author(s): Monzó
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: 1008 - 1016
Total Pages: 9
Nb references: 14
Language: English

Abstract: In this paper, the pozzolanic reactivity of the spent fluid catalytic cracking
(FCC)catalyst, when this is used in hydraulic binders, has been studied. Reactivity
behaviour for FCC-cement systems has been monitored by the determination of lime
fixation rate using thermal analysis techniques and by compressive strength
development studies on FCC containing mortars. The presence of FCC in Portland
cement systems with low water/binder ratio enhanced the mechanical properties of
mortars due to the important portlandite fixation degree. Selected interesting data on
FCC reactivity and compressive strength (Rc) behavior for FCC-concrete are described
and analyzed. Replacement of cement by FCC and addition of FCC yielded
Rc>100MPa concrete for 28 days curing time, that is, more than 20% in compressive
strength than control concrete. Additionally, some cement mixtures containing FCC and
fly ashes were evaluated, in order to obtain information about the synergism between
both pozzolans in the hydration process for systems with low water/binder ratio. For
low water/binder ratio, the role of FA at early ages was to increase the hydration degree
of cement particles, whereas FCC act as a very reactive pozzolan in cement/FA/FCC
mixtures.

Online publication: 2004-09-29
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143756.111