The Use of FBC Ash for Preparation of Types of Hydraulic Binders Similar to Portland Cement

The reduction of greenhouse gases emissions is highly
discussed ecological theme at present. In addition to power industry
also main production sectors of binders, i.e. cement, air and hydraulic
lime are very sensitive to these questions. One of the possibilities
how CO2 emissions can be reduced directly at clinker burnout is
represented by partial substitution of lime with a material containing
limy ions at absence of carbonate group. Fluidised fly ash is one of
such potential raw materials where CaO can be found free and also
bound in anhydrite, CaSO4. At application of FBC (fluidized bed
combustion) fly ash with approximate 20% CaO content and its
dosing ratio to high percent lime 1:2, corresponding stechiometrically
to the preparation of raw material powder, approximately 0,37 t CO2
per 1 ton of one-component cement would be released at clinker
burnout compared to 0,46 t CO2 when orthodox raw materials are
used. The reduction of CO2 emissions thus could reach even 20%.

• Karel Dvořák
• Karel Kulísek
• Radek Magrla

• FBC ash
• cement
• hydraulic binders.

[1] García-Díaz, J.G. Palomo, F. Puertas,:Belite cements obtained from
ceramic wastes and the mineral pair. CaF2/CaSO4, Cem. Concr. Comp.
33-10 (2011).
[2] Singh M, Upadhayay SN, Prasad PM,: Preparation of special cements
from red mud. Waste Manag ;16:665–70. (1996)
[3] Ozturk, A.; Suyadal, Y.; Oguz, H.,: The formation of belite phase by
using phosphogypsum and oil shale, Cement and Concrete Research, 30
967-971 (2000)
[4] Raupp-Pereira F., James Ball R., Rocha J., Labrincha J.A., Allen G.:
"New based clinkers: belite and lime formulations" Cement and
Concrete Research. 38, 511 (2008).
[5] Singh M, Upadhayay SN, Prasad PM.: Preparation of special cements
from red mud. Waste Manag;16:665–70.(1996)
[6] Zapata A, Bosch P. A combustion method to synthesize a belite cement
clinker. J Am Ceram Soc ;93:987–92. (2010)
[7] Meyer, C., Baxter, S.: Use of recycled glass and fly ash for precast
concrete, Final Report to New York State Energy Research and
Development Authority, Rep. 98–18, Albany, NY, Oct. 1998
[8] Poon, C.S., Kou, S.C., Lam, L., Lin, Z.S., Activation of Fly Ash/Cement
Systems Using Calcium Sulfate Anhydrite (CaSO4), Cement and
Concret Research
[9] GAZDIČ, D.; Slag-Sulphate Binder Preparation. Advanced Materials
Research. 2013. 2013(818). p. 68 - 71. ISSN 1022-6680
[10] Keppert, M., Reiterman, P., Pavlík, Z., Pavlíková, M., Jerman, M.
Černý, R.: Municipal solid waste incineration ashes and their potential
for partial replacement of Portland cement and fine aggregates in
concrete. Cement WapnoBeton. 2010, vol. 15/77, no. 4, p. 187-193.
ISSN 1425-8129.