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Iowa State University--Becoming the Best

Development of Non-Clinker Cement for Environmental Hazard Reduction Using Cement Kiln Dust and Fly Ash


Principal investigators:

Project status


Start date: 01/01/01
End date: 12/31/02


Sponsor(s): Northwestern University

About the research

Abstract: The use of cement kiln dust (CKD) and Class F fly ash for a new cementitious material would significantly help in reduction of waste material disposal and greenhouse gas (carbon dioxide, CO2) emission from production of ordinary portland cement. As part of the investigation into the use of these two materials (NSF Project CMS-0086819), this research project was conducted to study the effects of chemical and thermal activations on hydration, strength development, and chemical properties of a CKD-fly ash system. In the experimental study, different CKD-to-fly ash ratios (50:50 and 75:25) and amount of NaOH (0, 2, and 5%) or OPC (0 and 10%) addition were selected to provide chemical activation on the binder hydration, especially the fly ash hydration. Three curing temperatures--24, 38, and 50 ?C--were employed for investigating effects of thermal activation. The chemical and physical characteristics of the raw materials were evaluated. The strength of CKD-fly ash pastes was tested. The hydration products of the binders were examined by thermogravimetric analysis and x-ray diffraction tests at different ages. The soluble alkali and chloride contents as well as pH values of the pastes were measured to provide insight on the binder durability.