CEMENT

[:ru]Херманн Е.[:en]Herrmann, J.[:] [:ru]магистр технических наук, дипломированный инженер, Научно-исследовательский институт цементной промышленности, Дюссельдорф, Германия[:en]M. Eng. Dipl.‑Ing., VDZ-gGmbH Research Institute of the Cement Industry, Duesseldorf, Germany[:]

[:ru]Рикерт Й.[:en]Rickert, J.[:] [:ru]доктор технических наук, Научно-исследовательский институт цементной промышленности, Дюссельдорф, Германия[:en]Dr.‑Ing., VDZ-gGmbH Research Institute of the Cement Industry, Duesseldorf, Germany[:]

Alitinform №2-3 (43) 2016 г. 14-25 p.

Abstract

Influences of the particle size distribution of siliceous fly ash with readily-soluble sulfate-containing surface coatings, and of residual coke on rheological properties of fly ash cement paste and on cement’s interactions with superplasticizers based on polycarboxylate ether (PCE) were determined using rheological measurements, zeta potential experiments, and pore solution analyses. The adjustment of the particle size distributions of fly ash and clinker to the cement resulted in a softer consistency of the cement paste and so, in a reduced superplasticizer demand. The readily soluble sulphate-containing surface coatings of the fly ash particles contributed to the sulphate ion concentration of the pore solution and consequently, influenced the mode of action of the superplasticizer.

Key words:

fly-ash cement, particle size distribution, rheology, sulphate, superplasticizer