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Pro035

Distribution of sulfates in Portland cement clinker



Title: Distribution of sulfates in Portland cement clinker
Author(s): D. Herfort
Paper category : conference
Book title: International RILEM Workshop on Internal Sulfate Attack and Delayed Ettringite Formation
Editor(s): K. Scrivener and J. Skalny
Print-ISBN: 2-912143-44-6
e-ISBN: 2912143802
Publisher: RILEM Publications SARL
Publication year: 2004
Pages: 18 - 27
Total Pages: 10
Nb references: 16
Language: English


Abstract: A method for predicting the distribution of SO3 between the sulfate and non-sulfate phases is presented. The method uses the phase rule and the phase diagram for the K2SO4-CaSO4 system to identify the range of temperature and composition across which the solid solution of sulfates in the silicate phases can increase as a function of increased sulfate content in the system. More specifically, it is predicted that the content of SO3 in the silicates will increase as a direct function of increasing SO3/K2O ratios, and that above the SO3/K2O ratio necessary for anhydrite formation, the concentration of SO3 in the silicates will remain constant. This model was tested on experimental data for both industrial and laboratory clinker and found to be essentially valid. The maximum possible content of SO3 in belite was found to be approximately 2 wt% in rapidly cooled laboratory clinker, and 1.5 wt% in industrial clinker.


Online publication: 2002-09-07
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143802.002