DETERMINATION OF CO2 IN CEMENTS BY X-RAY-DIFFRACTION

Citation
R. Beilmann et al., DETERMINATION OF CO2 IN CEMENTS BY X-RAY-DIFFRACTION, ZKG INTERNATIONAL, 49(7), 1996, pp. 400-406
Citations number
5
Categorie Soggetti
Construcion & Building Technology
Journal title
ISSN journal
09490205
Volume
49
Issue
7
Year of publication
1996
Pages
400 - 406
Database
ISI
SICI code
0949-0205(1996)49:7<400:DOCICB>2.0.ZU;2-D
Abstract
Not only are cement clinker and gypsum used in the production of cemen t, but in many cases limestone is also added as an interground additiv e. The CO2 content, which originates almost entirely from the CaCO3 co ntent of the limestone, is used as the control variable for the metere d addition of limestone during cement grinding. At present special car bon analyzers are generally used for determining the CO2 content of th e cement. However, incorporating this equipment in an automated labora tory is technically complicated and therefore also very cost-intensive . A technically problem-free and more economical method for the determ ination of CO2 is X-ray diffraction. X-ray diffraction analyzers are n ow established items of equipment in every automated laboratory. The C O2 content in cement is determined indirectly by measuring the X-ray d iffraction intensity of a chosen CaCO3 peak. The diffraction intensiti es are directly proportional to the CO2 contents. The results of inves tigations carried out show that a measurement accuracy of significantl y better than +/- 0.1 % can be achieved by X-ray diffraction.