Accuracy and precision of phase analysis in portland cement by Bogue, microscopic and X-ray diffraction methods

• Published in: Cement and concrete research 1982-01, Vol.12 (3), p.381-398
• Main Author: Aldridge, L.P.
• Format: Article
• Language: English
• ISSN: 0008-8846; 1873-3948
• DOI: 10.1016/0008-8846(82)90087-4

From the results of an inter-laboratory study the magnitude of the between and within laboratory errors were determined for the analysis of portland cement and clinker by the Bogue, microscopic and X-ray diffraction methods. Neither the Bogue nor X-ray diffraction methods gave accurate analyses of the cement. The Bogue method suffers from systematic errors and it appears that the incorporation of MgO into the alite phase is the major cause of error in the Bogue analysis. X-ray diffraction analyses were, with one exception inaccurate. Microscopic analyses could only be performed on cement clinker which was subject to a large sampling error. It is concluded that, at the moment, the Bogue method is the most suitable for specifying the composition of portland cement. Na nga whakaaturanga i hua ake i nga rapunga maramatanga ka mohiotia nga wahi e hapa ana o nga kaupapa whaaki i te ahua o te iho o nga raima Portland, ara, nga kaupapa a Bogue, whakaahua ma te maikorowha; whakatiaho, whakapapaa ma nga hihi X-Ray. Ahakoa whakamatauria i raro i ta Bogue kaupapa, i raro ranei i nga tikanga o te X-Ray, kaore ke e tino tika ana e tino hangai ana ranei. Ano nei ko te wahi kaore e tino tika rawa ana o ta Bogue kaupapa kei te whakahanumitanga atu i te MgO ki roto i te raima i te wa e hapa ai nga tikanga X-Ray. Ko nga tikanga whakaahua ma te Maikorowha kei tona ahua ano. Heoi ano ra, ko te whakatau o tenei wa kei tenei na; ko ta Bogue ke te tino kaupapa hei tautokotanga mo nga tikanga hei whaaki i te ahua o te iho o te raima Portland.