Diffraction investigations of cement clinker and tricalcium silicate using Rietveld analysis

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dc.contributor Peterson, Vanessa Kate en_AU
dc.date.accessioned 2007-03-14T01:53:28Z
dc.date.accessioned 2012-12-15T03:53:25Z
dc.date.available 2007-03-14T01:53:28Z
dc.date.available 2012-12-15T03:53:25Z
dc.date.issued 2003
dc.identifier.uri http://hdl.handle.net/2100/328
dc.identifier.uri http://hdl.handle.net/10453/20345
dc.description University of Technology, Sydney. Department of Chemistry, Materials & Forensic Sciences.
dc.description.abstract Cement is the world's most popular building material, yet surprisingly its composition is not fully understood. Due to the complex nature of cement constituents, there is currently no reliable method to quantitatively determine the composition of cement. Partly this arises from the fact that the crystal structure of the main component of cement, tricalcium silicate, has not been fully determined. There has been an increase in the use of Rietveld refinement of powder diffraction data for the analysis of cement in recent years. The method has emerged as a valuable tool for the quantitative determination of the composition of cement. A further advantage of the method is its ability to refine complex crystal structures, such as tricalcium silicate. Despite the increased application of this method, few publications exist concerning the evaluation or improvement of the method for the purpose of cement analysis. In this work, the Rietveld method has been critically investigated as a tool for the identification and quantification of the different phases in cement clinker. Laboratory X-ray, synchrotron, neutron, and combined diffraction data are all used in the investigations. For the first time, comparisons of analysis results using various sources are made, rather than comparing the results from various methods. Inconsistencies in the results were found, and their causes were investigated and identified. The reliability of this method was shown to be dependent on the quality of the diffraction data, both in terms of the counting statistics and the resolution, and on the ability of the structures used in the Rietveld model to describe the phases in the sample. The only previously existing structural model for triclinic tricalcium silicate is shown, in this work, inadequate as a description of the form found in cement. Consequently, the triclinic crystal structures of tricalcium silicate were re-investigated. Using synchrotron powder diffraction data, the lattice dynamics during the T1-T2 transition were observed in detail for the first time. Superstructure reflections were observed for the two structures. The first model for the average sub-structure of the T2 form is presented. Structural modulation in the T1 form was re-investigated. The parent sub-structure, suitable for Rietveld refinement, corresponding modulation wave-vector, and superspace group of the superstructure, were identified. en_AU
dc.format.extent 596102 bytes
dc.format.extent 1934229 bytes
dc.format.extent 2495934 bytes
dc.format.mimetype application/pdf
dc.language en en_AU
dc.language.iso en_AU
dc.rights http://www.lib.uts.edu.au/disclaimer.html en_AU
dc.rights Copyright Vanessa K Peterson en_AU
dc.subject Cement composites. en_AU
dc.subject Cement clinkers. en_AU
dc.title Diffraction investigations of cement clinker and tricalcium silicate using Rietveld analysis en_AU
dc.type Thesis (PhD) en_AU
utslib.copyright.status Open Access

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