| INORGANIC MATERIALS AND CERAMIC MATRIX COMPOSITES |
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Quantitative Characterization for Phase Evolution of Cement Paste Based
on Rietveld/XRD (Internal Standard Method) and Correction Formula
for Amorphous Phase |
| ZHAO Piqi, LIANG Chen, SUN Chuankui, LIU Honghua, WANG Shoude, LU Lingchao
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| Shandong Provincial Key Laboratory of Preparation and Measurement of Building Materials, University of Jinan, Jinan 250022 |
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Abstract Based on Rietveld/XRD method, the quantitative characterization of the phase composition for ordinary Portland cement paste at a given hydration was investigated via GSAS-EXPGUI software, and the reliability of the quantitative results was further probed by combining with the thermal analysis of Ca(OH)2, as well as the quantitative matching relationship of clinker minerals and free water. The results indicated that the Rietveld quantitative results of Ca(OH)2 in dry hydration samples agreed well with that of the thermal analysis, their absolute errors were 1.2%,0.7%,0.3% and 0.8% when hydrated for 1 d, 3 d, 7 d and 28 d ages, respectively. Besides, the relative errors were significantly decreased with the increase of hydration age. It was found that there was a satisfactory linear correlation (correlation coefficient R2=0.996) between the degree of consumption of clinker minerals and free water, reflecting the high reliability of Rietveld quantitative characterization. In this process, an ameliorated amorphous phase quantitative formula based on the internal standard method was proposed, and the mathematical relationship between the free water of cement paste and the chemical bonding water of corresponding drying samples was established.
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Published: 11 March 2019
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| Fund:This work was financially supported by the National Natural Science Foundation of China (51602126), China Postdoctoral Science Foundation (2017M622118), Postdoctoral/doctoral Foundation of University of Jinan (XBH1716/XBS1661), Science and Technology Project of University of Jinan (XKY1730). |
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2019, Vol. 33 
