Monitoring The Drying And Grinding Process During Production Of Celitement Through A Nir-Spectroscopy Based Approach (original) (raw)
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2012
A series of 30 clinker samples were collected over a period of production time. Microscopy measurements were carried out in parallel on the 30 samples to obtain quantitative data for C3S, C2S, C3A and C4AF phases. A set of samples were then selected with a view to getting a reasonable dynamic range (working range) for concentrations of the four clinker phases. These clinker granules were ground and pressed into pellets before being measured by the ARL 9900 Series Total Cement Analyzer.
Structurally distinguishable phases of the substances present in four hydraulic (Portland) cement samples and in one white cement sample manufactured in India, were identified from their respective XRD diagrams and subsequently quantitatively analyzed using quantitative phase analysis program based on Rietveld refine ment (Bish and Howard, 1988). Phases present in all the hydraulic cement samples are tricalcium silicate (Alite and Haturite, C3S), dicalcium silicate (Larnite, C2S), brownmillerite, both orthorhombic and monoclinic phases (tetracalcium aluminoferrate, C4AF) and tricalcium aluminate (C3A). A small amount of gypsum, periclase, bassenite and other minerals were also found to be present in four Portland clinkers, while a sizeable chunk of calcium silicate hydrate gel (CAHG) was found to be present in three samples. In the white cement, as expected, neither form of brownmillerites were detected. Credibility, merits and demerits of the method used were discussed.
Chemical Analysis of Available Portland Cement in Libyan Market Using X-Ray Fluorescence
This study compares the quality of different brands of Portland Cement (PC) available in Libyan market. The amounts of chemical constituents like SiO2, Al2O3, Fe2O3, CaO, MgO, SO3 and Lime Saturation Factor (LSF) were determined in accordance with Libyan (L.S.S) and Amrican (A.S.S) Standard Specifications. All the cement studies were found to be good for concrete work especially where no special property is required. The chemical and mineralogical analyses for studied clinker samples show that thedominant phases composition are C3S and C2S while the C3A andC4AF are less abundant.
Global cement and raw materials fusion/XRF analytical solution. II
Powder Diffraction, 2011
A previous paper portrayed sample preparation by fusion methodology and the XRF analysis conditions for the calibration of cement materials [Bouchard et al., 2009. “Global cement and raw materials fusion/XRF analytical solution,” Adv. X-Ray Anal. 53, 263–279]. The results of two well known cement chemical analysis Standard Methods were also presented. These results proved that this robust analytical method is able to qualify by the ASTM C114 [ASTM C114-08 (2008). “Standard test methods for chemical analysis of hydraulic cement,” Annual Book of ASTM Standards Vol. 04.01 (ASTM International, West Conshohocken, PA), pp. 150–157)] and ISO/DIS 29581-2 [Draft Standard, 2007-07 (2007). “Methods of testing cement—Chemical analysis of cement—Part 2: Analysis by X-ray fluorescence” ISO/DIS 29581-2, 2007, pp. 1–30]. This robust analytical method was developed using an automated fusion instrument for the sample preparation and a WDXRF spectrometer for the determination of all elements of intere...