Use of the Beckman and Perkin-Elmer Flame Photometers for the Determination of Alkalies in Portland Cement

2009 ◽  
pp. 28-28-5
Author(s):  
JJ Diamond ◽  
L Bean
Keyword(s):  
Portland Cement

Calorimetric determination of the effect of additives on cement hydration process

2013 ◽  
Vol 67 (2) ◽  
Author(s):  
Pavel Šiler ◽  
Josef Krátký ◽  
Iva Kolářová ◽  
Jaromír Havlica ◽  
Jiří Brandštetr
Keyword(s):  
Portland Cement ◽  
Silica Fume ◽  
Maximum Temperature ◽  
Granulated Blast Furnace Slag ◽  
Mineral Components ◽  
Maximum Temperatures ◽  
The Impact ◽  
Furnace Slag ◽  
Calorimetric Determination

AbstractPossibilities of a multicell isoperibolic-semiadiabatic calorimeter application for the measurement of hydration heat and maximum temperature reached in mixtures of various compositions during their setting and early stages of hardening are presented. Measurements were aimed to determine the impact of selected components’ content on the course of ordinary Portland cement (OPC) hydration. The following components were selected for the determination of the hydration behaviour in mixtures: very finely ground granulated blast furnace slag (GBFS), silica fume (microsilica, SF), finely ground quartz sand (FGQ), and calcined bauxite (CB). A commercial polycarboxylate type superplasticizer was also added to the selected mixtures. All maximum temperatures measured for selected mineral components were lower than that reached for cement. The maximum temperature increased with the decreasing amount of components in the mixture for all components except for silica fume. For all components, except for CB, the values of total released heat were higher than those for pure Portland cement samples.

Possibilities of Processing of Slag Aggregate from Heap Koněv

2019 ◽  
Vol 292 ◽  
pp. 79-84
Author(s):  
Lukáš Procházka ◽  
Jana Boháčová
Keyword(s):  
Blast Furnace ◽  
Portland Cement ◽  
Mechanical Parameters ◽  
Durability Properties ◽  
Subsequent Determination ◽  
Alkali Activated

The aim of this work is to find out whether the slag aggregates from heap Koněv can be used in hydraulic mixtures based on traditional Portland cement as well as in alternative binders based on alkali activated blast furnace slag.In the experiment the basic physical-mechanical parameters of prepared mixtures were determined and the durability properties of these composites were verified. The composition of the aggregate extract and its influence on the properties of the prepared mixtures and the subsequent determination of the alkaline ions in slag aggregates were also verified.

Determination of amorphous phase levels in Portland cement clinker

2002 ◽  
Vol 17 (3) ◽  
pp. 178-185 ◽  
Author(s):  
Phe Man Suherman ◽  
Arie van Riessen ◽  
Brian O’Connor ◽  
Deyu Li ◽  
Dick Bolton ◽  
...  
Keyword(s):  
Portland Cement ◽  
Cement Clinker ◽  
Rietveld Refinements ◽  
Amorphous Component ◽  
X Ray ◽  
Absolute Phase ◽  
Portland Cement Clinker ◽  
External Phase ◽  
Long Time

The existence of glass or amorphous component in Portland cement clinker has been questioned for a long time. However, besides the crystalline phases, there are reports in the literature of noncrystalline material in cement clinker, which is considered to be the residue of the melt that has failed to crystallize. Absolute phase abundances were determined in this study by Rietveld refinements with laboratory X-ray data, using both internal and external phase composition standards. The results clearly demonstrate the existence of an amorphous component in Portland cement clinker. The presence of an amorphous component was also apparent from diffraction data for clinker from which the silicate phases had been chemically removed, using both laboratory X-ray and synchrotron radiation patterns.

Sample Preparation Optimization for EDXRF Analysis of Portland Cement

1988 ◽  
Vol 32 ◽  
pp. 221-226
Author(s):  
Wayne Watson ◽  
Jim Parker ◽  
Anthony R. Harding
Keyword(s):  
Sample Preparation ◽  
Portland Cement ◽  
Preparation Methods ◽  
X Ray ◽  
Accuracy And Precision ◽  
Edxrf Analysis ◽  
Analytical Accuracy ◽  
Minimum Detection Limits ◽  
Sample Preparation Methods

AbstractVarious sample preparation methods for Energy Dispersive X-ray Fluorescence (EDXRF) analysis of Portland cement were compared in order to evaluate improvement in analytical accuracy and precision. Sample preparation requirements for EDXRF are slightly different than for Wavelength Dispersive X-ray Fluorescence (WDXRF), and the methods commonly used in WDXRF are not optimized for EDXRF. Primarily, the work focuses on techniques for producing a fused sample with the lowest practical concentration of lithium borate flux. Determination of minimum detection limits were made from samples with varying proportions of flux in order to evaluate analytical optimization. Ease and reproducibility of preparation of the sample was also considered.

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