On the dissolution of the interstitial phases in Portland cement

Gutteridge, W. A.

doi:10.1016/0008-8846(79)90124-8

Cited by 91 publications

(40 citation statements)

References 1 publication

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…More detailed descriptions of such extraction methods can be found in the literature, including selective extractions to produce a residue enriched in belite [11,17].…”

Section: Salicylic Acid and Methanol Extractionmentioning

confidence: 99%

Phase Analysis of Portland Cement by Combined Quantitative X-Ray Powder Diffraction and Scanning Electron Microscopy

Stutzman

Pan

Bullard

2016

J. RES. NATL. INST. STAN.

View full text Add to dashboard Cite

pan.feng@nist.gov jeffrey.bullard@nist.gov X-ray powder diffraction (XRD) has been used for several decades to identify and measure the mass fractions of various crystalline phases in portland cement. More recently, a combination of scanning electron microscopy with X-ray microanalysis (SEM/XMA) and image processing has been shown to enable the quantitative characterization of microstructural features in these materials. Each technique can furnish some information that is not accessible from the other. For example, SEM/XMA can identify the microstructural location and morphology of calcium sulfate minerals, while only XRD can determine the relative abundance of the different forms of calcium sulfate, such as gypsum (CaSO4 · 2H2O), bassanite (CaSO4 · 1 2 H2O), and anhydrite (CaSO4). This document describes how XRD and SEM/XMA can be used together to establish and validate the portland cement phase composition and microstructure. Particular emphasis is laid on step-by-step procedures and best practices for XRD specimen preparation, data collection, and intepretation. Similar detail has been given recently for SEM/XMA [Stutzman et al., NIST Tech Note 1877, U.S. Department of Commerce, April 2015]. The methods are demonstrated for three portland cement powders, through which apparent discrepancies between the results of the two methods are identified and procedures are described for resolving the discrepancies and quantifying uncertainty.

show abstract

“…More detailed descriptions of such extraction methods can be found in the literature, including selective extractions to produce a residue enriched in belite [11,17].…”

Section: Salicylic Acid and Methanol Extractionmentioning

confidence: 99%

Phase Analysis of Portland Cement by Combined Quantitative X-Ray Powder Diffraction and Scanning Electron Microscopy

Stutzman

Pan

Bullard

2016

J. RES. NATL. INST. STAN.

View full text Add to dashboard Cite

show abstract

“…salicílico. Respecto a las condiciones indicadas en la bibliografía (4,5) en los ensayos llevados a cabo se modificó la cantidad de muestra a separar, el tiempo de reacción y la cantidad de reactivos utilizados. …”

Section: Resultados Y Discusiónunclassified

“…The sample size to be separated, reaction time and amount of reagents used in the tests conducted differed from the conditions specified in the literature (4,5). After the two separation methods were optimized, these treatments Una vez optimizados ambos métodos de separación, estos tratamientos se aplicaron sobre los clínkeres obtenidos a partir de la adición al crudo del 0,5% y 2% de ZnO, ZrO 2 y B 2 O 3 .…”

Section: Resultsunclassified

See 1 more Smart Citation

Efecto del ZnO, ZrO2 y B2O3 en el proceso de clinkerización. Parte II. Metodología de separación de fases y distribución en las fases del clínker

García‐Díaz¹,

Puertas²,

Gazulla³

et al. 2009

Mater. construcc.

View full text Add to dashboard Cite

SUMMARYThis study is a continuation of previous research which established the effect of the oxides ZnO, ZrO 2 and B 2 O 3 , both separately and jointly, on clinkerization processes, as well as on clinker phase composition and morphology. A knowledge of the distribution of these elements in mineral phases is requisite to understanding which phases they affect and how. The present study aimed, then, to develop a suitable methodology for the selective separation of clinker phases and to ascertain how ZnO, ZrO 2 and B 2 O 3 are distributed in these phases when added to the raw mix in proportions of up to 2%. The optimal conditions for separating clinker phases with selective solutions (KOH-sucrose and CH 3 OHsalicylic acid) were established. These selective treatments proved to be insufficient in and of themselves to determine the distribution of ZnO and ZrO 2 in the clinker phases. Consequently, the original clinkers had to be analyzed with SEM/BSE/EDX techniques to complete the study. The findings showed that ZnO and ZrO 2 were fixed primarily in the C 3 A and C 4 AF present in the clinker, while B 2 O 3 was taken up by the silicate phases.K K e e y y w w o o r r d d s s : : Portland cement clinker, ZnO, ZrO 2 , B 2 O 3 , separation methods.(

show abstract

“…Conjugando um ataque com ácido salicílico e metanol é possível enriquecer o resíduo em belita (Gutteridge, 1979).…”

Section: Dissolução Seletivaunclassified

Aplicação da difração de raios-X e método de Rietveld no estudo de Cimento Portland

Gobbo¹

View full text Add to dashboard Cite

CAPÍTULO III -DIFRAÇÃO DE RAIOS-X E O MÉTODO DE RIETVELD AbstractThe project has focused on the application of X-ray diffraction and Rietveld method (XRDRietveld) on the characterization and quantification of Portland cement, and represents a pioneer scientific contribution on the theme in Brazil.Natural and artificial pozzolans, and also industrial byproducts that are highly available in the Brazilian industry were studied, as the blast furnace slags from steel works and fly ash from power stations. Furthermore components of laboratorial cements were studied, as clinker, limestone, gypsum, and finally the Portland cement with additions, prepared in laboratory.Hydration studies to follow the reactions in a cement paste were also performed using XRDRietveld.The Portland cement is composed by clinker, gypsum and fillers, as limestone, pozzolan and slags. Portland cement clinker is the sintered and pelletized product from calcination of an adequate mix of limestone and clay and minor corrective materials.The Rietveld method was introduced by Hugo Rietveld in 1969 and is based on the simulation of the whole diffraction spectrum from the components structural data, allowing for refining instrumental and crystallographic parameters. Quantitative values are obtained by comparing the calculated and actual diffractograms and minimizing differences mathematically through a least squares method. To develop the project several analytical traditional techniques were used with XRD: optical microscopy, electronic microscopic (SEM), X-ray fluorescence (XRF) and calorimeter.XRD-Rietveld presented as a high reproducibility technique with technical and logistics advantages. The evaluation of the instrumental conditions showed that to obtain a good quantitative result in reduced time were with a scan with 20s/step, a 10 minutes scan, possible with position sensitive detectors. Automatic (ADS) and fixed divergent slits (FDS) were tested, validating the technique in both conditions. The reduction in the time of analysis is very important to follow the cement industry interests on quality control. Para desenvolvimento do projeto foram utilizadas técnicas analíticas tradicionais como apoio, tais como a microscopia óptica de luz transmitida, microscopia eletrônica de varredura (MEV-EDS) e fluorescência de raios-X (FRX). Histórico do Cimento Portland CompostoA primeira referência a pozolanas é encontrada em Da Architetura, uma das mais antigas edições existentes do tratado de arquitetura escrito pelo romano Marcus "Vitruvius" Pollio (séc. As escórias de alto-forno foram aplicadas pela primeira vez na Alemanha em 1853. Na maioria dos países do mundo, elas são incorporadas como ingrediente dos cimentos Portland de altoforno contendo entre 25 e 70% em massa de escória. Percebeu-se que a cinza volante enriquecida em cálcio, produzida pela combustão de carvão sub-betuminoso e lignítico é mineralogicamente similar à escória granulada de alto-forno (Malhotra e Mehta, 1996). Um constituinte predominante de ambos é um vidro alumino-silicático enr...

show abstract

On the dissolution of the interstitial phases in Portland cement

Cited by 91 publications

References 1 publication

Phase Analysis of Portland Cement by Combined Quantitative X-Ray Powder Diffraction and Scanning Electron Microscopy

Phase Analysis of Portland Cement by Combined Quantitative X-Ray Powder Diffraction and Scanning Electron Microscopy

Efecto del ZnO, ZrO<sub>2</sub> y B<sub>2</sub>O<sub>3</sub> en el proceso de clinkerización. Parte II. Metodología de separación de fases y distribución en las fases del clínker

Aplicação da difração de raios-X e método de Rietveld no estudo de Cimento Portland

Contact Info

Product

Resources

About