Ageing of oilfield cement at high humidity: a combined FEG-ESEM and Raman microscopic investigation

Deng, Changsheng; Breen, Chris; Yarwood, J.; Habesch, S. M.; Phipps, Jonathan; Craster, Bernadette; Maitland, Geoffrey C.

doi:10.1039/b203127m

Cited by 75 publications

(56 citation statements)

References 27 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In previous works, several consequences of pre-hydration for the chemical and engineering properties of cement have been reported. These include: increased setting time, decreased compressive strength and heat of hydration, altered rheological properties and poor response to superplasticiser addition (Deng et al, 2002;Maltese et al, 2007;Schmidt et al, 2007;Sylla, 1975;Theisen and Johansen, 1975;Whittaker et al, 2013;Winnefeld, 2008).…”

Section: Introductionmentioning

confidence: 99%

Impact of environmental moisture on C₃A polymorphs in the absence and presence of CaSO₄ · 0·5 H₂O

Dubina

Plank

Black

et al. 2014

Advances in Cement Research

View full text Add to dashboard Cite

The phenomenon of water vapour sorption by anhydrous C 3 A polymorphs both in the absence and in the presence of CaSO 4 . 0 . 5 H 2 O was studied utilising dynamic and static sorption methods. It was found that orthorhombic C 3 A starts to sorb water at 55% relative humidity (RH) and cubic C 3 A at 80% RH. Also, C 3 A o sorbs a higher amount of water which is predominantly physically bound, whereas C 3 A c preferentially interacts with water by chemical reaction. In the presence of calcium sulfate hemihydrate, ettringite was observed as the predominant pre-hydration product for both C 3 A modifications: that is, ion transport had occurred between C 3 A and sulfate. Environmental scanning electron microscopic imaging revealed that in a moist atmosphere, a liquid water film condenses on the surface of the phases as a consequence of capillary condensation between the particles. C 3 A and sulfate can then dissolve and react with each other. Seemingly, pre-hydration is mainly facilitated through capillary condensation and less through surface interaction with gaseous water molecules. Notation

show abstract

Section: Introductionmentioning

confidence: 99%

Impact of environmental moisture on C₃A polymorphs in the absence and presence of CaSO₄ · 0·5 H₂O

Dubina

Plank

Black

et al. 2014

Advances in Cement Research

View full text Add to dashboard Cite

show abstract

“…The similar assignment was also drawn in the paper written by Sahu et al (2002). Raman studies on sulfate attack were also carried out by several other authors (Deng et al, 2002;Renaudin et al, 2007;Gatta et al, 2012). The findings by these researches were consistent with those of Brough and Atkinson (2001) and Sahu et al (2002).…”

Section: Sulfate Attack and Carbonationsupporting

confidence: 78%

Early-age hydration studies of Portland cement

Liu¹

View full text Add to dashboard Cite

“…Some minerals such as calcium sulfate, quartz, calcium carbonate and mica were identified, and bands from matrix materials (e.g. cement) 21 were observed. Seven non-asbestos materials were analysed and the absence of asbestos from all of them was successfully confirmed by Raman spectroscopy.…”

Section: Non-asbestos Materialsmentioning

confidence: 99%

Use of a fibre‐optic probe for the identification of asbestos fibres in bulk materials by Raman spectroscopy

Bard

Tylee

Williams

et al. 2004

J Raman Spectroscopy

View full text Add to dashboard Cite

Within the UK, a large number of surveys are being carried out for the identification of asbestos in building materials. Pre-demolition or major refurbishment and building sampling surveys require that representative samples be analysed for asbestos. The primary technique for the analysis of asbestos fibres in bulk materials is polarized light microscopy (PLM). Since this method is based on visual estimation, it depends on the competence and experience of the analyst. Furthermore, PLM, in common with the other analytical methods used for the identification of asbestos in bulk materials, is a laboratory-based technique requiring samples to be collected and then sent to a laboratory for analysis. Raman spectroscopy is a powerful tool for mineral characterization and provides a molecular fingerprint for material. In recent years, new developments in optics and electronics have permitted the development of compact Raman spectrometers allowing in situ measurements. We report the performance of a robust, laboratory-based fibre-optic probe for the identification of asbestos in bulk materials by Raman spectroscopy. Thirty-eight samples were analysed, and the results showed that 95% of the samples were successfully identified as either asbestos free or containing one or more asbestos components. A success rate of 100% was found for asbestos insulating board and asbestos cement materials. The results indicated that a Raman probe device for detecting asbestos does have potential, but a number of issues need to be addressed before an on-site system can be developed.

show abstract

Ageing of oilfield cement at high humidity: a combined FEG-ESEM and Raman microscopic investigation

Cited by 75 publications

References 27 publications

Impact of environmental moisture on C₃A polymorphs in the absence and presence of CaSO₄ · 0·5 H₂O

Impact of environmental moisture on C₃A polymorphs in the absence and presence of CaSO₄ · 0·5 H₂O

Early-age hydration studies of Portland cement

Use of a fibre‐optic probe for the identification of asbestos fibres in bulk materials by Raman spectroscopy

Contact Info

Product

Resources

About

Ageing of oilfield cement at high humidity: a combined FEG-ESEM and Raman microscopic investigation

Cited by 75 publications

References 27 publications

Impact of environmental moisture on C3A polymorphs in the absence and presence of CaSO4 · 0·5 H2O

Impact of environmental moisture on C3A polymorphs in the absence and presence of CaSO4 · 0·5 H2O

Early-age hydration studies of Portland cement

Use of a fibre‐optic probe for the identification of asbestos fibres in bulk materials by Raman spectroscopy

Contact Info

Product

Resources

About

Impact of environmental moisture on C₃A polymorphs in the absence and presence of CaSO₄ · 0·5 H₂O

Impact of environmental moisture on C₃A polymorphs in the absence and presence of CaSO₄ · 0·5 H₂O