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Spectroscopy I Polymers, Compo '*es and Spectroscopy I Sheffield Hallam-University Page 1 of 2 <br /> Horne University Sheffield Courses Research Business Contact <br /> Sham ❑printable <br /> FfeYm Unlygf811y version <br /> ❑e-mail to a <br /> SfrAMEN8 YOUR THNMG friend <br /> Polymers, Composites 40 <br /> "� �^7� [^t PrtATERIA Z AND ENGINEERING <br /> andSpectroscopy <br /> (PCAS) RESEARCHIN"TUTE <br /> F Home IN Spectroscopy • Raman Spectroscopy of cement <br /> 0 Polymers <br /> 10 Composites Raman Spectroscopy of cement: <br /> P Spectroscopy <br /> P Projects 4. Class G oilwell cement <br /> i Techniques <br /> Oilwell cement is specially formulated for the extreme <br /> 1¢ Staff Profiles conditions required, i.e. high temperatures and <br /> 0 Contact us pressures. It typically contains low quantities of C3A <br /> and free lime (CaO). Understanding the early stages of <br /> oilwell cement hydration is crucial to its application. <br /> Raman microscopy combines the spectroscopic <br /> capability with high spatial resolution, allowing us to <br /> study hydration processes in-situ. Figure 6 shows a <br /> Raman spectrum obtained from a fresh class G cement <br /> powder and from a paste hydrated for 1 day. <br /> Figure 6 (Click on <br /> image to enlarge): <br /> Raman spectra of fresh <br /> class G oilwell cement <br /> and a paste hydrated for <br /> 1 day. <br /> " Environmental scanning <br /> Electron Microscopy is <br /> also very well suited for <br /> examination of these <br /> ,J kinds of materials, <br /> allowing analysis <br /> without the necessary <br /> application of a <br /> conductive coating. Figure 7 shows a feature ((a), <br /> micrograph, and (b) its corresponding EDX mapping) on <br /> the surface of an oilwell cement after hydration by <br /> water vapour for 3 months. The "star-like" feature was <br /> identified as ettringite. <br /> http://www.shu.ac.uk/research/meri/pcas/surfaces/surf projects2.4.httnl 2/6/2008 <br />