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              <image:loc>http://www.understanding-cement.com/images/allscreensaversmall.jpg</image:loc>
              <image:caption>horizontal strip of four small images that can be downloaded as screensaver/desktop images</image:caption>
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              <image:caption>photo of nick winter</image:caption>
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            <lastmod>2011-01-31T14:53:45-05:00</lastmod>
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              <image:caption>Picture of aggregate particle with extruding alkali-silica gel</image:caption>
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              <image:caption>Detail of aggregate showing alkali-silica gel extruded into cracks within the concrete. Ettringite is also present within some cracks.</image:caption>
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              <image:caption>long vertical green wiggly arrow pointing down</image:caption>
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              <image:caption>Scanning electron microscope image of chert aggregate particle with numerous internal cracks due to asr; cracks extend into the adjacent concrete</image:caption>
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              <image:caption>Same image as previous, with X-ray spectra superimposed showing how alkali-silica gel composition changes with time to become more like the surrounding calcium silicate hydrates</image:caption>
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            <loc>http://www.understanding-cement.com/asr_and_glass.html</loc>
            <lastmod>2011-12-21T08:38:08-05:00</lastmod>
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              <image:caption>Photo of cracked glass tube.</image:caption>
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              <image:caption>SEM image of crack in glass tube wall, containing alkali silicate gel.</image:caption>
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              <image:caption>image of e-book</image:caption>
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            <image:image>
              <image:loc>http://www.understanding-cement.com/images/detail_paste_and_glass.jpg</image:loc>
              <image:caption>Cement paste and cracked glass, with adhering gel on glass surface.</image:caption>
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              <image:loc>http://www.understanding-cement.com/images/general_view_of_paste_and_glass.jpg</image:loc>
              <image:caption>SEM image of paste and cracked glass.</image:caption>
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              <image:caption>X-ray spectrum of gel in crack, showing strong peaks due to calcium, potassium and silicon, and a weaker peak due to sodium.</image:caption>
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            <loc>http://www.understanding-cement.com/autoclaved-aerated-concrete.html</loc>
            <lastmod>2010-08-23T08:01:36-04:00</lastmod>
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              <image:loc>http://www.understanding-cement.com/images/cemlimesand.jpg</image:loc>
              <image:caption>Picture of detail of polished section of block made with cement, lime and sand showing hydration product and residual sand particles</image:caption>
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              <image:caption>Green cake being cut by fine wires</image:caption>
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              <image:loc>http://www.understanding-cement.com/images/aircreterise.jpg</image:loc>
              <image:caption>Green cake rising in mould</image:caption>
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              <image:loc>http://www.understanding-cement.com/images/aircretepour.jpg</image:loc>
              <image:caption>Slurry being poured into moulds</image:caption>
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              <image:loc>http://www.understanding-cement.com/images/autoclave.jpg</image:loc>
              <image:caption>Green blocks being loaded into an autoclave</image:caption>
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              <image:caption>Lime plus 
silica produces tobermorite</image:caption>
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              <image:loc>http://www.understanding-cement.com/images/aircreteblock.jpg</image:loc>
              <image:caption>Typical autoclaved aerated concrete block, cut to show internal pore structure</image:caption>
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              <image:caption>Detail showing cellular aircrete pore structure</image:caption>
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            <lastmod>2010-05-28T12:51:20-04:00</lastmod>
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              <image:caption>cement powder together with clinker nodules</image:caption>
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            <lastmod>2010-07-22T16:49:50-04:00</lastmod>
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              <image:loc>http://www.understanding-cement.com/images/ppslab.jpg</image:loc>
              <image:caption>Phenolphthalein indicator applied to a fresh fracture surface of a concrete slab has turned purple at the centre but not within 5mm of the top surface and 7mm of the bottom surface</image:caption>
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              <image:caption>screenshot of part of spreadsheet showing data entry section</image:caption>
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              <image:caption>image of e-book</image:caption>
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              <image:caption>image of e-book</image:caption>
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              <image:loc>http://www.understanding-cement.com/images/allscreensaversmall.jpg</image:loc>
              <image:caption>horizontal strip of four small images that can be downloaded as screensaver/desktop images</image:caption>
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              <image:loc>http://www.understanding-cement.com/images/ucebook130wide.jpg</image:loc>
              <image:caption>image of e-book</image:caption>
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              <image:caption>Image showing examples of some items in the glossary</image:caption>
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              <image:caption>optical microscope image of minerals</image:caption>
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            <lastmod>2011-12-21T08:40:20-05:00</lastmod>
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              <image:loc>http://www.understanding-cement.com/images/poorcuring1.jpg</image:loc>
              <image:caption>image of poorly-cured concrete showing a porous near-surface region with much unhydrated cement</image:caption>
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            <lastmod>2011-12-21T08:51:56-05:00</lastmod>
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            <lastmod>2010-08-20T12:23:24-04:00</lastmod>
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              <image:caption>Image of e-book</image:caption>
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              <image:caption>viaduct viewed from train and glenfinnan monument</image:caption>
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              <image:caption>Glenfinnan viaduct, plaque on an arch celebrating the viaduct&#39;s centenary</image:caption>
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              <image:caption>Glenfinnan viaduct, western end, looking South</image:caption>
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              <image:caption>Glenfinnan viaduct, detailed view of formwork impressions</image:caption>
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              <image:caption>viaduct arches with hills behind</image:caption>
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              <image:caption>Glenfinnan viaduct, distant view with hills to the North</image:caption>
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              <image:caption>Glenfinnan viaduct, impressions of wooden formwork and lime - now carbonated - leached from arch</image:caption>
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              <image:loc>http://www.understanding-cement.com/images/hadrianswallsmaller.jpg</image:loc>
              <image:caption>Hadrian&#39;s wall, England, a few miles east of Housesteads.</image:caption>
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              <image:loc>http://www.understanding-cement.com/images/allscreensaversmall.jpg</image:loc>
              <image:caption>horizontal strip of four small images that can be downloaded as screensaver/desktop images</image:caption>
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              <image:caption>Heat evolution curve from conduction calorimetry</image:caption>
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            <lastmod>2010-07-04T11:11:28-04:00</lastmod>
            <priority>0.9</priority>
            <image:image>
              <image:loc>http://www.understanding-cement.com/images/ucebook130wide.jpg</image:loc>
              <image:caption>image of e-book</image:caption>
            </image:image>
      </url>
      <url>
            <loc>http://www.understanding-cement.com/water-cement-ratio-estimate.html</loc>
            <lastmod>2011-12-21T08:26:47-05:00</lastmod>
            <priority>0.5</priority>
            <image:image>
              <image:loc>http://www.understanding-cement.com/images/wctest1.jpg</image:loc>
              <image:caption>two images of cement pastes for testing against the reference images above</image:caption>
            </image:image>
            <image:image>
              <image:loc>http://www.understanding-cement.com/images/ucebook130wide.jpg</image:loc>
              <image:caption>image of e-book</image:caption>
            </image:image>
            <image:image>
              <image:loc>http://www.understanding-cement.com/images/wcpics2c.jpg</image:loc>
              <image:caption>four reference images of cement pastes made using different water-cement ratios</image:caption>
            </image:image>
      </url>
</urlset>

