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              <image:caption>Infra-red image of cement kiln, showing hotter (yellow, burning zone) and cooler (red, mauve, blue) regions</image:caption>
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            <loc>https://www.understanding-cement.com/27causes.html</loc>
            <lastmod>2025-07-09T15:14:33.000000Z</lastmod>
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              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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              <image:caption>Photo of concrete cube with black background and caption: Concrete Strength Problems? Coming Soon.</image:caption>
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              <image:caption>Image of Understanding Cement book cover</image:caption>
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            <loc>https://www.understanding-cement.com/ASRVideo1.html</loc>
            <lastmod>2018-05-23T15:19:19.000000Z</lastmod>
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            <lastmod>2013-02-08T16:29:12.000000Z</lastmod>
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            <lastmod>2017-06-08T12:10:51.000000Z</lastmod>
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            <loc>https://www.understanding-cement.com/alkali-silica.html</loc>
            <lastmod>2025-07-10T12:59:55.000000Z</lastmod>
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              <image:loc>https://www.understanding-cement.com/images/10causessidebar1.png</image:loc>
              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/asr1a.jpg</image:loc>
              <image:caption>Picture of aggregate particle with extruding alkali-silica gel</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/asr4.jpg</image:loc>
              <image:caption>Figure 3 Detail of chert particle in previous image, showing alkali-silica gel extruded into cracks within the concrete. Ettringite is also present within some cracks.</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/cubebanner1c.jpg</image:loc>
              <image:caption>Photo of concrete cube with black background and text: Concrete Strength Problems? Click the cube for 27 answers.</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/ASR2.jpg</image:loc>
              <image:caption>Figure 2 Polished section of concrete, scanning electron microscope image: chert aggregate particle with internal cracks due to ASR extending from the aggregate into the nearby concrete (arrowed).</image:caption>
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              <image:caption>Image of Understanding Cement book cover</image:caption>
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            <loc>https://www.understanding-cement.com/analysis.html</loc>
            <lastmod>2025-05-30T16:32:35.000000Z</lastmod>
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              <image:loc>https://www.understanding-cement.com/images/10causessidebar1.png</image:loc>
              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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              <image:caption>Image of Understanding Cement book cover</image:caption>
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            <loc>https://www.understanding-cement.com/analytical-techniques-interest.html</loc>
            <lastmod>2016-09-19T15:36:16.000000Z</lastmod>
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            <loc>https://www.understanding-cement.com/asr_and_glass.html</loc>
            <lastmod>2015-03-31T16:32:17.000000Z</lastmod>
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              <image:loc>https://www.understanding-cement.com/images/10causessidebar1.png</image:loc>
              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/detail_paste_and_glass.jpg</image:loc>
              <image:caption>Image showing residual alkali silicate gel adhering to the glass surfaces (arrowed).</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/general_view_of_paste_and_glass.jpg</image:loc>
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              <image:loc>https://www.understanding-cement.com/images/gel_spt.png</image:loc>
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              <image:caption>Image of cracked glass tube containing cement paste</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/lmstvideosidebarimage.png</image:loc>
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              <image:loc>https://www.understanding-cement.com/images/ASRinconcretesemvideothumbnail.png</image:loc>
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              <image:loc>https://www.understanding-cement.com/images/gel_in_crack_in_glass.jpg</image:loc>
              <image:caption>SEM image showing a detail of the crack in Figure 2; the crack contains alkali silicate gel (arrowed).</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/ucbkcover280x450.jpg</image:loc>
              <image:caption>Image of Understanding Cement book cover</image:caption>
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      <url>
            <loc>https://www.understanding-cement.com/autoclaved-aerated-concrete.html</loc>
            <lastmod>2015-12-13T16:08:30.000000Z</lastmod>
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              <image:loc>https://www.understanding-cement.com/images/10causessidebar1.png</image:loc>
              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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            <image:image>
              <image:loc>https://www.understanding-cement.com/images/cemlimesand.jpg</image:loc>
              <image:caption>SEM image of polished section showing a detail - a cell wall - of a block made with cement, lime and sand mix.</image:caption>
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              <image:caption>Green cake being cut by wires (Picture courtesy H+H UK Ltd.)</image:caption>
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              <image:caption>Green cake rising in mould (Picture courtesy H+H UK Ltd.)</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/ucbkcover1580x497.jpg</image:loc>
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              <image:loc>https://www.understanding-cement.com/images/aircretepour.jpg</image:loc>
              <image:caption>Slurry being poured into moulds (Picture courtesy H+H UK Ltd.)</image:caption>
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              <image:caption>&quot;Green&quot; blocks being loaded into an autoclave (Picture courtesy H+H UK Ltd.)</image:caption>
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              <image:caption>Graphic showing components and products in aircrete production</image:caption>
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              <image:caption>Image of Understanding Cement book cover</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/aircreteblock.jpg</image:loc>
              <image:caption>Autoclaved aerated concrete block with a sawn surface to show the cellular pore structure (Picture courtesy H+H UK Ltd.)</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/aircretedetail.jpg</image:loc>
              <image:caption>Detailed view of cellular pore structure in an aircrete block.</image:caption>
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            <loc>https://www.understanding-cement.com/basic-chemistry.html</loc>
            <lastmod>2017-08-01T15:43:50.000000Z</lastmod>
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              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/ucbkcover280x450.jpg</image:loc>
              <image:caption>Image of Understanding Cement book cover</image:caption>
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            <loc>https://www.understanding-cement.com/basic.html</loc>
            <lastmod>2025-07-09T14:46:47.000000Z</lastmod>
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              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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              <image:caption>Image of Understanding Cement book cover</image:caption>
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              <image:caption>Difference between Cement (left) and clinker (right). The coin is a UK one-pound coin about 23mm across.</image:caption>
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            <loc>https://www.understanding-cement.com/bogue.html</loc>
            <lastmod>2019-03-22T13:41:11.000000Z</lastmod>
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              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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              <image:caption>Photo of concrete cube with black background and text: Concrete Strength Problems? Click the cube for 27 answers.</image:caption>
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            <lastmod>2023-01-27T14:22:04.000000Z</lastmod>
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              <image:loc>https://www.understanding-cement.com/images/10causessidebar1.png</image:loc>
              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/ppslab.jpg</image:loc>
              <image:caption>Phenolphthalein indicator solution applied to a fresh fracture surface through a concrete slab.</image:caption>
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              <image:caption>Image of Understanding Cement book cover</image:caption>
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              <image:caption>Photo of concrete cube with black background and text: Concrete Strength Problems? Click the cube for 27 answers.</image:caption>
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            <loc>https://www.understanding-cement.com/cement-blog.html</loc>
            <lastmod>2018-05-23T15:23:46.000000Z</lastmod>
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              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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              <image:caption>Poorly cured concrete with porous surface</image:caption>
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              <image:loc>https://www.understanding-cement.com/images/cracked_glass_tube.jpg</image:loc>
              <image:caption>cracked glass tube</image:caption>
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            <lastmod>2016-02-09T15:20:09.000000Z</lastmod>
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            <lastmod>2015-01-05T20:04:58.000000Z</lastmod>
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            <loc>https://www.understanding-cement.com/clinker.html</loc>
            <lastmod>2019-03-22T13:41:37.000000Z</lastmod>
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              <image:caption>Image of ebook cover: Low Concrete Strength? Ten potential cement-related causes</image:caption>
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              <image:caption>View inside a (stationary!) cement mill. The part-ground clinker and steel grinding media are clearly visible. (Picture courtesy Castle Cement).</image:caption>
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