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Crack formation leads to ingress of H 2 0 and CO 2, resulting in reduction of pH to <12 around crack Capsules at pH <12 expand, shell weakens and liquid.

Published byBryan Walker Modified over 8 years ago

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Presentation on theme: "Crack formation leads to ingress of H 2 0 and CO 2, resulting in reduction of pH to <12 around crack Capsules at pH <12 expand, shell weakens and liquid."— Presentation transcript:

1 Crack formation leads to ingress of H 2 0 and CO 2, resulting in reduction of pH to <12 around crack Capsules at pH <12 expand, shell weakens and liquid centre gels in Ca 2+ rich environment to seal crack from further ingress. bulk cement pH >13

2 https://www.llnl.gov/sites/default/files/field/i mage/capsule700x425.jpg

3 http://www.google.de/imgres?imgurl=http%3A%2F%2Fwww.graphicall.org%2Ff tp%2Fideasman42%2Fhtml_manual%2F_images%2FDoc26-extrude-edges- before.png&imgrefurl=http%3A%2F%2Fwww.graphicall.org%2Fftp%2Fideasman 42%2Fhtml_manual%2Fmodeling%2Fmeshes%2Fediting%2Fduplicating%2Fextr ude.html&h=513&w=568&tbnid=ylH5TADjrKieVM%3A&docid=nMu1Dddh1KQr AM&itg=1&ei=T9_AVfujAqLQygOv16foCA&tbm=isch&iact=rc&uact=3&dur=208 5&page=3&start=58&ndsp=37&ved=0CO8BEK0DMENqFQoTCLuHr_vjj8cCFSKoc godr-sJjQ

4 http://www.google.de/imgres?imgurl=http%3A%2F%2Frobinsonlan dscape.com%2Fimages%2Fcracking- concrete.jpg&imgrefurl=http%3A%2F%2Frobinsonlandscape.com% 2Fconcrete%2Ftwo-types-of-concrete-concrete-that-has-cracks- and-concrete-that-will- crack%2F&h=165&w=287&tbnid=_hdLIQfUKOybDM%3A&docid=wJ _PvMxJE2nRAM&ei=IuDAVbnEFqe6ygO_gYWgAQ&tbm=isch&iact= rc&uact=3&dur=495&page=1&start=0&ndsp=25&ved=0CEIQrQMw C2oVChMIud2R4OSPxwIVJ51yCh2_QAEU

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