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.

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Presentation transcript:

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

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