Cement: Difference between revisions
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* The '''ferrite''' undergoes two progressive reactions with the '''gypsum'''. In the first of the reactions, the ferrite reacts with the gypsum and water to form '''ettringite''', '''lime''' and '''alumina hydroxides''' (i.e. ferric aluminum hydroxide). The ferrite further reacts with the ettringite formed above to produce '''garnets'''. |
* The '''ferrite''' undergoes two progressive reactions with the '''gypsum'''. In the first of the reactions, the ferrite reacts with the gypsum and water to form '''ettringite''', '''lime''' and '''alumina hydroxides''' (i.e. ferric aluminum hydroxide). The ferrite further reacts with the ettringite formed above to produce '''garnets'''. |
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** The garnets only take up space and do not in any way contribute to the strength of the cement paste. |
** The garnets only take up space and do not in any way contribute to the strength of the cement paste. |
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In the end, the hardened cement paste consist of the following : |
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# Ettringite : 15 to 20% |
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# Calcium silicate hydrates, CSH : 50 to 60% |
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# Calcium hydroxide (lime) : 20 to 25% |
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# Voids : 5 to 6% (in the form of capillary voids and entrapped and entrained air) |
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