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Donegal quarry blocks and housing issues

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  • 16-06-2016 9:18am
    #1
    El Siglo
    Registered Users Posts: 3,803 ✭✭✭


    Seen there on Prime Time recently about the controversy surrounding the use of quarried materials for building blocks, consisting of mica. Some interesting Dáil debate on it and it's been over the different papers recently. The presence of muscovite mica is interesting alright, especially given the fairly 'mixed bag' of geology that exists in Donegal. Mica is the main material within schist, and with coarse aggregate in Donegal it was primarily schist (a metamorphic rock). The high amounts can be problematic in concrete in that it's been shown that quantities in excess of 30% of the fine grained material is mica, and with mica dust present this results in an increase in water demand and lower durability. It's actually pretty mental, because the strength of the material can be reduced by 5% when only 1% of mica is present in the concrete.


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    #2
    Colin Clarke
    Registered Users Posts: 17 ✭Colin Clarke


    El Siglo wrote: »
    Seen there on Prime Time recently about the controversy surrounding the use of quarried materials for building blocks, consisting of mica. Some interesting Dáil debate on it and it's been over the different papers recently. The presence of muscovite mica is interesting alright, especially given the fairly 'mixed bag' of geology that exists in Donegal. Mica is the main material within schist, and with coarse aggregate in Donegal it was primarily schist (a metamorphic rock). The high amounts can be problematic in concrete in that it's been shown that quantities in excess of 30% of the fine grained material is mica, and with mica dust present this results in an increase in water demand and lower durability. It's actually pretty mental, because the strength of the material can be reduced by 5% when only 1% of mica is present in the concrete.

    And look where we are today, 5 years on, up to 5700 homes will have to be demolished and rebuilt and while our government drags their heels 5700 family's live in fear of losing their homes or worse their lives. We love rather we are supposed to live in a progressive country, a modern country yet we let this not only happen but drag on. This is 5700 families who could become homeless unless something progressive is done and done now. It is a disgrace


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