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Question about Concrete Step Barriers (on M7)

  • 20-12-2018 4:08pm
    #1
    Seoda1
    Closed Accounts Posts: 77 ✭✭


    Hi


    I am hoping someone can put me out of my misery!


    Over the last couple of months, I have watched everyday the construction of the concrete step barriers on the new M7 widening works on the Naas Road between junction 9 and 10.


    I hadn't taken much notice of them before now but when you're travelling at 60 Km/h, there's not much else to do!


    Anyway, my question is, why do the make a cut in the freshly built barrier every 8 feet or so, going from top to bottom? At first, I guessed it would be to allow for expansion, but then I think that concrete doesn't expand like steel does?


    Hopefully someone here can help me!


    Thanks


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