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Laying blocks on concrete base question.

  • 22-04-2021 10:01am
    #1
    westsidestory
    Registered Users, Registered Users 2 Posts: 230 ✭✭


    Am pouring a 10" concrete (35 Newton) foundation after lunch today Thursday. It's for a 4 or 5 course block raised garden bed. Would I be OK to start laying blocks on it tomorrow morning or how long should I wait?


Comments

  • #2
    DOCARCH
    Moderators, Home & Garden Moderators, Science, Health & Environment Moderators Posts: 18,451 Mod ✭✭✭✭DOCARCH


    Not a technical answer/response! I would think best to leave 24 hours minimum?


  • #3
    Gumbo
    Moderators, Society & Culture Moderators Posts: 40,361 Mod ✭✭✭✭Gumbo


    Saturday morning would be better.


  • #4
    Calahonda52
    Registered Users, Registered Users 2 Posts: 12,888 ✭✭✭✭Calahonda52


    10" by what?
    I agree with 24 hrs

    “I can’t pay my staff or mortgage with instagram likes”.



  • #5
    PMBC
    Registered Users, Registered Users 2 Posts: 1,112 ✭✭✭PMBC


    35 N for a couple of blocks! Current concrete strengths puzzle me. Two water towers and a reservoir I worked on late 1970s were 21N and still standing. In one tower the 28 day cubes for the base failed. It was cored and came in at around 12.5 N. Design was re-appraised and accepted.
    I still dont get it.
    Apologies for being a boring old fart


  • #6
    mickdw
    Registered Users, Registered Users 2 Posts: 23,688 ✭✭✭✭mickdw


    PMBC wrote: »
    35 N for a couple of blocks! Current concrete strengths puzzle me. Two water towers and a reservoir I worked on late 1970s were 21N and still standing. In one tower the 28 day cubes for the base failed. It was cored and came in at around 12.5 N. Design was re-appraised and accepted.
    I still dont get it.
    Apologies for being a boring old fart

    There is little to be saved when buying a cubic metre or 2 in specing low strength concrete so 30 or 35N is going to be the typical order.
    28 day strength of 12N is super dodgy though.


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  • #7
    PMBC
    Registered Users, Registered Users 2 Posts: 1,112 ✭✭✭PMBC


    Yea, I take your point.
    Its 30m high and holds 50,000 gallons.


  • #8
    mickdw
    Registered Users, Registered Users 2 Posts: 23,688 ✭✭✭✭mickdw


    PMBC wrote: »
    Yea, I take your point.
    Its 30m high and holds 50,000 gallons.

    Thats 227000 litres
    227 cubic meters
    Or 227 tonnes of water.

    Despending on the design of the structure, the compressive strength may not be so critical in some areas.


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