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  1. maddog67

    3d scanning of precast elements

    Hi everyone, Looking for some advice/suggestions . I work for a UK based manufacturer of bespoke precast concrete elements,specializing in curved and spiral staircases . Mould and final product inspection is both labour and time consuming ,not to mention complicated.Is there a suitable option on...
  2. maddog67

    Structural precast detailling

    hanks for that KootK . As I am in the UK I would expect that the errors and omissions insurance would be similar to public / company liability insurance .Hopefully if that is the case , I would be able to employ a structural engineer who was covered by the parent companys public liability...
  3. maddog67

    Structural precast detailling

    Hoping that someone out there can help . I have recently started with a small bespoke precast company who specialise in curved stairs etc . I am trying to source someone who can produce the structural reinforcement details and production drawingsfor individual units ( CAD drawings ) , and...
  4. maddog67

    Low water / cement ratio durability issues

    Have been trying to comply with a concrete specification for an XD3 exposure class . BS 8500-1 Table A4 dictates that for an intended working life of 50 years with 40mm+ reinforcement cover a C45/55 is required with a minimum CEM content of 380 and maximum w/c ratio of 0.35 . Having difficulty...
  5. maddog67

    Camber in prestressed concrete

    I am trying to find out the predicted camber of a prestressed hollowcore unit . Rule of thumb is usually length/300 . However some publications say this is to determine the maximum allowable camber , whereas others say it is the predicted camber and subsequently has a 50% margin of error plus or...
  6. maddog67

    prestressed strand values

    Could anyone advise me on the effect a reduction of say 5% ,on the stress values on the strand in a hollowcore unit would have on the load / span capabilities of the slab . I assume that the tension to which the strand is stressed has a direct correlation to the physical properties of the...
  7. maddog67

    Destructive Load Test Of Hollowcore Unit ?

    Could anyone give me details of any procedure showing a method for load testing a hollowcore slab to destruction . Details of load increments and types of failure to consider , would be most helpful . Cheers Maddog
  8. maddog67

    web cracking in prestressed hollowcore

    I work for a hollowcore company , who are suffering from a problem at present , where after detensioning , the webs of the slabs are suffering from lateral cracking / splitting .The hollowcore is produced by a slipforming process where the top and bottom of the unit is produced in seperate...
  9. maddog67

    28 day cube testing

    I work for a prestressed concrete floor manufacturer , within the Quality Department . We test 24 hour and 7 day cubes in house but all 28 day cubes are sent to an independant laboratory for testing . I was hoping that someone could tell me the necessary measures or accreditation that a company...
  10. maddog67

    steel fixing clips

    I am trying to locate a supplier for steel fixing clips for tying rebar . I reckon they are called either Quick Clips or Speedy Clips . If you could provide me with a name and / or supplier I would be grateful
  11. maddog67

    Rebar versus strand comparison

    I was hoping someone could give me some information regarding the posssibility of substituting 16mm rebar in a cantilever with 9.3mm strand . I am told that it is possible , in this application of a hollowcore slab , but I was hoping for some other opinions . To achieve similar properties to...

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