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  • Users: charnott
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  1. charnott

    Piling through revetment quarry run

    Concept design is for a secant piled wall to construct a seawater intake structure on an offshore reclaimed island. bored cast in situ piling is prevalent in the region and more importantly the equipment is available at the remote site. Contractor is unable at this time to provide a detailed...
  2. charnott

    Mosul Dam Grouting Scheme - 30years and counting

    Admit to be totally astonished at this story having seen the Dam in recent headlines. Not a query of any sorts but simply an interest piece for digestion. Quite what they are aiming to achieve by continuing the grouting for such a length of time I have no idea. At least one of the references...
  3. charnott

    Gypsiferous Soils suitability for use in Tank Subbase

    Excavation for 1M barrel tank producing soils with gypsum content 7-26% by weight, water soluble sulphate content is 0.72-2.81%. Spec, probably mistakenly, prohibits more than 5% gypsum in subgrade beneath tank. I suspect the intent of the clause was to capture soluble sulphate content of 5% and...
  4. charnott

    Gypsiferous Soils in Tank Subbase

    Excavation for 1M barrel tank producing soils with gypsum content 7-26% by weight, water soluble sulphate content is 0.72-2.81%. Spec, probably mistakenly, prohibits more than 5% gypsum in subgrade beneath tank. I suspect the intent of the clause was to capture soluble sulphate content of 5% and...
  5. charnott

    Layered Compaction overlying hydraulic fill

    Have a query/accusation from one of the contractors on my scheme that I'd apprecaite some opinion on. Site is an offshore reclaimed island with approx. 20m of hydraulic placed fill (rainbowed by dredger). Ground improvement by vibrocompaction brings that fill up to ~65% relative density. That...
  6. charnott

    Risks associated with groundwater recovery post-dewatering

    I am interested in any knowledge or references people may have regarding the potential for and extent of risks associated with groundwater recovery post dewatering. APOLOGIES: re-posted from other forum as this one more appropriate The site original GWL was approximately +1m elevation...
  7. charnott

    Risks associated with groundwater recovery post-dewatering

    I am interested in any knowledge or references people may have regarding the potential for and extent of risks associated with groundwater recovery post dewatering. The site original GWL was approximately +1m elevation (original site ground level between +1.5 and +3) and has been lowered to...
  8. charnott

    In-Situ Density Test

    The main contractor is required to demonstrate the fill placed in layers and compacted by rollers is 95 or 98% of its MDD. The in-situ test selected by the Contractor is the sand-replacement test with associated OMC/MDD from lab testing. Nuclear density gauge was ruled out due to issues...
  9. charnott

    Silica or Carbonate Sand?

    Our QA/QC department (we are the PMC) have questions over the sand being used by the contractor as replacement sand in the sand replacement test as outlined by BS1377-9 Sect 2.1 The BS requires the replacement sand be clean, closely graded silica sand, provides a consistent bulk density and...
  10. charnott

    Frequency of OMC/MDD insufficient?

    As Program Manager on a large scheme we are concerned by in-situ density test results which regularly show compaction >100% of sampled MDD. The Engineering Design Consultant's specification to which the Contractor is working states that Lab OMC/MDD should be tested 'once a week'. With the...

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