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  • Users: SirAl
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  1. SirAl

    Diagonal vs. Conical Failure of Test Cylinders

    I am interested in your opinions and experiences regarding the failure mode of test cylinders. Should concrete test cylinders with compressive strengths in the range of 3000psi to 4500psi break as a diagonal failure or as a conical failure? At what strength ranges are diagonal failure types...
  2. SirAl

    Pavement Elevation Tolerances

    For a large, broad, paved (ACP) commercial lot (a parking lot for example) I would appreciate your comments as to a reasonable construction tolerance in elevation from design to as-constructed grades.
  3. SirAl

    Belled Caisson Construction

    For belled, end bearing caissons, I am interested in obtaining opinions concerning the taper angle from the shaft (at the top a of bell reamed at the base of a pile boring) to the bottom (bearing surface)of the bell. The soils of interest are clays and clay tills with working end bearing...
  4. SirAl

    Fly Ash in Theoretical Concrete Mix Design

    I generally apply the ACI volumetric mix design approach when calculating theoretical porportions. Fly ash, being a pozzolan, is commonly substituted for a portion of Portland cement in the mix. Accepting that the fly ash composition meets all ACI/ASTM/CSA criteria, can the fly ash be...
  5. SirAl

    Clay Minerology

    I am based in an area where surfacial soils (< 5m to 6m) are predominately lacustrine clay deposits. The upper portion (1.5m - 2.0m) are high plastic clays with liquid limit and plastic limit values commonly in the 60% to 85% and 23% to 33% ranges respectively. This upper layer grades to a...

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