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...
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.
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...
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...
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...
