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  1. Nawabfarhan

    Surface Cracks on Reinforcing Steel

    Dear Sirs, Let me elaborate the appearance of these cracks. They are longitudinal hair cracks, visible at some places (not all along the 12 meter rebar. The average dimensions are LT 1mm(width) x LT 2mm (depth, and LT also 1mm in some locations) x LT 5-8mm (length). Are they vulnerable? Could...
  2. Nawabfarhan

    Surface Cracks on Reinforcing Steel

    Dear All, On the Project that uses uncoated black steel conforming to ASTM A 615 Grade 60, field inspections and third party testing are regular Quality Control activities. In one such consignment of 32mm rebar, we found some surface cracks penetrating less than 2mm deep, width about 1mm. The...
  3. Nawabfarhan

    Depth of Excavation ??

    The problem is not much the concrete base than the embedded U bolts. These bolts are ASTM A307 Grade A quality under use for the last 30 years. During this time most of these U bolts under static & dynamic lateral loads have sheared from the top. So we cant use them any more leading us to...
  4. Nawabfarhan

    Depth of Excavation ??

    Dear All, Background : Around 10000 sqm area is built 30 years ago to transfer/carry ship-lift loads from the piers to the dry docks for ship repairs. The cross section of the base is as below, from bottom: 1. Compacted Subgrade to 95% of Max Dry Density (MDD). 2. Compacted to 100% MDD sub...

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