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  • Users: farhanjnawab
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  1. farhanjnawab

    Dampness in Wall

    Sir, the area is very hot in summer around 46 degrees and minimum temp drops to 10 degs in winter. If humid it should affect the other portion of the wall...
  2. farhanjnawab

    Dampness in Wall

    Dear All, Background: There is a masonary building wall which is affected by dampness / moisture in the middle half of its height. There are no concealed water pipe lines, drainage etc, neither there are any cracks for the outside moisture to penetrate. Query: Why is this wall damp at the...
  3. farhanjnawab

    Rail Inspections

    We are a major Engineering Firm engaged in restoration of Naval Base in Jubail, Saudi Arabia. BACKGROUND: We have rails (136 RE AREA) laid 20 years ago and were in service lifting ship-lift trolleys in a Naval Dock Yard Project. In the due course of its service the coating of the rails is...
  4. farhanjnawab

    Rusted Stainless Steel Plate

    Dear All, Background : Stainless Steel Grade 316 plates were cold bended to manufacture 150x80 L angles for fixing access ladders at marine pier. Problem : After a few days of the installation of these ladders, the stainless steel angle plates used at the joints were found to have a layer...
  5. farhanjnawab

    Cracked Tiles

    Sir, there is no concrete beneath. It is dry lean sand-cement mortar. Please comment
  6. farhanjnawab

    Cracked Tiles

    Dear All, Background : A housing flat around 40 feet by 60 feet, ceramic tiles were installed in all the 5 rooms. Problem : In one of the main hall room, two pieces of these tiles were broken. Now all the tiles in that flat have been cracked and broken, except in kitchen and terrace. We are...
  7. farhanjnawab

    Tolerances in rebar diameters

    As per A615 for deformed bars the variation / tolerances in their diameters has not been mentioned. Instead it refers to A6, where the tolerances for diameters are only for plain bars not deformed. We have rebar diameters measuring 11.1mm for 12mm dia, 15.2mm for 16mm dia...etc. Meaning we...
  8. farhanjnawab

    Rail Tolerances and Coating System

    Thanks. What should be the Acceptance and Rejection Criteria while assessing such old rails. The rails visually have some rust only without any reduction in the section due to corrosion. How to prove to the Clients that we can re-use them with some refurbishment?
  9. farhanjnawab

    Rail Tolerances and Coating System

    Dear Sirs, We have rails laid 20 years ago and were in service lifting ship-lift trolleys in a Naval Dock Yard Project. In the due course of its service the coating of the rails is removed with the top surface being rusted and corroded bottom in some rails, so the rails are now subject to...
  10. farhanjnawab

    Dry Dock Foundation - Sub Base Coarse Layers

    Dear Friends, We have Dry Dock Ship Repair Foundation (100 mtr x 11mtr x 0.5 mtr thick) below which there lies 200mm thick subbase compacted to 100 % MDD. We are supposed to demolish the foundation and remove the sub base layer, re-lay, compact, PCC and then lay concrete foundation a new. While...
  11. farhanjnawab

    Anchor Bolts for Ship Lift Rails

    What other codes have steel which can be bent have chemical results matching with mine? I have tried to search most of the ASTM's for anchor bolts but came out with A325, A490, F1554 whose chemical values are similar to one tested. Mild steel as per A36 has C value max upto 0.270 whereas our...
  12. farhanjnawab

    Anchor Bolts for Ship Lift Rails

    Dear All, We are supposed to rip-off concrete foundation slab 300mm thk holding ship lift 132 lb/yd rails through U type anchor bolts 25mm dia 350mm depth. Most of such bolts are sheared on top and are to be replaced with new ones. Our Contract does not specify the type of anchor bolts i,e. to...
  13. farhanjnawab

    Bond Strength Plain Vs Deformed Bars in Concrete

    The bond strength in concrete of a deformed bar generally will be much higher than a smooth or plain deformed bar.. Is this really true? We are about to conduct pull-out tests, but some people suggests that plain bars will have higher strengths..ironic!! Your comments pls
  14. farhanjnawab

    Concrete Overlay Under Rail Track

    Meaning we need to dig the whole slab (300mm), recompact the subgrade (if possible replace a single layer of base course, compact to 100% MDD and lay new concrete to required levels?? Is this a more durable solution than the repair as specified in our Contract?? some light please...
  15. farhanjnawab

    Concrete Overlay Under Rail Track

    Dear All, Around 10,000 sqm of tansfer pit area contains 9000 meters of rails laid to carry ships lifted over trolley wheels in a Naval Dock Yard. After 30 years of service life without any maintenance the area is left deteriorated and subject to refurbishment. The specs call for chipping 150mm...
  16. farhanjnawab

    Joint Sealant

    Friends, We have tried using bituminous joint sealer which is failed due to sea water splashes. The sea water has high chlorides upto 45,000 ppm. Polysulphide sealant may also not be suitable. Please find attached the pics and pls advice. How to mechanically protect it? 100% water tight joints...
  17. farhanjnawab

    Joint Sealant

    Dear Friends, We have a situation here. One year after constructing a floating pier (40mx15mx2.5m) which floats on to the water with 0.5 m free board, we have bituminous joint seal applied to the expansion joints along the perimeter of the structure that has completely worn out because of the...

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