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How do you rank Construction Management for a Civil Engineer? Engr. Shakeel Ahsan Director Engineering CMEC Washington, DC

Dear All, I was wondering if anyone has done a research on the structural design of Egyptian Pyramids. I am interested in the design, looking forth to design a similar type of structure on modern lines. Your input is highly appreciated as always. Regards, Engr. Shakeel Ahsan Director...

Dear All, What is the maximum cylindrical compressive strength that can be achieved, basing on volumetric mix of concrete as follows. 1. 1:2:4 2. 1:1.5:3 3. 1:4:8 I would seek your expert opinion on if it is possible to achieve 3000 Psi cylinder strength using OPC and mix ratio (1:2:4) and...

Some 500 Kg exploded in a vehicle. Dik, can I get your report? Engr. Shakeel Ahsan Director Engineering CMEC - Pakistan

Dear All, There was an explosion in Lahore this morning and we were called in to evaluate structural strength of one of our client's Building (RCC structure)amid the situation. The building was within 2 Km from explosion site and has observed minute cracks in architectural finishes, building...

These are single storey structures, with no roof water/ heat proofing at all. During my inspection visit to site, it was revealed that the structures never had any roof drainage system, leaving the area exposed to rains and extensive sun light. Temperature in this area goes up to 50C and...

Dear All, I have these results for Concrete Cores from laboratory now. I'd request comments from all of you. Sample L/d Correction Load Strength Corrected Strength No. Ratio Factor N (N/mm2) Strength (lb/in2) 1 1.25 0.94 139250...

For hospital building under consideration, certain ducts have been provided to lead the conduits from one floor to other, however, from point to point, due to architectural planning, it is not possible to run a trench all across the building. Also, how effective can this thick floor finish be...

How helpful is stiffness at Column - Beam joints? Engr. Shakeel Ahsan Director Engineering CMEC - Pakistan

What is the unit cost for Hydro blasting, Sand blasting and Dry Ice? You can give the unit cost for your area, I'd just like to interpret it for Pakistan.

Would that be a good idea to set different fc' for Columns and other structural members. We have set fc' for columns at 3750 Psi and for raft, retaining walls, shear walls, beams and slabs at 3000 Psi. How this helps increasing stiffness at joints?

Could you please give a description of how the structure responses better with a conventional frame system than a flat slab? Engr. Shakeel Ahsan Director Engineering CMEC - Pakistan

Thickness of slab is 6" and clear cover to reinforcement steel is 0.75". Could you please explain how sandblasting to this slab would be done, the procedure I may recommend to my client, if approved? Engr. Shakeel Ahsan Director Engineering CMEC - Pakistan

Dear All, For a high seismic activity zone, what frame system for a multi storey RCC building should be proposed. Two options being; 1. Flat Slab supported directly on columns 2. Conventional Beam Slab supported on columns. Recommendations requested. Engr. Shakeel Ahsan Director...

Here is the composition of floor finishing for this hospital. Porcelain/ Terrazzo Tile with mortar bed over 1.5" Thick Concrete (1:2:4) over 4 " Thick PCC (1:4:8) over RCC Slab My question is if it is right practice to recommend such a flooring, 4" thick PCC (1:4:8) is sometimes required to...

Dear all, We are in the phase of designing a new cardiac center. The building has 7 Floors and has got 400,000 Sft covered area. What should be the minimum and maximum thickness of (PCC 1:2:4 as floor finish on each slab) for such a hospital building? The building would be constructed in an...

Existing beams appear in much better condition, with no visible cracks or spalling of concrete. Please see attached picture for a better idea of physical condition of beams. Engr. Shakeel Ahsan Director Engineering CMEC -...

Thanks to you all for replies. Indeed it is spalling of concrete. Adding another mat of steel in that slab, might be a solution, but do you think this can be achieved through introducing Structural Steel section, like channels supported on existing beams and perlins at short spans welded to...

BigH, I await the article by Neville in Concrete International about coring and evaluation of cores. Ali, The last resort would be demolishing the structure, but this is a workshop area, with lots of machines installed underneath the roofs to be treated or demolished, which makes it...

Thanks for your replies. I am located in Pakistan, and we follow ACI Codes, and ASTM. Our client requires a witness representation from us as Consultants, while the Material Testing Laboratory Team, takes out the cores for testing. I have recommended at least 4"x4" Cube cores for Slabs. The...