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I will visit the site tomorrow and update. BTW, what are the simple methods of checking crack depth. I have a tool for measuring crack width.

Hi, I need expert opinion on possible reasons for cracks shown in attached pictures. Element - basement ground slab Thickness - 450mm RF details - T1, T2, B1, B2-T16@200 (QT bars) Clear cover - 50mm Ambient temperature during casting - 27-30 Celsius. (Sri Lanka 6pm to 6am) Mix design (kg/m³)...

Dear MIStructE IRE, I personally observing process of cube making and curing. We follow standards without fail.

Hi Friends, Recently I experienced a bit high variation of our strength results of C50 ready-mix concrete purchasing for slabs and columns casting. We expect 37.5 N/mm2 as 7 days strength for C50 (i.e. 75% of design strength as per Sri Lanka Standards). Can anybody help me on following...

Thanks Ron, Any technical guidelines please....

Hi, Is there any guidelines for installing copper tape (of lightening protection system) within reinforced concrete? I noticed that a copper tape runs in concrete slab just rest on the rebar net. Is it OK? Isn't there any risk of affecting inhabitants during lightening? Thanks.

Hi friends I came again with a new issue at my project. As the photo shown, there are 10mm starter bars around all core walls which is difficult to handle as we cast the core wall 02 levels higher in advance than the working level for ease of supporting placing boom. Our procedure has to break...

@Tommy385: I have the same concern @MIStuctE: Yes. Done.

@Juan: 15mm layer out of 70mm compression zone is affected and it is unavoidable. Large number of conduits is the issue as it considerably reduce the amount of concrete in compression zone. According to ACI minimum spacing is 3 times the conduit diameter.

Thanks a lot @KootK. Really helpful.

Thanks @hokei66. My concern is not that. Is there a sufficient concrete amount to bear the design load?

Hi, Please see attached photo showing spreading electrical conduits over 140mm thick slab. Cover to steel is no issue but I doubt about amount of concrete actually in the slab as conduits consume considerable volume. I'm searching for limitations, if any, for amount of voids allocation withing a...

Hi, I am currently involving in construction of 50 storied building. Would you please to share some guidelines/specifications/documents regarding "quality assurance in high rise building construction"? I need to prepare a quality assurance plan for project that include what quality matters...

Hey friends, Its me came with new problem. Due to a mistake of rig operator, a set of 4 casings was fallen back into borehole. Can you please suggest any suitable method to extract them out. Top of casing set is at around 7-8 meters below the ground level. This trouble is now becoming a...

Ron, We are in the process of analyzing chemical in water and soil. Will come back soon once receipt of results. BTW, what is SLTA? [smile]

But we tried with three different suppliers. at least one pile concreted from each supplier resulted in premature hardening.

In our site, in which still secant pile construction in progress, we experienced concrete had been hardened rapidly (in less than initial setting time) in several piles along the boundary closer to sea. This pile line is about 120m from sea. Could you please state possible reasons for this and...

Case in my site: Structural designer specified to keep 25mm cover to concrete walls and columns for fire protection and due to unrecoverable mistake we had to cut concrete layer in one side of column up to reinforcement bars to align particular column with others. Next, column should be...

Image shows that partially cut concrete surface in a bath room for inserting gully box, which could not be placed during concreting. There is 10mm tor steel bar (hogging steel for slab over beam), which is @175mm C/C. Imagine gully box location cannot be moved and steel bar should have to been...

Thanks Ron & Rapt.....