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Use of a Nuclear Gauge to determine the density of undisturbed native soil has no value, even if they took a sample and ran a 5 point Proctor test on it.

Take a look at 785 8th Avenue...30'x90'x50' and 43 stories ... 18:1 ratio...my firm designed the structure.

If the abandoned holes do not interfere with the new holes, leave them be...if they conflict or are within an inch, install a square washer over the new hole and the old one with a 1/2" lap and weld all around the lap joint.

Looks like Galling to me.

The are made of HD Plastic and are 12" but can be oval in the wall. They put a weight on the end to make sure they go down far enough. they can be cut to length and are considered a disposable item,. Large square funnel attachment goes on the top. I have attached a catalogue page from a local...

We have jobs we design where the walls are 26 ft and we limit vertical drop to 14 ft. This requires the contractor to use a snorkel pipe to place the concrete to prevent segregation of the aggregate from the cement. Vibration is an issue due to the height so they could use formwork vibrators...

What I have seen here in NYC in Schools and Municipal buildings of the age is they used corrugated metal panels spanning from beam to beam at web/bottom flange angle in an arch. Filled on top with Cinder concrete. We do not even attempt to repair in kind, we rip it out and do standard reinforced...

I have seen this sourced in NY/NJ area as it is used to repair NYC Schools built in 1920-1930's that used this system. I was told it is available from most suppliers as it is used for temporary construction dams and such. Is there a specific reason you have to use the original product/modern...

Looks like nothing more than average mill scale surface rust and no loss of section is visible.

Non Shrink Grout with 1/4" Pea Stone as aggregate placed in one lift would be acceptable.

The way I have interpreted this spec is 20% of all welds to receive MPI translates to 1 in 5. But also reference the requirements for failure which may increase the amount of welds to be inspected.

A "full depth partial penetration weld" is a PJP no matter what you choose to call it but calling it a "full penetration weld" is asking for trouble. Only a Complete Joint penetration weld is a CJP. Change you use of "full depth partial penetration weld" to describe something that IS NOT a CJP.

General Rule in USA is Cylinders (6"x12" or 4"x8") for Concrete and Cubes (1"x1" or 2"x2") for Mortar/Grout with some labs doing Cylinders for Grout (3"x6").

As was said in "The Incredibles" There is no school like the old school!

Having been the guy on the core drill more than once in my career, I can opine on this: 1) After the core was taken did they techs allow the core to dry out or was it protected as per ACI specs? (More than once I have seen cores stacked in an empty bucket and then in the back of the truck). 2)...

Welcome Aboard! The first round is on you![thumbsup2]

Bolt Head should be marked with Makers mark, ID (AA325TC or A490TC) and Nut/Washer marked as well. Connection requirements should be noted on erection plans. also check notes and local regs for inspection requirements -Observation, Skidmore qualification of bolts and bolting gun(s, etc. Minimal...

Define "I want to check the whole weld"...what exactly are you looking for?" a) Inclusions b) To define the HAZ boundary c) Cracking d) ?? A combo of UT and MP can be done or RT if available but UT/MP is faster cheaper safer

Your obligation to perform FF/FL verification does not override the contractors obligation to perform saw cutting within 12 hours as per code. I have been on both sides of this issue as an Inspector and as a Contractor. Saw cutting should not affect FF/FL Verification as the saw cuts only go...

Did you think about reverse import from the approved manufacturer? We had to do this for a job and found a dealer in SA who had the items by the approved manufacturer in stock and it worked out well in the end.