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.
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.
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...
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").
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)...
