Compressive strength of concrete for skin friction piles
Compressive strength of concrete for skin friction piles
(OP)
How does one determine the required minimum 28 day compressive strength of concrete for cast-in-place skin friction piles?
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Compressive strength of concrete for skin friction piles
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RE: Compressive strength of concrete for skin friction piles
Answer #1: You pick 3,000; 3,500; 4,000 etc. based on the size of the pile that each choice will result in vs. the cost of that size pile.
Answer #2: You take standard test cylinders of the concrete at the time of pouring the pile and test them to see if they meet the specification.
RE: Compressive strength of concrete for skin friction piles
RE: Compressive strength of concrete for skin friction piles
you state that tests ON SITE revealed a reduced strength.
Cubes stored and tested on site will often give a low reading because the conditions are not equivalent to the en masse, in situ conditions of the actual structure.
The actual strength of the piles can be determined by removing the top meter of some of the piles to reach sound material and taking cores for testing in a laboratory.
The strength of concrete in tension piles affects
- the bond between rebar and concrete. This will not be a problem if the rebar is sufficiently long to achieve full bond strength.
- the resistance of the pile to corrosive groundwater. The sub soil survey should provide info on this.
Good Luck.
RE: Compressive strength of concrete for skin friction piles
RE: Compressive strength of concrete for skin friction piles
A typical load test will almost certainly show that your pile/soil system will carry the intended axial load at the time of the test, but will not tell you anything about the loss of reinforcement protection.
I think you need to concentrate on the concrete itself. Perhaps you could get some help from corrosion protection specialists. They might have some cunning electrical resistivity test which would tell them something about the effectiveness of the concrete cover (I don't know whether there is such a test, but it could be worth enquiring).
Good luck