Low Strength Concrete in Permanent Shoring Piles
Low Strength Concrete in Permanent Shoring Piles
(OP)
For a project with a seven story basement, I'm evaluating a proposal to use the secant pile excavation shoring as a permanent load resisting element (hydrostatic / earth pressure loads). The shoring tie backs would be assumed to become ineffective over time and the secant piles themselves would span between floor diaphragms. Every second concrete shoring pile will encase a steel pile. Composite action will be assumed.
Our primary secant piles are 10 MPa concrete and our filer piles (every second one) will be 4 MPa concrete. I have two concerns regarding the low concrete strengths proposed:
1) What is the minimum f'c for durability?
2) What is the minimum f'c for composite action?
Reference to any pertinent standards would be appreciated. Our geotechnical consultant will be signing off on this system. That being the case, I still need to ensure that I'm comfortable with it conceptually.
Thanks,
KootK
Our primary secant piles are 10 MPa concrete and our filer piles (every second one) will be 4 MPa concrete. I have two concerns regarding the low concrete strengths proposed:
1) What is the minimum f'c for durability?
2) What is the minimum f'c for composite action?
Reference to any pertinent standards would be appreciated. Our geotechnical consultant will be signing off on this system. That being the case, I still need to ensure that I'm comfortable with it conceptually.
Thanks,
KootK






RE: Low Strength Concrete in Permanent Shoring Piles
And seriously 10MPa and 4MPa are they mixing this stuff by hand? That's terrible strength concrete.
RE: Low Strength Concrete in Permanent Shoring Piles
The same geotech that will be responsible for the shoring design will be giving us the green light for sulphates.
The goal of the 4 MPa concrete is for it to be weak. Every second pile has to be drilled through it's neighbors.
RE: Low Strength Concrete in Permanent Shoring Piles
RE: Low Strength Concrete in Permanent Shoring Piles
http://www.nceng.com.au/
"Programming today is a race between software engineers striving to build bigger and better idiot-proof programs, and the Universe trying to produce bigger and better idiots. So far, the Universe is winning."
RE: Low Strength Concrete in Permanent Shoring Piles
RE: Low Strength Concrete in Permanent Shoring Piles