Minimum grade for structural concrete
Minimum grade for structural concrete
(OP)
I 'know' that the minimum grade is 20 MPa (although I only use 20 MPa for houses) but is this minimum stated in an AS standard anywhere?
We've been given the task of assessing the effect of 13 MPa concrete as supplied instead of N32 as specified.
I'd like to cut to the chase and say it can't be classed as structural concrete and therefore is not acceptable.
We've been given the task of assessing the effect of 13 MPa concrete as supplied instead of N32 as specified.
I'd like to cut to the chase and say it can't be classed as structural concrete and therefore is not acceptable.





RE: Minimum grade for structural concrete
I've re-read the report and 13 MPa is the 7 day break result, so the 28 day result is likely to be around 20 MPa.
RE: Minimum grade for structural concrete
An expert is a man who has made all the mistakes which can be made in a very narrow field
RE: Minimum grade for structural concrete
I'm looking at a retaining wall and at pedestals so there are 3 criteria (discounting deflection);
- strength
- lap length
- durability (cover to rebar)
RE: Minimum grade for structural concrete
RE: Minimum grade for structural concrete
RE: Minimum grade for structural concrete
I have read through AS3600-2009. Clause 1.1 says the code is applicable for 20MPa to 100MPa (as hokie mentioned).
Otherwise the minimum requirements for strength based on exposure classification, durability, abrasion etc is all in section 4.
Reject it unless other rectification solutions are present.
RE: Minimum grade for structural concrete
Doug Jenkins
Interactive Design Services
http://newtonexcelbach.wordpress.com/
RE: Minimum grade for structural concrete