Common strength of reinforcing & concrete in 1929
Common strength of reinforcing & concrete in 1929
(OP)
Hi Fellows
I am from Australia, I am doing a bridge rehabilitation project. The original design is from the Main Road Board in 1929. It doesn't show the grade of reinforing & concrete on the drawing.
So my question is, in 1929, what is the common reinforcing and concrete grade? (in MPa).
Thank you.
I am from Australia, I am doing a bridge rehabilitation project. The original design is from the Main Road Board in 1929. It doesn't show the grade of reinforing & concrete on the drawing.
So my question is, in 1929, what is the common reinforcing and concrete grade? (in MPa).
Thank you.






RE: Common strength of reinforcing & concrete in 1929
Concrete could be anything.
Sampling and testing would be very useful.
RE: Common strength of reinforcing & concrete in 1929
RE: Common strength of reinforcing & concrete in 1929
You may need to take some cores and have the concrete and steel tested if you can't otherwise establish the grades.
I have a few suggestions:
- Contact the Australian Concrete Repair Association
- Contact your local University's civil engineering department
- Perhaps a 'left-field' suggestion -- Contact your local division of Engineers Australia. They have a retired engineers group, which I'm sure would love a receive a query like this, and they're probably more likely to have an idea than current practitioners.
RE: Common strength of reinforcing & concrete in 1929
RE: Common strength of reinforcing & concrete in 1929
I've worked on several existing buildings constructed between 1900 and 1930's in central U.S. Most of the concrete strengths varied between 1500 psi to 2500 psi for cast-in-place concrete columns, beams and elevated slabs. Those values are based on compressive strength tests made using core samples from the existing concrete. Rebar configurations varied considerably. Smooth round bars. Round bars with deformations. Square bars with and without deformations. Stranded wires. I found a one-way slab that was reinforced with what appeared to be barbed wire. Fy for the bars tested varied from approx. 20 ksi to 40 ksi. Don't know if this helps.
RE: Common strength of reinforcing & concrete in 1929