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Need help with Concrete Strength?
I'm working with a construction company for the summer and they have me looking through their old files for a project they did in 2001. They are specifically having me look for anything to do with waterproofing under a slab in case of hydrostatic pressure forcing water through cracks in the slab. Ive come across a file from the ready-mix plant for the concrete designs. My question to you is how strong is this concrete design?
-all ingredients are in KG/m³
-all admixture dosages are based upon Manufacturer's Recommendation.
-M.R.W.R. Denotes mid-range water reducer.
For the slabs the design was 35MPa 5-8% Air W/Co.38 M.R.W.R.
20mm STONE - 1120KG/m³
SAND - 700KG/m³
TYPE 10 CEMENT - 249KG/m³
CLASS C FLY ASH - 106KG/m³
WATER - 135KG/m³
WATER REDUCER (WRDA 20) - 675ml
AIR ENTRAINMENT - 90ml
MIDRANGE (DARACEM 50) - 1510ml
To determine the strength of a concrete mix design, you would have to mix a batch and make some cylinders. Then break the cylinders to determine the strength.
But... the mix design you listed says 35MPa, so in this case, the mix was probably designed to have a strength of 35Mpa (or 5000psi).
For typical foundation applications, 3000-4000psi concrete is the design strength. It is a good idea to specify a stronger mix for slabs, to help prevent cracking. So this is in the right ballpark.
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