50 N/mm 2 at 7 days. o Failure rate of 2% o Previous control data yielded a standard deviation of 5 N/mm 2 o CEM-I 52.5 o Air-entraining is not required o Required slump 120 mm
Working on major construction project that requires considerable amounts of concrete to be used,
you are asked to design a concrete mix following the BRE methodology. The concrete mix
specifications are:
o Characteristic compressive strength of 50 N/mm 2 at 7 days.
o Failure rate of 2%
o Previous control data yielded a standard deviation of 5 N/mm 2
o CEM-I 52.5
o Air-entraining is not required
o Required slump 120 mm
o Coarse aggregate: Crushed maximum size 10mm
o Fine aggregate: Uncrushed with 45% passing 600 μm sieve
o Relative density of aggregates: 2.7
o Coarse aggregate has 4% moisture
o Fine aggregate is dry and has 1.2% absorption.
o Volume of the required trial mix: 0.120 m3
Create the mix design and state what actions and recommenations you would do if trial produced a result with a mean compressive strength of 64 MPa at 7 days and the slump was 80mm.
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