estimate the water content of the mix estimate the content of aggregates, provide the estimated mix quantities
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. All the necessary tables for
this can be found in the Appendix. The concrete mix specifications are:
o Characteristic compressive strength of 35 N/mm 2 at 28 days.
o Failure rate of 2%
o Previous control data yielded a standard deviation of 10 N/mm 2
o CEM-I 42.5
o Air-entraining is not required
o Maximum water to cement ratio 0.40
o Minimum cement content 390 kg/m 3
o Required slump 50 mm
o Coarse aggregate: Crushed maximum size 20mm
o Fine aggregate: Uncrushed with 90% passing 600 μm sieve
o Relative density of aggregates: 2.5
o Coarse aggregate has 4% moisture
o Fine aggregate is dry and has 1.2% absorption.
o Volume of the required trial mix: 0.090 m 3
Following the BRE step-by-step process estimate the water content of the mix
estimate the content of aggregates, provide the estimated mix quantities
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