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 1% 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 50 mm o Maximum cement content is 550 kg/m 3 o Coarse aggregate: Uncrushed maximum size 10mm o Fine aggregate: Uncrushed with 45% passing 600 μm sieve o Relative density of aggregates: 2.7 o Assume both types of aggregate as SSD. Proceed with the concrete mix design methodology and comment on any implications during this process.
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 1% 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 50 mm o Maximum cement content is 550 kg/m 3 o Coarse aggregate: Uncrushed maximum size 10mm o Fine aggregate: Uncrushed with 45% passing 600 μm sieve o Relative density of aggregates: 2.7 o Assume both types of aggregate as SSD. Proceed with the concrete mix design methodology and comment on any implications during this process.
Chapter2: Loads On Structures
Section: Chapter Questions
Problem 1P
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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 1%
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 50 mm
o Maximum cement content is 550 kg/m 3
o Coarse aggregate: Uncrushed maximum size 10mm
o Fine aggregate: Uncrushed with 45% passing 600 μm sieve
o Relative density of aggregates: 2.7
o Assume both types of aggregate as SSD.
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 1%
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 50 mm
o Maximum cement content is 550 kg/m 3
o Coarse aggregate: Uncrushed maximum size 10mm
o Fine aggregate: Uncrushed with 45% passing 600 μm sieve
o Relative density of aggregates: 2.7
o Assume both types of aggregate as SSD.
Proceed with the concrete mix design methodology and comment on any implications during this
process.
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