estimate the water content of the mix estimate the content of aggregates, provide the estimated mix quantities

Structural Analysis
6th Edition
ISBN:9781337630931
Author:KASSIMALI, Aslam.
Publisher:KASSIMALI, Aslam.
Chapter2: Loads On Structures
Section: Chapter Questions
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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. 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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