oa Civil Engineering = Siviele Ingenieurswese - Methods and trends in concrete mix design

Volume 8, Issue 12
  • ISSN : 1021-2000



The type of specification for the concrete used on the construction of the Auckland Harbour bridge and approaches illustrates the trends of mix design becoming usual in Great Britain. Various classes of concrete are used in different parts of the work and these are specified by their minimum 28-day strength on work's tests made on 12 in. by 6 in. diameter cylinders. The use of 12 in. by 6 in. diameter cylinders is standard in New Zealand as opposed to the 6 in. cubes used in Great Britain. These strengths vary from 4,500 lb/sq.in. for reinforced concrete to 2,000 lb/sq.in. for the haunchil1g of roadway kerbs.

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