The proportion of concrete ingredients given in the "Standard mixes for ordinary Structural Concrete" of this Specification or proportions obtained by tests shall be used for concrete mixing.
The proportion of ingredients shall be such as to produce a mixture, which will work readily into the corners and angles of the forms and around reinforcement with out segregation of the material components. Where the proportion of ingredients given in the Concrete Class Section of the Specification is not applicable, trial batches shall be made and the mix from which the desired strength is established by testing shall be used for the works.
