10mm aggregate size improves workability of the concrete,although aggregate size up to 20mmmay be used providing additional care is taken to ensure the larger sized aggregate does not restrict the flow of concrete.

Design strength of the concrete may vary depending upon the structural design and performance rquired.Specification of a pump grade mix serves to ensure that the formwork system will fill fully under the natural flow of the concrete and consequently vibration is not required to achieve adequate compaction.

Unless prohibited, a water reducing plasticiser may be added

* According to the engineer's specification: 
C25 is the standard specification. 
C35 is usual for basement construction.

For more details please see Technichal guide.

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