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Guide to the selection of designated and standard mixes
Extract from BS5328 Part 1, Table 13

Application

Designated
mix

Standard
mix

Recommended workability
(nominal slump)

Foundations

Blinding and mass concrete fill

GEN 1

ST2

75

Strip footings

GEN 1

ST2

75

Mass concrete foundations

GEN 1

ST2

75

Trench fill foundations

GEN 1

ST2

125

General applications

Kerb bedding and barking

GEN 0

ST1

Very low (nominal 10)

Drainage works to give immediate support

GEN 1

ST2

Very low (nominal 10)

Other drainage works

GEN 1

ST2

50

Oversite below suspended slabs

GEN 1

ST2

75

Floors

House floors with no embedded metal (see note 1 of
5.3.3 of BS 5328: Part 2: 1997):
- Permanent finish to be added, e.g. a screed or floating floor

GEN 1

ST2

75

- No permanent finish to be added, e.g. carpeted

GEN 2

ST3

75

Garage floors with no embedded metal

GEN 3

ST4

75

Wearing surface: light foot and trolley traffic

RC 30

ST4

50

Wearing surface: general industrial

RC 40

N/A

50

Wearing surface: heavy industrial

RC 50

N/A

50