Hong Kong Regulations

BUILDING (CONSTRUCTION) REGULATIONS - REGULATION 60

Concrete for minor structural and non-structural works

Prescribed mix concrete

(1) Concrete may be a prescribed mix concrete as an alternative to designed
mix concrete when it is used in minor structural or non-structural works.

(2) Prescribed mix concrete shall be denoted by the specified grade strength
in MPa with the suffix P.

(3) Prescribed mix concrete shall be made using mix proportions, batching by
weight, selected from Table 9 depending on its intended use.

(4) Prescribed mix concrete shall comply with regulations 51, 52, 54, 61 and
62.

(5) The cement used in prescribed mix concrete shall be ordinary Portland
cement.

TABLE 9

PRESCRIBED MIX CONCRETE

Weight of aggregate per bag of cement kg

Specified grade strength
Material 45 kg bag of cement 50 kg bag of cement
Fine aggregate 145 160 10 P 20 mm coarse aggregate 185 205
Fine aggregate 120 130 15 P 20 mm coarse aggregate 165 180
Fine aggregate 95 105 20 P 20 mm coarse aggregate 145 160 (Enacted 1990)