(1) Concrete used in walls, piers and columns, and in foundations for them, shall except where otherwise specified, be made, placed and cured in accordance with the requirements of the appropriate Central African, and, in addition, shall comply with requirements of the of the following subsections.

(2) Normal concrete, other than light-mass concrete used in the construction of load-bearing members, shall be mixed in the proportions of one part of cement to not more than nine parts in all, when measured by volume and counted separately before mixed, of fine and coarse aggregate, and such concrete used in the construction of non-load-bearing members shall be mixed in the proportions of one part of cement to not more than than twelve parts in all of fine and coarse aggregate, measured in the same way.

(3) Light-mass concrete and no-fines concrete used in bearing-walls shall be made, placed and cured in accordance with the requirements for controlled concrete in Chapter 3.

(4) When tested in accordance with the provisions of Chapter 3, the various classes of concrete shall have a cube strength at an age of 28 days of not less than the following-

a) normal concrete, with ordinary aggregate-

i) for load-bearing members, 14 mega pascals;

ii) for non-load-bearing members, 7 mega pascals;

b) light-mass normal concrete, 3,5 mega pascals;

c) no-fines concrete employing ordinary aggregate, 2,45 mega pascals;

d) no-fines concrete employing light-mass aggregate, 1,75 mega pascals.

1Note that further requirements are set out as follows-
for reinforced-concrete walls and columns, in section 74;
for reinforced-concrete lintels, in section 18;
for unreinforced-concrete walls, in sections 61, 62 and 70.