B 14
[Subsidiary]
L.N. 294/76. L.N. 95/78.
Concrete.
CAP. 123] Building (Construction) Regulations
[1985 Ed.
(3) Notwithstanding paragraph (2) but subject to paragraph (2)(d)(ii), aggregate for reinforced concrete shall conform with the appropriate provisions of B.S. 882: Part 2:1973:
Provided that fine aggregate of grading zone 4 as given in Table II of B.S. 882:Part 2:1973 may be used only in special and designed concrete mixes.
19. (1) Concrete shall be composed of aggregate mixed with cement and water.
(2) The fine aggregate and coarse aggregate shall be measured separately.
(3) The proportions of cement to aggregate shall be those specified in Tables IV, V and VI for the appropriate grade of concrete:
Provided that-
(a) the use of any admixture shall be subject to the approval of the Building Authority:
(b) where the Building Authority approves the use of a cement under regulation 10(d) the proportions of cement to aggregate shall be those approved by the Building Authority:
and
(c) where the Building Authority is of the opinion that in any particular case other proportions will produce a suitable grade of concrete, he may permit such proportions for that case.
(4) (a) Concrete designated as Grades I-V in column 1 of Table IV and having the resistance to crushing specified for such grades in the last column of that Table shall be known as "ordinary" concrete.
(b) Concrete designated as Grades IA-IIIA in column 1 of Table V and having the resistance to crushing specified for such grades in the last column of that Table shall be known as "Quality A" concrete.
(5) The quantity of water used for making concrete shall not exceed that required to ensure that the concrete is uniformly mixed, can be readily placed and worked into position, and will make a sound concrete.
(6) Concrete shall-
(a) be deposited before setting has commenced and without segregation of the materials:
(b) be adequately consolidated by tamping or any other means, including vibrating, approved by the Building Authority: