General

P(1) The rules given in this Chapter apply to all reinforcement, mesh and prestressing tendons, subjected to predominantly static loading; they do not apply to:

— lightweight aggregate concrete

— dynamic loading.

(2) For lightweight aggregate concrete, supplementary rules are given in Part 1C.

(3) For structures subjected to fatigue loading, see Part 1E.

P(4) The requirements concerning minimum concrete cover shall be satisfied (4.1.3.3).

5.2 Steel for reinforced concrete 5.2.1 General detailing arrangements 5.2.1.1 Spacing of bars

P(1) The spacing of bars shall be such that the concrete can be placed and compacted satisfactorily and that the development of adequate bond is assured.

(2) The maximum aggregate size, dg, should be chosen to permit adequate compaction of the concrete round the bars.

(3) The clear distance (horizontal and vertical) between individual parallel bars or horizontal layers of parallel bars should be not less than the | maximum bar diameter or 20 mm |. In addition where dg > 32 mm, these distances should be not less than dg + 5 mm.

(4) Where bars are positioned in separate horizontal layers, the bars in each layer should be located vertically above each other and the space between the resulting columns of bars should permit the passage of an internal vibrator.

(5) Lapped bars may touch one another within the lap length.

5.2.1.2 Permissible curvatures

P(1) The minimum diameter to which a bar is bent shall be such as to avoid crushing or splitting of the concrete inside the bend of the bar, and to avoid bending cracks in the bar.

(2) For bars or wires, the minimum diameter of the mandrel used should be not less than the values given in Table 5.1

Table 5.1 — Minimum diameters of mandrels
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