Minimum spacing between reinforcement bars
The distance between reinforcement bars must be such to allow the largest expected concrete size gravel to pass between them. In order to have properly anchored reinforcement, it is mandatory for rebars to be surrounded by concrete. The minimum spacing between two reinforcement bars should be at least equal to the maximum coarse aggregate dimension plus a margin of 5 mm.
Example of minimum spacing between reinforcement bars in beams
These spacing requirements are easily met in slabs and columns. However, in beams, extra care must be paid mainly at the support and at the joint areas.
Examples of efficient concrete casting in beams
The problem in beams is related to the concrete’s casting and it can be dealt with three different ways or in certain cases with a combination of them.
Minimum spacing between reinforcement bars in foundation tie-beams
Concrete casting in foundation tie-beams is not an easy procedure. These beams are not fixed together with a slab as are superstructure beams; consequently concrete has to be poured down the beam’s narrow top opening and reach the bottom of the beam.
Because of the fact that tie-beams normally have a considerable height and therefore dispose of a large internal lever, it is preferable to place rebars in two or even three layers along with their height.
Loading related articles...
Loading recent articles...
Loading featured articles...
