Prefabricated RCC lintels can be used conveniently over windows, door openings and passage openings. Precast lintels indirectly accelerate the speed of construction as the curing period is eliminated.
Precast RCC lintels are preferred for small spaces up to 2 m (Fig. 9.3) and they are usually cast in wooden moulds and cured well in advance. While laying a precast lintel case care has to be taken to see that the marked face of the lintel is on the top or upper side. All pre-cast lintels are marked with tar or paint at the top so as to distinguish them from the bottom. This is essential, otherwise the position of reinforcement is reversed, which causes structural failure.
Figure 9.3 Cross-section of a precast concrete lintel
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