In this type of floors, to reduce the total weight of the floor hollow blocks of clay or concrete are used. In one type, the blocks are placed at 10 cm apart and in this space, mild steel bars are placed (Fig. 23.11). Suitable flooring at top and ceiling finish are provided. In order to develop enough bond with the concrete, the blocks are provided with rough or grooved surface.
Figure 23.11 Hollow block and rib floor
The structural hollow clay floor tiles should be free from cracks and of uniform colour and texture. Projections of tiles are kept on one of the external face of such tiles so as to facilitate the application of plaster. The dimensions of length, 45–90 cm, width, 19–24 cm and height 70–90 mm. The weight per metre length of structural hollow clay tiles does not exceed 140 N.
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