The Constructor

Reinforced Concrete Slab Casting- Work Procedure

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Casting concrete slab is considerably crucial task in building construction and requires great planning and accuracy, in addition to proper execution sequence. This article presents proper procedure on how to prepare and cast reinforced concrete slab.

Materials and Machinery for Slab Casting

Slab Pre-concreting Checks

There are many checks that need to be performed prior to concreting of reinforced concrete slab:

Checking Slab Formwork

Checking Slab Reinforcement

Other pre-concreting checks

Slab Concreting Work Procedure 

1. Providing Construction Joint

The construction joint shall be pre-decided and fixed prior to start of the concreting. It is planned to have two construction joints for main building as decided. In case of major break down of the Batching plant, the additional Construction joint may be left. The location of the construction joint shall be at the one-third span. Construction joint shall be straight and have profile of ‘L’shape so that successive layer of concrete shall be perfectly bonded with previous laid layer. Preparation of construction joint shall include roughening, removing all laitance adhering to the joint and application of thick slurry before start of the new concrete.

Fig. 3: Construction joint in slab

2. Production of Concrete

Stock of material shall be sufficient to start the concrete. It shall be ensured by stores/purchase dept that concreting is not stopped on account of materials. All plant and machinery are checked and made in working conditions.

3. Concrete Pouring

4. Finishing Concrete Surface 

5. Curing Concrete

The curing shall be started immediately after thumb set of the concrete laid. Hessian clothe /Plastic shall be covered over the set concrete to reduce moisture evaporation from the concrete during hardening and thus to minimize shrinkage crazy cracks. These cracks are inheriting property of the concrete specially appears during casting of flat surfaces. Final curing shall be done by ponding and stacking water for minimum period of 7 days.

Fig. 6: Curing concrete slab by ponding

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