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Concrete floor slab construction process includes erection of formwork, placement of reinforcement, pouring, compacting and finishing concrete and lastly removal of formwork and curing of physical slab.

Contents:

  • Concrete Floor Slab Construction Process
    • one. Get together and Erect Formwork for Slab
    • 2. Prepare and Identify Reinforcement for Slab
    • 3. Pour, Compact and Finishing Concrete Floor Slab
    • 4. Curing Concrete and Remove Formwork

Concrete Floor Slab Structure Process

  1. Get together and Erect Formwork
  2. Gear up and Place Reinforcement
  3. Cascade, Meaty and Stop Concrete
  4. Curing Concrete and Remove Formwork

1. Get together and Cock Formwork for Slab

The formwork shall be designed to withstand construction loads such as fresh concrete pressure and weight of workers and operators and their machines. Guide to Formwork for Physical ACI 347-04 shall exist followed for the design of formworks. Moreover, there are various construction aspects that demand to be considered during the erection of formworks. For example, it should exist positioned correctly, lined and levelled, joints sealed adequately, and forestall protruding of nails into the concrete etc... Furthermore, different materials such equally forest, steel, and aluminum can be used for the formworks of concrete floor slab.

Concrete Floor Slab Formwork

Fig. i: Physical Flooring Slab Formwork

Finally, at that place are several mutual formwork construction deficiencies that site engineer needs to be enlightened of and prevent their occurrence otherwise formwork failure may occur. These construction deficiencies are provided beneath:

  • Poor or lack of formwork examination during and after concrete placement to identify uncommon deflections or other indications of possible failure that could be corrected
  • Inadequate nailing, bolting, welding, or fastening
  • Improper lateral bracing
  • Construct formwork that does not comply with form drawings
  • Lack of proper field inspection to ensure that grade design has been properly interpreted by form builders
  • Use of damaged or junior lumber having lower force than needed.

Besides Read: Formwork (Shuttering) for Different Structural Members -Beams, Slabs, Columns, Footings

2. Fix and Place Reinforcement for Slab

Prior to the placement of reinforcement for concrete floor slab structure, inspect and check forms to confirm that the dimensions and the location of the physical members conform to the structural plans. Added to that, the forms shall be properly cleaned and oiled but not in such corporeality every bit to run onto bars or concrete construction joints. Design drawings provides necessary reinforcement details, so information technology but needs understanding to use designated bar size, cut required length, and make necessary hooks and bents. After preparation is completed, steel bars are placed into their positions with the provision of specified spacings and concrete embrace. The physical encompass and spacing for floor slabs can be maintained by introducing spacers and bars supporters. Wires are used to tie master reinforcement and shrinkage and temperature reinforcement (distribution reinforcement).

wires used to tie reinforcement and supporters used to maintain concrete cover

Fig. two: wires used to tie reinforcement and supporters used to maintain concrete cover

Information technology should be known that incorrect reinforcing steel placement tin lead to serious concrete structural failures. Improper concrete cover exposes reinforcement confined to danger and jeopardize concrete-steel bail. Finally, after all requirements of reinforcement placements (positions, concrete embrace, spacing, and right confined size; length; hooks; and bending) are finalized, then site engineer tin can social club concreting.

Provision of concrete cover for reinforcement bars in slab

Fig. 3: Provision of concrete embrace for reinforcement bars in slab

Too Read: Reinforcement Detailing of Reinforced Concrete Slabs

iii. Pour, Compact and Finishing Concrete Floor Slab

Mixing, transporting, and treatment of concrete shall be properly coordinated with placing and finishing works. In floor slab, brainstorm concrete placing along the perimeter at ane end of the piece of work with each batch placed against previously dispatched physical.

Concrete placement started from one end of the slab

Fig. four: Concrete placement started from one stop of the slab

Concrete should be deposited at, or as close every bit possible to, its last position in gild to prevent segregation. So, Concrete placement in large and dissever piles, then moving them horizontally into final position shall be prevented. Moreover, site engineer shall monitor concreting properly, and await for signs of problems. For instance, loss of grout is the indication of improper sealing and motility of joints. Added to that, cracking, excessive deflection, level and plumb, and any movement shall be checked and tackled to foreclose further problems.

Concrete placement using pumps

Fig. 5: Concrete placement using pumps

Furthermore, fresh physical should be compacted adequately in order to mold it inside the forms and effectually embedded items and reinforcement and to eliminate rock pockets, honeycomb, and entrapped air. Vibration, either internal or external, is the virtually widely used method for consolidating concrete. Lastly, slabs could exist finished in many ways based on flooring awarding. Helpful information nearly forms before, during, and later concreting can be constitute in ACI 311.1R.

Placing and vibrating fresh concrete

Fig. vi: Placing and vibrating fresh physical

Also Read: Methods of Finishing Hardened Concrete Surface

4. Curing Physical and Remove Formwork

After finishing concluded, suitable technique shall exist used to cure the concrete fairly. Slab curing methods such as water cure; concrete is flooded; ponded; or mist sprayed. In improver to water retaining method in which coverings such as sand; canvas; burlap; or straw used to kept slab surface wet continuously, chemical Membranes,and waterproof paper or plastic film seal. Regarding curing, it is recommended to remove formworks afterwards xiv days. For detailed formwork removal time, Please click hither.

Curing concrete slab by ponding

Fig. 7: Curing concrete slab by ponding

All structure process of physical floor slab are illustrated in Fig.8 and Fig.9.

Illustration of reinforced concrete slab construction

Fig. eight: Illustration of reinforced concrete slab construction

Wire used to bind main and shrinkage and temperature reinforcement

Fig. 9: Wire used to demark main and shrinkage and temperature reinforcement (Detail 'A')

Also Read: Methods of Curing Physical Structures and their Comparisons