civil-structural-engineer: October 2015

Tuesday, 13 October 2015

CONCRETE FLOOR SLAB CONSTRUCTION

As general guide-lines the following items are important for successful execution of the concrete ground floor slab

The specification should give clear and precise requirement.

The floor shall be designed to carry specified loading with adequate factor of safety.

The selected contractor shall be experienced with good track records and with available resources to tackle the execution of the job.

Design, drawings and materials specified will be important. The type of concrete and the floor with
joints and isolation details or not to be defined clearly.

Study of sub-soil condition and water proofing requirement to be ensured.

Preparation of well compacted sub-grade and the built-up sub-base layers is important. The layer
underlying the concrete slab should have provision to reduce frictional resistance to concrete slab.

Shrinkage reducing admixture may be required.

The amount of fibres should be minimized to control water demand and cement content and
subsequently shrinkage.

Control on concrete mix design and proper supervision will be very important.

Effects of microfibres on concrete properties

Effects of microfibres on concrete properties

1. Increases homogeneity of the mix, stabilizing the movement of solid particles and blocking bleed

water channels.

2. Helps controlling plastic settlement of concrete.

3. Will increase the early age tensile strain capacity of plastic concrete and will restrict the development of plastic shrinkage and drying shrinkage cracks.

4.Will enhance the bahaviour of joints within the concrete.

5.Will improve the surface layer of concrete and thus improves abrasion resistance.

6.Will be effective in distributing impact stresses and delays deterioration.