Clear cover of Concrete As per ACI Code

Clear Cover: Clear cover can be defined as the clear distance between the surface of the concrete and surface of the rebar.

Requirement of Clear Cover:

Clear cover is provided to protect the reinforcement from the phenomenon called corrosion and to provide fire resistance to bars embedded in concrete.

Clear Cover for  Different RCC Components:   

Clear Cover according to ACI 318 Code for plane concrete is-

Description	Clear Cover, inch
Concrete cast against and permanently exposed to earth	3
Concrete exposed to earth or weather: No. 06 through No.18 bar No.05 bar and wire	2  1.5
Concrete not exposed to weather or in contact with ground:  Slabs, walls, joists: No.14 and No.18 bars No. 11 bars and smaller	1.5  0.75
Beams, Column	1.5
Shells, folded plate members No.6 bars and larger No.05 bars and smaller	0.75  0.50

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Types of Pile Foundation 

Types of Pile Foundation can be classified based on (1) Material used (2) Mode of transfer of load (3) The use (4) Method of Installation (5) The Displacement of Soil.

1) Classification Based on Material Used:

   

    i)       Steel Piles

    ii)      Concrete Piles

    iii)     Timber Piles

    iv)     Composite Piles.

2) Classification Based on the Mode of transfer of Load:

    i)      End Bearing Piles

    ii)     Friction Piles

    iii)    Combined end bearing and Friction Piles.

3)Types of Pile Foundation Classified Based on The Use:

    i)      Load Bearing Piles

    ii)     Compaction Piles

    iii)    Tension Piles

    iv)    Sheet Piles

    v)     Fender Piles

    vi)    Anchor Piles.

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4) Classification based on Method of Installation:

    i)     Driven Piles

    ii)    Driven and Cast-in-Situ Piles

    iii)   Bored and cast-in-Situ Piles

    iv)   Jacked Piles

    v)    Screw Piles.

5) Classification based on the Displacement of soil:

    i)    Displacement Piles.

    ii)   Non-Displacement Piles.