Basic differences among RC slab and RB slab

RC Slab: RC Slab stands for a horizontal structural component of steel reinforced concrete. Generally, the thickness of RC slab varies from 100mm to 500mm. RC Slabs are frequently applied as floorings, ceilings etc. Slabs are supported on two sides only or contain beams on all four sides.

RC slabs are erected with formwork, that is generally created with wooden planks, boards, plastic & steel. In recent times, prefabricated RC slabs are also utilized. RC Slab is also termed as Reinforced Concrete Slab that arranges reinforcement for retaining the strength of the structure. Straight bar and alternative cranked bars are also applied as reinforcement in the RC slabs.

RB slabs: RB slab stands for a reinforced brick slab that is suitable for floorings and ceilings. RB slab is erected with steel reinforcement arranging spacing with the bricks. The construction cost of RB slab is less with regard to RC slab.

An RC slab alias Reinforced Cement slab is found in buildings and in bridge construction. The reinforcement is provided with steel bars which are arranged with some distances according to design and based on the load the slab has to undergo.

An RB slab alias Reinforced Brick slab is ideal for roofs in buildings. It is less costly as compared to RC slabs. The reinforcement is provided with steel bars which are arranged with some distances according to design and based on the load the slab has to undergo.

The distance among the bars is occupied by bricks which are arranged on its edge. The depth of the slab remains 4.5 in. The bars are provided among the bricks in both directions. The cement-sand mortar along with least possible water quantity is used to fill up the distance among the bars.

As bricks are permeable, the slab should be plastered with cement-sand plaster having a water-proofing compound added on the upper surface. On the bottom part of the slab, the plaster should be done with a cement-sand plaster for superior look.

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Published By
Rajib Dey
www.constructioncost.co
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Clear Cover and Nominal Cover used for RCC Structure

The concept of Clear cover and nominal cover is seen in the Reinforced concrete structures.

Reinforced concrete structures have been main structural materials for over a century and still the most popular material for public structures all over the world. The concrete structure is durable enough to keep its shape for a long time.

The reinforced concrete structure refers to the members like beams, boards, columns, and roof trusses etc. which are consisted of concrete and steel bars.

In these structures, the steel bars are covered by concrete but their mechanical properties will still lose due to the fire to destroy the whole structure.

In this design of reinforced concrete structures, the provided reinforced is inserted in the concrete upto a particular distance from the face of the member as there are some reasons.

The reasons are discussed below:

• It will provide protection to reinforcement from erosion
• It will also provide fire resilience to reinforcement.
​• It will also supply sufficient embedded depth so that reinforcement grows the requisite stress.

This distance is measured in various ways and known by different names like:

• Clear cover: This is the difference from the face of the member to the outermost face of the reinforcement including shear or torsion Stirrups or links.
• Nominal cover: This cover is like the same as Clear Cover although it has different name; actually the name is a term that is used by the code. It is the distance measured from the face of the member to the outermost face of the reinforcement including Stirrups or links.

To get information on other clear cover and nominal cover, go through this useful civil engineering video tutorial.

Video Source: CE&T-Civil Engg & Technology

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Published By
Rajib Dey
www.constructioncost.co
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