Slab and it's types,.......................

In this presentation you we let you know one structural member that is slab and it's types

1. Slab And Its Types Presented by Mohammed Aziz Uddin 160923741026 M.E - Structures Under the Guidance of Mr.Venkatesh Assistant Professor Lords Institute of Engineering and Technology Department of Civil Engineering

2. Defination Slab – The Slab is the horizontal structural member which is used to form floors, roof decks and ceilings. It is made up of concrete or reinforced cement concrete. The slab is working as roof when placed at the top of the structure, the roof or the slab is supported by columns, beams and walls. Usually, reinforced concrete slab and beam cast monolithically in the structure.

3. Introduction What is Slab? • Slab is a thin concreted flat structure mostly used for flooring purpose. • It can be square, rectangular, circular in shape. • Slabs can be used in making floors, ceilings and some sometimes paving too. • Thickness of a slab varies from 4 to 6 inches. • 4 inches thick slab will be used where there is light load on the floor (dead and live) • Whereas 6 inches thick slab is used where there is quite heavy load on the floor • Slabs are mostly known as RCC slabs that means Reinforcement Cement and Concrete Slabs. • Materials which are used to make RCC slabs are: Cement, Course aggregate, fine aggregates and reinforcement bars.

4. T ypes of Slabs There are different types of concrete slab which are used in construction. Some are outdated and some are used nowadays. We are discussing in detail as follows, 1. Flat Slab 2. Flat Plates 3. Conventional Slab i )One Way Slab ii)Two Way Slab 4. Hallow Core Slab 5. Sunken Slab 6. Dome Slab 7. Pitch Roof Slab 8. Slab With Arches 9. Post Tension Slab 10. Pre-Tension Slab

5. Flat Slab Flat Slab is the simplest type of slab use in construction of slab, in which slab is constructed on column or column cap without the use of beam. This slab is easy to construct it is economical because it requires less formwork. Due to absence of beam the slab also called as beam less plate. The thickness of slab is more than other type of slab. The floor to floor height is minimized by the slab construction, which makes structure’s view pleasant. The flat slab specially used at the location where no need of beam for making pleasant look of structure such as restaurant, hall, business houses, parking deck, etc.

6. Conventional Slab The Conventional Slab is placed on beams and columns. The thickness of the conventional slab is small i.e. 4” or 10 cm. In conventional slab beam and column carry and transferred load to the foundation so the depth of beam is large. The conventional slab consist of reinforcement, the bars which are placed horizontal in slab is called main reinforcement bars and the bars which are placed vertical in slab is called distribution bars. According to length and width of the conventional slab, it again divided into two types as follows, 1. One Way Slab 2. Two Way Slab

7. 1.One Way Slab One Way Slabs carry load along one direction which is supported by beam on two opposite sides. The condition for one way slab is the ratio of longer span to shorter span of slab should be equal to and greater than 2. The main bars are placed along the shorter direction, and distribution bars are placed along longer direction and they are cranked to resist formation of stresses in slab.

8. 1.Two Way Slab Two-Way Slabs carry load along both direction and is supported by beams on all four sides. The condition for two-way slab is the ratio of longer span to shorter span of slab should be less than 2. The Distribution bars are provided in both directions, so the bars are cranked in both directions. The two-way slab requires more formworks. The slab is used for multistory buildings.

9. Sunken Slab The Sunken Slab is the slab which is provided below the washrooms to hide sewerage pipes or sewage pipes. The pipes which carry water are hidden below the floor. The floor is filled with coal or broken pieces of bricks, after casting the pipes. There are two types of sunken slab as follows, The slab which provide above normal floor level t height of 0.2m to 0.3m and the space is filled with the coal and broken pieces of bricks. The slab which provide below normal floor level t height of 0.2m to 0.3m and the space is filled with the coal and broken pieces of bricks

10. Dome Slab  Dome Slab is built on the conventional slab which is semi-circular in shape and mostly used in temples, palace, mosques, etc. Thickness of the slab is 150mm, which is a concrete slab.

11. Post Tension Slab The Post Tension Slab is tensioned after constructing a slab. To resist compression in slab, reinforcement is provided but in post tension slab cables or steel tendons are used. Post tension slab provide better structures with affordable price.

12. Hallow Core Slab Hallow Core Slab is the precast slab with cores or voids. The slabs require less concrete so the self weight of the slab is less. The voids or cores act like service ducts, like plumbing and electricity. The slab is casted where the fast constructions are required. With reducing the weight of structure, it reduces the cost of structure. It is suitable for car parking, multistory buildings, etc.

13. Queries