Types of reinforcement & types of concrete and ther uses
The following types of reinforcements are common in RCC building
Given below, the detail information of these products :-
Fiber-reinforcement concrete alias FRC is produced with the inclusion of discrete reinforcing fibers made of steel, glass, synthetic (nylon, polyester and polypropylene) and natural fiber materials.
Also read : GUIDELINES FOR QUALITY CONTROL OF CONCRETE
Synthetic fibers are supplied to the mixing system in preweighed, decomposable bags which are crushed throughout the mixing cycle. Steel fibers are provided to the rotating mixer through conveyor belt, either at the same time like the coarse aggregate once all the common materials are combined.
The fiber reinforcement concrete is frequently utilized in slab-on-grade construction, precast concrete and shotcrete.
Slab-on-grade construction ranges from airport runways, residential, commercial and industrial floor slabs and hydraulic structures.
Fiber-reinforcement shotcrete is suitable for rock slope stability, tunnel liners, hydraulic structures and preservation of prevailing concrete.
FRC is also applied in repair applications like repair of bridge decks, piers and parapets.
- Deformed steel bars - These types of bars are round steel bars containing lugs, or deformations which are rolled into the surface of the bar all through manufacturing.
- Threaded steel bars - Threaded steel bars are manufactured with various grades. They are applied as a substitute to lapping standard deformed bars while long bar lengths are necessary.
- Welded wire fabric - Welded wire fabric reinforcement alias welded wire reinforcement refers to a square or rectangular mesh of wires.
Types of concrete
- To withstand inward pressures in circular structures like tank, pipe.
- To control cracking in bridge decks and slab-on-grade.
- To enhance the strength of columns and piles.
- To minimize long-term deflections.
- Plain concrete is structural concrete devoid of reinforcement.
- It is often utilized in slabs-on-grade, pavement, basement walls, small foundations and curb-and-gutter.
- Pretensioning is normally done in a factory (or precasting yard). The tendons are retained in place and tensioned against the ends of the casting bed prior to placement of concrete.
- In pretensioned concrete, the tendons are attached with concrete over their entire length.
- Post-tensioning is usually done at the job site. Post-tensioning tendons are normally internal but sometimes they are external.
- In post-tensioning, no large temporary anchorages are necessary.
Reinforced Cement Concrete (RCC)
- Cement : Sand : Crush
- 1 : 1.5 : 3
- 1 : 2 : 4
- 1 : 4 : 8
Water Cement Ratio (W/C)
- W/C = 0.5 - 0.6
- For a mix ratio of 1:2:4 and W/C = 0.5, when cement is 50 kg
- Sand = 2 x 50 = 100 Kg
- Crush = 4 x 50 = 200 Kg
- Water = 50 x 0.5 = 25 Kg
- Batching is done by weight