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Such concrete units are called as the precast concrete.

The examples of precast concrete units are concrete blocks, the staircase units, precast walls and poles, concrete lintels and many other elements.

Once the concrete sets and harden, the structural unit will be put in compression.

This phenomenon of prestressing will make the lower section of the concrete member to be stronger against the tension.

The normal strength concrete has an initial setting time of 30 to 90 minutes that is dependent on the cement properties and the weather conditions of the construction site.

The plain concrete will have no reinforcement in it.

Also Read: Applications of High Density Radiation Shielding Concrete in Construction These are concrete types into which air is intentionally entrained for an amount of 3 to 6% of the concrete.

These units have the advantage of acquiring speedy construction as only assemblage is necessary.

As the manufacturing is done at site, quality is assured.

Different types of concrete are produced based on the constituent material, mix design, the method of construction, area of application, form of hydration reaction.

Details of these various types of concrete, their properties and applications are discussed.

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