Understanding towards Concrete..

Now, let us take a look at some example of Concrete Buildings/Structures

The Parthenon 447 and 438 B.C. (Europe, Greece)

The Colosseum (Rome,Italy)

Basic desired properties that we should know:

-          Good workability

-          High Strength and hardness

-          Adequate durability

-          Economy

Factors that affect the setting of concrete.

-          Water Cement ratio

-          Suitable Temperature

-          Cement content

-          Type of Cement

-          Fineness of Cement

-          Relative Humidity

-          Admixtures

-          Type and amount of Aggregate

Workability

The ability of a fresh (plastic) concrete mix to fill the form/mold properly with the desired work (vibration) and without reducing the concrete’s quality.

Higher workability concretes are easier to mix, transport (especially, place and compact. Higher workability of concrete can be achieved by one or a combination of the following:

1. Use of a well graded aggregate.

2. Use of smooth and well rounded, rather than irregularly shaped aggregate.

3. Use of air-entraining admixtures.

4. Use of plasticizers and superplasticisers.

5. Higher water/cement ratio.


Workability Test


1. Slump Test








2. Compacting Factor Test


 



3.Vebe Test





4.Flow Table Test