Concrete is the most widely used man-made construction material in the work is second only to water as the most utilized substance, on the planet. It is obtained by mixing cementing materials water, aggregate, and sometimes admixtures in the required proportion. The mixture when placed in forms & allowed to come harden into a rock-like mass known as concrete. The hardening is caused by chemical reactions between water and cement & it continues for a long time & consequently the concrete grow stronger with age.

What is concrete? - Ingredient of concrete?

Strength, durability & other characteristics of concrete depend on the properties of its ingredients on the proportion of mix the method of composition, after control during placing. Compaction & curing. The popularity of concrete is due to the fact that from the common ingredients. It is possible to tailor the properties of concrete to meet the depends on any particular situation.

Ingredient of concrete?

Key to producing by strong, durable & uniform concrete that is the high performance by strong, durable & uniform concrete i.e, high-performance concrete lies in careful of it’s basic & processed components. These are the following ingredients:-

Cement

It is the most widely used cementing ingredient in present-day concrete that consists of compounds Ca, Si, Al, Fe & O2. It is an extremely ground material having adhesive properties which provide a binding medium for the discrete ingredients, identification of the major complex compounds is largely based on bojuis work & these are called bojuis compounds.
 
Bojuis compounds: -

S.N.

NAME

CHEMICAL FORMULA

PERCENTAGE

1.

Tri calcium silicate(C3S)

3CaO.SiO2

30 – 50

2.

Dicalcium silicate (C2S)

2CaO.SiO2

20 – 45

3.

Tri calcium aluminate (C3A)

3CaO.Al2O3

8 – 12

4.

Tetra calcium aluminate ferrite (C4A)

4CaO.Al2O3.Fe2O3

6 – 10

   

S.N.

CONSTITUTES

PERCENTAGE

AVERAGE

1

Lime (CaO)

62 – 67 %

63

2

Silica (SiO2)

17 – 25 %

20

3

Aluminum (Al2O3)

3 – 8 %

6

4

Iron oxide (Fe2O3)

0.5 – 6 %

3

5

Magnesium oxide (MgO)

0.1 – 4 %

2

6

Sulfate trioxide (So3)

1 – 3 %

1.5

7

Soda & potash (Na2O + K2O)

0.5 - 1.3 %

1



Aggregate

these are mainly naturally granular materials such as sand, gravel, crushed stone. However, technology is the use of recycled material & synthetic products.

Type of aggregate:

Coarse aggregate

What is concrete? - Ingredient of concrete? types of aggregate - coarse aggregate

Fine aggregate

what is concrete - ingredient of concrete - types of aggregate - fine aggregate

Water

water content, minerals & chemicals dissolved in it are achieving quality concrete.

What is concrete? - Ingredient of concrete?


Chemical admixtures

These are the ingredients in concretes other than Portland cement, water, and aggregate that are added to the mixture immediately before or during mixing to reduce the water required to accelerate or improve specific durability characteristics.

Supplementary cementing material

It is also called mineral additive, it contributes to the properties of hardening concrete through hydraulic or pozzolanic activity. Typical engineering of natural pozzolanic is fly ash, silica fumes.