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Bogues Compounds of Cement their Composition and Influence on Strength

In the cement manufacturing process, the calcareous and argillaceous are collected in the kiln in proper proportion and burnt at a temperature of about 1400°C to 1500°C, this burnt material is then ground to form clinker of diameter 2 to 3mm.

Now the required amount of gypsum and water is added to the clinker, the added water reacts with ingredients chemically and results in the formation of complex chemical compounds which were identified first time by R.H. Bogue’s so called as bogues compounds.

What is Bogue’s Compound of Cement?

When water is added to the cement it reacts with ingredients chemically and results in the formation of complex chemical compounds which were identified first time by R.H. Bogue’s so called as bogues compounds.

Basically there are four major bogues compounds namely Tricalcium Silicate, Dicalcium Silicate, Tricalcium Aluminate, and Tetracalcium Aluminoferrite.

Chemical Composition of Bogues Compounds of Cement

The following table shows chemical composition of bogues compounds with their formula and abbreviated name.

Name of CompoundNameFormulaAbbreviated FormulaPercentage
Tricalcium SilicateAlite3CaO.SiO2C3S25 to 50%
Dicalcium SilicateBelite2CaO.SiO2C2S20 to 45%
Tricalcium AluminateCelite3CaO.Al2O3C3A5 to 12%
Tetracalcium AluminoferriteFelite4CaO.Alf2O3.Fe2O3C4AF5 to 10%
Chemical Composition of Bogues Compound

As the chemical formulas of all the compounds are difficult to remember for simplicity abbreviated notations are used as shown in the table above like C- CaO, S- SiO2

1) Tricalcium Silicate

Following are the properties and uses of tricalcium silicate

  • Faster rate of reaction with water than C2S but less than C3A.
  • Develops early strength and hardness.
  • Develops high and early heat of hydration.
  • Generates 3x heat of hydration that of C2S.
  • It increases the resistance to freezing and thawing.
  • The faster rate of reaction with water results in immediate stiffness and flash strength.
  • It contributes in first 28 days strength and it is the only compound to do so.
  • The heat of hydration is 500J/gm.

2) Dicalcium Silicate

Following are the properties and uses of dicalcium silicate

  • The slower rate of reaction with water than C3S
  • Responsible for the development of ultimate strength.
  • Results in slow hardening.
  • Slow and less generation of heat of hydration.
  • Increasing C2S can cause reduced early strength.
  • It offers better resistance to chemical attack.
  • It contributes to strength from the 14th day to 1 year.
  • The heat of hydration 260J/gm.

Note: C3S and C2S contributesabout 70 to 80% of the cements overall strength.

3) Tricalcium Aluminate

Following are the properties and uses of tricalcium aluminate

  • It reacts with water at a very faster rate even faster than C3S.
  • Because of the faster reaction, it results in the flash setting of cement.
  • Hydrates very fast and has the highest heat of hydration as compared with all other compounds i.e. about 40% more heat than sulphates.
  • Contribution to strength is insignificant.
  • Cement with high C3A is susceptible to sulphate attack.
  • Weak resistance to chemical attack.
  • It contributes to 24 hours strength but in an insignificant amount.
  • It has the heat of hydration 865 J/gm

4) Tetracalcium Aluminoferrite

following are the properties and uses of tetracalcium aluminoferrite

  • It has a high heat of hydration as compared to C2S but less than C3A.
  • Contribution to strength is insignificant.
  • It contributes to 24 hours strength but in an insignificant amount.
  • The heat of hydration 420J/gm.

Note: C3A and C4AF hydrates rapidly but contribution to strength is insignificant.

What is the Bogues Equation?

Bogue’s equations are suggestions by bogue to calculate the percentage of all four bogues compounds. Bogues equations to calculate the percentage composition of bogues compounds are given below

C3S = 4.07 (CaO) – 7.60 (SiO2) – 6.72 (Al2O3) – 1.43 (Fe2O3) – 2.85 (SO3)

C2S = 2.87 (SiO2) – 0.754 (3CaO.SiO2)

C3A = 2.65 (Al2O3) – 0.754 (Fe2O3)

C4AF = 3.04 (Fe2O3)

The oxides inside the brackets represent the percentage composition of the same in the raw materials.

Video Explanation on Bogues Compounds of Cement

FAQs on Bogues Compounds of Cement

What is the decreasing order of contribution to strength of portland cement compounds?

C3S > C2S > C3A > C4AF

What is the decreasing order of heat of hydration of portland cement compounds?

C3A > C3S > C4AF > C2S

What is the decreasing order of Rate of Reaction of portland cement compounds?

C3A > C3S > C4AF > C2S

Which compound imparts long term strength of cement?

Tricalcium Silicate results in long term strength of cement.

Which compound of cement gives the highest heat of hydration?

C3A gives out highest heat of hydration about 40% more than C3S.

Bogues Compounds of Cement PPT

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