WHAT ARE THE MINERAL ADMIXTURES USED IN CONCRETE?

The following 4 mineral mixtures can be used to make concrete.

  1. rice bran ash
  2. metakaolin
  3. silica odor
  4. fly as

1. Rice Bran Rakhi

This is achieved by burning rice bran in a controlled manner without causing environmental pollution. It is produced in large quantities in rice shelters and 40 kg of rice husk ash is produced from each swath of paddy. Contains,

  • 90% Silica
  • 5% carbon
  • K. 2% of20

The specific surface area of ​​rice bran is 40 to 100 square meters2/Kilogram. Rice bran exhibits high pozzolanic characteristics and contributes to the high strength and high impermeability of concrete as the size of the cement particles is about 100 µm while that of rice bran ash is 25 µm.

2. Metakaolin

It is impure thermally activated ordinary clay and kaolin clay. It shows high pozzolanic reactivity and a reduction in Ca(OH)2 Even as early as a day. It has been found that cement paste undergoes varying densities and as a result helps in increasing strength and decreasing permeability.


Mineral Blend-Metacolin
metacolin

3. Silica Fume

These are byproducts of the reduction of high purity quartz with coal in electric arc furnaces in the manufacture of ferro silicon and silicon metal. These are spherical in shape and less than 0.1 µm in size. The surface area of ​​silica fume is 20m2/g and its size is 100 times smaller than the average cement particles. The chemical composition of silica fume is,

  • 85% silica
  • 1% Ali2hey3
  • Fe. 6% of2hey3
  • 12% carbon

4. Fly Ash

It is the residual form obtained from the combustion of pulverized coal and is carried by flue gases and collected by electrostatic precipitation. Its surface area is 300 to 700 square meters.2/Kilogram. Its particles are finer than cement particles. It is light brown to dark brown in colour. Its chemical composition is,

  • 30 to 60% silicone
  • 15 to 30% aluminum oxide (Al2hey3,
  • 30% carbon
  • 1 to 7% calcium oxide and
  • MgO and SO . small amount of

It is used extensively in dams for concreting, retaining walls, etc.


Er. Mukesh Kumar

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Er. Mukesh Kumar is Editor in Chief and Co-Funder at ProCivilEngineer.com Civil Engineering Website. Mukesh Kumar is a Bachelor in Civil Engineering From MIT. He has work experience in Highway Construction, Bridge Construction, Railway Steel Girder work, Under box culvert construction, Retaining wall construction. He was a lecturer in a Engineering college for more than 6 years.