What is admixture of concrete, it types and uses

In this post we know about what is admixture of concrete,its types and uses, hi guys we study about concrete admixture and concrete admixture types, know about natural admixtures, mineral admixture and manufactured admixture, what is concrete admixture and why we use admixture in concrete.

Admixture of concrete is the extra material in the form of liquid ,powder or paste added  to concrete before or during the mixing process is known as admixture.

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Admixture of concrete may be natural ,manufactured chemical or semi synthetic chemical. Concrete admixture is act as retarder , accelator ,plasticizer ,fungicidal agent ,water resistant agent, corrosion preventing agent.

What is admixture of concrete, it types and uses
What is admixture of concrete, it types and uses
Admixture

What is admixture of concrete and its types and uses.

 Admixture of concrete is the extra material in the form of liquid ,powder or paste added  to concrete before or during the mixing process is known as admixture.

it may be natural ,manufactured chemical or semi synthetic chemical. Concrete admixture is act as retarder , accelator ,plasticizer ,fungicidal agent ,water resistant agent, corrosion preventing agent.

Use of admixture in concrete

 Common example and use of admixture in concrete concrete are Alum ,Aluminium Sulphate ,barium oxide ,Bitumen, calcium chloride ,coal ash, common salt, iron oxide, lime ,mineral oil,organic oil ,potassium chloride ,tar product ,zinc chloride, volcanic ashes and carbon etc.

‚óŹ Uses of admixture in concrete:-Concrete admixture used and act as water reducing agent, accelerator, air entraining agent, waterproofing agent, gas forming agent, air entraining agent, alkali aggregate expansion preventing agent.

Admixture adjusting the final setting time of concrete and it increases the higher early and ultimate strength and also make the concrete higher and self travelling.

concrete admixture used for various purpose are following:

1) It Act as water reducing agent

 2) It Act as accelator

 3) air entraining agent

  4) waterproofing agent

 5) gas forming agent

 6) Air  detraining agent

 7) alkali aggregate expansion preventing agent

 8) admixture adjusting the final setting time of concrete

 9)admixture increase the higher early and ultimate strength

 10) admixture make the concrete higher slump and self travelling 

 11) admixture increase the durability of concrete

 12) it also  reduced quantity of cement

13) it also reducing the permeability of concrete

Concrete admixture types according to origin

Concrete admixture are three types according to origin from which they are obtained, 1) natural concrete admixtures 2) mineral concrete admixture and 3) manufactured concrete admixture.

Types of admixture of concrete are following:

 (1) natural admixtures

   (2) mineral admixture

 ( 3) manufactured admixture

  natural admixtures of concrete

Natural admixture of concrete is obtained from pure Natural sources from plant products, its increase the durability of concrete, its example is  cellulose ,natural rubber, gum etc.

it is added to the concrete before  or during the mixing of concrete.

  mineral admixture in concrete

Mineral admixture in concrete is obtained from mineral sources like Mineral oil ,organic oil silica, lime coal ashes

 manufactured admixture of concrete

Manufactured admixture of concrete is made in factories by the laboratory process, the mineral or natural product which is obtained from Natural Sources it is modify by human beings like that synthetic rubber obtained from natural rubber and making of Coal Tar from coal or bitumen etc.

Concrete admixture types according to function

 Concrete admixture types according to its function, are categorised into following types: accelerating concrete admixture, air entrainment concrete admixture, water reducing concrete admixture, retarding concrete admixture, pozzolanic concrete admixture, waterproofing concrete admixture, corrosion preventing concrete admixture, anti wash out concrete admixture, bonding concrete admixture and insecticidal concrete admixture

 concrete admixture accelarator

this type of admixture reduce initial setting time of concrete and also speed of final setting and hardening of concrete. It is commonly used in low Temperature zone of world having cold climate condition.

you know that in cold season setting of concrete taking long time that’s why accelerating type of admixture is added¬† to concrete to reduce¬† the setting time of concrete.

 example of concrete admixture accelerator are (1) calcium formate ,(2)calcium chloride and (3)silica fume

 Concrete air entrainment admixture

it is new generation admixture used in today new technology in cold climate region of the world for final setting and hardening of concrete.

It Increase durability of concrete under freezing condition, when added to the concrete it make millions of non -coalescing air bubbles which are make more counter interact between sand cement and aggregate and take long time for setting.

And prevent from  shrinkage and cracking concrete.

example of air entraining concrete admixture are ( 1) resin,(2) vegetable fats,(3) animal fats and (4) Teepol

water reducing concrete admixture

 it can minimise demand of water also known as plasticizer .plasticizer have few types like 1)mid range plasticizer 2) normal plasticizer and 3)superplasticizer. Normal plasticizer can minimise 10% of extra water and mid range plasticizer can minimise 15% of extra water and super plasticizer can minimise 30% of extra water.

Example of water reducing admixture are (1) calcium, (2)sodium, (3)ammonium lignosulfonate and (4)polycarboxylate

Retarding admixtures of concrete

it can Slow Down The hydration of cement in initial stage and increase the initial setting time of concrete is also called as retarder.

it can be used  in high Temperature zone of world .you know that in high temperature setting time of concrete is decrease .to inhance and balance the concrete settling time retarder is used.

In absence of retarder the bond between cement sand and aggregate will be poor Bond and it can be  tracking . So retarder is must used in high Temperature zone during the formation of concrete.

 Example of retarder admixture of concrete are ( 1)calcium sulphate,(2)gypsum and (3)starch

Pozzolanic admixture of concrete

 in new generation Technology it is used to prepare dense concrete and used for formation of water retaining structure like Dam ,Talab where it can reduce the hydration and thermal structure of RCC work by several alkali material which are present in water.

Example of pozzolanic admixture are (1) fly ashes and (2)silica fume

water -proofing admixture of concrete

 it can make concrete  impermeable to water and prevent from dampness on concrete.

Example water proofing admixture are (1) Aluminium Sulphate, (2)calcium chloride and (3)silicate of soda

 corrosion preventing admixture

it can prevent concrete from corrosion of iron oxide .most commonly used admixture  is sodium benzoate and sodium nitrate which prevent concrete from corrosion

 anti wash-out admixture

underwater condition like Dam and Talab it increases the cohesiveness of concrete. And prevent from wash out of concrete. Most commonly is used is cellulose.

 bonding concrete admixture

this type of admixture is being used when we make new concrete surface on old concrete surface, when we apply new concrete material on old concrete surface bonding between old and new concrete is poor.

To increase the bonding strength between old and new concrete we should use bonding type of admixture like natural rubber and PVC known as polyvinyl chloride.

 insecticidal concrete admixture

when fresh concrete comes in contact with water and moisture and air there is a so many types of germs and fungi and algae germinate on the surface of concrete.

To prevent from germs and fungi we should use insecticidal type of admixture. Most commonly insecticidal admixture is poly halogenated phenol.

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