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.
💐-— WATCH THIS VIDEO—💐
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.
|
| 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.
● 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.
●Now your turns:– if you are happy to see this post so guys please like 👍share and comment to your friends and if you have any query and questions about this topics please ask😊