Friday 23 May 2014

Concrete Admixtures - additives to sturdy concrete


Concrete admixtures are additives added to concrete to strengthen,chemically resist,color resist,reduction in water and cement requirement and to enhance working properties of concrete.

Types of admixtures
  •  Shrinkage reducers    
  •  Corrosion inhibitors
  •  Hydration-control admixtures
  • Retarding admixtures
  •  Accelerating admixtures
  • Plasticizers
  • Water-reducing admixtures
  • Air-entraining admixtures
  • Alkali-silica reactivity inhibitors
  • Coloring admixtures  



Source-http://www.admixtures.com/images/Ctrl_BoomImage/boom_uid5192009313442.jpg

WATER-REDUCING ADMIXTURES  

Water-reducing admixtures are used to reduce the quan-tity of mixing water required to produce concrete of a certain slump, reduce water-cement ratio, reduce cement content, or increase slump. Typical   water reducers reduce the water content by approximately 5% to 10%. Adding a water-reducing admixture to concrete without reducing the water content  can produce a mixture with a higherslump.The rate of slump loss, however, is not reduced and in most cases is increased . Rapid slump loss results in reduced workability and less time to place concrete. An increase in strength is generally obtained with water-reducing admixtures as the water-cement ratio is cracks in concrete. Using a water reducer to reduce the cement and water content of a concrete mixture—while maintaining a constant water-cement ratio—can result in equal or reduced compressive strength, and can increase slump loss by a factor of two or more (Whiting and Dziedzic 1992).

 Reasons for using admixtures 
  • To maintain the quality of concrete during the stages of mixing, transporting, placing, and curing in ad-verse weather conditions.
  • To achieve certain properties in concrete more effectively than by other means.
  • To reduce the cost of concrete construction
  • To overcome certain emergencies during concreting operations. 

Concrete Admixtures Market Forecast

The global construction industry was one of the highest booming markets in the 2000 decade. Most of the cement and admixtures companies have grown immensely during this era. However, the industry has been through a huge difficulty in last few years due to global financial crisis observed in the year 2009. Especially, the construction markets from Europe and North America were in deep hindrance. The industry showed a downfall in the Asia Pacific and Middle East region too, however, the effects were not as adverse as observed in other regions. The collapsed construction industry affected cement and admixtures consumption along with production.

for more info , visit -

http://www.marketsandmarkets.com/Market-Reports/concrete-admixtures-additives-market-768.html

 

 
 



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