Set Two

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Set Two

1 part.

Retarders. Set or set retarding mixture is used in concrete. mixes to slow hydration process of cement and they are set.

Their action is most desirable in the case of high temperature. Temperatures can reduce the time setting of the concrete enough. They lack the same if not unexpected. Or delay the timing of the cast.

Versions of the mixture. If set retarding water reducing their ability to be used as criteria:.

Simple * Set mixture. retarding influence is not serious. In their work.

* Set retarding water reducers can increase the ability to work for par. W / C ratio.

* Set superplasticizers. retarding the port can increase the concrete work for par. W / C ratio.

The main mixture. Set retarding.

1. To maintain workability of concrete.

2. They used to delay setting. It can help eliminate joints and cold. / Or the time to end the process.

3. They can be. water reducers to increase strength. compressive or final.

4. They can be. plasticizers / superplasticizers. To increase workability.

Presence of the chemical mixture. Set retarding.

– Salts of the acid. lignosulfate.

Salt – the acid hydroxycarboxylic.

– Polysaccharides. And their derivatives.

– Polymer Hydroxylated.

Set mixture. retarding: Path of Action.

Mixture of ingredients used. retarding mechanism set off with cement particles. adsorption.

In how they separate from the cement and water protection process. This hydration.

How much time will depend on the thickness of the film.

Clearly the largest. admixture retarding thicker film set.

After time. Available from several minutes to a few hours,. Film will be lost and steps hydration. Will go on.

It is important not to overdose, especially. In low temperature. The case of arrest. hydration and concrete will not be located.

DOSAGES.

They are very different. Admixture retarding type and temperature settings. Than low temperature inert.

Dosages range between the most common. 0.3% – 0.8% by weight for cement. plasticizers retarding set and from 0.7% to 1.3-1.5% for. superplasticizers retarding setting.

End section. 1.

Strogilis Chris.

Civ. Eng. – MBA – DipM.

 

 

 

 

About the Author:

Civil engineer with postgraduate studies in MBA and Marketing.
christos@macon.gr
http://maconwaterproofing.blogspot.com/
http://totalfitness-christos.blogspot.com

Article Source: ArticlesBase.comSet retarders/set retarding admixtures for concrete

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