Aditivos

Páginas: 3 (655 palabras) Publicado: 2 de febrero de 2013
ADDITIVES AND THEIR USES
It is common that instead of using a special cement to meet a particular case, this is can change some properties adding an element called additive.

An additive is amaterial different from the normal concrete composition, ie a material which is added immediately before, after or during the realization of the mixture for the purpose of improving the properties ofconcrete, such as strength, manageability, curing, durability, etc.

nowadays, many products are on the market, and there are in liquid, solid, powder and paste. although its effects are described bythe manufacturers, each of them should be checked carefully before using the product because their qualities are yet to be defined.



The most common additives used today can beclassified as follows:

1.-entraining is a type of additive which when added to the concrete mixture produces an increase in air content causing, on one hand, an increase in workability and resistance tofreezing and secondly The reduction in bleeding and segregation. Some of these products are: Inclusair LQ, Sika-Air, Air-Fest, Vinres 1143, Resicret 1144, etc.

2. - Fluidizers: These additivesproduce an increase in the fluidity of the mixture, or can reduce the water required for a given mix consistency, resulting in an increase in workability, while maintaining the same slump. Also, can causeincreased resistance to freezing as both sulfates and improve grip. Some of these are: Festerlith N, N Dispercon, dENSICRET, Quimiment, Adiquim, Resecret 1142 and 1146, Adicreto, Sikament,Plastocreto, etc.

3. - Setting retardants: These additives delay the setting time in the initial mixing and, therefore, affect its strength at early ages. This may decrease the initial resistance.Recommended for warm climates, large volumes or long transportation times. Some of these are: Resicret 1142, Durotard, Hard-Rock N-14, R Festerlith, Sonotard, Festard, Retarsol, Adicreto R, R Densiplast, etc....
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