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DESCRIPTION
RB-AE is an air-entraining admixture, which creates ultra-stable air bubbles that are strong, small and closely spaced.
Entraining a controlled air content in a wide range of concrete types:
RB-AE is available in 220 kg drums and 20 kg gallons.
Physical state: liquid
Density: Approximately 1kg/m3
Chloride content: according to standard
Color: light brown
ASTM C-260-86
AASHTO M-154 CRD-C 1377
BS 5075: Part 2
DIN 1048 Part 1
There is no standard dosage rate for RB-AE admixture. The exact quantity of air-entraining admixtures needed should be determined by trial mixes. Factors are: temperature, cement, sand grading, sand-aggregate ratio, slump, means of conveying and placement, use of extra fine materials such as fly ash and micro silica.
The amount of RB-AE admixture used will depend upon the amount of entrained air required under actual job conditions. In a trial mix, use 60 gr to 400 gr per 100kg of cement and adjust in the light of results obtained. In mixes containing water-reducing, set-controlling admixtures, the amount of RB-AE needed is somewhat less than the amount required in plain concrete.
An increase in the amount of sand in concrete leads to an increase in air entraining.
An increase in the amount of cement in concrete leads to reduce in air entraining.
Organic impurity reduce the effectiveness of RB-AE.
Increasing the concrete temperature reduce the effectiveness of RB-AE.
When using RB-AE, avoid excessive vibration.
When two or more admixtures are used, they must be added to the mix separately (through dispensers or manually) and must not be mixed with each other prior to adding to the concrete mix. For optimum, consistent performance, the air- entraining admixture should be dispensed on damp, fine aggregate.
In presence of water reducing agents, the amount of air entraining is lower than that used for normal concrete (0.1-0.5 cement wt %)
RB-AE admixture should be stored and dispensed at 2°C or higher. Although freezing does not harm this product, precautions should be taken to protect it from freezing. If it freezes, thaw and reconstitute by mild mechanical agitation. Do not use pressurised air for agitation. Shelf life is 12 months when stored as above.
RB-AE contains no hazardous substances requiring labelling. For further information refer to the Material Safety Data Sheet.
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