The Function of Entrained Air in Concrete
Henry L. Kennedy
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The use of air-entraining agents in portland cement concrete shows considerable promise, particularly in highway concrete where resistance to scaling is an important factor. The need for fundamental research regarding the mechanism by which entrained air functions is suggested and methods of tests are out- lined. Some results of exploratory investigations of the action of air-entraining agents on the individual con-stituents of concrete are reported. It is indicated that the action of air-entraining agents in cement paste differs materially from their action in con- crete. The effect of air-entraining agents on neat cement paste suggests a probable maximum cement content of concrete, above which the beneficial effect of air-entraining agents may become negli- gible, their effect on strength remaining unchanged.