1.1 This specification covers materials proposed for use as air-entraining admixtures to be added to concrete mixtures in the field.1.2 The values stated in SI units are to be regarded as the standard. The values given in parentheses are for inf This specification covers materials proposed for use as air-entraining admixtures to be added to concrete mixtures in the field. The air-entraining admixture shall conform to the requirements such as initial and final time of setting, compressive stren