This paper outlines a modified version of ASTM C311/C311M-13 that was applied in the investigation of the effectiveness of different surfactants as air entraining agents (AEAs) in portland cement paste. First, the architecture of surfactant molecules was investigated with respect to their effectiveness as air entraining agents. The work was then generalized to the use of the partition coefficient (log P), a single numerical descriptor of the ratio of hydrophobicity and hydrophilicity of the molecule, to predict the ability to entrain air in concrete. This prediction model showed agreement for all of the surfactants investigated. Ranges of log P are given for satisfactory performance as well as the values that provide the highest volume of air per dosage of surfactant. These findings can help research aimed at admixture development, allow admixture investigation in different cementitious systems, and can provide insights into admixture interactions.
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