Air-entraining admixtures

Air-entraining admixtures are surfactants that cause small, permanent bubbles of air to be formed in the concrete during mixing. The air-entraining admixtures are used in concretes that require freeze-thaw resistance. Freeze-thaw resistance means the hardened concrete’s ability to tolerate freeze-thaw cycles when wet. In Finland, nearly all outdoor concrete structures are subject to freezing temperatures and must be resistant to them.

Air entrainment of concrete and a sufficient number of bubbles are key factors when it is important to ensure that concrete is freeze-thaw resistant. Water expands by 9% when it freezes. If the concrete’s pores are full of water, the pressure of the freezing water results in micro-cracking. Cracking increases as the number of freeze-thaw cycles is repeated and will eventually lead to the weathering of the concrete. Air-entraining admixtures create bubbles of air in the concrete, providing space for the freezing water to expand.

Using air-entraining admixtures also usually reduces the water demand in the concrete and the bubbles improve the workability and cohesiveness of the concrete.

Air-entraining admixtures

Finnsementti is the only Finnish manufacturer of cement. Harnessing our century-long experience, we produce consistently superior cement and create jobs within our industry. The majority of Finland’s cement demand is produced at Finnsementti’s plants in Pargas and Lappeenranta. In addition to cement, our offering includes various concrete admixtures, mineral additives and special aggregates.

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P.O. Box 115
Lars Sonckin kaari 16
02601 Espoo, Finland
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