Effects of Early-Strength and Antifreeze Agents on Properties of Different Types of Air Entraining Agents

Abstract

Abstract: In order to improve the early-strength and frost resistance of concrete in severe cold environment, air entraining agents are often applied in combination with the early-strength and antifreeze agents, while the properties and mechanism of foaming power and foam stabilization are still not clear when they are used together. In this paper, three kinds of air entraining agents were selected: sodium dodecyl benzene sulfonate (SDBS), trimethyl hexyl ammonium bromide (CTAB) and fatty alcohol polyoxyethylene ether (AEO-9). The effects of Na₂SO₄, NaNO₂ and ethylene glycol on surface activity, foam performance and air content of air entraining concrete were systematically compared. The results show that the addition of Na₂SO₄ and NaNO₂ reduces the critical micelle concentration (c_m) of the solution containing air entraining agents. For SDBS and AEO-9, the c_m is not affected by ethylene glycol, which increases the c_m of CTAB. The variation of foam height of air entraining agents solution conforms to the exponential attenuation model. In addition, Na₂SO₄, NaNO₂ and ethylene glycol decrease the foam stability for SDBS and CTAB, but increase the foam stability of AEO-9 to a certain extent. Based on the concrete experiment, some correlation is observed between air content of concrete and the foam performance of air entraining agents solution while there are still obvious differences.

Key words: early-strength agent, antifreeze agent, air entraining agent, foam height, air content of concrete, surface tension

CLC Number:

TV42

XIA Qiang, WEN Jinbao, TANG Xiusheng, DU Zhiqin, LIU Xingrong. Effects of Early-Strength and Antifreeze Agents on Properties of Different Types of Air Entraining Agents[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(1): 51-59.

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