早强剂和防冻剂对不同类型引气剂性能的影响

摘要/Abstract

摘要： 为了提高严寒环境下混凝土早期强度和抗冻性,常将引气剂与早强剂和防冻剂复合使用,而复合使用时的起泡、稳泡性能及机理尚不明确。本文选取了3种引气剂十二烷基苯磺酸钠(SDBS)、三甲基十六烷基溴化铵(CTAB)以及脂肪醇聚氧乙烯醚(AEO-9),系统比较了早强剂(Na₂SO₄、NaNO₂)和防冻剂(乙二醇)对不同引气剂溶液的表面活性、泡沫性能以及引气混凝土含气量的影响。结果表明:Na₂SO₄、NaNO₂的加入都会降低引气剂溶液临界胶束浓度(c_m),乙二醇增大了CTAB的c_m,而对SDBS和AEO-9的c_m影响不大;引气剂溶液泡沫高度变化符合指数衰减模型,Na₂SO₄、NaNO₂和乙二醇降低了SDBS和CTAB泡沫稳定性,却不同程度地提高了AEO-9泡沫的稳定性;混凝土含气量结果与引气剂溶液泡沫性能具有一定相关性,也存在明显的差异性。

关键词: 早强剂, 防冻剂, 引气剂, 泡沫高度, 混凝土含气量, 表面张力

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

中图分类号:

TV42

夏强, 温金保, 唐修生, 杜志芹, 刘兴荣. 早强剂和防冻剂对不同类型引气剂性能的影响[J]. 硅酸盐通报, 2022, 41(1): 51-59.

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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