路面混凝土引气剂评价方法的研究

发布时间：2018-06-14 21:12

本文选题：引气剂 + 水泥稀浆摇泡　；参考：《建筑材料学报》2014年04期

【摘要】：采用水泥稀浆摇泡法、水泥砂浆扩展度和插捣密度法来评价混凝土引气剂的合理性,并通过硬化混凝土的含气量、气泡结构和冻融耐久性进行验证.结果表明:可以通过水泥稀浆试验对引气剂的引气性能和稳泡性能进行初步判断,初始气泡高度大则引气性能好,气泡高度变化快则稳泡性能差;水泥砂浆扩展度和插捣密度法同样可用于评价混凝土引气剂,引气性能好则同等掺量下对应的引气砂浆插捣密度小,稳泡性能强则砂浆扩展度和插捣密度值的变化小;新拌混凝土含气量和硬化混凝土含气量差异大,并且相关性不强,高频振捣调整了混凝土的气泡间距;稀浆泡沫性能、砂浆扩展度和插捣密度、硬化混凝土含气量以及气泡间距与混凝土抗冻性有一定的对应关系.
[Abstract]:The rationality of the air-entraining agent of concrete was evaluated by the method of cement slurry rocking foam, cement mortar expansion and density of insertion. The results were verified by the air content, bubble structure and freeze-thaw durability of hardened concrete. The results show that the air entraining performance and foam stability of the air-entraining agent can be preliminarily judged by the cement slurry test. If the initial bubble height is large, the air-entraining performance will be good, and the bubble height will change quickly and the foam stability will be poor. The expansion degree and density method of cement mortar can also be used to evaluate the air entraining agent of concrete. If the air entraining performance is good, the corresponding density of air entraining mortar with the same amount of air entrainment is small, and the change of expansion degree and density value of mortar with strong foam stability is small. The air content of fresh concrete is different from that of hardened concrete, and the correlation is not strong. The high frequency vibration adjusts the bubble spacing of concrete, the properties of dilute mortar foam, the expansion of mortar and the density of intercalation. The air content and bubble spacing of hardened concrete are related to the frost resistance of concrete.
【作者单位】：交通运输部公路科学研究所;
【基金】：国家自然科学基金资助项目(51308264) 交通运输部公路科学研究所基本科研业务费项目(2014-9002)
【分类号】：TU528.042

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