| 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. |
| 关键词: 引气剂 水泥稀浆摇泡 砂浆插捣密度 气泡结构 冻融耐久性 |
| DOI：103969/j.issn1007 9629201404033 |
| 分类号: |
| 基金项目: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） |
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| Evaluation Method of Pavement Concrete Air Entraining Agent |
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KE Guoju, TIAN Bo, WANG Jiliang
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Research Institute of Highway Ministry of Communication, Beijing 100088, China
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| Abstract: |
| The rationality of methods of thin cement paste shaking bubble, cement mortar divergence and real density to evaluate the concrete air entrained performance were discussed, and then it was proved by measurement of air content, bubble structure and freeze thaw durability of hardened concrete. Results show that preliminary judgment of air entrained performance could be made through thin cement paste trial. The higher the initial bubble, the better the bleed air performance is; the faster the bubble level changes, the worse the foam stability is. The method of cement mortar divergence is as suitable for use as the method of real density. The less the cement mortar density, the better the bleed air performance is; the better the foam stability, the smaller the deviation of cement mortar divergence from the method of real density is. Air content difference between fresh concrete and harden concrete is large, while high frequency vibration adjust the spacing of the bubble spacing. There are some corresponding relationships among foam slurry performance; cement mortar divergence and real density; air content, bubble space and freeze thaw durability of harden concrete. |
| Key words: air entraining agent thin cement paste shaking bubble tamped mortar density bubble structure freeze thaw durability |
