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自四十年代应用引气剂改善混凝土性能以来,混凝土孔系结构除原有的凝胶孔、毛细孔和粗大的孔隙外,又增加了大量由引气剂发生的、孔径多在5～1000μ大小的气孔。这些小气孔属封闭系统,它的存在能增进混凝土的和易性,并大大加强混凝土的抗冻融性能;但如含气量过高又将影响到混凝土的强度。因此,研究这些气孔的数量、孔径大小和气孔平均间距等各项参数,对了解和对比各种引气剂、减水剂在混凝土中的作用和效果,选择和确定最佳参数有重要的现实意义。
Since the application of air-entraining agents to improve concrete performance in the 1940s, in addition to the original gel pores, capillary pores, and coarse pores, the concrete pore structure has also increased a large number of pore-forming agents with pore sizes in the range of 5-1000μ. Size pores. These small pores are closed systems. Its presence can improve the workability of concrete and greatly enhance the freeze-thaw resistance of concrete. However, if the gas content is too high, it will affect the strength of the concrete. Therefore, studying the parameters such as the number of pores, the pore size and the average pore spacing, etc., are important for understanding and comparing the effects and effects of various air-entraining agents and water-reducing agents in concrete, and for selecting and determining the best parameters. significance.