Many factors affect pores in cemented paste backfill (CPB), and there are numerous species of admixtures which have complicated influences on CPB, such as the action of air entraining agents (AEAs). Previously, sodium abietate (SA) and triterpenoid saponins (SJ) have been used as AEAs. In this study, CPB was prepared by mixing different amounts (0%, 0.2%, 0.4% and 0.6%) of AEA with different compounds (tailings, cement etc.). The quantitative relationship of microscopic characterization between the action of AEAs on CPB pore structure was established using nuclear magnetic resonance (NMR), scanning electron microscope (SEM) and fractal theory. Our results indicate that: (1) T₂ spectrums of CPB samples tested using NMR all have three peaks, where the proportion of main peaks characterizing micro-pores (the main pore type) was >88%. (2) The addition of AEAs increases CPB porosity, optimizes the pore structure in the CPB sample, and achieves uniform distribution. The proportion of main peaks characterizing micro-pores increased to >90%. (3) In the same period the degree of cement hydration reaction was found to differ when CPBs with or without AEAs were compared. The addition of AEAs has a certain delay hindering effect on the cement hydration reaction. (4) The fractal properties of CPB pores with the addition of AEA are very strong. The fractal dimension of pores is linearly directly proportional to AEA content and porosity, and the complexity of pores increases with the increase of fractal dimension.

许多因素影响水泥浆回填（CPB）中的孔，并且有许多种类的外加剂对CPB产生复杂的影响，例如引气剂（AEA）的作用。以前，松香酸钠（SA）和三萜皂苷（SJ）已用作AEA。在这项研究中，CPB是通过将不同量（0％，0.2％，0.4％和0.6％）的AEA与不同化合物（尾料，水泥等）混合而制备的。利用核磁共振（NMR），扫描电子显微镜（SEM）和分形理论建立了AEA对CPB孔结构微观表征的定量关系。我们的结果表明：（1）T ₂使用NMR测试的CPB样品的质谱图均具有三个峰，其中表征微孔的主峰比例（主要孔类型）> 88％。（2）添加AEA会增加CPB的孔隙率，优化CPB样品中的孔结构，并实现均匀分布。表征微孔的主峰比例增加到> 90％。（3）在同一时期，比较带有或不带有AEA的CPB，发现水泥水化反应的程度有所不同。AEA的加入对水泥水合反应具有一定的延迟阻碍作用。（4）加入AEA的CPB孔隙的分形特性非常强。孔隙的分形维数与AEA含量和孔隙率成线性正比关系，孔隙的复杂度随分形维数的增加而增加。