For optimized fly ashes, specific surface value determined by airpermeabilitymethod is more desirable than fineness value by sieve analys...
对于优化粉煤灰，用透气法测定其比表面积比用筛析法测定的细度，更适宜于表征粉煤灰的品质。
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This paper develops a model for measuring airpermeability of partially saturated asphalt samples using falling-pressure method in laboratory introduced by Li et al.
介绍的实验室方法——自然降压法，结合实验数据，给出一个测量非饱和湿沥青样品空气渗透系数的方法。
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Deduce the airpermeability calculating formula base on the regression analysis method. Provide a strong basis for the selection of PET, aluminum PET and PVDC film in food packaging.