It takes much time and requires more instruments to measure the wide range gradation of fly ash by using the sieve and pipette analysis.
用筛分析与移液管分析相结合法测定宽粒径范围粉煤灰级配，需要花费较长的时间、较多的仪器才能完成，改用筛分析与光电颗分仪相结合法来测定其级配，能有效地节省测定时间，简化计算，保证精度要求，具有一定的实用价值。
According to Principle of quiescent sedimentation granula analysis, the densimeter method and the piette method are used to get the size grading of fine-grain soil and the errors of two methods are analyzed.
根据静水沉降颗粒分析法计算公式原理,分别采用了常用的密度计法和移液管法求取细颗粒土的粒径级配,分析了两种方法试验误差产生的原因,并证明密度计法较移液管法具有更简便、准确、节能的特点,建议尽量采用密度计法。