一、灌砂法基本原理灌砂法基本原理是利用粒径0.30～0.60mm或0.25～0.50mm清洁干净的均匀砂,从一定高度自由下落到试洞内,按其单位重不变的原理来测量试洞的容积,并根据集料的含水量来推算出试样的实测干密度。 First, the basic principle of sand filling method The basic principle of sand filling method is the use of particle size 0.30 ~ 0.60mm or 0.25 ~ 0.50mm clean uniform sand, free fall from a certain height to the test hole, according to the principle of constant weight The volume of the test hole is measured, and the measured dry density of the sample is calculated according to the water content of the aggregate.