Analiza czynników metodycznych w aspekcie wyznaczania minimalnej gęstości objętościowej szkieletu gruntowego w świetle normy PN-B-04481:1988

Analysis of methodological factors in determining the minimum dry to the A b s t r a c t. The paper presents results of interlaboratory comparative test programme. The minimum dry density tests were perfor- med according to PN-B-04481:1988, for four different sands and two types of solid-glass beads, by two laboratories, seven lab workers, using nine different types of funnel. The aim of this research is analysis of the results of the determination of minimum dry density to clarify the provisions of the standard PN-B-04481:1988. The main objectives are to: determine the influence of the geometry of the funnel used to test the minimum dry density on the test results; analyse the human factor on the test results; try to determine the geome- trical criteria for funnels used to test the minimum dry density.