Humboldt H-3750.5F Relative Density Apparatus - Manual (Page 2)

Introduction
Product Description
Apparatus determines the relative density of cohesionless, free-draining
soils and provides well-defined results on soils that do not respond well to
conventional moisture-density impact compaction testing. Soils for which this
method is appropriate may contain up to 12 percent of soil particles passing
a No. 200 (75µm) sieve, depending on the distribution of particle sizes,
which causes them to have free-draining characteristics. Relative density of
cohesionless soils uses vibratory compaction to obtain maximum density and
pouring to obtain minimum density. Complete set includes: Vibrating table
H-3756.2F, relative density mold sets H-3757 and H-3758 and relative density
gauge set H-3759. Meets ASTM D4253, D4254. Shipping wt. 925 lbs. (420kg)
Models covered in manual include:
230V 60Hz, 12 amps 1ph AC— H-3750.2F
230V 50Hz, 12 amps 1ph AC— H-3750.5F
Relative Density of Cohesionless Soils
This method of test is intended for determining the relative density of
cohesionless free-draining soils for which impact compaction will not produce
a well defined moisture density relationship curve and the maximum density
by impact methods will generally be less than by vibratory methods.
Definition
Relative density is defined as the state of compactness of a soil with respect
to the loosest and densest states at which it can be placed by the laboratory
procedures described in this method. It is expressed as the ratio of:
(1) the difference between the void ratio of a cohesionless soil in the loosest
state and any given void ratio, to
(2) the difference between its void ratios in the loosest and densest states.
Mathematical expressions for this definition are presented in later paragraphs.
Apparatus
The assembly of the apparatus is shown in Figure 1. Individual components and
accessories shall be as follows:
a) H-3756 Vibratory Table. A steel table with a cushioned steel vibrating
deck about 30” x 30”, actuated by an electromagnetic vibrator.
b) Molds. Cylindrical metal unit weight molds of 0.1 and 0.5 cu ft capacity.
c) Guide Sleeves.
d) Surcharge Base Plates.
e) Surcharge Weights.
f) Surcharge Base Plate Handle.