Determining the Density and Unit Weight of Soil in Place by the Rubber-Balloon Method - Soil Properties: Testing, Measurement, and Evaluation - page 225

Soils Testing Laboratory
In-Place Density and Unit Weight Determination:
Rubber-Balloon Method

Sample No. Project No.

Location Date

Description of Soil

Tested by

(1) Initial reading of volume indicator on rubber-balloon apparatus on job site
mL
(2) Final reading of volume indicator on rubber-balloon apparatus on test hole
mL
(3) Volume of test hole [(2) (1)] mL
(4) Mass of all moist soil from test hole of pan g

(5) Mass of pan g
(6) Mass of all moist soil from test hole [(4) (5)] g

(6)
(3)

g/cm 3 (7) Wet density

lb/ft 3

(8) Wet unit weight [62.427 (7)]

(9) Field moisture content determination
Note—If the moisture content is determined by a calcium carbide gas pressure
tester, enter the moisture content directly in the appropriate blank below, and skip the
intervening steps.
(a) Can no.

(b) Mass of moist soil can g

(c) Mass of dry soil can g

(d) Mass of can g

(e) Mass of water g

( f ) Mass of dry soil g

(e)
(f) 100

(g) Moisture content %

(8)
(g) 100 100

lb/ft 3

(10) In-place dry unit weight of soil

225