Determining the Density and Unit Weight of Soil in Place by the Rubber-Balloon Method - Soil Properties: Testing, Measurement, and Evaluation - page 222

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

18 SR 2828

Sample No. Project No.

Newell, N.C. 5/22/08

Location Date

Brown silty clay

Description of Soil

John Doe

Tested by

(1) Initial reading of volume indicator on rubber-balloon apparatus on job site
51 mL
(2) Final reading of volume indicator on rubber-balloon apparatus on test hole
1,317 mL
(3) Volume of test hole [(2) (1)] 1,266 mL
(4) Mass of all moist soil from test hole of pan

3,172

g

(5) Mass of pan 815 g
(6) Mass of all moist soil from test hole [(4) (5)]

2,357

g

(6)
(3)

1.862

g/cm 3 (7) Wet density

116.2

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)

2-A

Can no.

293.8

(b) Mass of moist soil can g

258.8

(c) Mass of dry soil can g

45.2

(d) Mass of can g

35.0 g

(e) Mass of water

213.6

( f ) Mass of dry soil g

(e)
(f) 100

16.4

(g) Moisture content %

(8)
(g) 100 100

99.8

lb/ft 3

(10) In-place dry unit weight of soil

222