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California Bearing Ratio (CBR) Test Data Sheet, Study notes of Laboratory Practices and Management

University of HertfordshireLaboratory Practices and Management

A data sheet for a california bearing ratio (cbr) test, which measures the load-bearing capacity of soil. Various penetration, swell, and water content data, as well as unit weights and signatures of the technician, computer operator, and checker. The data is organized in a tabular format with clear headings and units.

What you will learn

  • How is the load-bearing capacity of soil measured in the CBR test?
  • What data is included in the CBR test data sheet?
  • What is the purpose of the California Bearing Ratio (CBR) test?

Typology: Study notes

2021/2022

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3. EXCAVA TION NUMBER
1. PROJECT
LABORATORY CALIFORNIA BEARING RATIO (CBR) TEST DATA
DD Form 1212, DEC 1999
4. SAMPLE NUMBER
2. DATE
5. CONDITION
19. PENETRATION DATA
UNDISTURBEDDISTURBED
COMPACTION
DATA
6. MOLD NUMBER
PROVING-RING
DATA
7. NUMBER OF LAYERS 8. BLOWS PER LAYER
10. WEIGHT OF HAMMER
( lb )
11. HEIGHT OF DROP
( in )
9. PERCEN T OF 3/4 in MATE RIAL REPLACED
12. NUMBER 13. CONSTANT 14. CAPACITY 16. SOAKING
( lb )
SURCHARGE
WEIGHT
17. PENETRATING
( lb )
18. SWELL DATA
( Initial / Final )
a. DATE b. TIME c. ELAPSED TIME d. DIAL READING e. INITIAL HEIGHT f. SWELL PERCENT
( d / e x 100 )
0.00
a.
PENETRATION
( in )
0.025
0.500
0.050
0.075
0.100
0.125
0.150
0.175
0.200
0.300
0.400
250
2600
500
750
1000
1125
1250
1375
1500
1900
2300
b.
STANDARD UNIT
LOAD
( psi )
c.
PROVING RING DIAL
READING
( in )
d.
CORRECTED RING DIAL
READING
( in )
e.
TOTAL LOAD
( lb )
f.
UNIT LOAD
( psi )
( e / 3.00 )
g.
CORRECTED UNIT
LOAD
( psi )
h.
CBR ( % )
( g / b x 100 )
WATER CONTENT AND UNIT WEIGHT DATA
20. WEIGHT OF MOLD + WET SOIL
24. TARE NUMBER / SAMPLE TAKEN
a. WEIGHT OF TARE + WET SOIL
b. WEIGHT OF TARE + DRY SOIL
c. WEIGHT OF WATER,
Ww
d. WEIGHT OF TARE
e. WEIGHT OF DRY SOIL,
Ws
( a - b )
( b - d )
25. AVERAGE WATER CONTENT
21. WEIGHT O F MOLD
22. WEIGHT OF WET SOIL
23. WET UNIT WEI GHT,
γ
wet
( 20 - 21 )
( [ 22 / 453.6 ] /0.075 )
Grams
Grams
Pcf
Percent
Percent
Pcf
26. DRY U NIT WEIGHT,
γ
d
=
γ
wet
1 + ( w / 100 )
( c / e x 100 )
Ww
Ws
f. WATER CONTENT,
w
=
x
100
Grams
Grams
Grams
Grams
Grams
SAMPLES TAKEN BEFORE SOAKING AFTER SOAKING
Grams
UNITS
BEFORE COMPACTION AFTER COMPACTION TOP 1 INCH FROM MOLD
15.
EDITION OF AUG 57 IS OBSOLETE.
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Adobe Professional 7.0
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3. EXCAVATION NUMBER

1. PROJECT

LABORATORY CALIFORNIA BEARING RATIO (CBR) TEST DATA

DD Form 1212, DEC 1999

4. SAMPLE NUMBER

2. DATE

5. CONDITION

19. PENETRATION DATA

DISTURBED UNDISTURBED

COMPACTION

DATA

6. MOLD NUMBER

PROVING-RING

DATA

7. NUMBER OF LAYERS 8. BLOWS PER LAYER

  1. PERCENT OF 3/4 in MATERIAL REPLACED 10. WEIGHT OF HAMMER( lb ) 11. HEIGHT OF DROP( in )
  2. NUMBER 13. CONSTANT 14. CAPACITY (^) SURCHARGE 16. SOAKING( lb ) WEIGHT
  3. PENETRATING( lb )

18. SWELL DATA

( Initial / Final )

a. DATE b. TIME c. ELAPSED TIME d. DIAL READING e. INITIAL HEIGHT f. SWELL PERCENT 0.00 ( d / e x 100 )

a. PENETRATION( in )

b. STANDARD UNITLOAD( psi )

c. PROVING RING DIALREADING( in )

d. CORRECTED RING DIALREADING( in )

e. TOTAL LOAD( lb )

f. UNIT LOAD( e / 3.00 )( psi )

g. CORRECTED UNITLOAD( psi )

h. ( g / b x 100 )CBR ( % )

WATER CONTENT AND UNIT WEIGHT DATA

20. WEIGHT OF MOLD + WET SOIL

24. TARE NUMBER / SAMPLE TAKEN

a. WEIGHT OF TARE + WET SOIL b. WEIGHT OF TARE + DRY SOIL c. WEIGHT OF WATER, W (^) w d. WEIGHT OF TARE e. WEIGHT OF DRY SOIL,W (^) s

( a - b )

( b - d )

  1. AVERAGE WATER CONTENT

21. WEIGHT OF MOLD

22. WEIGHT OF WET SOIL

23. WET UNIT WEIGHT,^ γ^ wet

( [ 22 / 453.6 ] /0.075 )

Grams

Grams

Pcf

Percent

Percent

26. DRY UNIT WEIGHT,^ γ^ d =1 + ( w / 100 )^ γ^ wet Pcf

f. WATER CONTENT,w = WW^ w (^) s x 100 ( c / e x 100 )

Grams

Grams

Grams

Grams

Grams

SAMPLES TAKEN BEFORE SOAKING AFTER SOAKING

Grams

UNITS

BEFORE COMPACTION AFTER COMPACTION TOP 1 INCH (^) FROM MOLD

EDITION OF AUG 57 IS OBSOLETE.

  1. TECHNICIAN(Signature) 29. COMPUTED BY(Signature) 30. CHECKED BY(Signature)

DD Form 1212 (BACK), DEC 1999

CBR TEST GRAPH ( Plot test curve below to obtain corrected unit load )

UNIT LOAD

(psi) PERCENT OF STANDARD

PENETRATION (in)

  1. REMARKS