PAGE 81
TABLE 300-1. DENSITY REQUIREMENTS OF EMBANKMENT AND SUBGRADE
MATERIALS
_______________________________________________________________________
S.NoType of Work
Maximum laboratory dry unit weight when tested as per IS : 2720
(Part 8)
_______________________________________________________________________
1Embankments up to 3 meters
Not less than 15.2 kN/cu. m.
height, not subjected to
extensive flooding.
2Embankments exceeding 3
Not less than 16.0 kN/cu. m
Meters height or embankments
of any height subject to long
periods of inundation
3Sub grade and earthen shoulders/Not less than 17.5 kN/cu. m
verges/backfill
Notes: (1) This Table is not applicable for lightweight fill
material e.g. cinder,
fly ash etc.
(2) The Engineer may relax these requirements at his discretion
taking into
Account the availability of materials for construction and other
relevant
Factors.
(3) The material to be used in sub grade should also satisfy
design CBR at the
Dry unit weight applicable as per Table 300-2
TABLE 300-2 COMPACTION REQUIREMENTS FOR EMBANKMENT AND
SUBGRADE
----------------------------------------------------------------------------------------------------------
Type of work/material
Relative compaction as percentage of max. laboratory dry density
as per IS:2720 (Part8)
-----------------------------------------------------------------------------------------------------------------------------------------------------------------1.Sub
grade and earthen shoulders
Not less than 97
2.Embankment
Not less than 95
3.Expansive Clays
a) Sub grade and 500 mm portion
Not allowed
just below the sub grade
b) Remaining portion of embankmentNot less than 90
Table 300-3 GRADING REQUIREMENTS FOR FILTER MATERIAL
Per cent passing by weight
Sieve Designation
Class I Class II Class III
53 mm
- - 100
45 mm
- - 97-100
26.5 mm
- 100 -
22.4 mm - 95-100 58-100
11.2 mm
100 48-100 20-60
5.6 mm
92-100 28-54 4-32
2.8 mm
83-100 20-35 0-10
1.4 mm
59-96 - 0.5
710 micron
35-80 6-18 -
355 micron
14-40 2-9 -
180 micron 3-15 - -
90 micron 0-5
0-4 0-3
TABLE 300-4 GRADING REQUIREMENTS FOR AGGREGATE DRAINSSieve
Size
Per cent passing by weight
Type AType B
63 mm
- 100
37.5 mm
100 85- 100
19 mm
- 0-20
9.5 mm
45-100 0.5
3-35 mm
25-80 -
600 micron
8-45 -
150 micron
0-10 -
75 micron
0-5 -
TABLE 400 -1. GRADING FOR CLOSE-GRADED GRANULAR SUB-BASE
MATERIALS
IS Sieve
Per cent by weight passing the IS sieve
______________________________________________________
Designation
Grading IGrading IIGrading III
75.0 mm 100--
53.0 mm
80-100100-
26.5 mm
55-90 70-100 100
9.50 mm 35-65 50-80 65-95
4.75 mm 25-55 40-65 50-80
2.36 mm 20-40 30-50 40-65
0.425 mm10-2515-2520-35
0.075 mm3-103-103-10
CBR Value (Minimum)302520
TABLE 400 -2. GRADING FOR COURSE GRADED GRANULAR SUB-BASE
MATERIALS
IS Sieve
Per cent by weight passing the IS Sieve
______________________________________________________
Designation
Grading IGrading IIGrading III
75.0 mm 100--
53.0 mm
100
26.5 mm
55-75 50-80 100
9.50 mm
4.75 mm 10-30 15-35 25-45
2.36 mm
0.425 mm
0.075 mm