GRADING CURVE1.doc

7/27/2019 GRADING CURVE1.doc

1/11

GRADING CURVES:

20 mm Maximum Aggregate size :( Road Note No.-4 RRL, U.K)

Percentage Passing

Sieves(IS) 0.1

5

0.

30.6 1.2 2.4 4.8 10 20 40 75 100

Curve(4)1.5 12 27 34 42 48 75

10

0

10

0100 100

Curve(3) 0 5 21 28 35 42 65 100

Curve(2)0 3 14 21 28 35 55

10

0

Curve(1)0 2 9 16 23 30 45

10

0

1


2/11

Grading Curves

2

12

34

42

48

75

100 100 100

0

5

21

35

42

65

100

03

14

21

28

35

55

100

02

9

16

23

30

45

100

27

100

28

0

20

40

60

80

100

120

IS Sieve Sizes

%P

assing

Curve(4) Curve(3) Curve(2) Curve(1)

GRADING CURVES:

30 mm Maximum Aggregate size :(Derived from Road Note No.-4 RRL, U.K)

2


3/11

Grading Curves

4

14

25

32

40

48

68

88

100 100 100

1

8

19

26

33

41

58.5

83.5

100

0

5

13

19

26.5

33.5

49.5

79.5

100

02.5

8

14

20.5

27

40.5

75

100

0

20

40

60

80

100

120

IS Sieves

%P

assing


Percentage Passing

Sieves(IS) 0.1

50.3 0.6 1.2 2.4 4.8 10 20 40 75 100

Curve(4)3.5

13.

525 32 40

47.

5

67.

5

87.

5

10

0100 100

Curve(3) 1 8 19 26 33 41 58.5

83.5

100

Curve(2)0 5 13 19

26.

5

33.

5

49.

5

79.

5

10

0

Curve(1)0 2.5 8 14

20.

527

40.

575

10

0

3


4/11

GRADING CURVES:


Percentage PassingSieves(IS) 0.1

5

0.

30.6 1.2 2.4 4.8 10 20 40 75 100

Curve(4)5 15 23 30 38 47 60 75

10

0100 100

Curve(3)2 11 17 24 31 40 52 67

10

0

Curve(2)0 7 12 17 25 32 44 59

10

0

Curve(1)0 3 7 12 18 24 36 50

10

0

4

Grading Curves

5

15

23

30

38

47

60

75

100 100 100

2

11

17

24

31

40

52

67

100

0

7

12

17

25

32

44

59

100

0

37

12

18

24

36

50

100

0

20

40

60

80

100

120

IS Sieves

%P

assing



5/11

Mix-Design (IS-METHOD)

Design stipulations:

1) Characteristic Compressive Strength (fck) :

2) Maximum size of Aggregates (MSA) :

3) Degree of workability:

a) Compacting Factor :

b) Slump :

4) Degree of Quality control :

5) Type of Exposure :B) Test Data for Materials:

1) Cement Used-------- Type :

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Grade :

Date of Manufacture :

2) Specific gravity of Coarse Aggregate :

3) Specific Gravity of Fine Aggregate :4) Water absorption of Coarse Aggregate :

5) Water absorption of Fine Aggregate :

6) Free surface Moisture of Coarse Aggregate :

7) Free surface Moisture of fine Aggregate :

6) Sieve Analysis:

Grading of Coarse aggregate :

Grading of fine aggregate :

C) Target Mean Strength of concrete (Fm=fck + k.S):

Where k=1.65 & S=Standard deviationD) Selection of Water-Cement ratio :

E) Selection of water & sand Content :

Sand Content as per Table 42 of IS :

Water Content as per Table 42 of IS :

Change in Condition (if any) Adjustment required in

(See Table 44) Water content (%) % Sand in total

Aggregate

i) For decrease in w/c ratio by

______________________

ii) For increase in compacting

Factor by________________

iii) For sand conforming to zone

(III/IV)

_________________________________

Total:

Required sand content:-

Required water content:-

F) Determination of Cement Content:

Water-Cement ratio Selected:

Water = Lits.

Cement=---------= kg/Cum.

Cement as per the durability requirement:

G) Determination of Coarse & Fine aggregate:

W M Y

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7/11

Amount of entrapped Air=

V= (w + C/Sn + 1/p fn /Sfn ) 1\1000 for fine aggregates

V= (w + C/Sn + 1/ (1-p) fn /Scn ) 1\1000 for Coarse aggregates

Where

V= absolute volume of fresh concrete

(i.e., gross volume in m3 Volume of Entrapped air)

W=Mass of water per m3 of concrete in Kg.

C =Mass of cement per m3 of concrete in Kg.

Sn=specific gravity of cement, say 3.15

p =ratio of fine aggregate to total aggregate by absolute volumefn, C n= total quantity of fine & Coarse Aggregate per m

3 of concrete respectively in Kg

Sfn, Scn= specific gravity of saturated surface dry fine & coarse aggregate, i.e. 2.6 and 2.7

respectively

Mix-proportion (weigh Batching):-

Water Cement Fine aggregate Coarse aggregate

(Lits) (Kg/Bag) (Kg) (Kg)

Original:

DLBD : ------- ---------

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(Kg/Lit)

Mix proportion in lits. (Volumetric batching):-

Original:

Adjusted:

APPROXIMATE AIR CONTENT

Nominal maximumsize

of aggregate,mm

Entrapped air,percentage

of volume of concrete

10

20

40

3.0

2.0

1.0Source: IS10262-1982

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APPROXIMATE SAND AND WATER CONTENT PER M3 OF CONCRETE Source: IS10262-1982

Changes in condition Adjustment required in

Water content Sand in total

aggregate

For sand conforming toZone-I, Zone-II or Zone-IV

of IS:383-11970

Increase or Decrease in the

value of compacting factor

by 0.1

Each 0.05 increase or

decrease in free water-

cement ratio

for rounded aggregate

0

3 percent

0

-15kg/m3

+1.5%for Zone-I-1.5% for Zone-II

-3% for Zone-IV

0

1 percent

-7 percent

ADJUSTMENT OF VALUES IN WATER CONTENT AND SAND PERCENTAGE FOR CONDITIONS

OTHER THAN THE TABLE ABOVE Source: IS10262-1982

9

Nominal Maximum

size of Aggregate in

mm

Water content per m3

Of concrete in kg

Sand as percentage of

total aggregate by

absolute volume

For grades upto M35

208

186

165

200180

40

35

30

2825

10

20

40

For grades above M35

10

20


10/11

GRADING CURVES:


Percentage Passing

Sieves(IS) 0.15 0.3 0.6 1.2 2.4 4.8 10 20 40 75 100

Curve(4) 2.5 12.75 26 33 41 47.75 71.25 93.75 100 100 100

Curve(3) 0.5 6.5 20 27 34 41.5 61.75 91.75 100

Curve(2) 0 4 13.5 20 27.25 34.25 52.25 89.75 100

Curve(1) 0 2.25 8.5 15 21.75 28.5 42.75 87.5 100

Grading Curves

2.50

12.75

26.00

33.00

41.00

47.75

71.25

93.75

100.00 100.00 100.00

0.5

6.5

20

27

34

41.5

61.75

91.75

100

0

4

13.5

20

27.25

34.25

52.25

89.75

100

02.25

8.5

15

21.75

28.5

42.75

87.5

100

0

20

40

60

80

100

120

IS Sieves

%P

assing


10


11/11

11

GRADING CURVE1.doc

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