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To Provide Efficient and Cost Effective Products and Services

Petro -Chemical Division

This Division handles all Petroleum based products, refined from Hydro-carbon cracking with special attention to Bitumen.

Vegetable Oil Division

Our State-of the Art Processing and Packing facility for producing superior quality ALFA Brand Cooking Oil, RBD Palm Oil.

Polymer Modified Bitumen

BITUMEN + MODIFIER = MODIFIED BITUMEN

Modified Bitumen Introduced in Eighties to combat with common pavement distress. There are about 4 different specifications based on type of modifier used similar to ASTM specifications for modified bitumen. Many Authorities advises for use of minimum 10% modified Bitumen.

ADVANTAGES OF MODIFIED BITUMEN

    • Higher Resistance to Deformation at high Temperature
  • Improved Aging Resistance
  • Improved Adhesion between Aggregate and Binder
  • Higher Fatigue Life of Mixes
  • Delay in Thermal / Reflective Cracking
  • Improved Temperature Susceptibility
  • Over all Extended Pavement Life

 

TYPES OF MODIFIED BITUMEN

1. PLASTOMERIC THERMO PLASTIC BASED Type-A(PMB 120, 70, 40) –PENETRATION BASED
polymer used PE, EVA, EBA,EMA etc.

2. ELASTOMERIC THERMOPLASTIC BASED Type-B(PMB 120, 70, 40)–PENETRATION BASED
polymer used SIS, SBS, ETP etc.

3. NATURAL RUBBER BASED Type-C (NRMB 120, 70, 40) –PENETRATION BASED
Latex or Rubber powder used.

4. CRUMB RUBBER BASED Type-D (CRMB 50, 55, 60) –SOFTENING POINT BASED
Crumb Rubber powder from discarded truck tires used.

A. SPECIFICATION OF POLYMER MODIFIED BITUMEN, PMB(P)

S.NO

Characteristic

Requirements

ASTM Standards

PMB(P)-50

PMB(P)-55

PMB(P)-60

1

Penetration at 25°C, 1/10mm, 100g, 5 sec

90-150

50-90

30-50

D 5

2

Softening Point, (R&B),°C, Min

50

55

60

D 36

3

Fraass Breaking Point # °C, Min

-20

-16

-12

-

4

Elastic Recovery at 15°C, %, Min or

50

40

30

D 6084

G*/sin?, min1.0 kpa, 25 mm plate, 10rad/s at a temp °C

52

58

72

 

5

Flash Point, COC, °C, Min

220

220

220

D 92

6

Separation, Difference in Softening Point, (R&B),°C, Max

3

3

3

-

7

Viscosity at 150°C, Poises

1-3

2-6

3-9

D 2170/D4402

8

Thin Film Oven Test & Tests on Residue

-

-

-

D 2872

8a

Loss in Mass, %, Max

1.0

1.0

1.0

D 6

8b

Reduction in Penetration of residue at 25°C, 1/10mm, 100g, 5 sec, %, Max

35

35

35

-

8c

Increase in Softening Point, °C, Max

7

6

5

-

8d

Elastic Recovery at 25°C, %, Min or

35

30

20

D 6085

# Relevant to snow bound cold climate

B.SPECIFICATION OF POLYMER MODIFIED BITUMEN, PMB(E)

S. NO

Characteristic

Requirement

ASTM
Standards

PMB(E)50

PMB(E)55

PMB(E)60

1

Penetration at 25°C, 1/10mm, 100g, 5 sec

90-150

50-90

30-50

D5

2

Softening Point, (R&B),°C, Min

50

55

60

D36

3

Fraass Breaking Point # °C, Min

-20

-16

-12

-

4

Elastic Recovery at 15°C, %, Min

70

70

70

D6084

5

Flash Point, COC, °C, Min

220

220

220

D92

6

Separation, Difference in Softening Point, (R&B),°C, Max

3

3

3

-

7

Viscosity at 150°C, Poises

1-3

2-6

3-9

D2176

8

Thin Film Oven Test & Tests on Residue
-
-
-

D2872

8a

Loss in Mass, %, Max

1.0

1.0

1.0

D6

8b

Reduction in Penetration of residue at 25°C, 100g, 5 s, %, Max

35

35

35

-

8c

Increase in Softening Point, °C, Max

7

6

5

-

8d

Elastic Recovery at 25°C, %, Min

50

50

50

D6085

# Relevant to snow bound cold climate

C. Specification of Natural Rubber Modified Bitumen, NRMB

S.NO

Characteristic

Requirement

ASTM
Standards

NRMB45

NRMB50

NRMB55

1

Penetration at 25°C, 1/10mm, 100g, 5 sec

90-150

50-90

30-50

D 5

2

Softening Point, (R&B),°C, Min

45

50

55

D 36

3

Fraass Breaking Point # °C, Min

-20

-16

-12

-

4

Elastic Recovery at 15°C, %, Min

50

40

30

D 6084

5

Flash Point, COC, °C, Min

220

220

220

D 92

6

Separation, Difference in Softening Point, (R&B),°C, Max

3

3

3

-

7

Viscosity at 150°C, Poises

1-3

2-6

3-9

D 2170/D4402

8

Thin Film Oven Test & Tests on Residue
-
-
-

D 2872

8a

Loss in Mass, %, Max

1.0

1.0

1.0

D 6

8b

Reduction in Penetration of residue at 25°C, 100g, 5 s, %, Max

35

35

35

-

8c

Increase in Softening Point, °C, Max

7

6

5

-

8d

Elastic Recovery at 25°C, %, Min

35

25

20

D 6085

# Relevant to snow bound cold climate

D. Specification of Crumb Rubber Modified Bitumen, CRMB

S.NO

PROPERTIES

CRMB
50

CRMB
55

CRMB
60

ASTM STANDARDS

1

Penetration at 25°C, 1/10mm, 100g, 5 sec

< 70

< 60

< 50

D5

2

Softening Point, (R&B),°C, Min

50

55

60

D36

3

Elastic Recovery at 15°C, %, Min

50

50

50

D6084

4

Flash Point, COC, °C, Min

220

220

220

D92

5

Separation, Difference in Softening Point, (R&B),°C, Max

4

4

4

-

6

Viscosity at 150°C, Poises

1-3

2-6

3-9

D2170/D4402

7

Thin Film Oven Test & Tests on Residue
-
-
-

D2872

7a

Loss in Mass, %, Max

1.0

1.0

1.0

D6

7b

Reduction in Penetration of residue at 25°C, 100g, 5s, %,Max

40

40

40

-

7c

Increase in Softening Point, °C, Max

7

6

5

-

7d

Elastic Recovery at 25°C, %, Min

35

35

35

D6085

 

Selection Criteria for Grades of Modified Bitumen

Lowest  Mean Air Temperature °C

Highest Air  Mean Temperature °C

Less than 20°C

20°C to 30°C

More than 30°C

More than -10°C

PMB / NRMB 55

PMB / NRMB 45

PMB / NRMB 50

 

CRMB 50

CRMB 55

CRMB 60

-10°C or lower

PMB / NRMB 55

PMB / NRMB 120

PMB / NRMB 45

 

CRMB 50

CRMB 50

CRMB 55

• PMB = Polymer Modified Bitumen * NRMB = Natural Rubber Modified Bitumen • CRMB = Crumb Rubber Modified Bitumen

Working Temperature Requirement for Modified Bitumen

STAGE OF WORK

INDICATED
TEMPERATURE °C

BITUMEN AT MIXING TEMPERATURE

165 - 185

AGGREGATE AT MIXING

165 - 185

MIX AT MIXING PLANT

150 - 170

MIX AT LAYING

130 - 160

ROLLING AT LAYING SITE

115 - 145

 

Guidelines for Storage of Modified Bitumen

Modified binder
Temperature °C at
point of Mixing

Holding Time at
Mixing Temperature
(max)

Medium
storage
Temp.°C

Safe Medium
Storage Time
Period

165-185

4 days

130-140

14 days

 

Requirements of Mix Prepared with Modified Bitumen

S.No

Properties

Requirement

Hot Climate

Cold Climate

High Rainfall

1

Marshall Stability (75

12

10

12

 

blows) at 60oC, kN, Max
-
-
-

2

Marshall Flow at 60oC, mm

2.5-4.0

3.5-5.0

3.0-4.5

3

Marshall Quotient, kg/mm
-

250-500
-

4

Voids in Compacted Mix, %
-

3.0-5.0
-

5

 

Modified Binder Content by
weight of mix-min*

 5.4%  - 5.6%

4.7%  - 5.2%

 4.3%  - 4.7%

6

Retained stability after 24 hrs. in water at 60oC %, min

90

95

100

7

Coating with aggregate, %

95

95

100

*Corresponded to specific gravity of the aggregate being 2.7. In case Specific gravity more than 2.7, bitumen content can be reduced proportionately.

The bitumen content may be increased up to 0.5% in case highest Mean air temperature is 30 °C or lower & lowest mean air temperature is -10 °C or lower.