Polymer Modified Bitumen

Polymer Modified Bitumen produced by blending Molten Bitumen with suitable polymers and additives. PMB binders range from lightly modified to heavily modified and can be used in High Stress Seals (HSS), Strain Alleviating Membranes (SAM) and Strain Alleviating Membrane Interlayer (SAMI).Careful selection of polymer types greatly enhances binder performance, improving elasticity, reduce temperature susceptibility and improves adhesion

PMB are classified based on the penetration, softening point and FRAASS breaking Point

Types & Uses of PMB:

  • PMB 120: Recommended for cold climate areas
  • PMB 70: Recommended for moderate climate areas
  • PMB 40: Recommended for hot climate areas

Application

PMB can be applied for various requirements like improvement in rutting resistance, thermal cracking, fatigue damage, stripping, and temperature susceptibility. Polymer modified bitumen have substituted non-modified, neat bitumen in many paving and maintenance applications, as defined below:

  • hot mix
  • warm mix
  • cold mix
  • chip seals
  • hot and cold crack filling
  • patching
  • recycling
  • slurry seal.

Advantages

  • Higher cohesion and better adhesion to mineral aggregates
  • Larger range of plasticity (temperature range between breaking point and fusion point)
  • Great elastic recovery after relief
  • Higher fatigue resistance
  • Superior rheology for seals subjected to traffic induced cracks.
  • Higher cohesive strength to with stand stripping action of high speed traffic.
  • Higher viscosity at elevated temperatures combats bleeding of binder.

Product Range of PMB

  • PMB E40
  • PMB E70
  • PMB E120

Specification of PMB AS PER :IS 15462:2004

Characteristic

Elastomeric
Thermoplastic Based
Grade & Requirement

Plastomeric
Thermoplastic Based
Grade & Requirement

E 40

E 70

E 120

P 40

P 70

P 120

Penetration at 25 OC, 0.1 mm, 100 g, 5 s

30- 50

50- 90

90-150

30-50

50-90

90-150

Softening point, (R&B), OC, Min

60

55

50

60

55

50

FRAASS breaking point, 1),OC, Min

-12

-16

-20

-12

-16

-20

Flash point, COC, OC, Min

220

220

220

220

220

220

Elastic recovery of half thread in
ductilometer at 15 OC, percent, Min

70

70

70

30

40

50

Separation, difference in softening
point, R&B, OC, Max

3

3

3

3

3

3

Viscosity at 150 OC, Poise

3-9

2-6

1-3

3-9

2-6

1-3

Thin film oven test and tests on residue:

a) Loss in mass, percent, Max

1.0

1.0

1.0

1.0

1.0

1.0

b) Increase in softening point, OC, Max

5

6

7

5

6

7

c) Reduction in penetration of residue,
at 25 OC, percent, Max

35

35

35

35

35

35

d) Elastic recovery of half thread in
ductilometer at 25 OC, Percent, Min

50

50

50

35

35

35