Specification for Penetration Grade Bitumen 80/100

Property Range Standard Specific Gravity @ 25/25’C 1.00/1.05 D-70
Penetration @ 25’C 80/100 D-5
Softening Point’C 45/52 D-36
Ductility @25’C 100 min D-113
Loss on Heating (wt)% 0.5 max D-6
Drop in Penetration after Heating % 20 max D-6 & D-5
Flash Point’C 225 min D-92
Solubility in CS2(wt)% 99.5 max D-4
Organic Matter Insoluble in CS2(wt) % 0.2 max D-4
Spot test Negative *A.A.S.H.O.T.102

Specification for Penetration Grade Bitumen 60/70

Property Range Standard
Specific Gravity @ 25/25’C 1.01/1.06 D-70
Penetration @ 25’C 60/70 D-5
Softening Point’C 49/56 D-36
Ductility @25’C 100 min D-113
Loss on Heating (wt)% 0.2 max D-6
Drop in Penetration after Heating % 20 max D-6 & D-5
Flash Point’C 250 min D-92
Solubility in CS2(wt)% 99.5 min D-4
Spot test Negative *A.A.S.H.O.T.102

Specification for Penetration Grade Bitumen 40/50

Prpoerty Range Standard
Penetration @ 25 Deg c 40/50 D.5
Softening Point Deg.c 52/60 D.36
Ductility @ 25 Deg.c 100 MIN D.113
Loss On Heating % Wt 0.2 MAX D.6
Flash Point Deg.c 250 MIN D.92
Solubility In CS2 %Wt 99.05 MIN D.4
Drop In Penetration After Heating 20 MAX D.5
Density @ 25 Deg. c 1.01/1.06 D.70-D.3289

Cutback Bitumens (liquid Bitumens) are Bitumens that are dissolved in a petroleum solvent (cutter). Typical solvents include naptha (gasoline) and kerosene. The type of solvent controls the curing time of the cutback and thus when it will obtain its ultimate strength. Rapid curing cutbacks use naptha (gasoline) while medium curing cutbacks use kerosene. The amount of cutter affects the viscosity of the cutback Bitumen. The higher the cutter content, the lower the viscosity and the more fluid it will be.

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The advantage cutbacks have over emulsions is a much higher residual Bitumen percent, typically over 80 percent. This compares with just over 65 percent for Bitumen emulsions. The result is more Bitumen cement left on the roadway after curing, for the same volume of binder applied.

Cutback Classification

Cutbacks are divided into two classifications, Rapid-Curing (RC) and Medium-Curing (MC)
depending on the solvent used. They are further defined by a number which indicates the minimum kinematic viscosity (fluidity) of the cutback. The lower the number, the more fluid the cutback is.

Grades & Properties

* Kinematic Viscosity at 140 deg F ( 60 deg C), in Centistokes , Penetration of Residue at 77 deg F (25 deg C) , 100 grams, 5 seconds.

Detailed Specifications

Medium Curing Cut Back Bitumen MC30

Properties Range Standard

Kinemalic 1 viscosity at 60°C, eSt 30 /60 ASTM D2170
Flash Point (Tag Open-Cup),°C 38 / - ASTM D1310
Distillate test :
Distillate, percent by Volume of total Distillate to 360°C
To 190°C - / 15 ASTM D402
To 225°C 20 / 60 ASTM D402
To 260°C 50 / 90 ASTM D402
To 316°C 80 / 100 ASTM D402
Residue from distillation to 360°C, percent volume by different
Test on residue from distillation 50 / -
Penetration at 25°C,100g, 5 sec.
Ductility 3 at 25°C, cm 120 / 250 ASTM D402 / ASTM D5
Solubility in trichloroethylene, 100 / - ASTM D402 / ASTM D113
Water, percent volume 99.0 / - ASTM D402 / ASTM D2024
Water, percent volume - / 0.2 ASTM D95

Medium Curing Cut Back Bitumen MC70

Properties Range Standard

Kinemalic 1 viscosity at 60°C, eSt 70 /140 ASTM D2170
Flash Point (Tag Open-Cup),°C 38 / - ASTM D1310
Distillate test :
Distillate, percent by Volume of total Distillate to 360°C
To 190°C - / 10 ASTM D402
To 225°C 20 / 55 ASTM D402
To 260°C 40 / 80 ASTM D402
To 316°C 75 / 95 ASTM D402
Residue from distillation to 360°C, percent volume by different
Test on residue from distillation 55 / -
Penetration at 25°C,100g, 5 sec.
Ductility 3 at 25°C, cm 120 / 250 ASTM D402 / ASTM D5
Solubility in trichloroethylene, 100 / - ASTM D402 / ASTM D113
Water, percent volume 99.0 / - ASTM D402 / ASTM D2024
Water, percent volume - / 0.2 ASTM D95

Medium Curing Cutback MC3000

Properties Min Max
Kinematic viscosity at 600C (140 0F), centistrokes, 3000 6000
Flash point (Tag. Open Cup), [0C (0F)] 66(150) …
Water percent … 0.2
Distillation test:
Distillate percentage by volume of total distillates to 260 0C (500 0F) 0 15
Distillate percentage by volume of total distillates to 316 0C (600 0F) 15 75
Residue from distillation to 360 0C (680 0F) percent volume by difference 80 …
Test on residue from distillation:
Viscosity at 600C, (1400F), P or 300 1200
Penetration, 100g, 5sec, at 250C (770F), [dmm] 120 250
Ductility, 5cm/min, at 250C (770F), cm or 100 …
Ductility at 15.50C (600F), cm (See “Note 1”) 100 …
Solubility in Trichloroethylene, percent by weight, [%] 99 …
Spot test: (see ‘’Note’’)
Standard naphtha Negative Negative
Naphtha-xylene solvent, percent xylene Negative Negative
Heptane-xylene solvent, percent xylene Negative Negative

Sampling and Testing Standards for Cut Back Bitumen

Type o f T e s t Standards
AASHTO ASTM
Sampling T40 D140
Kinematic Viscosity T201 D2170
Flash point T79 D1310
Water T55 D95
Distillation T78 D402
Penetration T49 D5
Ductility T51 D113
Solubility in trichloroethylene T44 D2042
Spot test T102