Direct Tension Test The Direct Tension Test provides a information - - PowerPoint PPT Presentation

Direct Tension Test

The Direct Tension Test provides a information on facture and strain tolerance of the binder.

New low temperature binder Spec. Thermal stress compared to strength

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

• 40
• 34
• 28
• 22
• 16
• 10
• 4

2 8 Temperature, °C Strain at Failure, % 10/20

50/70 EVA_Modified SBS_Modified

Strain at Failure vs Temperature

Superpave Plus Specifications

The Direct Tension Tester provides information on the strain tolerance and fracture properties of the binder. The strain at Tcr + 3°C can tell a lot about what is in the binder.

DT Strains by Modifier Type

79.4 79.1 87.6 66.5 73.8 63.6 75.2 82.4 Phase Angle 1.94

• 31

EVA 70-31 1.57

• 33

EVA GRF 70-31 1.64

• 23
• 70-24

3.60

• 29

SB/ 6% 76-29 3.87

• 27

SBS/ 4% 70-25 3.61

• 29

SBS/ 4.25% 82-27 3.22

• 27

SBR/ 3% 70-27 1.63

• 19

Novophalt 76-23 Strain Tcr+ 3 Tcr Modifier PG Grade

PCCAS Binder Study

86.7 74.5 86 Delta Original 2.25

• 30.5
• 29.7

B – 3

66.1-29.7

2.55

• 32.8
• 30.9

B – 2

63.4-30.9

1.27

• 22.8
• 23.8

B –1

65.7-23.8

Strain Tcr+ 3 Tcr DTT Tcr BBR PG Grade

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• 40
• 34
• 28
• 22
• 16
• 10

Temperature, °C Strain at Failure, %

PG 64-22, Unmodified B-2, 3% SBS PMA PSR, 4% SBS PMA Tcr + 3°C

Strain @ Failure for Tcr + 3°C