Evaluation of Trapezoidal Shaped Grooves

LIST OF FIGURES

Figure

Page

1

Standard and Trapezoidal-Shaped Groove Configurations

1

2

Blades for Standard Grooves

2

3

Blades for Trapezoidal-Shaped Grooves

3

4

Braking Coefficient Versus Groove Spacing at 70 Knots

8

5

Braking Coefficient Versus Groove Spacing at 110 Knots

8

6

Braking Coefficient Versus Groove Spacing at 130 Knots

9

7

Braking Coefficient Versus Groove Spacing at 150 Knots

9

8

Overview of Pavement Test Articles in NAPTF

13

9

Standard and Trapezoidal Grooves Side by Side

14

10

Bridge-Deck Groove-Cutting Machine

15

11

Rotary Drum With Standard Groove Blades

15

12

Rotary Drum With Trapezoidal-shaped Groove Blades

16

13

Trapezoidal-Shaped Grooving Using Bridge-Deck Machine

16

14

Groove-Cutting Machine With Water Supply Hose

17

15 Trapezoidal-Shaped and Standard Grooves in Asphalt Pavement at NAPTF

17

16

Plaster Mold of Trapezoidal-Shaped Groove

18

17

Wheel Tracks and Profile Data Zones

20

18

Clarification of Table 1 Terms

21

19

Trapezoidal-Shaped Groove Profiles for T5, North I

22

20

Standard Groove Profiles for T5, North I

22

21

Location of Trapezoidal-Shaped Groove Test Area

24

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