INTELLIGENT COMPACTION MYTHS & METHODS AASHTO SAN FRANCISCO, CALIFORNIA AUGUST 15, 2012

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1 INTELLIGENT COMPACTION MYTHS & METHODS AASHTO SAN FRANCISCO, CALIFORNIA AUGUST 15, 2012

2 INTELLIGENT COMPACTION CHUCK DEAHL BOMAG AMERICAS

3 Intelligent Compaction? WHAT IS INTELLIGENT COMPACTION

4 INTELLIGENT COMPACTION IS: A SYSTEM FOR MEASURING THE STIFFNESS OF HMA ON THE ROLLER A RECORDING OF THAT STIFFNESS MEASUREMENT; IS A GOOD PROOF ROLLER PROOF OF THE STIFFNESS OF THE HMA AS RELATED TO DENSITY PROVIDES INFORMATION FOR THE ROLLER TO MAKE DECISIONS NOT THE ROLLER OPERATOR A QUALITY CONTROL SYSTEM THAT PROVIDES FEEDBACK ON MATERIAL STIFFNESS AS RELATED TO THE NUMBER OF PASSES MADE AND LOCATION OF

5 MYTHS

6 INTELLIGENT COMPACTION IS NOT: A SYSTEM THAT MEASURES DENSITY ALWAYS AN ACCURATE MEASUREMENT OF STIFFNESS AS RELATED TO DENSITY; IT DEPENDS ON QUALITY OF BASE NEEDED ON ALL ROLLERS

7 What is intelligence the ability to adapt its behavior in response to varying situations and requirements

8 COMPACTION Is a mechanical process: compresses HMA into a smaller denser volume after placement by applying one or more of the 4 forces of compaction Increases mixture stability: forces asphalt coated aggregate particles closer together achieves particle to particle contact

9 IMPORTANCE OF COMPACTION IMPROVE MECHANICAL STABILITY IMPROVE RESISTANCE TO PERMANENT DEFORMATION REDUCE MOISTURE PENETRATION IMPROVE FATIGUE RESISTANCE

10 COMMUNICATION COMPACTION GOALS DENSITY SMOOTHNESS BALANCED PRODUCTION

11 4 FORCES OF COMPACTION PRESSURE: A DOWNWARD FORCE IMPACT: A HAMMER BLOW VIBRATION: A RAPID SERIES OF IMPACT BLOWS MANIPULATION: KNEADING IN A CONFINED MANNER

12 METHODS

13

14 3 TYPES OF VIBRATORY SYSTEMS ROTARY- STANDARD SYSTEM ON MOST VIBRATORY ROLLERS OSCILLATION- MOVEMENT OF DRUM IS OSCILLATING DIRECTED- MAXIMUM FORCE IN VERTICAL MOVEMENT OF DRUM

15 Exciter systems Rotating exciter Oscillation Directed Exciter Rotating Amplitude Circular Amplitude Directed Amplitude

16 Exciter systems Rotating Exciter Oszillation Directed Exciter Asphalt Manager Rotating Amplitude Circular Amplitude Directed Amplitude any any horizontal vertical direction Vertical

17 EXCITER METHODS Rotary exciter Oscillation Directed exciter s s s

18 Exciter Method Variation Rotary exciter Directed exciter s s True Intelligent Compaction

19 IC for Asphalt

20 Asphalt Manager with new measuring value E VIB [MN/m²] and temperature gauge

21 Asphalt Manager Versatility Horizontal Vector # 4 Mid Vector # 6 Vertical Vector

22 Vario Directed Exciter From Horizontal to Vertical 6 Force Outputs Created by Vectoring

23 Bomag Operational Panel 0 fixed variable 0,2 mm 0-0,2 mm 0,4 0,6 0-0,6 0,7 0,93 0-0,93 6 x 3 x Manual - Auto Compaction Modes 0,08 in 0,24 in 0,37 in

24 NEEDED FOR COMPACTION CORRECT MIX TEMPERATURE CONFINMENT

25 BOP Screen

26

27

28 Bomag Operational Panel PRINTER - Start - Stop - Print out - Delete Test procedere: - Mark the track to be compacted - Manual operation mode with - Fixed amplitude - Fixed working speed

29 On Board Printer

30 Basic Printed Documentation Number of Passes Temperature Evibe Min and Max Evibe Average Frequency Average Speed Track Length

31 EVIB prof Target values MN/m² T C 130 C 0,5 mm Working range C Thickness Depth effect Manual operation A B C Thickness prof 130 C 0,5 mm BOMAG GmbH Slide 32 Documentation

32 EVIB - Target value control curve Selected value Force level Target value Measured value Increase of stiffness EVIB target value Actual stiffness Target amplitude Force level and target value of the selected asphalt layer define control curve. Control curve and actual measured stiffness define the setting of the target amplitude.

33

34

35 E VIB and Density as function of passes; BW 174 AD Asphalt Manager, Automatic mode; Asphalt Base 0/32 CS B65, Nürnberg A3 E VIB [MN/m²], [ C] Evib Surface temp. Core temp. Troxler density [%] 4 cm SMA 0/11 S 8 cm Binder 0/22 > 10 cm ATS 0/ Passes

36

37 A PROOF ROLLER

38 IC BVC Performance

39 Minnesota Highway Site 2007 Optional Pad Shell Kit

40 Minnesota Highway Site 2007 Optional Pad Shell Kit

41 Electronic Documentation BCM05 Display

42 BCM05 Documentation

43 Minnesota Highway Site 2007

44 Documented Low Stiffness A

45 Documented Low Stiffness A ill have repeat failure without drainag

46 GPS / positioning with Reference Station Two GPS Antenna Reference station ( Trimble ) High accuracy ( 5cm ) RTK ( real time ) BCM 05 positioning software

47 Big scale projects SPHALT MANAGER with E VIB - docu Option: BCM 05 for GPS application BOMAG GmbH Slide 48

48 Outlook: DATA-LINK BOMAG GmbH Slide 49

49 On Site QA Tests W Layfayette IN - ICPF Site 2009

50 Colorado State Highway 2008

51 2 PASSES VERSUS 3 IN TEST STRIP

52

53 ULTIMATE SMOOTHNESS ONE DRUM VIBRATING IN HORIZONTAL VIBRATION DIRECTION-- -FRONT DRUM REAR DRUM SHUT OFF 13/4INCH LOOSE LIFT 2PASSES- DENSITY 93.7% MTD SMOOTHNESS IRI MEASURED WITH A LAZER MOUNTED VEHICLE

54

55

56

57 $ VALUE I/C MEASURES THE STIFFNESS OF A LIFT OF HMA DENSOMETERS MEASURE DENSITY OF HMA THIS GIVES US TWO MEASUREMENTS OF THE STABILITY OF THE HMA WHY CUT SO MANY CORES THAT COST $ $ A CORE

58

59

60 IC Vario Benefits Why IC??? Enhances Quality Control Consistent Rolling Patterns Exceptional Compaction Performance Real Time Data Display Wide Range of Adaptability Reduced Shock Loads to Surroundings Increased Depth Effect Proof Rolling to identify soft spots Under Compaction is avoided Over Compaction is avoided Unnecessary Passes are avoided Yields Fuel and Labor Savings Reduces In-Situ Measurements / Cost Reduces Highway Maintenance / Repair Provides Clear Documentation

61 BEST PRACTICE KNOW THE SPECIFICATIONS KNOW THE OPERATION OF THE ROLLERS BALANCE PRODUCTION

62 Smoothness Frequency & Travel Speed

63

64

65

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