2008 Michigan Seminar on Maintenance of Asphalt Pavements. Mount Pleasant, Michigan. January 8 th & 9 th, 2008

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1 2008 Michigan Seminar on Maintenance of Asphalt Pavements Mount Pleasant, Michigan January 8 th & 9 th, 2008

2 Slurry Seal and Micro Surfacing for Pavement Preservation By W. Pierre Peltier South Central Field Engineering Leader SemMaterials L.P. Southlake, Texas

3 The problem Too many roads, not enough funds The opportunity A sound pavement preservation program to optimize paving funds

4 Pavement Preservation Strategy including all activities to provide & maintain serviceable roadways The right treatment, on the right pavement, at the right time Lower life cycle costs, higher quality pavements Keeping good pavements good

5 Kansas DOT Improvement From PP Program Performance Level Interstate PL1 (Good) Interstate PL3 (Poor) Non-Interstate PL1 (Good) Non-Interstate PL3 (Poor) % of Highway System in Level 100% 90% 80% 70% 60% 50% 40% 30% 20% 10% 0% 43.4% 19.3% 57.6% 11.6% PL-1 are pavements in "good" condition PL-3 are pavements in "poor" condition Data Labels are for the noninterstate system 43.4% 93.1% 49.4% 16.2% 19.3% 60.1% 7.4% 61.9% 6.6% 66.3% 5.3% 63.9% 7.3% 63.1% 5.3% 69.2% 3.4% 78.7% 1.5% 71.9% 6.1% % 7.4% 72.5% 6.5% 72.2% 5.7% 74.9% 4.4% 81.0% 3.5% 84.8% 3.2% 89.6% 1.4% 90.5% 1.0% 91.0% Good 1.2% 93.1% 0.7% Poor 0.7% Courtesy of Dean Testa, KDOT, AASHTO Maintenance Conf. July, 2003

6 What is Pavement Preservation? Asset management Protect investment Enhance cost-effectiveness of treatments Lower life cycle costs Preventive maintenance (PM) seals & protects Extend pavement life Delay future deterioration Enhance pavement performance Improve functional condition e.g. skid resistance Reduce user delays Get in, get out, stay out

7 The Right Time Strategy to Minimize Costs Pavement condition Preventive maintenance treatments Conventional overlay Time or traffic

8 Effective Preventive Maintenance Condition Time $1 for preventive maintenance here Is 3 to 10 times more cost effective than here

9 Slurry Seal A designed mixture of emulsified asphalt, mineral filler, water and specified additives that are proportioned, mixed and uniformly spread over a properly prepared surface. ISSA A-105 ASTM D-3910 City, County, and State DOT Specifications

10 Micro-Surfacing The Right Treatment For: Restoring surface quality & skid resistance Rut filling Quick construction, quick traffic return Weatherproofing Sealing Reducing oxidation Extending the life of asphalt and concrete pavements

11 What is Micro-Surfacing? History Developed in Europe in 1970 s Introduced in U.S. in 1980 Now routinely used in more than 40 states Used for rut filling & texturing

12 Micro-Surfacing A designed mixture of: polymer modified emulsified asphalt mineral aggregate mineral filler water other additives Proportioned, mixed & uniformly spread over a properly prepared surface ISSA A-143 State DOT specifications ASTM D-6372

13 Micro-Surfacing Components Water Additive Micro-Surfacing Emulsion Mineral Filler Aggregate

14 Micro-Surfacing Emulsion emulsifier water acid polymer asphalt Polymer Modified Emulsion MILL

15 Slurry Seal Machine Schematic

16 Slurry Systems how they work through a machine Cement drops on Aggregate Aggregate and Cement drop into pug mill Water the Additive is mixed Emulsified Asphalt is added Materials are mixed and deposited into lay-down box and spread on road surface

17 Micro-Surfacing Machine Schematic Crushed aggregate Cement additive water Polymer Modified Emulsion Direction Spreader box Mixing time 15 to 45 seconds Mixture Brown & Homogeneous Breaking Time 60 to 120 seconds Water Flows Mixture Black Traffic in Approximately One Hour

18 Types and Application Rates Slurry Seal Type I Type II Type III Micro Surfacing Type II Type III Rut filling 6 to 10 lbs./sy 10 to 15 lbs./sy 15 to 25 lbs./sy 12 to 20 lbs./sy 18 to 28 lbs./sy 30 lbs + (1/2 to 2 inch)

19 Micro-Surfacing Machine (1) Aggregate bin (2) Mineral filler bin (3) Additive storage (4) Metered aggregate (5) Metered micro-surfacing emulsion (6) Metered water & additive (7) Pugmill (8) Micro-surfacing (9) Surfacing spreader box (10) Brown to black color (11) Road water spray bar

20 Polymer Modified Residual Asphalt Reduces temperature susceptibility Polymer either mixed into the AC, or co-milled with the AC in making the emulsion Minimum of 3% polymer solids based on AC content of emulsion

21 Micro-Surfacing Mix can be placed in thicker lifts and still remain stable Mix retains macrotexture Quick setting for quick traffic return Enhanced durability

22 Slurry Seal Machines History of Machines

23 This is a picture of a slurry seal machine in the 1950s. Slurry seal machines have come a long way.

24

25 Micro-Surfacing Machine Continuous Self-Propelled Unit with Support Unit

26 Continuously Run & Self-Propelled

27 Continuous Lay Down

28 Continuously Run Machine with Support Unit

29 Support Unit Connected To Continuously Run Machine

30 Multi-Bladed Pugmill

31 The Micro-Surfacing Process Click to run movie clip

32 Construction Quality Slurry Systems

33 Appropriate Specifications Specifications should describe & match the job Specifications should describe & meet your expectations

34 Laboratory Design Procedures Pavement description Treatment objectives Selection of individual components Mix formulation Physical testing of trial mixes Field verification

35 Calibration

36 Why Do We Calibrate? To obtain the ratio of the mix as set forth in the mix design

37 Emulsion Calibration Sheet

38 Aggregate Calibration Work Sheet

39 Graph Template

40 Calibration Summary

41 Surface Preparation Crack sealing Asphalt patching Clean the surface Sweep - wash Pavement marking removal Tape paint Cover the utilities Remove reflective pavement markers

42 Crack Filled Street

43 Asphalt Patch

44 Road Contaminants

45

46 Typical Slurry Seal Candidate

47 Residential & Low Volume Streets

48 East Coast Residential City

49 Excellent Preventive Maintenance Candidate

50 Parking Lot

51 Major Arterial Roads Henderson, Nevada

52 Course Rock Mix - Stone Loss

53 Airport

54 Shoulder Work

55 Raveled Surface

56 Cracking

57 Cannot Work Miracles

58 Right Treatment, Right Time, Right Place

59 Stockpile Setup

60 Stockpile Setup

61 Types & Application Rates Type II Type III Micro-Surfacing 15 to 24 lbs./sy 18 to 28 lbs./sy

62 Ruts < ½ May Be Filled With Scratch Course Steel Strike Off Scratches Surface o o o o o o o o o o Pavement Full Width Lane The scratch coat is generally 6 less than the width of the lane.

63 Applying Leveling Course

64 Leveling Course Applied

65 Reprofiling Rutted Wheelpaths For each inch of applied Micro-Surfacing mix, add 1/8 to 1/4 crown to each rutfill to compensate for return traffic compaction Original Pavement Cross Section Crown Micro-Surfacing Mix Micro-Surfacing Mix Ruts in Wheelpath Ruts 1/2 & over must use the rut box

66 Rut Filling Lay Down Box

67 Filling Ruts Before After

68 Rut Fill & Strike Off Setting strike-off

69 Operating Rut Box

70 Rut-filling Before After

71 Surface Course

72 Material Placement

73 Secondary Strike-Off

74 Feathering Center Joint

75 Smooth Ride Textured Wearing Surface

76 Good Straight Edge Lines

77 Why do Surface Treatments Fail? Material incompatibility Improper pavement preparation Control of materials during application Traffic control Working too late in the season Improper road selection

78 Debonding/ Delaminating

79 The Right Pavements for Slurry Systems

80 Interstates

81 Interstates

82 Major Arterials

83 Major Arterials

84 Secondary State Routes

85 Residential Streets

86 Rural Roads

87 Rural Roads

88 Rutted Pavements With Minor Flushing

89 Flushing

90 Rut Fill With Surface Course

91 Raveled Surface

92 Micro-Surfacing at Night

93 Slurry Systems Can t Work Miracles

94 Before & After Micro-Surfacing

95 Micro-Surfacing Project: Before

96 Micro-Surfacing Project: After

97 Benefits of Micro-Surfacing Restoration of surface properties Rut-filling Sealing & waterproofing Delineates pavement markings & shoulders High performance wearing course

98 Benefits of Micro-Surfacing Preserves investment Quick traffic, 1 hour or less Minimizes traffic disruptions Cost effective Can be warranted No appurtenance adjustments Night time placement

99 Typical Slurry Systems Costs Price varies depending upon treatment Surface course Leveling & surface Rut-fill & surface Typical life - 5 to 12 years Depends upon condition of pre-existing pavement, construction quality, climate, traffic and other factors

100 The Right Treatments Estimated Life Extension (years) Treatment Fog Seal Good Condition (PCI=80) 3-5 Fair Condition (PCI=60) 1-3 Poor Condition (PCI=40) 1-2 Chip Seal Slurry Seal Micro-surfacing Thin HMA

101 Summary Micro-surfacing, the right treatment for Rutfilling Texturizing Improving skid resistance Sealing out moisture Ultrathin surfacing Quick construction & traffic return Cost-effective pavement preservation

102 Thank You

103 Thank you!!