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!!