Sealant Troubleshooting. CAPTG Workshop Toronto September 13 th Tim Morris Crafco Inc
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1 Sealant Troubleshooting CAPTG Workshop Toronto September 13 th 2009 Tim Morris Crafco Inc
2 Why Crack Treatment? Cracks are inevitable, and neglect leads to accelerated cracking and potholing, further reducing pavement serviceability (FHWA-RD )
3 Why Crack Treatment? With proper and timely application, crack sealing and filling can extend pavement life past the point where the costbenefit of added pavement life exceeds the cost of conducting the operation (FHWA-RD )
4 Why Crack Treatment? To prevent this...
5 Pavement Evaluation and Treatment Selection Identify various pavement (cracking) conditions Identify types of cracks i.e. thermal (transverse), longitudinal, block and fatigue (alligator) Identify working (high movement) and non-working (low or no movement) cracks Identify two treatments: crack sealing and performance crack filling
6 Working vs. non-working cracks: Working (high movement)- 3mm movement Thermal Non-working (low or no movement)- < 3mm movement Longitudinal Block Fatigue
7 Sealant Troubleshooting
8 Common Issues Sealant Pulling out of Crack/Adhesion Loss Sealant Tracking Sealant Cracking Sealant Bubbling Bumps in New Overlay Slow Heat Up of Sealant Sealant too Thick Sealant Jelling in Melter/Applicator
9
10 Sealant Pulling out of Crack 1. Dirty / Wet Pavement at Application 2. Ambient Temperature too Cold at Application 3. Weak / Deteriorated Pavement 4. Oil or Moisture Introduced to Crack by Compressor / Pavement Contamination 5. Cracks Previously Sealed and not Clean Sufficiently Prior to Application 6. Incorrect Application 7. Sealant Over Heated / Under Heated 8. Sealant is Contaminated 9. Off-Spec Sealant
11 1,2&4 Dirty/Wet, Too cold to apply &Oil or moisture from the compressor
12 3 Weak Pavement
13
14 5 &8 Previously sealed and not clean, contaminated / incompatible
15 6 Incorrect Application
16 7 Overheated/Under heated
17 Sealant Tracking Excessive Application Traffic Opened too Soon Ambient Temperature Higher than Normal Incorrect Sealant for Condition Sealant Over Heated / Under Heated Sealant is contaminated
18 1 3mm Max
19 Excessive Application
20 2 Blotting materials or Detack agents
21 Sealant Cracking Inappropriate Sealant for Ambient Conditions Excessive Movement at Crack Inappropriate Sealant Geometry (D:W) Improperly Applied Sealant In PCC Joints Backer Rod Not Used Sealant Old Exceeding its Service Life
22 Sealant Geometry
23 Inappropriate sealant for ambient conditions
24 Excessive Movement
25 Sealant exceeding the service life
26 Inappropriate sealant for ambient conditions
27 Improperly applied sealant
28
29
30
31 Sealant Bubbling 1. Moisture Present in Pavement 2. Wrong Backer Rod 3. Contaminated Sealant 4. Leaking Material Pump Packing
32 Surface Moisture
33 Hydration
34
35 Number 1 culprit Moisture
36 Bumps in New Overlay Overlay Construction Related: Use of rollers with power driven front drums. Use of 2 course paving with a thin leveling course. Use of stiffer tack coats. Waiting one or more years after sealing before overlaying. Modifying rolling patterns and temperatures based on operator experience to reduce mix shoving and mix designs. Slowing roller speed during compaction, especially for intermediate and final rolling Rolling to achieve compaction with the minimum number of passes. Do not "over roll" Crack Sealant Related: Install sealant in routed cracks leaving approximately 3/8 inch (1 cm) low in the crack with no sealant in the surface. (When sealing just prior to the overlay) Apply an isolation or non-stick layer or material over the sealant to prevent adherence. (i.e. lime, sand or other coating) Remove excess sealant and/or avoid excessive sealant applications.
37 Slow Heat Up of Sealant Inaccurate Temperature Gauges High Viscosity Sealant Old/Low Heat Transfer Oil Coking of Heat Transfer Oil reservoir Inadequate Melter/Applicator
38 Check and Calibrate Your Gauges
39 Check Your Heat Transfer Oil
40 Sealant too Thick Sealant Under Heated Inexperience with High Rubber % Sealants Old Sealant - Nearing Pot Life Limit
41 APPLICATION LIFE APPLICATION LIFE: Application life when heated to application temperature is approximately 12 to 15 hours and may be extended by adding fresh product as quantity in the melter decreases. Product shall be agitated during installation.
42 Sealant Jelling in Melter/Applicator Sealant was Overheated Sealant Exceeded it s Pot life (heated too Long)
43 APPLICATION LIFE APPLICATION LIFE: Application life when heated to application temperature is approximately 12 to 15 hours and may be extended by adding fresh product as quantity in the melter decreases. Product shall be agitated during installation.
44 BOTTOM LINE
45
46
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