Longitudinal Joint Construction Mike Robinson, PE
Inherently weaker than surrounding pavement Prone to deterioration Often drives rehabilitation FOD Longitudinal Joints Two predictors of success Density / Compaction Permeability National Association of County Engineers November 4, 2010 Mike Robinson 2
Echelon Paving National Association of County Engineers November 4, 2010 Mike Robinson 3
National Association of County Engineers November 4, 2010 Mike Robinson 4
Locate Joints Away From Loads National Association of County Engineers November 4, 2010 Mike Robinson 5
National Association of County Engineers November 4, 2010 Mike Robinson 6
Paving the First Pass Hot Mix Asphalt Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 7
Steel Drum Roller Hot Mix Asphalt Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 8
Steel Drum Roller Hot Mix Asphalt Hot Mix Asphalt Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 9
Paving the First Pass Steel Drum Roller Hot Mix Asphalt Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 10
Paving the First Pass Steel Drum Roller Hot Mix Asphalt Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 11
National Association of County Engineers November 4, 2010 Mike Robinson 12
Paving the First Pass Compacted HMA Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 13
Need to Protect Cold Side National Association of County Engineers November 4, 2010 Mike Robinson 14
Paving the Second Pass Compacted HMA Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 15
Raking the Second Pass Compacted HMA Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 16
Raking the Second Pass Steel Drum Roller Compacted HMA Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 17
This pavement is many years old note load-related failure prior to joint failure. Fundamentals of a Good Joint Maximize lateral support / minimize shear during rolling Keep material at the joint Keep the surface level National Association of County Engineers November 4, 2010 Mike Robinson 18
Proper Surface Prep & Tack Coat National Association of County Engineers November 4, 2010 Mike Robinson 19
End of Auger Proper Paver Setup National Association of County Engineers November 4, 2010 Mike Robinson 20
Extend Tunnels & Augers National Association of County Engineers November 4, 2010 Mike Robinson 21
Extend Tunnels & Augers National Association of County Engineers November 4, 2010 Mike Robinson 22
National Association of County Engineers November 4, 2010 Mike Robinson 23 Pave in a Straight Line
Overlap About 1 & Adjust End Gate National Association of County Engineers November 4, 2010 Mike Robinson 24
National Association of County Engineers November 4, 2010 Mike Robinson 25
DON T RAKE THE JOINT! AND STOP BROADCASTING ROCKS ACROSS THE MAT! National Association of County Engineers November 4, 2010 Mike Robinson 26
Overhang About 6 From Hot Side National Association of County Engineers November 4, 2010 Mike Robinson 27
Pneumatic Rollers Recommended National Association of County Engineers November 4, 2010 Mike Robinson 28
Joint Adhesive National Association of County Engineers November 4, 2010 Mike Robinson 29
Joint Adhesive And pave in a straight line! National Association of County Engineers November 4, 2010 Mike Robinson 30
Cutting Off Edge of First Pass Steel Drum Roller Compacted HMA Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 31
Sawcutting National Association of County Engineers November 4, 2010 Mike Robinson 32
Pizza Cutter National Association of County Engineers November 4, 2010 Mike Robinson 33
Thank You! Pizza Cutter National Association of County Engineers November 4, 2010 Mike Robinson 34
Cold Milling National Association of County Engineers November 4, 2010 Mike Robinson 35
Notched Wedge Joint Photo courtesy of WSDOT National Association of County Engineers November 4, 2010 Mike Robinson 36
Notched Wedge Compacted HMA Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 37
Traffic Over Notched Wedge Compacted HMA Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 38
Notched Wedge Steel Drum Roller Compacted HMA Subgrade / Base / Bottom Lift National Association of County Engineers November 4, 2010 Mike Robinson 39
Test For Compaction National Association of County Engineers November 4, 2010 Mike Robinson 40
2006 Caltrans Standard Specifications Sec 39 3 rollers 8-ton steel 12-ton steel, 40 diameter or greater Pneumatic-tired Well, actually, you only need the pneumatic if it is a leveling course or is less than 0.20 feet thick First coverage at 250 o F+ Breakdown complete by 200 o F National Association of County Engineers November 4, 2010 Mike Robinson 41
2006 Caltrans Standard Specifications Sec 39 Ambient temperature requirements Lift thickness requirements LONGITUDINAL JOINTS! Correspond with edges of traffic lanes Offset at least 6 Through lane paved first Transverse joints shall be trimmed to vertical National Association of County Engineers November 4, 2010 Mike Robinson 42
2006 Caltrans Standard Specifications Sec 39 COMPACTING! Roll low to high Breakdown - Three coverages with 12-ton steel Followed immediately by three coverages with pneumatic must be at least 150 o F (maybe there are exemptions for the pneumatic) One final coverage with 8-ton steel without delay National Association of County Engineers November 4, 2010 Mike Robinson 43
Revised Section 39 July of 2007 Mat thickness Longitudinal joint location & offset Through lanes first Sawcut or grind existing pavement edges to vertical Sawcut or grind longitudinal construction joints if they are damaged or not placed to a neat line National Association of County Engineers November 4, 2010 Mike Robinson 44
Revised Section 39 July of 2007 Temperature requirements for finish rolling Three types of placement: Standard Method Quality Control / Quality Assurance National Association of County Engineers November 4, 2010 Mike Robinson 45
Standard Placement Establish, implement, and maintain a Quality Control Plan Quality control testing frequencies listed 91%-97% of maximum theoretical density per 375 At least 0.3 meters (1 foot) from edge Acceptance testing frequencies listed Same compaction requirements National Association of County Engineers November 4, 2010 Mike Robinson 46
No compaction testing Method Placement 3 rollers, temperature requirements, coverages, etc. similar to 2006 Section 39 National Association of County Engineers November 4, 2010 Mike Robinson 47
Quality Control / Quality Assurance Placement Quality Control Plan Minimum QC sampling & testing frequencies 92% - 96% of maximum theoretical density per 375 At least 0.3 meters (1 foot) from edge Statistical evaluation Acceptance testing frequencies listed Same compaction requirements National Association of County Engineers November 4, 2010 Mike Robinson 48
Write Your Own FAA AC 150/5370-10E P-401 401-4.12 Joints 401-5.1.b.(2) Joint Density 401-5.2.b.(3) PWL acceptance Joint density target usually 2% - 3% lower than mat density National Association of County Engineers November 4, 2010 Mike Robinson 49
Important Things to Remember Keep Material at the Joint Proper subgrade prep / tack coat Proper paver setup Pave in a straight line Overlap first lane by about 1 DO NOT RAKE THE JOINT! Overhang the roller from the hot side National Association of County Engineers November 4, 2010 Mike Robinson 50
Important Things to Remember Material Needs to be Hot Keep breakdown rollers close to the paver Roll as hot as possible with pneumatic Warm joints are better than cold National Association of County Engineers November 4, 2010 Mike Robinson 51
Keep Rollers Close to Paver National Association of County Engineers November 4, 2010 Mike Robinson 52
Important Things to Remember If You Cut the Joint Cut in a straight line Clean up You still need to build the hot side properly National Association of County Engineers November 4, 2010 Mike Robinson 53
Testing Is The Only Way to Know How You ve Done National Association of County Engineers November 4, 2010 Mike Robinson 54
And You Still Need to Keep Joints Away From Loads National Association of County Engineers November 4, 2010 Mike Robinson 55