lessons learned - state of delaware · lessons learned consider a pre-pave meeting a pre–paving...
TRANSCRIPT
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2012 WINTER WORKSHOP
LESSONS LEARNED Hot/Warm Mix Asphalt Pavement
Longitudinal Joints
1
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WARNING Some photos in this presentation may be disturbing to the audience
Viewer discretion is advised
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What Causes Longitudinal Joint Cracking?
•Low density which occurs at the unconfined edge when the first lane is paved. •Temperature and environmental forces. •Insufficient material to allow for roll down to match final grade between the two passes. •Residual stress occurring at the wheel path. •Irregular joint lines.
LESSONS LEARNED
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Longitudinal joints between lanes of hot-mix asphalt (HMA) pavements are commonly more susceptible to moisture damage and other failures.
Therefore it is necessary to evaluate current paving practices to minimize longitudinal joint failure.
LESSONS LEARNED
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LESSONS LEARNED
Making a Straight First Paver Pass
To assure a true line when paving, closely follow lines or markings placed for this purpose. Making a straight first pass is crucial in building a quality joint.
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LESSONS LEARNED
What We Don’t Want
An irregular first pass will be impossible to match on the second pass to achieve the needed consistent overlap of 1 to 1 ½” of the paver screed.
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LESSONS LEARNED
No Drinking & Paving
Consumption of Alcohol impairs the ability to pave a straight line.
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LESSONS LEARNED
No Snake Rodeos
As tempting as it may be, refrain from chasing these down the road.
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LESSONS LEARNED
What caused this?
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LESSONS LEARNED
In Case You Said Radius
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LESSONS LEARNED
The reward for a job well done, is to have
done it.
Ralph Waldo Emerson
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LESSONS LEARNED
Proof Straight Paving is Possible
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LESSONS LEARNED
Irregular Joints Results in This If there is too little or no overlap, the joint may be starved of material and can result in large voids or very low in place densities
Voids at joint caused by insufficient material at joint interface
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LESSONS LEARNED
What Can We Do?
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LESSONS LEARNED
Use a Reference Line
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LESSONS LEARNED
Use a Reference Line
Subsection 401.08 Placing Bituminous Mixtures. The Contractor is required to carefully plan the placement of the surface course to ensure that the joints in the surface course will correspond with the traffic lanes. Longitudinal joints must be parallel to the centerline. The Contractor must establish and follow reference lines or other approved markings to control the true alignment of the longitudinal joints.
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LESSONS LEARNED
Consider a Pre-Pave Meeting
Developing a good paving plan ensures that all parties understand what is expected and essential for the project to be successful.
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LESSONS LEARNED
Consider a Pre-Pave Meeting
A pre–paving meeting can be as formal or informal as you desire, however, remember that the purpose of the meeting is for all the parties involved in the project to be aware of each party’s responsibilities. This will help the project to proceed smoothly and resolve any potential conflicts and misunderstandings before they happen.
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LESSONS LEARNED
Pre-Pave Meeting Topics • Weather and Seasonal Limitations
• Review the Specifications • Material Release Requirements/Expectations
• Safety Requirements • Apparel • Temporary Traffic Control Plan • Condition of Traffic Control Devices • Lighting requirements • Set up and Breakdown Requirements • Vertical Differences • Temporary Pavement Markings
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LESSONS LEARNED
Pre-Pave Meeting Topics (cont’d.) • Production Rates
• Tons/Hour • Monitoring Lane Restriction Lengths
• Equipment • Paver(s)
• Profile Control • Slope Control (Establish Slope %)
• Roller(s) • Adequate Size • Proper Speed (No Waves) • Operating Spray Bars
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LESSONS LEARNED
Pre-Pave Meeting Topics (cont’d.)
• Hauling Equipment • Clean Bodies • Release Agents
• Mechanical Failures • Plant Notification • Time Allowance (Rejecting Material) • Emergency Joint Requirements
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LESSONS LEARNED
Pre-Pave Meeting Topics (cont’d.)
• Condition of Existing Pavement • Necessary Repairs • Clean / Dry Surface • Edges Clipped Back • Proper Tack Application
• Construction Methods • Delivery Rate to Prevent Paver Stoppage • Pull Limits • Match-up Requirements
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LESSONS LEARNED
Pre-Pave Meeting Topics (cont’d.)
• Compaction • Review Specifications & Provision (401699)
• Quality Control Requirements • Table 5a Notification Procedures • Quality Assurance Requirements • Dispute Resolution
• Drive Wheel Toward the Paver • Ability to keep up with paver
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LESSONS LEARNED
Pre-Pave Meeting Topics (cont’d.)
• Joints • Review Specification Requirements
• Alignment • Vertical Face • Adequate Material
• Layout • Overlap of Successive Courses • Final Lift Must Correspond with Traffic
Lanes
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LESSONS LEARNED
Pre-Pave Meeting Topics (cont’d.)
• Surface Tolerance • Review Specifications
• Excessive Deviation Correction Methods • Review Rideability Provision 401580
(if applicable) • Project Classification • Testing Requirements • Test Data Submissions • Equipment Calibration Requirements
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LESSONS LEARNED
Final Striping Plan
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LESSONS LEARNED
Final Lift Joint Layout Plan
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LESSONS LEARNED
Placing the Stripe on the Joint
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LESSONS LEARNED
Which Eventually Results In This
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LESSONS LEARNED
Recap •Longitudinal Joints are more susceptible to failure •Straight line paving is crucial •Communication is paramount •Gather the Required Information •Establish a Plan of Attack •Coordination •Should we have a Joint Density Requirement?
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LESSONS LEARNED
Questions?
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LESSONS LEARNED
Thank you for your attention