Concrete Pavement Preventative Maintenance. Kerry Sutton, PE Director of Engineering SE Michigan Michigan Concrete Association
Concrete Pavement Preventative Maintenance Kerry Sutton, PE Director of Engineering – SE Michigan Michigan Concrete Association
Objectives Define ...
Concrete Pavement Preventative Maintenance Kerry Sutton, PE Director of Engineering – SE Michigan Michigan Concrete Association
Objectives Define concrete pavement preventative maintenance and
where it fits in to the preservation scheme.
Identify various concrete pavement maintenance
treatments …the right treatment at the right time!
List the major components of a concrete pavement
evaluation.
Current MDOT preventative maintenance field
demonstrations/new treatments.
What is Pavement Preservation? • Network level, long-term strategy • Focus on extending pavement life and restoring functional condition • Goals accomplished with preventive maintenance, minor rehabilitation, and routine maintenance
• • • •
What is Preventive Maintenance?
Cost effective treatments Applied to structurally sound pavements Maintain or improve functional condition Does not increase structural capacity
Pavement Preservation Philosophy
Keeping good roads in good condition!
Evaluating Pavements for Pavement Preservation • • • •
What you don’t see may be more important than what you do see! In other words, we need to pay attention to what may be going on underneath the pavement.
Favorable Characteristics for Preventative Maintenance • Few or limited structural problems • No materials-related distress • Pavements in overall relatively good condition (minimal distress)
• • • • • • •
Concrete Pavement Maintenance Treatments
Slab stabilization Partial-depth repairs Full-depth repairs Retrofitted edge drains Load transfer restoration Diamond grinding and grooving Joint resealing
How do these treatments differ from routine/reactive treatments?
Similar treatments… different TIMING!
Maintenance & Rehabilitation Types vs. Condition/Time
Pavement Condition
Good
Poor
Preventive Maintenance
Pavement Preservation window
Reconstruction
Rehabilitation
Maintenance Time
PCC Problems that can be Reduced or Slowed with Preventive Maintenance • Loss of fines (pumping due to high speed, trucks) • Corner breaks • Joint faulting • Joint spalling • Joint seal damage • Crack deterioration • Roughness • Blow-ups
The best way to Reduce or Slow the problems… • Keep water and incompressibles out of cracks and joints. • Make sure our bases are draining properly. • Keep the pavement out of a bathtub! • Evaluate the use of pavement deicers as they may be contributing to early age durability issues…Chlorides in Salt + Ca(OH)2 = Calcium Oxychloride
When Is It Too Late for Preventive Maintenance? • • • • •
Better informed decisions Higher customer satisfaction Improved strategies and techniques Improved pavement condition Cost savings Increased safety So, where do we start!
Key Pavement Evaluation Components • Pavement Condition Survey – look for cracks • Drainage Surveys – look drainage issues (joints, outlets, ditches) • Roughness – ride quality Which activity is most useful in identifying candidate preservation projects?
Pavement Condition and Drainage Surveys
State/Local PM Initiatives • Preservation Engineer or other dedicated staff • Manuals of Practice • Test sections of various treatments • Research and training • Links between preventive maintenance and pavement management • Dedicated funding, budgeting…KEY!
Example Condition Manuals
• Standardized distress definitions • Better agency communication and use of performance information
Output of Distress Surveys
• Distress types and quantities • Overall indicator of condition (PAVER, PASER, State DOT procedures)
PCI 100 85 70 55 40 25 10 0
Example Index
Repair Type
EXCELLENT VERY GOOD GOOD FAIR POOR VERY POOR FAILED
Preventive Maintenance Minor to Major Rehabilitation Reconstruction
PCC Problems that can be Reduced with Preventive Maintenance • Loss of fines (pumping due to high speed, trucks) • Corner breaks • Joint faulting • Joint spalling • Crack deterioration • Roughness • Blow-ups
What are is our biggest challenges in Michigan?
And where can we get the biggest bang for our buck with preventative maintenance?
• • • • • • • • •
Concrete Pavement Maintenance Treatments
Slab stabilization Partial-depth repairs Full-depth repairs Retrofitted edge drains Load transfer restoration Diamond grinding and grooving Joint resealing Crack sealing Cleaning outlets and drains
Joint Resealing 1. 2. 3. 4. 5.
Procedure
Sealant removal Joint refacing Joint reservoir cleaning Backer rod installation New sealant installation
Joint Reservoir Design Common Configurations
Recessed
Backer Rod
Sealant
Flush-Filled
Overbanded
Joint Resealing Candidate??? 1. 15 year old pavement 2. Pre-formed joint sealant 3. ½” joint width
Joint Resealing Candidate???
Joint Resealing
Candidate??? 1. 14 year old pavement 2. Hot pour joint sealant 3. ½” joint width
Joint Resealing Candidate???
Crack Sealing Procedure 1. 2. 3. 4.
Crack sawing Cleaning Backer rod Installation Sealant installation
Cleaning Outlets
Edge drain outlet cleaning: Build up of leachate or silted over outlets can lead to water back up.
Checking Inlets
Is water flowing? Is there standing water? Are inlets free of debris? Check after a rainstorm…
Inspect the Ending
• Is water flowing • Is vegetation restricting proper flow • Check rodent screen • Does the lateral appear to be plugged
MDOT Maintenance Treatment Demonstrations
Shadows at joints showing higher saturation of fluid…Studies have shown the type of deicers we use have a great effect on joint durability and performance!
MDOT Field demonstration project on M-6 in Grand Rapids (2013) Resealing joints and applying 100% Silane penetrating sealer
For joints seeing more severe distress…. Fill the repair area with the hot-applied polymer modified material.
Good Performing Pavements require must start with… Good Design and Construction • Invest in the base and drainage. • Specify durable well graded (P1M) concrete mixes which have low permeability • Require supplemental materials (fly ash, slag cement) • Require contractor Quality Control • Test for the appropriate parameters, durability not just strength.
