The Use of Hot Mix Asphalt for Colorado Trails and Paths Tom Clayton, SET Director of Training And Member Services.

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Presentation transcript:

The Use of Hot Mix Asphalt for Colorado Trails and Paths Tom Clayton, SET Director of Training And Member Services

The Use of Hot Mix Asphalt for Colorado Trails & Paths Overview  Technical Resource  Keys to Quality  Design/Construction  Maintenance  User Preference  Cost Comparisons Fraser Trail

The Use of Hot Mix Asphalt for Colorado Trails and Paths TECHNICAL RESOURCES: “A Guideline for the Design and Construction of Asphalt Pavements for Colorado Trails and Paths” 3 rd Edition, Fall 2005

The Use of Hot Mix Asphalt for Colorado Trails & Paths The Performance Challenge  Extend performance life  Reduce maintenance costs Fraser Trail

The Use of Hot Mix Asphalt for Colorado Trails & Paths The Performance Challenge Weed growth Shoulder failure Other issues: subgrade failure tree roots, raveling

The Use of Hot Mix Asphalt for Colorado Trails & Paths KEY TO PERFORMANCE “Proper design and construction together with the proper thickness and proper base preparation will help ensure a high quality hot mix asphalt trail or path.”

The Use of Hot Mix Asphalt for Colorado Trails & Paths Design/Construction “The performance of a paved trail depends on…… A) the material requirements specified B) the quality of construction of the contractor and…..”

The Use of Hot Mix Asphalt for Colorado Trails & Paths Design/Construction “The performance of a paved trail also depends on…… C) the structural design of the pavement and the D) investment level of the project Vail Pass Trail

The Use of Hot Mix Asphalt for Colorado Trails & Paths PERFORMANCE CHALLENGE “In the past, it was not uncommon for 2” asphalt trails to be constructed on compacted native soil.” CAUTION: The performance of a 2” asphalt trail constructed on native soil should not be compared directly with a 6” concrete pavement constructed on 6” of aggregate base.

The Use of Hot Mix Asphalt for Colorado Trails & Paths Design and Construction Tips Use the AASHTO design requirements for pavement and shoulders. (allow for drainage) “Rich” mixes provide excellent durability and allow for ease of construction and improved surface texture. Always use a weed sterilant!!

The Use of Hot Mix Asphalt for Colorado Trails & Paths Design and Construction Tips Asphalt pavement thickness minimum of 3” Aggregate base course thickness minimum of 6” Adequate subgrade preparation and requirements

The Use of Hot Mix Asphalt for Colorado Trails & Paths Design and Construction Tips Paving Seams (Construction Joints) Compaction Inspector’s Role Subgrade Preparation “The primary role of the inspector is to ensure that the plans and specifications are being followed.”

The Use of Hot Mix Asphalt for Colorado Trails & Paths Maintenance  inspection program  Preventive maintanance program Elbert County Trail

The Use of Hot Mix Asphalt for Colorado Trails & Paths User Preference - The Asphalt Advantage  continuous, joint free surface  soft, flexible pavement  ease of repair  lower construction cost

The Use of Hot Mix Asphalt for Colorado Trails & Paths

The Use of Hot Mix Asphalt for Colorado Trails and Paths Thank You!

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