HOW TO PAVE - NCAT

TOPIC: Introduction

Learning Outcomes

NCAT Mission
To provide innovative, relevant, and implementable research, technology development and education that advances safe, durable, and sustainable asphalt pavements.

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TOPIC: Surface Preparation

Learning Outcomes

  • Evaluate repair treatment selection.
  • Describe effect of surface preparation techniques on pavement performance.
  • Identify best practices for patching.
  • Name four reasons for performing milling.
  • Name three reasons for leveling.
  • Describe best practices for tack application.

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TOPIC: Mix Delivery and Segregation

Learning Outcomes

  • Describe delivery and unloading safety hazards
  • Describe specification requirements for haul trucks
  • Explain how to avoid mixture segregation
  • Describe how to detect thermal segregation
  • Describe the effect of segregation on pavement performance

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TOPIC: Asphalt Mix Placement

Learning Outcomes

  • Name key components of an asphalt paver and the function of  each.
  • Identify results of improper paver operation and determine appropriate corrective  action.
  • Determine spread rate.

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TOPIC: Compaction

Learning Outcomes

  • Understand the purpose of compaction
  • Relate mix type, density, and air voids to permeability and performance
  • Match types of compaction equipment with their  functions
  • Evaluate the effect of various factors on the ability  to achieve density
  • Determine time available for compaction
  • Identify new technologies for compaction  operations

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TOPIC: Joint Construction

Learning Outcomes

  • Identify best practices for creating a transverse joint.
  • Differentiate among types of longitudinal joints.
  • Identify best practices for longitudinal joint  construction.
  • Identify consequences of poor joint density.

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TOPIC: Summary and Review

Learning Outcomes

  • Review course materials by answering topic-related  questions
  • Relate mat defects to probable causes and determine potential corrective action

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Recycling

SuperPave

TOPIC: Recycling

Content

  • Project Evaluation
  • Partial Depth Cold In Place Recycling
  • Cold Central Plant Recycling
  • Full Depth Recycling
  • Hot In Place Recycling
  • Mixture Design

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TOPIC: SuperPave

Superpave Overview

The final product of the SHRP asphalt program area is Superpave. Superpave
is an acronym which stands for: Superior Performing Asphalt Pavements

Major Steps in Superpave

  • Selection of Materials
  • Selection of a Design Aggregate Structure
  • Selection of the Design Binder Content
  • Evaluation of Moisture Sensitivity of the Design Mixture

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Using Rap

TOPIC: Asphalt Quality

Rap Issues

  • Grade dumping and bumping
  • Characterization of RAP binders
  • Blending charts
  • Effect of RAP on binder properties
  • Effect of RAP on mix properties
  • Modified asphalt in a RAP world

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TOPIC: Using RAP in Asphalt Mixtures

Learning Outcomes

“The use of recycled materials, particularly reclaimed asphalt pavement (RAP) and reclaimed asphalt shingles (RAS), conserve raw materials and reduce overall asphalt mixture costs….”

  • Survey Scope
    • Asphalt mix producers from all 50 states represented
    • 228 companies/branches with 1,185 plants represented

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Thin Asphalt Overlays

TOPIC: Thin Asphalt Overlays

Why?

  • Shift from new construction to renewal and preservation
  • Material Improvements
  • Functional improvements for safety and smoothness are needed more than structural improvements – Perpetual Pavements

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