Webinar Series

Expected Outcomes

• Learn history and rationale behind AASHTO M 320 and AASHTO M 332.
• Learn differences, nomenclature differences, and improvements between AASHTO specifications.
• Consider possible implementation barriers and implementation steps.

Expected Outcomes

• Gain knowledge on pneumatic tire composition and get an overview of the waste tire issue and common recycle or reuse opportunities to include asphalt modification.
• Gain knowledge on the historical use of GTR in asphalt paving applications.
• Learn the different processing technologies used to modify asphalt binders and asphalt mixtures with GTR.
• Learn potentials for specification and testing of GTR modified asphalt binders and mixtures.
• Learn potential issues with use of GTR in modified asphalt binders and mixtures.

Expected Outcomes

• Learn to identify potential quality assurance engineering and acceptance risks.
• Gain knowledge in identifying techniques to mitigate quality assurance risks.
• Understand the principles based on a State DOT example.

Expected Outcomes

• Understanding of the impact of in-place density on asphalt pavement performance and life cycle cost.
• Awareness of density demonstration projects conducted across the U.S. to identify techniques and tools for improving density.
• Awareness of example State DOT in-place density specifications.
• Understanding of how average density and variability of density impact percent within limits (PWL).
• Awareness of changes related to density that State DOTs made to specifications and acceptance plans based on observations from demonstration projects.

Expected Outcomes

• Recognizing that obstacles to achieving in-place mat density can occur.
• Awareness of potential obstacles to achieving in-place mat density associated with materials, pavement structure and construction operations.
• Recognition of practices for planning, design and mixture selection for improved joint performance.
• Identification of positive longitudinal joint construction practices and specifying and testing joint density.

Expected outcomes:

• Familiarity with techniques employed by State DOTs for using high RAP in asphalt mixtures.
• An understanding of the benefits State DOTs have observed with the high RAP use.
• Exposure to the criteria State DOTs use when allowing high RAP mixtures. 
• Exposure to methods State DOTs use to get additional virgin asphalt binder in mixtures with high RAP contents. 
• Awareness of what participating State DOTs identified as important implementation considerations for high RAP use.

Expected Outcomes

• Familiarity with techniques employed by state DOTs for using RAS in asphalt mixtures. 
• An understanding criteria state DOTs use when allowing RAS mixtures.
• Exposure to methods state DOTs use to get additional virgin asphalt binder in mixtures with RAS contents.
• Awareness of what participating state DOTs identified as important implementation considerations for RAS use. 

Expected Outcomes

• Gain limited perspective of how GTR is used to modify asphalt binders.
• Gain overview knowledge of the primary types of GTR modified asphalt binders used in asphalt mixtures.
• Receive a historical perspective of use of GTR modified asphalt binders used in asphalt mixtures.
• Practical knowledge/considerations in mix design of asphalt mixtures containing GTR modified asphalt binders.
• Balanced mix design (BMD) considerations for mixtures containing GTR modified asphalt binders.

Expected Outcomes

• List some of the advances made in the design and construction of SMA mixtures and their impact on performance and cost.
• Explain and demonstrate use of the Balanced Mix Design process and tests applied to SMA mixtures.
• Discuss use and application of SMA mixtures simulated in mechanistic-empirical pavement design procedures.

Expected Outcomes

• Understanding the role of ΔTc as an indicator of the effect of aging and additives on the asphalt rheology
• Awareness for responsible deployment of the ΔTc as a specification parameter
• Learning about possible implementation barriers and implementation steps

Related publication: Tech brief: Delta tc binder specification parameter

Webinar link: DAPT Webinar on Delta Tc (ΔTc Binder Specification Parameter

Expected Outcomes

• Understand the why and overall benefits of BMD.
• Recognize the overall planning and coordination effort associated with the implementation process of BMD.
• Identify the tasks that need to be completed for the development and implementation of BMD.
• Recognize successful key state DOTs practices and experiences related to BMD.
• Recognize available external technical information and support.

Related publication: Tech brief: Balanced Asphalt Mix Design: Eight Tasks for Implementation

Related publication: Positive Practices, Lessons Learned and Challenges When Implementing Balanced Design of Asphalt Mixes: Site Visits

Expected Outcomes

• Understanding how mixture composition affects mix performance as measured by a variety of laboratory tests.
• Learn how binder properties, including PG grade and polymer modification, enhance mixture rut resistance and fatigue and fracture performance.
• Predict how increases in binder content will affect rut resistance and fatigue life as measured in laboratory tests.
• How to adjust binder gradation and air void content to reduce mixture permeability.
• Understanding potential limitations of some laboratory fracture tests.

Related Publication: A Manual for Design of Hot-Mix Asphalt with Commentary (2011)

Related Publication: Modification of the Resistivity-Rutting Model to Use Recoverable Creep Compliance

Webinar Registration Link: https://unr.zoom.us/meeting/register/tZYlfumuqj8vGd0Sqh98ZEEQ3PEPubhftmMs