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Continued Implementation of high performance Thin Overlays in Texas Districts

Project Summary

Under research project 0-5598, guidelines and specifications were developed on how a District could design and construct long life overlays using the concept of the balance mix design. These new roadway surfaces must be designed to have a good combination of both rutting and cracking resistance. The process involves identifying District local sources of quality aggregates and developing both mixture type and performance test requirements to meet each District’s needs. Assistance is also required for specification and plan note development and for helping during construction to ensure a quality controlled new surface is being placed. Training materials were also developed in Study 0-5598 describing the best ways to select, design and construct these high performance overlays. The recommendations of the 0-5598 study have been well received by a number of Districts. In the most recently completed study, overlay sections were designed and constructed in the Lufkin, Bryan, Brownwood and San Antonio Districts.

Project Number

5-5598-05

Status

Completed

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Project Details

Start Date

2/19/2014

End Date

8/31/2016

Performing Institution(s)

Texas A & M Transportation Institute (TTI)

Research Team

RS: Tom Scullion

Sponsor

Project Manager

Joe Adams

Amount Funded

FY14: $20,000
FY15: $70,000
FY16: $12,000

Publications from this Project

Page:

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Functional Area

Construction and Maintenance

Index Terms

Air voids
Costs
Implementation
Overlays (Pavements)
Pavement performance
Thickness

Lead University

TTI

Researcher

Scullion, Thomas

Geographic name

Odessa, Tex.
Lufkin, Tex.
Texas

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Comments

kevyn

"In partnership with the Texas A&M Transportation Institute, TxDOT conducted extensive research on the design and construction of thin overlays in order to identify the right mix to improve pavement performance, specifically a reduction of rutting and cracking. During the course of this research, TxDOT found that a 1-inch thick overlay provided equitable end-result pavement life while completing maintenance and preservation activities at a reduced cost. Cost Savings: Due to the reduced amount of asphalt mix required, this adjusted strategy will realize $9 million in savings annually. These savings have been reinvested in expediting other roadway maintenance activities. This is a great example of how TxDOT is revisiting all aspects of the mission and looking for opportunities to improve efficiency and effectiveness across the department." -- http://www.txdot.gov/inside-txdot/office/excellence/cost-savings/thin-overlay.html

6/12/2015 at 2:23 PM

Helpful?

Record Added:

4/6/2015

Record Updated:

10/30/2023 11:50 AM EDT

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