01722467

Component

http://www.trb.org/Main/Blurbs/179718.aspx

In 2016, the Louisiana Department of Transportation and Development (LADOTD) implemented laboratory performance testing for the approval of asphalt mixture designs. The background, methodology, results, and discussion related to the research that led to the implementation of LADOTD balanced mixture design was discussed in detail in Transportation Research E-Circular E-C237: Application of Performance Tests During Asphalt Mixture Design. This paper presents the experience, observations, and results of LADOTD’s implementation of laboratory performance testing into the asphalt mixture design specifications. Mixtures were produced in accordance with newly implemented specifications to achieve a balance with respect to rutting and fatigue cracking. The following findings, observations, and conclusions may be drawn: 1) LADOTD has implemented performance testing for job mix formula approval into the 2016 specification for all travel lane mixtures; 2) implementation is most successful when agency and industry are informed and trained together with transparency; contractors in Louisiana have been producing materials under the new balanced specification with little to no issues; and 3) benefits of the implementation have been illustrated by increased effective asphalt binder content of the mixtures, increased innovation of material usage, increased RAP content, potential lower asphalt binder grade substitutions, and failure investigations.

01722465

English

pp 22-30

2019-9

Transportation Research Circular

Digital/other

Figures; References; Tables

Asphalt mixtures; Asphalt tests; Cracking; Laboratory tests; Mix design; Test procedures

Louisiana Department of Transportation and Development

Highways; Materials; Pavements

TRIS, TRB, ATRI

Nov 15 2019 10:22AM

• Development and Validation of the IDEAL Cracking Test
• Development of the Illinois Flexibility Index Test
• Evaluating Balanced Mixture Design for New Jersey to Enhance Asphalt Mixture Durability
• Relating DC(T) Fracture Energy to Field Cracking Observations and Recommended Specification Thresholds for Performance-Engineered Mix Design