01020436

Component

https://doi.org/10.3141/1962-02

http://scholar.google.com...over&publication_year=2006

Aging of binders in pavements is much less understood than laboratory aging of neat binders because of a number of complications. Complications include suitable extraction and recovery methods; uncontrolled variables and unknowns such as mixture characteristics (e.g., air voids), maintenance treatments, traffic, and climate; sustaining of a research effort to study a given pavement during an appropriate time frame (in excess of one decade); and cost. An ongoing research effort sponsored by the Texas Department of Transportation studied binder oxidative hardening at 15 pavements across Texas. Results indicate that typically unmodified binders in pavements oxidize and harden to a degree that exceeds generally accepted pavement aging assumptions. In addition, this hardening may extend much deeper into the pavement than has been previously assumed or documented. Data suggest that pavements can oxidize at surprisingly uniform rates with depth once early oxidation occurs and that these rates continue for an extended time. As a rough measure, 1 month environmental room aging of 1-mm neat binder films at 60°C was equivalent to about 15 months in Texas Highway 21 after the early higher hardening rate period.

01036740

English

pp 12-20

2006

Transportation Research Record: Journal of the Transportation Research Board

0309099714

Print

Figures (5) ; References (25) ; Tables (1)

Aging (Materials); Asphalt pavements; Bituminous binders; Depth

Oxidative hardening

Texas

Highways; Materials; I31: Bituminous Binders and Materials

TRIS, TRB

Mar 3 2006 11:04AM

• Analysis of Premature Low-Temperature Cracking in Three Ontario, Canada, Pavements
• Characterization of Aggregate Resistance to Degradation in Stone Matrix Asphalt Mixtures
• Compact Tension Testing of Asphalt Binders at Low Temperatures
• Comparing Fine Aggregate Angularity with Aggregate and Hot-Mix Asphalt Performance Tests
• Controlling Performance of Crumb Rubber-Modified Binders Through Addition of Polymer Modifiers
• Determination of Lime in Hot-Mix Asphalt
• Evaluating Recycled Asphalt Pavement Mixtures with Mechanistic–Empirical Pavement Design Guide Level 3 Analysis
• High-Pressure Gel Permeation Chromatography of Aging of Recycled Crumb Rubber-Modified Binders With Rejuvenating Agents
• Low-Energy Asphalt with Performance of Hot-Mix Asphalt
• Low-Temperature Thermal Cracking of Asphalt Binder by Asphalt Binder Cracking Device
• Nonlinearity of Repeated Creep and Recovery Binder Test and Relationship with Mixture Permanent Deformation
• Recycling of Laboratory-Prepared Reclaimed Asphalt Pavement Mixtures Containing Crumb Rubber-Modified Binders in Hot-Mix Asphalt