01336745

Component

https://doi.org/10.3141/2208-13

http://scholar.google.com...uber&publication_year=2011

The concept and use of warm-mix asphalt (WMA) is becoming more popular in the asphalt industry. The promise of reduced energy consumption, reduced emissions, and a more workable product is appealing to an industry pressured by environmentalists with sustainability agendas and state agencies that apply pay adjustments on the bases of ride quality and pavement density. The use of WMA may come with some potential issues, however. Lower production temperatures may result in softer asphalt because of reduced oxidative aging, while poorly dried aggregates may create a problem from moisture damage. To evaluate these issues, a research project was undertaken to quantify the influence of mixing (production) temperature on the rutting and fatigue cracking performance of WMA mixtures. Stripping potential was also evaluated by using prewetted aggregate blends and by modifying the mixing procedure in the laboratory to more appropriately simulate a drum plant production of WMA. The laboratory procedure clearly indicated a decrease in rutting resistance and stiffness when evaluated in an asphalt mixture performance tester and dry Hamburg wheel tracking (HWT) tests once mixing temperatures decreased. Fatigue cracking resistance meanwhile increased in an overlay tester. Tensile strength ratio (TSR) and wet HWT tests indicated that TSR and Hamburg rutting values were able to obtain only passing results at conventional hot-mix asphalt mixing temperatures and with dry aggregates. The information presented may help state agencies to develop quality control testing plans for future implementation of WMA.

01356747

11-4037

English

0000-0001-9083-9317

pp 97-107

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167390

Print

Figures (7) ; References (13) ; Tables (4)

Aggregates; Asphalt mixtures; Fatigue cracking; Laboratory tests; Moisture content; Quality control; Rutting; Stiffness; Stripping (Pavements); Temperature; Tensile strength; Warm mix paving mixtures

Asphalt Mixture Performance Tester; Hamburg Wheel Tracking Device

Highways; Materials; Pavements; I23: Properties of Road Surfaces; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Feb 17 2011 6:44PM

• Effect of Mineral Filler Characteristics on Asphalt Mastic and Mixture Rutting Potential
• Effects of Recycled Asphalt Pavement Amounts on Low-Temperature Cracking Performance of Asphalt Mixtures Using Acoustic Emissions
• Estimating the Effect of Recycled Asphalt Pavements and Asphalt Shingles on Fresh Binder, Low-Temperature Properties Without Extraction and Recovery
• Fatigue Evaluation of Warm-Mix Asphalt Mixtures: Use of Uniaxial, Cyclic, Direct Tension Compression Test
• Full-Scale Structural Evaluation of Fatigue Characteristics in High Reclaimed Asphalt Pavement and Warm-Mix Asphalt
• Hot-Mix Asphalt That Contains Nickel Slag Aggregate: Laboratory Evaluation of Use in Highway Construction
• Low-Temperature Fracture Characteristics of Selected Warm-Mix Asphalt Concretes
• Novel Moisture-Conditioning Method for Adhesive Failure of Hot- and Warm-Mix Asphalt Binders
• Performance Characteristics of Thin-Lift Overlay Mixtures: High Reclaimed Asphalt Pavement Content, Recycled Asphalt Shingles, and Warm-Mix Asphalt Technology
• Performance Evaluation of Asphalt Mixtures with High Recycled Asphalt Pavement Content
• Practical Method to Understand the Effect of Aggregate Drying on the Moisture Content of Hot-Mix Asphalt
• Rutting Resistance of Asphalt Concrete Mixtures That Contain Recycled Asphalt Pavement
• Use of Data from Specific Pavement Studies Experiment 5 in the Long-Term Pavement Performance Program to Compare Virgin and Recycled Asphalt Pavements