01333321

Component

https://doi.org/10.3141/2208-14

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

A novel moisture-conditioning procedure consists mainly of heating an asphalt-coated substrate at 64°C inside an oven in a submerged condition. The proposed conditioning procedure can produce purely adhesive failure in most cases. On the basis of the adhesive failure achieved, a new mechanism on moisture damage has been proposed: under a submerged condition at pavement service temperatures, water develops randomly distributed, micro- and macroscale, cylindrical holes within a reasonable time period that penetrate up to the asphalt–substrate interface. Water then starts to replace the asphalt film from the substrate surface, and adhesive failure, or stripping, is observed. The first process is the dewetting of asphalt film from substrate, and the second process is the spread of moisture on substrate. With this moisture-conditioning procedure, it was observed that original PG 64-22, with 1% LOF 6500 (an amine-based, liquid antistrip additive) and with 1% LOF 6500, plus Sasobit, exhibited adhesive failure, whereas PG 64-22 plus Sasobit produced a mixed mode of failure. For PG 76-22M, only original samples (without additives) exhibited adhesive failure. The adhesive strengths of the moisture-conditioned samples were determined by a modified pull-off test with the use of a pneumatic adhesion tensile testing instrument. In this study, the free energy of adhesion and cohesion was also determined with the surface free energy (SFE) method. The results of the two methods did not necessarily correlate well, except that both methods (pull-off and SFE) indicated that the combination of 2% Sasobit and 1% LOF 6500 increased the moisture susceptibility.

01356747

11-4224

English

pp 108-117

2011

Transportation Research Record: Journal of the Transportation Research Board

9780309167390

Print

Photos; References (18) ; Tables (4)

Adhesion; Antistrip additives; Bituminous binders; Hot mix asphalt; Laboratory tests; Moisture damage; Samples; Stripping (Pavements); Warm mix paving mixtures

Pneumatic Adhesion Tensile Testing Instrument; Sasobit

Moisture conditioning; Pull off tests; Surface free energy

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

TRIS, TRB, ATRI

Feb 17 2011 6:47PM

• 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
• Influence of Production Temperature and Aggregate Moisture Content on the Initial Performance of Warm-Mix Asphalt
• Low-Temperature Fracture Characteristics of Selected Warm-Mix Asphalt Concretes
• 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