01155687

Component

https://doi.org/10.3141/2181-11

http://scholar.google.com...tlar&publication_year=2010

Hot-mix asphalt (HMA) is a particulate composite of mineral aggregates and asphalt binder in which the aggregate particles reinforce the soft asphalt binder phase, as evidenced by the several orders of magnitude of difference in the stiffness of HMA compared with the binder. To develop a mechanistic way of predicting the stiffness of HMAs, an experimentally constructed database of the stiffness evolution, as the volume concentration of the aggregate particles progressively increases (from asphalt binder to coarse HMA mixture), is essential. In this study, a unique database of the complex modulus (E*) was collected with a hollow cylinder tensile test device; asphalt–aggregate mixtures with varying volume concentrations of aggregate particles were tested over a range of temperatures and loading frequencies. The complex modulus master curve data for these mixtures were then compared with micromechanical model predictions, on the basis of a differential scheme effective medium theory that is known to capture accurately the reinforcing effect of stiff particles placed in a soft matrix. Stiffening mechanisms, such as volume replacement and aggregate interlock, were explored in light of this new data set and the model predictions. The volume replacement stiffening mechanism was quite pronounced; a considerable amount of aggregate interlock effect was also observed at certain aggregate volume concentrations and testing frequencies and temperatures. A detailed analysis of the data that sheds light on stiffening mechanisms in asphalt concrete mixtures is provided.

01328240

10-3689

English

pp 98-108

2010

Transportation Research Record: Journal of the Transportation Research Board

9780309160551

Print

Figures (8) ; Photos (5) ; References (30) ; Tables (2)

Aggregates; Asphalt mixtures; Bituminous binders; Hot mix asphalt; Interlocking aggregates; Mathematical models; Mathematical prediction; Stiffness

Complex modulus; Micromechanics models

Highways; Materials; Pavements; I31: Bituminous Binders and Materials

TRIS, TRB, ATRI

Jan 25 2010 11:52AM

• Characterization of Permanent Deformation of Asphalt Mixtures Based on Shear Properties
• Development of a Flow Number Predictive Model
• Development of Artificial Neural Network Predictive Models for Populating Dynamic Moduli of Long-Term Pavement Performance Sections
• Effect of Thermal Stresses on Pavement Performance Under Mild Climate Conditions
• Estimate of Fatigue Shift Factors Between Laboratory Tests and Field Performance
• Estimation of Stress Conditions for the Flow Number Simple Performance Test
• Fénix Test: Development of a New Test Procedure for Evaluating Cracking Resistance in Bituminous Mixtures
• Fatigue Crack Propagation Model of Asphalt Concrete Based on Viscoelastic Fracture Mechanics
• Multiscale Modeling to Predict Mechanical Behavior of Asphalt Mixtures
• Rutting Resistance of Laboratory-Prepared and Field-Compacted Asphalt Mixtures
• Semiempirical, Analytical, and Computational Predictions of Dynamic Modulus of Asphalt Concrete Mixtures
• Use of Nonuniform Stress-State Tests to Determine Fracture Energy of Asphalt Mixtures Accurately