Revised Predictive Model for Dynamic (Complex) Modulus of Asphalt Mixtures

Witczak, M W; Fonseca, O. A.

doi:10.3141/1540-03

Cited by 83 publications

(43 citation statements)

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“…Initial and specified mathematical models (regression equations) showed that bitumen temperature, viscosity and its effective content in the mixture, which depends on bitumen dosing errors, have an impact on HMA dynamic modulus E (Shen et al 2013;Witczak, Fonseca 1996). The increasing viscosity increases dynamic modulus E during a short period; however, during a long period, road pavement asphalt starts to scale due to larger viscosity.…”

Section: Modelling Variation Processes Of Bitumen Characteristics In mentioning

confidence: 99%

Investigation Into Technological Parameters of Bitumen Batching in an Asphalt Mixing Plant

Bražiūnas

2015

Journal of Civil Engineering and Management

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Abstract. An appropriate bitumen content and its properties in hot mix asphalt (HMA) mixture impact on the long-term mechanical strength of the laid asphalt pavement and the required road operation properties. During the production of a HMA mixture in an asphalt mixing plant (AMP), relationships between the structure and interaction of the mixture are established based on technological processes that specify bitumen batching and component mixing. These processes ensure the long-term strength, texture, evenness, the degree of damage and rheological properties of road pavement. The presented mathematical model enables us to determine the distribution of oxygen pressure by time in differently sized drops of bitumen during their fall into a mixer. The model considers oxygen diffusion, which depends on temperature, and heat conductivity, which depends on temperature, density and specific heat. An active experimental investigation under real production conditions demonstrated that the method of bitumen discharge from a batcher, temperature and time spent mixing materials with hot mineral aggregates impact on properties of bitumen binder within the produced HMA mixture. Parameters of technological processes for mixing of bitumen with mineral aggregates that occur in a bitumen batching system (BBS) are stochastic and impact on the composition of bitumen binder as well as physical and mechanical properties of the produced HMA mixture, namely, air void content, stability, flow and Marshall quotient.

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Section: Modelling Variation Processes Of Bitumen Characteristics In mentioning

confidence: 99%

Investigation Into Technological Parameters of Bitumen Batching in an Asphalt Mixing Plant

Bražiūnas

2015

Journal of Civil Engineering and Management

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“…Triaxial testing has been used by the road industry to characterize all types of road materials (Texas 1995;Witczak and Fonseca 1996;Kim et al 1997). However, there are drawbacks to the traditional geotechnical and Texas triaxial test apparati, such as limited test temperature testing capabilities, time consuming sample preparation and instrumentation, limited feedback control capabilities; limited dynamic testing capabilities, and difficult measurement of Poisson's ratio.…”

Section: Experimental Techniquesmentioning

confidence: 99%

Method for Performing Accelerated Characterization of Viscoelastic Constitutive Behavior of Asphaltic Concrete

Berthelot

Allen

Searcy

2003

J. Mater. Civ. Eng.

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“…Generally, the modulus is affected by the mixture characteristics, the rate of loading frequencies, and pavement temperature. It is also an important constituent in the mechanistic-empirical pavement design [6]. At early stages, the behaviour of FDR materials is similar to a granular material, but after the curing phase ends, the behaviour is close to a hot mix asphalt (HMA).…”

Section: Introductionmentioning

confidence: 99%

Rheological behavior of cold recycled asphalt materials with different contents of recycled asphalt pavements

Gandi

Carter

Singh

2017

Innov. Infrastruct. Solut.

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In Québec, for more than 20 years, cold in-place recycling (CIR) and full-depth reclamation (FDR) have been reliable rehabilitation techniques; restoring pavement condition at an affordable cost with a lower footprint on the environment. Experience reveals that CIR and FDR interventions effectively address the issues of reflective cracking and respect Québec's Ministry of transportation rutting threshold values. However, despite their commendable performance in the field, the cold recycled emulsified asphalt materials (CRM) has yet to be adequately characterized with respect to their rheological properties. This study was undertaken to evaluate the rheological behavior of the CRM with four different combinations of RAP (50, 75, 85, and 100%). The scope of work for this study consisted of preparing the laboratory compacted CRM specimens, determining the complex modulus (E*) of compacted specimens at various testing temperatures and loading frequencies, analyzing the experimental data with the help of 2S2P1D (2S: two springs, 2P: two parabolic elements, 1D: one dashpot) model and finally, validating the results with pavement design. It was concluded that 100% RAP mixture exhibits extremely high stiffness value at high frequency and low temperature. The results revealed that all four mixtures respect the time-temperature superposition principle with respect to the complex modulus. From a pavement design perspective, the moduli measured in this study do have a big impact. However, since different pavement structure are achieved with those different materials, the stiffest material, the CIR, ended up giving the least performant structure.

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Revised Predictive Model for Dynamic (Complex) Modulus of Asphalt Mixtures

Cited by 83 publications

References 0 publications

Investigation Into Technological Parameters of Bitumen Batching in an Asphalt Mixing Plant

Investigation Into Technological Parameters of Bitumen Batching in an Asphalt Mixing Plant

Method for Performing Accelerated Characterization of Viscoelastic Constitutive Behavior of Asphaltic Concrete

Rheological behavior of cold recycled asphalt materials with different contents of recycled asphalt pavements

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