Constitutive Modeling of Asphalt Bound Granular Materials: Theoretical Background

2002 ◽  
Author(s):  
J. Murali Krishnan ◽  
K. R. Rajagopal
Keyword(s):  
Creep Test ◽  
Asphalt Concrete ◽  
Constitutive Modeling ◽  
Hot Mix Asphalt ◽  
Constitutive Models ◽  
Companion Paper ◽  
Theoretical Background ◽  
Asphalt Mixtures ◽  
Unified Approach ◽  
Multiple Natural Configurations

Different kinds of hot mix asphalt mixtures are used in highway and runway constructions. Each of these mixtures cater to specific needs and differ from each other in the type and percentage of aggregates and asphalt used, and their response can be markedly different. Constitutive models used in the literature do not differentiate between these different kinds of mixtures and use models which treat them as if they are one and the same. In this study, we propose constitutive models for two different kinds of hot mix asphalt, viz., asphalt concrete and sand asphalt. We use a framework for materials that possess multiple natural configurations for deriving the constitutive equations. While asphalt concrete is modeled as a two constituent mixture, sand asphalt is modeled as a single constituent mixture due to the peculiarity in its makeup. In this study, we present a unified approach for deriving models for these different kind of mixtures. In a companion paper, we compare the predictions of the model for a compressive creep test with available experimental results.

Constitutive Modeling of Asphalt Bound Granular Materials: Applications to Sand Asphalt

2002 ◽  
Author(s):  
J. Murali Krishnan ◽  
K. R. Rajagopal
Keyword(s):  
Granular Materials ◽  
Asphalt Concrete ◽  
Constitutive Modeling ◽  
Hot Mix Asphalt ◽  
Constitutive Relations ◽  
Experimental Studies ◽  
Compressive Creep ◽  
Multiple Natural Configurations

In the earlier paper, we developed constitutive relations for two kinds of hot mix asphalt, viz., asphalt concrete and sand asphalt using the framework of materials with multiple natural configurations. In the present paper, we apply the framework that we developed for sand asphalt to study compressive creep experiments. Experimental studies of Wood and Goetz (1959) are used to compare with the predictions of the model.

Viscoelastic Properties of Field-Aged Cores

2013 ◽  
Vol 723 ◽  
pp. 551-556
Author(s):  
Ling Meng
Keyword(s):  
Asphalt Concrete ◽  
Viscoelastic Properties ◽  
Hot Mix Asphalt ◽  
Asphalt Mixture ◽  
Warm Mix Asphalt ◽  
Tension Test ◽  
Asphalt Mixtures ◽  
Direct Tension ◽  
Direct Tension Test ◽  
Aged Asphalt

Nowadays, engineers begin to pay more attention on field-aged asphalt concrete cores because they have more reality than the lab-made cores and the results can tell what happened to the pavement. However, it is not accurate to estimate the full asphalt mixture because as usual the pavement engineers can only extract the binder from it, not the mixture. Now there is a newly developed way to analysis the data more accurately using the Direct Tension Test. Because the field aged asphalt mixtures are not aged uniformly with the pavement depth because of various reasons, there is a modulus gradient going through deeply through the asphalt layer and usually the stiffest layer is the surface because normally the surface is more aged. A method has been developed to analysis this behavior. Tests are both taken on field cores which are Hot Mix Asphalt (HMA) and Warm Mix Asphalt (WMA). During the research, the authors found that it is both applicable for all the field cores. More information about this method and tests are detailed in the following paragraphs.

scholarly journals Application of Mining Waste Powder as filler in Hot Mix Asphalt

2019 ◽  
Vol 274 ◽  
pp. 04002 ◽  
Author(s):  
Sangiorgi Cesare ◽  
Tataranni Piergiorgio ◽  
Lantieri Claudio ◽  
Mazzotta Francesco
Keyword(s):  
Asphalt Concrete ◽  
Hot Mix Asphalt ◽  
Physical And Mechanical Properties ◽  
Extraction Process ◽  
Mining Waste ◽  
Asphalt Mixtures ◽  
Limestone Filler ◽  
Concrete Mixtures ◽  
Laboratory Characterization ◽  
Main Components

Asphalt concrete mixtures are composed of two main components: aggregates and binder. The fraction of aggregates passing through the 63μm sieve is traditionally considered as filler. During years, several researches have shown the importance and the influence of filler in controlling the physical and mechanical properties of Hot Mix Asphalts (HMAs). The main objective of this research is to investigate and to assess the effects given by the use of Mining Waste Powder (MWP) within HMAs in total substitution of traditional limestone filler. The MWP used in this study is a residual of the tungsten extraction process in Panasqueira (Portugal) mine. The evaluation of properties conferred by the presence of the MWP filler within asphalt mixtures is based on a physical and mechanical laboratory characterization. For this purpose, tests have been performed both on bituminous mastics and on HMAs. Results indicate that the use of MWP in total substitution of limestone filler does not negatively affect the performances of HMAs and their bituminous mastics.

Review of the uses and modeling of bitumen from ancient to modern times

2003 ◽  
Vol 56 (2) ◽  
pp. 149-214 ◽  
Author(s):  
J Murali Krishnan and ◽  
KR Rajagopal
Keyword(s):  
Asphalt Concrete ◽  
Chemical Structure ◽  
Mechanical Response ◽  
Constitutive Models ◽  
Review Article ◽  
Physical Characteristics ◽  
Modern Times ◽  
Classical Models ◽  
Multiple Natural Configurations ◽  
The Many

In this article, we provide a review of the uses of asphalt from ancient to modern times and we discuss the main attempts at mathematically modeling its behavior. We start with a discussion of the various definitions for asphalt and bitumen and discuss briefly some of the many fascinating uses to which they have been put from ancient to modern times. In Section 3 we survey the various attempts at unraveling the chemical structure of asphalt. The description of its physical characteristics, the early constitutive models that have been employed to describe its mechanical response, and the numerous tests to assess its properties are dealt with in Section 4. The next section is devoted to a discussion of the aging of asphalt. In Section 6, after a cursory discussion of the more classical models for asphalt concrete, we introduce the reader to a thermodynamic framework that has been recently put into place for bodies that have multiple natural configurations and use this framework to develop a model for describing the mechanical response of asphalt concrete. We use this model to describe various experiments that have been carried out on asphalt concrete and we find that the predictions of the model agree with experiments sufficiently well. This review article cites 580 references.

Constitutive modeling of coupled aging-viscoelastic response of asphalt concrete

2017 ◽  
Vol 131 ◽  
pp. 1-15 ◽  
Author(s):  
Eisa Rahmani ◽  
Masoud K. Darabi ◽  
Dallas N. Little ◽  
Eyad A. Masad
Keyword(s):  
Asphalt Concrete ◽  
Constitutive Modeling ◽  
Viscoelastic Response

scholarly journals Evaluations of Nano-Sized Hydrated Lime on the Moisture Susceptibility of Hot Mix Asphalt Mixtures

2012 ◽  
Vol 174-177 ◽  
pp. 82-90 ◽  
Author(s):  
Ju Nan Shen ◽  
Zhao Xing Xie ◽  
Fei Peng Xiao ◽  
Wen Zhong Fan
Keyword(s):  
Tensile Strength ◽  
Experimental Design ◽  
Hot Mix Asphalt ◽  
Hydrated Lime ◽  
Asphalt Mixtures ◽  
Indirect Tensile Strength ◽  
Moisture Resistance ◽  
Strength Ratio ◽  
Moisture Susceptibility ◽  
Indirect Tensile

The objective of this study was to evaluate the effect of nano-sized hydrated lime on the moisture susceptibility of the hot mix asphalt (HMA) mixtures in terms of three methodologies to introduce into the mixtures. The experimental design for this study included the utilizations of one binder source (PG 64-22), three aggregate sources and three different methods introducing the lime. A total of 12 types of HMA mixtures and 72 specimens were fabricated and tested in this study. The performed properties include indirect tensile strength (ITS), tensile strength ratio (TSR), flow, and toughness. The results indicated that the nano-sized lime exhibits better moisture resistance. Introducing process of the nano-sized lime will produce difference in moisture susceptibility.

Effects of asphalt concrete characteristics on cohesive zone model parameters of hot mix asphalt mixtures

2016 ◽  
Vol 43 (3) ◽  
pp. 226-232 ◽  
Author(s):  
S. Pirmohammad ◽  
H. Khoramishad ◽  
M.R. Ayatollahi
Keyword(s):  
Asphalt Concrete ◽  
Cohesive Energy ◽  
Cohesive Zone ◽  
Hot Mix Asphalt ◽  
Cohesive Zone Model ◽  
Experimental Tests ◽  
Model Parameters ◽  
Zone Model ◽  
Binder Type ◽  
Air Void

In this paper, the effects of the main asphalt concrete characteristics including the binder type and the air void percentage on the cohesive zone model (CZM) parameters were studied. Experimental tests were conducted on semi-circular bend (SCB) specimens made of asphalt concrete and the fracture behavior was simulated using a proper CZM. The CZM parameters of various hot mix asphalt (HMA) mixtures were determined using the SCB experimental results. Five types of HMA mixtures were tested and modeled to consider the effects of binder type and air void percentage on the CZM parameters. The results showed that as the binder in HMA mixture softened, the cohesive energy strength increased, whereas enhancing the air void percentage led to reduction of the cohesive energy and strength values. Among the studied HMA mixtures, the highest values of CZM parameters were found for the HMA mixture containing a copolymer called styrene-butadiene-styrene.

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