Influence of Moisture on Bond Strength of Asphalt-aggregate Systems PDF Download
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Author: Audrey R. Copeland
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 0
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Book Description
Moisture is a major source of degradation of hot mix asphalt (HMA) used in highway pavements. Moisture damage occurs when there is a loss of bond either at the asphalt-aggregate interface or within the asphalt mastic. The presence of moisture may strip asphalt binder from the aggregate (adhesive failure) and/or weaken the asphalt mastic (cohesive failure) resulting in pavement cracking and deformation. Bond strength is determined via a direct tensile test utilizing the Pneumatic Adhesion Tensile Testing Instrument (PATTI). The usefulness of the direct tensile test is determined for asphalt binders and mastics and the influence of moisture on tensile strength of asphalt binders and mastics and between asphalt and aggregate pairs is evaluated. The results of the experiments verify that moisture degrades the bond strength of asphalt binders, mastics, and between asphalt and aggregate. Results from the direct tensile test experiments are then linked to moisture diffusion simulations and bond strength degradation as a function of the amount of moisture at the asphalt-aggregate interface is established. Based on this relationship, the amount of damage that occurs over time in regards to the amount of moisture at the interface is quantified. Finally, limit-state based reliability analysis concepts are introduced to formulate a performance criterion for moisture-induced damage of asphalt-aggregate systems. The moisture-induced damage parameter is an integral part of a larger framework developed for predicting moisture-induced damage in asphalt mixtures.
Author: Audrey R. Copeland
Publisher:
ISBN:
Category : Aggregates (Building materials)
Languages : en
Pages : 0
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Book Description
Moisture is a major source of degradation of hot mix asphalt (HMA) used in highway pavements. Moisture damage occurs when there is a loss of bond either at the asphalt-aggregate interface or within the asphalt mastic. The presence of moisture may strip asphalt binder from the aggregate (adhesive failure) and/or weaken the asphalt mastic (cohesive failure) resulting in pavement cracking and deformation. Bond strength is determined via a direct tensile test utilizing the Pneumatic Adhesion Tensile Testing Instrument (PATTI). The usefulness of the direct tensile test is determined for asphalt binders and mastics and the influence of moisture on tensile strength of asphalt binders and mastics and between asphalt and aggregate pairs is evaluated. The results of the experiments verify that moisture degrades the bond strength of asphalt binders, mastics, and between asphalt and aggregate. Results from the direct tensile test experiments are then linked to moisture diffusion simulations and bond strength degradation as a function of the amount of moisture at the asphalt-aggregate interface is established. Based on this relationship, the amount of damage that occurs over time in regards to the amount of moisture at the interface is quantified. Finally, limit-state based reliability analysis concepts are introduced to formulate a performance criterion for moisture-induced damage of asphalt-aggregate systems. The moisture-induced damage parameter is an integral part of a larger framework developed for predicting moisture-induced damage in asphalt mixtures.
Author:
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 144
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Author: A. R. Tarrer
Publisher:
ISBN:
Category : Aggregates (Building materials).
Languages : en
Pages : 36
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Author: Silvia Caro Spinel
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
The deleterious effect of moisture on the structural integrity of asphalt mixtures has been recognized as one of the main causes of early deterioration of asphalt pavements. This phenomenon, usually referred to as moisture damage, is defined as the progressive loss of structural integrity of the mixture that is primarily caused by the presence of moisture in liquid or vapor state. Moisture damage is associated with the development of different physical, mechanical, and chemical processes occurring within the microstructure of the mixture at different intensities and rates. Although there have been important advancements in identifying and characterizing this phenomenon, there is still a lack of understanding of the damage mechanisms occurring at the microscopic level. This situation has motivated the research work reported in this dissertation. The main objective of this dissertation is to formulate and apply a numerical micromechanical model of moisture-induced damage in asphalt mixtures. The model focuses on coupling the effects of moisture diffusion-one of the three main modes of moisture transport within asphalt mixtures-with the mechanical performance of the microstructure. Specifically, the model aims to account for the effect of moisture diffusion on the degradation of the viscoelastic bulk matrix of the mixture (i.e., cohesive degradation) and on the gradual deterioration of the adhesive bonds between the aggregates and the asphalt matrix (i.e., adhesive degradation). The micromechanical model was applied to study the role of some physical and mechanical properties of the constitutive phases of the mixtures on the susceptibility of the mixture to moisture damage. The results from this analysis suggest that the diffusion coefficients of the asphalt matrix and aggregates, as well as the bond strength of the aggregate-matrix interface, have the most influence on the moisture susceptibility of the mixtures. The micromechanical model was further used to investigate the influence of the void phase of asphalt mixtures on the generation of moisture-related deterioration processes. Two different probabilistic-based approaches were used to accomplish this objective. In the first approach, a volumetric distribution of air void sizes measured using X-Ray Computed Tomography in a dense-graded asphalt mixture was used to generate probable void structures in a microstructure of an asphalt mixture. In the second approach, a stochastic modeling technique based on random field theory was used to generate probable air void distributions of the mixture. In this second approach, the influence of the air void was accounted for by taking the physical and mechanical properties of the asphalt matrix dependent on probable void distributions. Although both approaches take into consideration the characteristics of the air void phase on the mechanical response of the mixtures subjected to moist environments, the former explicitly introduces the air phase within the microstructure while the latter indirectly includes its effects by modifying the material properties of the bulk matrix. The results from these simulations demonstrated that the amount, variability and location of air voids are decisive in determining the moisture-dependent performance of asphalt mixtures. The results from this dissertation provide new information on the kinetics of moisture damage mechanisms in asphalt mixtures. In particular, the results obtained from applying the micromechanical model permitted identification of the relative influence of the characteristics of the constitutive phases of a mixture on its moisture-related mechanical performance. This information can be used as part of design methodologies of asphalt mixtures, and/or as an input in life-cycle analysis models and maintenance programs of road infrastructure.
Author: Russell G. Hicks
Publisher: Transportation Research Board
ISBN: 9780309049245
Category : Technology & Engineering
Languages : en
Pages : 104
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Book Description
This synthesis will be of interest to pavement designers, construction engineers, maintenance engineers, and others interested in avoiding or limiting moisture damage in asphalt concrete. Information is provided on physical and chemical explanations for moisture damage in asphalt concrete, along with a discussion of current practices and test methods for determining or reducing the susceptibility of various asphalt concrete components and mixtures to such damage. Moisture damage in asphalt concrete is a nationwide problem which often necessitates premature replacement of highway pavement surfaces. This report of the Transportation Research Board describes the underlying physical and chemical phenomena responsible for such damage. Current test methods used to determine the susceptibility of asphalt concretes, or their constituents, to moisture damage are described and evaluated. Additionally, current practices for minimizing the potential for moisture damage are examined.
Author: Ching Yern Chee
Publisher: Springer Nature
ISBN: 9819740800
Category : Composite materials
Languages : en
Pages : 330
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Book Description
Zusammenfassung: This book includes selected peer reviewed articles presented at the 7th International Conference on Materials Engineering and Nanotechnology 2023 (ICMEN 2023) held on 04-05Nov at Kuala Lumpur in Malaysia. It highlights recent innovative approach and developments in materials engineering and nanotechnology fields. A broad range of topics and issues in modern materials science and nanotechnology are discussed, including advanced materials synthesis and characterization, nanoscale science and engineering, functional composite and nanomaterials, sustainable materials and green technologies. The importance and relevance of these proceedings lie in their contribution to the scientific community's collective knowledge and understanding of materials science/engineering and nanotechnology. By disseminating cutting-edge research findings and innovations, these proceedings foster collaboration, inspire new ideas, and push the boundaries of scientific discovery. Given its scope, this book will be of interest to a wide readership, including materials and nanotechnology engineers, scholars and researchers in science, technology and engineering disciplines
Author: Akhtarhusein Asgarali Tayebali
Publisher:
ISBN:
Category : Asphalt concrete
Languages : en
Pages : 96
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Author:
Publisher:
ISBN:
Category : Pavements, Asphalt
Languages : en
Pages : 192
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Author: Andrew Hanz
Publisher:
ISBN:
Category : Adhesion
Languages : en
Pages : 216
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 192
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