Asphalt Cement Chemical Characterization and Performance Related Properties PDF Download
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Author:
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 22
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Author:
Publisher:
ISBN:
Category : Pavements, Asphalt concrete
Languages : en
Pages : 22
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Author: Guillermo Thenoux
Publisher:
ISBN:
Category : Asphalt cement
Languages : en
Pages : 394
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Book Description
This dissertation presents the findings of a literature review and information regarding selection, implementation and development of a chemical composition procedure for asphalt cements. The chemical composition analysis selected was the Corbett-Swarbrick procedure standarized as ASTM D4124. The procedure is a selective adsorption / desorption (solid / liquid) chromatography which separates asphalts in four distinct generic fractions. During the implementation of the Corbett-Swarbrick method, a number of refinements were made to improve its efficiency. These are presented in a comprehensive user manual as an appendix of this dissertation. The chemical procedure selected in conjunction with other rheological measurements of asphalt was used in a comprehensive study to characterize asphalt pavement material properties. Eight highway projects located throughout the State of Oregon were included in the present research. The highway projects were chosen to represent a wide variety of environmental and traffic conditions. Asphalt fractional composition was statistically related to asphalt theological properties and asphalt temperature susceptibility. Asphalt material properties were also included in the selection of prediction models and related to pavement performance. Fractional composition was also used for the evaluation of four different asphalt extraction / recovery procedures and the evaluation of a pressure oxygen bomb device, used for asphalt laboratory aging. The major findings of the research were: Fractional compositional analysis of asphalt showed that recovered asphalt may not represent the same characteristics of the actual asphalt present in the mix. Some rheological properties of asphalt showed good correlation to asphalt composition in the higher temperature range. At lower temperature, however, relationships were more scattered. Different temperature susceptibility parameters have different relationships with chemical fractional composition, and, do not correlate with each other. Different extraction / recovery procedures yield different chemical fractional composition for the same asphalt. Pavement performance statistically relates to groups of asphalt properties and asphalt mix properties.
Author:
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 220
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Author: Peterson
Publisher: Strategic Highway Research Program (Shrp)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 176
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Book Description
This final report, in four volumes, of Strategic Highway Research Program (SHRP) Project A-002A describes intensive investigations of the chemical and physical properties of petroleum asphalts used in the construction of highway pavements. The model and predictive capability constitute the major portion of volume 1.
Author: William Howard Daly
Publisher:
ISBN:
Category : TECHNOLOGY & ENGINEERING
Languages : en
Pages : 107
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In this project the researchers studied a correlation between molecular structure and corresponding compositional analysis of asphalt binders of conventional hot mix asphalt mixtures (HMA) as well as mixtures containing reclaimed asphalt pavement (RAP) and/or recycled asphalt shingles (RAS) with their cracking potential at intermediate temperature. The molecular size and structure of asphalt components of RAP and RAS undergo large changes during their exposure to environmental factors, which affects the physical properties imparted to their mixtures with conventional asphalt liquids. The composition of the mixtures prepared using a PG 70-22M binder was ascertained using thin layer chromatograpy/FID detection (Iatroscan), gel permeation chromatography (GPC) and Fourier transform infrared spectroscopy (FTIR). The distribution of species by molecular mass as determined by deconvoluting gel permeation chromatographs, emphasizing in particular, the amount of asphaltenes as they are related to the age hardening of asphalt materials. The extent of sample aging is apparent from the carbonyl oxygen content from FTIR measurements of the mixtures. Fracture resistance of laboratory produced mixtures was assessed using the Semi Circular Bend Test (SCB) test procedure; a minimal value of 0.5 kJ/m2 was considered acceptable. Mixtures containing up to 5% RAS, 15% RAP and 15% RAP/5% RAS met the SCB standard. Molecular fractionation through GPC of mixtures containing RAS confirmed the presence of highly associated asphaltenes in greater concentrations than mixtures containing recycled asphalt pavement (RAP). High concentrations of high molecular weight associated asphaltenes (mol wt > 20K Daltons) which are present in RAS samples decrease the fracture resistance of the asphalt mixtures. The use of recycling agents, Cyclogen-L, Hydrogreen, Asphalt Flux and Re-refined engine oil bottoms (REOB), did not reduce the concentration of the highly associated asphaltenes, further they failed to improve the cracking resistance of the asphalt mixtures evaluated in this study. However, the recycling agents effected quantitative extraction of the RAS asphalt component.
Author: KM. Chua
Publisher:
ISBN:
Category : Asphalt emulsion mixtures
Languages : en
Pages : 18
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Book Description
It is often desirable to be able to obtain a comprehensive characterization of the performance-related properties of asphalt concrete with as few tests as possible. The New Mexico State Highway and Transportation Department is interested in obtaining a comprehensive characterization of the performance-related properties of the four types of asphalt concrete mixtures that are commonly used in the state. These properties include: the strength, the resilient modulus, the rutting characteristics, and the fatigue/cracking characteristics. Typically, different tests are needed to determine these characteristics. However, the approach taken here to obtain the desired information is through dynamic testing with large (15 cm diameter x 30 cm high) cylindrical asphalt concrete specimens at four different load levels, frequencies, and temperatures. The load applied were 1112 N, 2224 N, 4448 N, and 8896 N; at frequencies of 1 Hz, 4 Hz, 8 Hz, and 16 Hz. Test temperatures were 4.4°C, 25°C, 37.8°C, and 60°C. Continuous haversine load cycles were applied for each test set and the response to the repeated loadings were recorded. Resilient modulus histories were obtained. Rutting characteristics of the material at different temperatures were obtained from the residual deformation histories. The thermal viscoelastic properties were determined from the deformation response at the different temperatures. The change in the damping characteristics with repeated loading were determined through analysis of the data in the frequency domain. Since damping properties can be related to the embrittlement and aging characteristics of materials, the fatigue properties were also inferred. Additionally, it is shown that the degree of susceptibility of the asphalt concrete to cracking and reflection cracking can also be estimated.
Author: David A. Anderson
Publisher: Strategic Highway Research Program (Shrp)
ISBN:
Category : Technology & Engineering
Languages : en
Pages : 504
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Author:
Publisher:
ISBN: 9780309058063
Category : Binders (Materials)
Languages : en
Pages : 193
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Book Description
This volume describes the development of test methods for the characterization of asphalt cement. These test methods may be used in specifications and for developing correlations between physical and chemical properties. To understand how the properties of asphalt cement and asphalt concrete mixtures relate to one another, fundamental material properties expressed in engineering units were required. This information was used to develop models that relate the properties of asphalt cement to mixture properties and, in turn, to pavement performance. A method for the extraction and recovery of asphalt binder from asphalt mixes is also included.
Author: Kun Zhang
Publisher: Springer
ISBN: 3319957899
Category : Science
Languages : en
Pages : 179
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Book Description
This book presents new studies dealing with the attempts made by the scientists and practitioners to address contemporary issues in pavement engineering such as aging and modification of asphalt binders, performance evaluation of warm mix asphalt, and mechanical-based pavement structure analysis, etc.. Asphalt binder and mixture have been widely used to construct flexible pavements. Mechanical and Chemical characterizations of asphalt materials and integration of these properties into pavement structures and distresses analysis are of great importance to design a sustainable flexible pavement. This book includes discusses and new results dealing with these issues. Papers were selected from the 5th GeoChina International Conference 2018 – Civil Infrastructures Confronting Severe Weathers and Climate Changes: From Failure to Sustainability, held on July 23 to 25, 2018 in HangZhou, China.
Author: Jack S. Youtcheff
Publisher:
ISBN:
Category : Binders (Materials)
Languages : en
Pages : 70
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