Author: Adalberto Leandro Faxina
Publisher:
ISBN:
Category : Asphalt-rubber
Languages : en
Pages : 10
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The objective of this paper is to assess the effects of adding two modifiers of different chemical nature on the rheological behavior of asphalt-rubber binders: the shale-oil residue and the polyphosphoric acid. Four modified asphalt-rubbers were prepared: asphalt-rubber-PPA (18 % crumb rubber + 1 % PPA), asphalt-rubber-oil (18 % rubber + 10 % shale-oil residue), asphalt-rubber-oil-PPA-1 (18 % rubber + 10 % oil + 1 % PPA) and asphalt-rubber-oil-PPA-2 (9 % rubber + 5 % oil + 0.5 % PPA). A reference asphalt-rubber was prepared using 18 % crumb rubber. The samples were submitted to oscillatory-shear tests to obtain data (complex modulus, G*, and phase angle, ?) to construct master curves. Compared to the base asphalt binder, the pure asphalt-rubber improves the rutting and strain-controlled fatigue resistances. The addition of 1 % PPA enhances even more the rutting resistance and improves slightly the fatigue resistance below 20°C. The most substantial increase in fatigue resistance is obtained when 10 % oil is added to the pure asphalt-rubber, but its rutting resistance is drastically reduced. Mixtures 1 (18 % rubber + 10 % oil + 1 % PPA) and 2 (18 % rubber + 5 % oil + 0.5 % PPA) have lower rutting resistance compared to the base asphalt-rubber, but only mixture 1 has higher fatigue resistance. Compared to the base asphalt binder, all modified asphalt-rubber binders present higher G*/sin? values (at all rutting temperatures) and lower G*.sin? values (only below 20°C) when traffic speed reduces. Taking this evidence into account, the asphalt-rubber and the asphalt-rubber-PPA are the most appropriate. Although shale-oil residue has shown opposite results at intermediate and high pavement temperatures (enhancing the fatigue resistance and reducing the rutting resistance), it is able to reduce the viscosity of the asphalt-rubber, enhancing the workability of the HMA mixes during construction.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 22
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The objective of this study was to perform a preliminary evaluation of improving bonding and aging characteristics using a distillation residue from the Green River Formation (western) shale oil as a modifier to a petroleum asphalt for use as a crack and joint filler material in portland cement concrete and asphaltic pavements. This study was to examine the differences in moisture damage resistance and adhesion properties, as measured by bonding energy, of shale-oil modified asphalts compared with non-modified asphalts. The shale-oil modified asphalts mechanical properties were not expected to match those of the rubberized asphalt. A commercially available rubberized asphalt crack and joint filler material was also tested only for comparison of mechanical properties. Portland cement concrete briquets prepared with an asphalt material sandwiched between two concrete wafers were tested in a stress-relaxation type of experiment to evaluate the relaxation and recovery properties of the sealant materials. Energy of interaction (bonding energy) measurements were performed on asphalt materials with portland cement concrete, two silicate aggregates, and a limestone aggregate to evaluate the compatibility of the asphalt materials with various aggregates. The results show that the shale-oil modified petroleum asphalt improved the relaxation time, percent recovery, and bonding energy compared with the petroleum asphalt.
Author: Vikas Rameshchandra Sheth
Publisher:
ISBN:
Category :
Languages : en
Pages : 342
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Author: Andres Rangel
Publisher:
ISBN:
Category :
Languages : en
Pages : 314
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Author: Kenneth R. Wardlaw
Publisher: ASTM International
ISBN: 0803114133
Category : Asphalt
Languages : en
Pages : 368
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Book Description
"ASTM Publication Code Number (PCN) 04-011080-08. - "Sponsored by ASTM Committee D-4 on Road and Paving Materials."-- Foreword. - Includes bibliographical references and indexes. - Electronic reproduction; W. Conshohocken, Pa; ASTM International; 2011; Mode of access: World Wide Web; System requirements: Web browser; Access may be restricted to users at subscribing institutions.
Author: Ron Reese
Publisher:
ISBN:
Category : Asphalt-rubber
Languages : en
Pages : 76
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Book Description
The performance of projects incorporating asphalt-rubber binders has been inconsistent. Thus, a method was needed to provide an understanding of binder physical properties associated with the desirable performance and to quantify them for specification purposes. It was proposed to use the capabilities of a dynamic shear rheometer for comparing the asphalt-rubber binder properties with project performance data to determine the potential for rheological specifications on job samples of the binder. Representative binders from six dense-graded and gap-graded hot mix projects were analyzed.
Author: Huining Yin
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 12
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Author: S. Anjan kumar
Publisher:
ISBN:
Category : Aging
Languages : en
Pages : 12
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Book Description
This paper presents the results of investigations on the rheological properties of modified asphalt binders and their influence on the performance of asphalt mixes. Asphalt mixes with modified binders such as styrene butadiene styrene polymer, crumb rubber, natural rubber, and waste plastics were evaluated for their rheological properties and compared to the properties of asphalt mixes with unmodified VG30 (viscosity grade) asphalt binder. The dynamic modulus values and rutting characteristics of the asphalt mixes were studied with due consideration to different levels of aging and temperature variations. Studies on the rheological properties showed that the energy dissipated by unmodified asphalt (VG30) binder is higher than that of modified asphalt binders. Long-term aged natural rubber and waste plastic modified asphalt binders showed significant increase in the properties compared to unmodified asphalt binder (VG30). Reduced temperature susceptibility of polymer modified asphalt binder showed that only polymer modification can enhance both high temperature rutting resistance and low temperature thermal cracking resistance of asphalt mixes. The transient nature of polymer modified asphalt mix from viscoelastic solid-like to viscoelastic fluid-like condition is significantly shifted to higher temperature compared to that of the mix with unmodified asphalt binder. Aging and rutting indices showed that rubber modified asphalt mixes are highly susceptible to aging. Statistical analysis of test results showed that the process of modification of asphalt binder, aging, and temperature during the test influence the rheological and rutting characteristics of asphalt mixes significantly. Correlation between the asphalt binder properties and its influence on the rutting resistance are found to be statistically significant. The analysis using least significant difference showed that polymer modified asphalt binder significantly improves the aging and rutting resistance of asphalt mixes compared to unmodified asphalt binder.
Author: Qunshan Ye
Publisher:
ISBN:
Category : Asphalt
Languages : en
Pages : 12
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Recycling of waste plastic is an issue of great concern worldwide because of its considerable quantity and growth. The effects of waste polyethylene (PE) on the rheological properties of asphalt binder were investigated in this research. Three types of PE were adopted to prepare modified binders with contents ranging from 2 to 6 %. A viscosity test, performance grade test, frequency sweep test, amplitude sweep test, and linear amplitude sweep test are conducted to study rheological properties of PE modified binders, compared with base binder and binders modified with styrene-butadiene-styrene and crumb rubber modifier. The test results indicated that the high temperature properties of asphalt binders could be effectively improved by the PE modifiers with different types and contents. The high temperature grade and rutting resistance factor of PE modified binder can be increased significantly when compared with the base binder. With the increased PE content, the complex modulus increased, whereas the phase angle values decreased in most test frequencies and shear strain, which implied that the usage of PE not only reinforced the viscosity of binders but also enhanced the elasticity. The fatigue properties of PE modified binders were improved, especially at the lower shear strain range. However, PE modifier had a negative effect for asphalt binder on low temperature property.
Author: J. Kent Newman
Publisher:
ISBN:
Category :
Languages : en
Pages : 29
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