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A Drescher - One of the best experts on this subject based on the ideXlab platform.
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influence of roofing shingles on Asphalt Concrete Mixture properties final report
1993Co-Authors: D E Newcomb, Mary Stroupgardiner, B Weikle, A DrescherAbstract:It is estimated that the production of new roofing shingles generates approximately 1,000,000 tons of waste annually in the U.S., and about 36,000 tons of this waste is in the Twin Cities Metro Area of Minnesota. With another 8.5 million tons of waste materials from the rebuilding of shingle or hot-mop roofs each year on a national scale, it seems viable that their use in hot-mix would be an attractive alternative to disposing of them in landfills. This report presents the results of an effort to evaluate the use of roofing waste generated by manufacturers and from reconstruction projects. It was shown that up to 5%, by weight of Mixture, manufacturing waste roofing shingles could be used in Asphalt Concrete with a minimum impact on the properties of the Mixture. At a level of 7.5%, a noticeable softening of the Mixture occurs, and this might be detrimental to pavement performance. The use of shingles from roof reconstruction projects resulted in the embrittlement of the Mixture which may be undesirable for low temperature cracking of pavements. The manufactured shingle waste seems to work well in stone mastic Asphalt Mixtures.
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Influence of roofing shingles on Asphalt Concrete Mixture properties. Final report, 1992-1993
1993Co-Authors: D E Newcomb, B Weikle, M. Stroup-gardiner, A DrescherAbstract:The objective of the study was to evaluate the use of waste shingles from manufacturing and roof reconstruction projects in hot mix Asphalt Concrete Mixtures. In dense-graded Asphalt Mixtures, it was hypothesized that the waste material might serve as an extender for the new Asphalt in the mix as well as a fiber reinforcement. In the stone mastic Asphalt (SMA), it could serve as the binder stiffener typically used to prevent the Asphalt from draining out of these types of Mixtures.
Kyuseok Yeon - One of the best experts on this subject based on the ideXlab platform.
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tensile reinforcement of Asphalt Concrete using polymer coating
Construction and Building Materials, 1996Co-Authors: Yongchurl Park, Kyuseok YeonAbstract:Abstract This study investigates the possibility of utilizing a polyester resin for reinforcing flexible pavements. The application of a thin-layer coating with a polymer, unsaturated polyester resin (UPR) on the surface of a laboratory-prepared unmodified Asphalt Concrete Mixture was studied as a tensile reinforcement method for such a material. Selected laboratory performance tests were conducted and the results are compared with those of a normal (uncoated) Asphalt Concrete Mixture and a modified Asphalt Mixture, both Mixtures being widely used in Korea. The polymer coating was found to be effective in improving Marshall stability, tensile strength and flexural strength of Asphalt Concrete. These improvements can be explained as the effect of reinforcement by a thin polymer layer which is fully bonded to the specimen faces. The reinforcement was also effective in reducing the stiffness of the Mixture whilst improving load-carrying capacity. This improvement in strength and reduction in stiffness resulted in a retardation of crack initiation resulting from cyclic load application and a significantly improved resistance to crack propagation. The study has shown that there is a possibility of using the polymer coating as a method of tensile reinforcement with flexible pavements.
Amir Abedin Maghanaki - One of the best experts on this subject based on the ideXlab platform.
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use of plastic waste poly ethylene terephthalate in Asphalt Concrete Mixture as aggregate replacement
Waste Management & Research, 2005Co-Authors: Abolfazl Hassani, H Ganjidoust, Amir Abedin MaghanakiAbstract:An environmental program in most regions of Iran is the large number of bottles made from poly-ethylene terephthalate (PET) deposited in domestic wastes and landfills. This article reports on an experimental study undertaken to investigate the possibility of using PET waste in Asphalt Concrete mixes as aggregate replacement (Plastiphalt). In the study, the mechanical properties of Plastiphalt mixes were compared with control samples, focusing on the parameters of Marshall stability, flow, Marshall quotient (stability-to-flow ratio) and density. The waste PET used in this study was in the form of granules of about 3 mm diameter which would replace (by volume) a portion of the mineral coarse aggregates of an equal size (2.36-4.75 mm). The results showed that the aggregate replacement of 20% by volume with PET granules would result in a reduction of 2.8% in bulk compacted mix density. The value of flow in the plastiphalt mix was lower than that of the control samples. The results also showed that when PET was used as partial aggregate replacement, the corresponding Marshall stability and Marshall quotient were almost the same as for the control samples. The authors conclude that the use of PET in this Asphalt mix is suitable for practical use and that the recycling of PET for Asphalt Concrete roads helps alleviate a difficult environmental problem.
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use of plastic waste poly ethylene terephthalate in Asphalt Concrete Mixture as aggregate replacement
Waste Management & Research, 2005Co-Authors: Abolfazl Hassani, H Ganjidoust, Amir Abedin MaghanakiAbstract:One of the environmental issues in most regions of Iran is the large number of bottles made from poly-ethylene terephthalate (PET) deposited in domestic wastes and landfills. Due to the high volume...
Ylva Edwards - One of the best experts on this subject based on the ideXlab platform.
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influence of waxes on bitumen and Asphalt Concrete Mixture performance
Road Materials and Pavement Design, 2009Co-Authors: Ylva EdwardsAbstract:This paper deals with scientific work carried out to study the influence of different kinds of wax on bitumen and Asphalt Concrete Mixture properties. Experimental parts involve base bitumens from ...
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influence of waxes on bitumen and Asphalt Concrete Mixture performance
PROCEEDINGS OF THE 4TH EURASPHALT AND EUROBITUME CONGRESS HELD MAY 2008 COPENHAGEN DENMARK, 2008Co-Authors: Ylva EdwardsAbstract:The influence of different kinds of wax on bitumen and Asphalt Concrete properties was studied. Experimental parts involve mainly 160/220 penetration bitumens from different sources, four commercial waxes and one polyphosphoric acid. Binder properties were evaluated using laboratory equipment such as dynamic shear rheometer, bending beam rheometer (BBR), differential scanning calorimeter and force ductilometer. Asphalt Concrete properties were evaluated using the tensile strain restrained specimen test (TSRST) and creep test at low temperature. At higher temperatures, dynamic creep testing and complex modulus tests were performed. Binder test results indicated that the magnitude and type of effect on bitumen rheology depend on the bitumen itself, type of crystallizing fraction in the bitumen and/or type and amount of additive used. Bitumen composition was found to be of decisive importance. For instance, adding FT-paraffin decreased the physical hardening index for all bitumens. Also polyethylene wax and montan wax showed this effect for some bitumens. Slack wax showed a large increasing effect on physical hardening. Addition of commercial waxes used showed no or marginally positive influence on bitumen ageing properties. Comparing Asphalt Mixture test results to the corresponding binder test results, the effects on Asphalt Mixtures from adding commercial wax or polyphosphoric acid were less evident. Significant binder physical hardening by BBR was not confirmed by TSRST. For the covering abstract see ITRD E157233
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Influence of commercial waxes and polyphosphoric acid on bitumen and Asphalt Concrete performance at low and medium temperatures
Materials and Structures, 2006Co-Authors: Ylva Edwards, Y. Tasdemir, U. IsacssonAbstract:The influence of adding four types of commercial wax and one polyphosphoric acid to a non-waxy bitumen was investigated with regard to binder and Asphalt Concrete Mixture performance. Binder properties were determined using dynamic shear rheometer (DSR), bending beam rheometer, force ductilometer and various conventional test methods. Asphalt Concrete performance was investigated using tensile stress restrained specimen test (TSRST), creep test at −25,^˚C, dynamic creep test at 40,^˚C and complex modulus test at 0, 10 and 20,^˚C. Totally eleven binders and eight Asphalt Mixtures were investigated. TSRST fracture temperatures of the Asphalt Mixtures were marginally influenced by the addition of any of the additives, and significant physical hardening of the binders, observed by BBR testing, could not be established using TSRST. Also in creep testing of Asphalt Mixtures at −25,^˚C, recorded effects were less pronounced compared to binder testing. In dynamic creep testing, the smallest permanent strains were recorded for the Asphalt Mixtures containing FT-paraffin or montan wax, indicating better resistance to rutting. Adding polyethylene wax or polyphosphoric acid to the non-waxy bitumen used, showed considerable positive stiffening effects on the binder at medium and higher temperatures. However, this increase in stiffness could not be shown in dynamic creep testing (at 40,^˚C) of Asphalt Concrete Mixtures containing these additives.
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influence of waxes on bitumen and Asphalt Concrete Mixture performance
The annual research report, 2005Co-Authors: Ylva EdwardsAbstract:This doctoral thesis consists of a literature review, presented in two papers, and another six papers describing experimental studies of the influence of different kinds of wax and polyphosphoric acid on bitumen and Asphalt Concrete Mixture properties. The literature review should give an extensive description of the field of knowledge concerning wax in bitumen. Effects of wax in crude oil, bitumen and Asphalt Concrete as well as test methods for studying these effects are described. Theories behind possible mechanisms are also discussed, and commercial wax as additive to bitumen for different purposes included. The experimental parts comprise laboratory studies involving totally five 160/220 penetration base bitumens from different sources, two isolated bitumen waxes, five commercial waxes and one polyphosphoric acid. Asphalt Concrete slabs, containing base or modified bitumen were prepared and tested. Binder properties were evaluated using different types of laboratory equipment, such as dynamic shear rheometer (DSR), bending beam rheometer (BBR), differential scanning calorimeter (DSC), force ductilometer, as well as equipment for determining conventional parameters like penetration, softening point, viscosity, and Fraass breaking point. Fourier Transform Infrared (FTIR) spectroscopy and Thin Layer Chromatography (TLC-FID) were used for chemical characterization. The binders were aged by means of the rolling thin film oven test (RTFOT) and pressure ageing vessel (PAV) in combination. Asphalt Concrete properties were evaluated at low temperatures using the tensile strain restrained specimen test (TSRST) and creep test at -25 degrees centigrade. Dynamic creep testing was performed at 40 degrees centigrade, as well as complex modulus tests between 0 and 20 degrees centigrade. Binder test results indicated that the magnitude and type of effect on bitumen rheology depend on the bitumen itself, type of crystallizing fraction in the bitumen and/or type and amount of additive used. Bitumen composition was found to be of decisive importance. Adding polyethylene wax or polyphosphoric acid, especially to a non-waxy 160/220 penetration grade bitumen, showed no or positive effects on the rheological behaviour at low temperatures (decrease in stiffness) as well as medium and high temperatures (increase in complex modulus and decrease in phase angle). However, the corresponding positive effects could not be shown in dynamic creep testing (at 40 degrees centigrade) of Asphalt Concrete Mixtures containing these modified binders. Adding FT-paraffin decreased the physical hardening index for all bitumens. Also polyethylene wax and montan wax showed this effect for some bitumens. Slack wax showed a large increasing effect on physical hardening, and polyphosphoric acid none or a minor negative effect. No correlation between physical hardening index (PHI) and wax content by DSC was found in this study, involving both natural bitumen wax and commercial wax. Addition of the commercial waxes used showed no or marginally positive influence on bitumen ageing properties for the bitumens and test conditions used. Comparing Asphalt Mixture test results to the corresponding binder test results, the effects on Asphalt Mixtures from adding commercial wax or polyphosphoric acid were less evident. Significant binder physical hardening by BBR could not be confirmed by TSRST (A). This document is also available at http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-553.
D E Newcomb - One of the best experts on this subject based on the ideXlab platform.
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influence of roofing shingles on Asphalt Concrete Mixture properties final report
1993Co-Authors: D E Newcomb, Mary Stroupgardiner, B Weikle, A DrescherAbstract:It is estimated that the production of new roofing shingles generates approximately 1,000,000 tons of waste annually in the U.S., and about 36,000 tons of this waste is in the Twin Cities Metro Area of Minnesota. With another 8.5 million tons of waste materials from the rebuilding of shingle or hot-mop roofs each year on a national scale, it seems viable that their use in hot-mix would be an attractive alternative to disposing of them in landfills. This report presents the results of an effort to evaluate the use of roofing waste generated by manufacturers and from reconstruction projects. It was shown that up to 5%, by weight of Mixture, manufacturing waste roofing shingles could be used in Asphalt Concrete with a minimum impact on the properties of the Mixture. At a level of 7.5%, a noticeable softening of the Mixture occurs, and this might be detrimental to pavement performance. The use of shingles from roof reconstruction projects resulted in the embrittlement of the Mixture which may be undesirable for low temperature cracking of pavements. The manufactured shingle waste seems to work well in stone mastic Asphalt Mixtures.
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Influence of roofing shingles on Asphalt Concrete Mixture properties. Final report, 1992-1993
1993Co-Authors: D E Newcomb, B Weikle, M. Stroup-gardiner, A DrescherAbstract:The objective of the study was to evaluate the use of waste shingles from manufacturing and roof reconstruction projects in hot mix Asphalt Concrete Mixtures. In dense-graded Asphalt Mixtures, it was hypothesized that the waste material might serve as an extender for the new Asphalt in the mix as well as a fiber reinforcement. In the stone mastic Asphalt (SMA), it could serve as the binder stiffener typically used to prevent the Asphalt from draining out of these types of Mixtures.
