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Ylva Edwards - One of the best experts on this subject based on the ideXlab platform.
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Experience in Sweden of polymer modified waterproofing systems; I: laboratory testing of polymer modified Mastic Asphalt; II: the Hoega Kusten Bridge
2013Co-Authors: Ylva EdwardsAbstract:Experience in Sweden of polymer modified waterproofing systems. I : Laboratory testing of polymer modified Mastic Asphalt. II: The Hoga Kusten bridge
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Influence of waxes on polymer modified Mastic Asphalt performance
2012Co-Authors: Ylva EdwardsAbstract:The use of wax additives in polymer modified coarse aggregate Mastic Asphalt in Europe is reviewed. Commercial wax such as FT-paraffin and montan wax are typical so-called bitumen flow improvers, which are used for Asphalt pavements and Mastic Asphalt to reduce the mixing temperature and thereby energy consumption and emissions. Workability may be improved as well. These waxes differ a great deal from natural bitumen wax with respect to molecular weight and molecular weight distribution. They have high congealing points around 100degreesC and higher melting areas than natural wax in bitumen. Results are presented from an ongoing joint Swedish project about wax as flow improver in polymer modified bitumen for Mastic Asphalt production. Wax modification should not have any noticeable negative impact on the performance of Mastic Asphalt products at medium and lower temperatures. The project involves laboratory testing of wax and polymer modified binders and Mastic Asphalt mixtures, as well as field studies. Effects of adding two commercial waxes to one polymer modified bitumen are presented in this paper. The results show that both waxes have a flow improving/viscosity depressant impact on the polymer bitumen at higher temperatures, indicating a possible lower laying temperature for the Mastic Asphalt if modified with such waxes. Moreover, there is a stiffening effect at medium and high temperatures (below laying temperature), indicating a certain positive effect on stability. Concerning low temperature performance, there was a negative impact on crack susceptibility at low temperatures, which was larger with the addition of FT-paraffin than the addition of montan wax. For the covering abstract see ITRD E157233
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Environmental friendly wax modified Mastic Asphalt
2012Co-Authors: Ali Azhar Butt, Yuksel Tasdemir, Ylva EdwardsAbstract:Mastic Asphalt products (GussAsphalt) require high working temperatures, and harder requirements concerning bitumen fumes and carbon dioxide emissions. Consequently, the need of a new means of prod ...
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Energy saving and environmental friendly wax concept for polymer modified Mastic Asphalt
Materials and Structures, 2010Co-Authors: Ylva Edwards, Yuksel Tasdemir, Ali Azhar ButtAbstract:This paper focuses on the addition of commercial wax as flow improver in polymer modified bitumen intended for use in Mastic Asphalt pavements under Nordic climatic conditions. Different aspects are dealt with. The aim of the project is to make Mastic Asphalt used in Sweden today (for bridges, parking decks etc.) more environment friendly and easier to handle. However, wax modification must not have any noticeable negative impact on the performance of Mastic Asphalt at medium and lower temperatures. The project involves laboratory testing of wax and polymer modified binder mixtures as well as Mastic Asphalt mixtures. Effects of adding two commercial waxes to one polymer modified bitumen have been studied. The results show that both waxes have a flow improving/viscosity depressant impact on the polymer modified bitumen at higher temperatures, indicating a possible lower laying temperature for the Mastic Asphalt if modified with such waxes. Moreover, there is a stiffening effect at medium and high temperatures (below placing temperature), indicating a certain positive effect on stability. Concerning low temperature performance, there are results indicating some negative impact on crack susceptibility at low temperatures, more by the addition of one of the waxes than by addition of the other. However, it could be concluded that using up to at least 4% of either wax additive will improve workability for the Mastic Asphalt product under investigation making it possible to lower working temperatures without seriously affecting its good performance in any negative way.
Ali Azhar Butt - One of the best experts on this subject based on the ideXlab platform.
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Environmental friendly wax modified Mastic Asphalt
2012Co-Authors: Ali Azhar Butt, Yuksel Tasdemir, Ylva EdwardsAbstract:Mastic Asphalt products (GussAsphalt) require high working temperatures, and harder requirements concerning bitumen fumes and carbon dioxide emissions. Consequently, the need of a new means of prod ...
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Low temperature performance of wax modified Mastic Asphalt
2011Co-Authors: Ali Azhar ButtAbstract:The current interest in energy saving Asphalt production techniques is great and several new processes have been developed to reduce the mixing and compaction temperatures for hot mix Asphalt. In particular, Mastic Asphalt products (GussAsphalt) require high working temperatures, and harder requirements concerning bitumen fumes and carbon dioxide emissions have been introduced for such products. Consequently, the need of a new means of producing and placing Mastic Asphalt at lower temperatures is particularly large. One way of reducing Asphalt mixture temperature is by using special flow improving additives like wax. This technique has successively been tried in several studies for polymer modified Mastic Asphalt used for bridge decks and parking areas in Sweden. However, there still are uncertainties about possible negative impact on crack susceptibility at lower temperatures due to the addition of wax. In this study, 4% montan wax (Asphaltan A) was used for one particular polymer modified Mastic Asphalt product. Type and amount of wax additive was selected based on results from earlier studies. The impact on binder, binder/filler mixtures and Mastic Asphalt from production was tested in the laboratory, focusing on low temperature performance. The bending beam rheometer (BBR) was used for determining low temperature creep compliance and the tensile stress restrained specimen test (TSRST) for determining fracture temperatures. Binder properties were determined using dynamic mechanical analysis (DMA), Fourier transform infrared (FTIR) spectroscopy and conventional tests (softening point, penetration, elastic recovery, Fraass breaking point, viscosity and storage stability). Aging was performed using the rolling thin film oven test (RTFOT) at 200°C. As expected, the addition of wax to the polymer modified binder showed a viscosity reduction at higher temperatures, corresponding to a similar positive effect of more than 10°C on production and laying temperature for the Mastic Asphalt. DMA and BBR results showed some increase in stiffness and a more elastic response of the wax modified binder at medium and low temperatures. The TSRST fracture temperature was 5 °C higher for the Mastic Asphalt containing 4% wax, indicating however no dramatic negative impact on crack susceptibility.
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Energy saving and environmental friendly wax concept for polymer modified Mastic Asphalt
Materials and Structures, 2010Co-Authors: Ylva Edwards, Yuksel Tasdemir, Ali Azhar ButtAbstract:This paper focuses on the addition of commercial wax as flow improver in polymer modified bitumen intended for use in Mastic Asphalt pavements under Nordic climatic conditions. Different aspects are dealt with. The aim of the project is to make Mastic Asphalt used in Sweden today (for bridges, parking decks etc.) more environment friendly and easier to handle. However, wax modification must not have any noticeable negative impact on the performance of Mastic Asphalt at medium and lower temperatures. The project involves laboratory testing of wax and polymer modified binder mixtures as well as Mastic Asphalt mixtures. Effects of adding two commercial waxes to one polymer modified bitumen have been studied. The results show that both waxes have a flow improving/viscosity depressant impact on the polymer modified bitumen at higher temperatures, indicating a possible lower laying temperature for the Mastic Asphalt if modified with such waxes. Moreover, there is a stiffening effect at medium and high temperatures (below placing temperature), indicating a certain positive effect on stability. Concerning low temperature performance, there are results indicating some negative impact on crack susceptibility at low temperatures, more by the addition of one of the waxes than by addition of the other. However, it could be concluded that using up to at least 4% of either wax additive will improve workability for the Mastic Asphalt product under investigation making it possible to lower working temperatures without seriously affecting its good performance in any negative way.
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The Effect of Wax Modification on the Performance of Mastic Asphalt
International journal of pavement research and technology, 2010Co-Authors: Ali Azhar Butt, Yuksel Tasdemir, Denis Jelagin, Björn BirgissonAbstract:The scope of this study is to evaluate the mechanical performance of the polymer modified Mastic Asphalt with 4% montan wax (Asphaltan A) additive. The impact of wax modification on binder, binder/ ...
Atakan Aksoy - One of the best experts on this subject based on the ideXlab platform.
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evaluation of sbs modified stone Mastic Asphalt pavement performance
Construction and Building Materials, 2013Co-Authors: Celaleddin E Sengul, Seref Oruc, Erol Iskender, Atakan AksoyAbstract:The purpose of this study is to research SBS polymer modified stone Mastic Asphalt (SMA) pavement performance. With this scope Marshall test (ASTM D1559) test was verified and optimal bitumen contents were calculated with experimental stages. At the optimal bitumen content control and SBS SMA mixtures were evaluated with Marshall Quotient (MQ) approach, repeated creep test (RCT), indirect tensile strength test (ITST), Laboratoire Central des Ponts et Chaussees (LCPC) Wheel tracking tests. According to the MQ results SBS modified samples gives higher values than conventional control mixtures. Higher MQ can be thought as more resistance to the plastic deformation. Controversial results can be obtained with MQ approach for some types of Asphalt mixture gradations. Because of structural integrity and stone on stone contact gradation for SMA MQ approach gives more harmonious results. Efficiency of SBS polymer was confirmed with MQ method. Modified samples gave higher indirect tensile strength than control ones. RCT and LCPC wheel tracking test results shows that SBS modified mixtures have lower rutting values than the conventional mixtures.
Celaleddin E Sengul - One of the best experts on this subject based on the ideXlab platform.
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evaluation of sbs modified stone Mastic Asphalt pavement performance
Construction and Building Materials, 2013Co-Authors: Celaleddin E Sengul, Seref Oruc, Erol Iskender, Atakan AksoyAbstract:The purpose of this study is to research SBS polymer modified stone Mastic Asphalt (SMA) pavement performance. With this scope Marshall test (ASTM D1559) test was verified and optimal bitumen contents were calculated with experimental stages. At the optimal bitumen content control and SBS SMA mixtures were evaluated with Marshall Quotient (MQ) approach, repeated creep test (RCT), indirect tensile strength test (ITST), Laboratoire Central des Ponts et Chaussees (LCPC) Wheel tracking tests. According to the MQ results SBS modified samples gives higher values than conventional control mixtures. Higher MQ can be thought as more resistance to the plastic deformation. Controversial results can be obtained with MQ approach for some types of Asphalt mixture gradations. Because of structural integrity and stone on stone contact gradation for SMA MQ approach gives more harmonious results. Efficiency of SBS polymer was confirmed with MQ method. Modified samples gave higher indirect tensile strength than control ones. RCT and LCPC wheel tracking test results shows that SBS modified mixtures have lower rutting values than the conventional mixtures.
J A Scherocman - One of the best experts on this subject based on the ideXlab platform.
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THE CONSTRUCTION AND PERFORMANCE OF STONE Mastic Asphalt PAVEMENTS IN THE UNITED STATES
1997Co-Authors: J A ScherocmanAbstract:Stone Mastic Asphalt (SMA) pavements were first built in the United States in 1991 using technology obtained from Europe. It was determined, however, that significant differences exist in the aggregate properties and mix design methods used. In addition, differences in the plant production methods and in the laydown and compaction procedures are present. This resulted in a number of problems in constructing the SMA pavements. These are discussed in this paper. To date, after up to six years of service under traffic, the performance of the SMA pavements has been excellent.
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THE DESIGN, CONSTRUCTION AND PERFORMANCE OF STONE Mastic Asphalt PAVEMENT LAYERS
1992Co-Authors: J A ScherocmanAbstract:Stone Mastic Asphalt (SMA) pavements layers have been constructed in Europe for more than twenty years. The primary function of this type of pavement is to reduce the amount of permanent deformation that often occurs with dense graded Asphalt concrete mixtures when subjected to heavy loads. In the fall of 1990, a group of highway department officials and Asphalt paving contractors made a tour of roadways that had been constructed in six different countries in Europe. As a result of that tour, interest was raised in transferring the technology to the United States to build SMA pavement layers to withstand heavy traffic loads. In 1991, five major stone Mastic Asphalt pavements trial sections were constructed in the U.S. - in the states of Wisconsin, Georgia, Michigan, Missouri and Indiana. A brief description of the materials that were used in the SMA mix design is provided in the paper. Emphasis is placed on the type of stabilizing agent that was incorporated into the SMA mix. Reviewed in the paper are some potential problem areas which must be considered when designing a SMA mix, manufacturing the mix in a batch or drum mix plant, and placing and compacting the mix on the roadway. For the covering abstract of this Conference see IRRD abstract number 807982. (A)
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CONSTRUCTION OF STONE Mastic Asphalt TEST SECTIONS IN THE U.S. (WITH DISCUSSION)
1992Co-Authors: J A ScherocmanAbstract:Stone Mastic Asphalt (SMA) mixtures have been successfully constructed in Europe for more than twenty years. Now the transfer of that technology is being attempted in both Canada and the U.S. But SMA mixtures in Europe are produced using different materials, mix design methods, and plant and paving equipment than those found in North America. Those differences are discussed in this paper. Initial SMA projects have been constructed in the province of Ontario as well as in the states of Wisconsin, Georgia, Michigan, and Missouri. Different aggregate gradations, additives, and Asphalt cement contents were employed in the various mixes. It was found that there are several areas for potential problems during the design, manufacture, placement, and compaction of the SMA mixtures. Those potential problem areas are also discussed.
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STONE Mastic Asphalt REDUCES RUTTING
Better Roads, 1991Co-Authors: J A ScherocmanAbstract:Discusses stone Mastic Asphalt (SMA) and specifically a project completed on a 0.6-mile section of Interstate Route 94, west of Milwaukee, Wisconsin. SMA mixes are used in Europe to reduce permanent deformation (rutting) of Asphalt concrete pavement layers under heavy truck traffic. Describes Asphalt mixture, mix design, and mix application.