The Experts below are selected from a list of 212835 Experts worldwide ranked by ideXlab platform
Serji N. Amirkhanian - One of the best experts on this subject based on the ideXlab platform.
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Rheological properties of modified crumb rubber asphalt binder and selecting the best modified binder using AHP method
Case Studies in Construction Materials, 2019Co-Authors: Mehdi Khalili, Kazem Jadidi, Moses Karakouzian, Serji N. AmirkhanianAbstract:Abstract Crumb rubber modifier (CRM) is one of the most popular asphalt binder modifiers due to the economic benefits and desired physical and rheological properties of asphalt Binders and asphalt mixes. This research focuses on evaluating the properties of rubber-modified asphalt Binders and selecting the best modified binder. The modified Binders were produced by blending virgin Binders with CRM at various contents of different gradations, and different methods of grinding. CRM made through ambient and cryogenic grinding methods with two gradation sizes were produced and tested. Three different virgin Binders from two sources were obtained and used. The Analytic Hierarchy Process (AHP) method was used to determine the best combination of virgin binder and CRM, based on the rheological properties and their importance in Nevada’s construction code. Based on AHP analysis, ambient CRM obtained the highest priority. CRM contents of 10% and 15% were ranked higher than 20% depending on the grade of the virgin binder. Both mesh 20 and 40 CRM sizes were favorable.
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effects of non foaming wma additives on asphalt Binders at high performance temperatures
Fuel, 2012Co-Authors: Feipeng Xiao, V S Punith, Serji N. AmirkhanianAbstract:Abstract Due to many reasons including the energy reductions and environmental benefits, warm asphalt has been gaining increasing popularity in recent years around the world. In the present study, the objective was to conduct a laboratory investigation of rheological properties of non-foaming WMA additives at high performance temperatures. The conventional testing procedures such as viscosity, performance grade, creep and creep recovery, amplitude sweep and frequency sweep as well as specific Fourier Transform Infrared Spectroscopy (FTIR) were performed to determine the influences of non-foaming additives on asphalt Binders. The experimental design included eight Binders and four non-foaming WMA additives. The test results indicated that, the non-foaming WMA additive can slightly reduce the viscosity value of asphalt binder and thus decrease the mixing and compaction temperatures of the mixture. The Binders containing non-foam additive have a slight increase in high failure temperatures compared to control binder and thus improving the rutting resistance of the mixtures. In addition, creep recovery, amplitude and frequency sweep tests show that the Binders with Sasobit has a slightly higher complex modulus but exhibits lower creep compliance and phase angle than the binder containing other WMA additives regardless of asphalt type and grade. Furthermore, FTIR analysis results indicate that the binder type plays a key role in determining the rheological properties of WMA Binders.
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Rheology of warm mix asphalt Binders with aged Binders
Construction and Building Materials, 2011Co-Authors: Hakseo Kim, Soonjae Lee, Serji N. AmirkhanianAbstract:Abstract This study addresses the rheological investigation of properties of warm mix asphalt (WMA) Binders containing long-term aged Binders. The recycled Binders with the additives were produced using two (i.e., zeolite Aspha-min® and wax Sasobit®) of the available warm asphalt processes. The main rheological factors selected in this study were relationships between loading and response as a function of time, temperature and frequency using a Bohlin Dynamic Shear Rheometer II. The results indicated that the addition of Sasobit® into recycled Binders played an important role in determination of the binder properties evaluated in this study. The use of lower performance grade (PG) as a virgin binder (PG 58-28 in this study) was critical on offsetting the change of rheological binder properties due to the warm additives and the aged Binders.
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interaction effects of crumb rubber modified asphalt Binders
Construction and Building Materials, 2010Co-Authors: Kyudong Jeong, Serji N. Amirkhanian, Soonjae Lee, Kwang W KimAbstract:Abstract The application of crumb rubber in asphalt mixtures is intended to improve the binder properties by reducing the binder’s inherent temperature susceptibility. This research investigated the interaction effects of CRM Binders as a function of various blending treatments in the laboratory. For this study, CRM Binders were produced using seven blending times (5, 30, 60, 90, 120, 240, and 480 min), three blending temperatures (177, 200, and 223 °C), and four rubber contents (5%, 10%, 15%, and 20% by weight of asphalt binder). The results from this study showed that (1) The interaction time and interaction temperature for CRM Binders were observed to have significant effect on the binder properties; (2) The longer time and higher temperature for interaction of CRM Binders resulted in an increase in the high failure temperature and the viscosity. This is thought to be due to the increase in the rubber mass through binder absorption. However, this study found that the control binder of PG 64-22 had little change of the binder properties as a function of interaction conditions; (3) The CRM percentage influence is statistically significant on the viscosity and G*/sin δ values. Also, the asphalt binder with higher CRM percentage showed a higher large molecular size (LMS) value, and the increase in CRM percentage is considered to result in the additional loss of the low molecular weight in the asphalt binder to the CRM.
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Characterization of warm mix asphalt Binders containing artificially long-term aged Binders
Construction and Building Materials, 2009Co-Authors: Soonjae Lee, Serji N. Amirkhanian, Nam-won Park, Kwang W KimAbstract:Abstract Reclaimed asphalt pavement (RAP) comprises one of the largest recycled materials, and warm mix asphalt (WMA) technologies become more commonly used due to their promising advantages in the United States and Europe. This paper addresses the laboratory investigation of performance properties of WMA Binders containing aged Binders. The recycled Binders with the additives were produced using two (i.e., zeolite Aspha-min® and wax Sasobit®) of the available warm asphalt processes. The recycled WMA Binders were artificially short-term and then long-term aged through the rolling thin film oven (RTFO) and pressure aging vessel (PAV) procedures. Superpave binder tests were carried out on the Binders through the rotational viscometer, the dynamic shear rheometer (DSR), and the bending beam rheometer (BBR). In general, the results of this study indicated that (1) the additives and aged Binders played an important role in determination of the binder properties; (2) the use of lower PG grade as a virgin binder (PG 58-28 in this study) was critical on offsetting the increase of binder stiffness caused by the addition of WMA additives and aged Binders; and (3) even at the low recycling percentage of 15%, the lower PG grade was needed to get the results meeting current Superpave binder requirements.
Soonjae Lee - One of the best experts on this subject based on the ideXlab platform.
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Rheology of warm mix asphalt Binders with aged Binders
Construction and Building Materials, 2011Co-Authors: Hakseo Kim, Soonjae Lee, Serji N. AmirkhanianAbstract:Abstract This study addresses the rheological investigation of properties of warm mix asphalt (WMA) Binders containing long-term aged Binders. The recycled Binders with the additives were produced using two (i.e., zeolite Aspha-min® and wax Sasobit®) of the available warm asphalt processes. The main rheological factors selected in this study were relationships between loading and response as a function of time, temperature and frequency using a Bohlin Dynamic Shear Rheometer II. The results indicated that the addition of Sasobit® into recycled Binders played an important role in determination of the binder properties evaluated in this study. The use of lower performance grade (PG) as a virgin binder (PG 58-28 in this study) was critical on offsetting the change of rheological binder properties due to the warm additives and the aged Binders.
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interaction effects of crumb rubber modified asphalt Binders
Construction and Building Materials, 2010Co-Authors: Kyudong Jeong, Serji N. Amirkhanian, Soonjae Lee, Kwang W KimAbstract:Abstract The application of crumb rubber in asphalt mixtures is intended to improve the binder properties by reducing the binder’s inherent temperature susceptibility. This research investigated the interaction effects of CRM Binders as a function of various blending treatments in the laboratory. For this study, CRM Binders were produced using seven blending times (5, 30, 60, 90, 120, 240, and 480 min), three blending temperatures (177, 200, and 223 °C), and four rubber contents (5%, 10%, 15%, and 20% by weight of asphalt binder). The results from this study showed that (1) The interaction time and interaction temperature for CRM Binders were observed to have significant effect on the binder properties; (2) The longer time and higher temperature for interaction of CRM Binders resulted in an increase in the high failure temperature and the viscosity. This is thought to be due to the increase in the rubber mass through binder absorption. However, this study found that the control binder of PG 64-22 had little change of the binder properties as a function of interaction conditions; (3) The CRM percentage influence is statistically significant on the viscosity and G*/sin δ values. Also, the asphalt binder with higher CRM percentage showed a higher large molecular size (LMS) value, and the increase in CRM percentage is considered to result in the additional loss of the low molecular weight in the asphalt binder to the CRM.
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Characterization of warm mix asphalt Binders containing artificially long-term aged Binders
Construction and Building Materials, 2009Co-Authors: Soonjae Lee, Serji N. Amirkhanian, Nam-won Park, Kwang W KimAbstract:Abstract Reclaimed asphalt pavement (RAP) comprises one of the largest recycled materials, and warm mix asphalt (WMA) technologies become more commonly used due to their promising advantages in the United States and Europe. This paper addresses the laboratory investigation of performance properties of WMA Binders containing aged Binders. The recycled Binders with the additives were produced using two (i.e., zeolite Aspha-min® and wax Sasobit®) of the available warm asphalt processes. The recycled WMA Binders were artificially short-term and then long-term aged through the rolling thin film oven (RTFO) and pressure aging vessel (PAV) procedures. Superpave binder tests were carried out on the Binders through the rotational viscometer, the dynamic shear rheometer (DSR), and the bending beam rheometer (BBR). In general, the results of this study indicated that (1) the additives and aged Binders played an important role in determination of the binder properties; (2) the use of lower PG grade as a virgin binder (PG 58-28 in this study) was critical on offsetting the increase of binder stiffness caused by the addition of WMA additives and aged Binders; and (3) even at the low recycling percentage of 15%, the lower PG grade was needed to get the results meeting current Superpave binder requirements.
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high temperature properties of rubberized Binders containing warm asphalt additives
Construction and Building Materials, 2009Co-Authors: Chandra K Akisetty, Soonjae Lee, Serji N. AmirkhanianAbstract:Abstract Several studies have been conducted evaluating the properties of warm mix asphalt (WMA), and it is observed that warm asphalt additives work in different ways to either reduce the viscosity of the binder or to allow better workability of the mix at lower temperatures. In terms of rubberized asphalt mixtures, they are compacted at a higher temperature than conventional mixtures, based on the field experience. If the technologies of warm mix asphalt are incorporated, it is expected to reduce the mixing and compaction temperatures of rubberized asphalt mixtures to those of conventional mixtures. This paper presents the high temperature properties of rubberized Binders containing warm asphalt additives. Rubberized Binders were produced at 10% by binder weight using five binder sources, and the Binders with the additives were produced using two (i.e. Aspha-min® and Sasobit®) of the available processes and artificially short-term aged through the rolling thin film oven (RTFO) method. Tests were conducted on the Binders using the rotational viscometer and the Dynamic Shear Rheometer. The results indicated that the viscosity properties of rubberized Binders can be changed significantly through the use of warm asphalt additives. Also, the addition of the additives was found to improve rutting resistance of the rubberized Binders.
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short term aging characterization of asphalt Binders using gel permeation chromatography and selected superpave binder tests
Construction and Building Materials, 2008Co-Authors: Soonjae Lee, Serji N. Amirkhanian, Khaldoun Shatanawi, Kwang W KimAbstract:Abstract Both the rolling thin film oven test (RTFOT) and the short-term oven aging (STOA) methods are used in the laboratory to represent the aging of an asphalt binder during plant mixing, transportation and paving. The RTFOT is conducted at 163 °C for 85 min, and the recommended STOA methods are to heat the loose mix in a forced draft oven either at 135 °C for 4 h or at 154 °C for 2 h dependent on the asphalt binder’s stiffness. The actual time of short-term aging in the field varies depending on hauling distances or paving times. This research was initiated to compare the aging effects of the RTFOT and the STOA methods using the gel permeation chromatography (GPC) and selected Superpave binder tests. For this study, nine asphalt Binders were prepared, and five aging periods were used for the RTFOT and four aging treatments were selected for the STOA. Loose asphalt mixes were obtained from six field projects. The results of GPC test showed that the RTFOT method has less aging effect on the Binders than the STOA methods for asphalt mixtures prepared in the laboratory. Given the limited number of samples from the field, it was difficult to find any correlation of short-term aging between the laboratory and the field. The longer the aging time in the RTFOT led to an increase in the high temperature viscosity and the high failure temperature of asphalt Binders, the only exception being the rubber-modified Binders. The GPC was effective in evaluating the aging effect of rubber-modified Binders using different RTFOT aging times.
Murat Guler - One of the best experts on this subject based on the ideXlab platform.
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evaluation of high temperature performance of sbs gilsonite modified binder
Fuel, 2011Co-Authors: Baha Vural Kök, Mehmet Yilmaz, Murat GulerAbstract:Abstract SBS is a widely used polymer modifier for asphalt Binders to improve the performance properties of hot mix asphalt. SBS is nearly indispensable when the binder properties do not satisfy the specification requirements under hot service temperatures. One of the concerns in using such additives, however, is the increased cost especially for large-sized construction projects. If a natural modifier can be used to replace some portion of industrial modifier products, such as SBS, it would significantly help reduce the cost of pavement construction. In this study, Gilsonite, a natural asphalt, is used as a binder modifier to reduce the SBS content based on a series of rheological testing. While studies on various properties of binder that is modified only by Gilsonite are common, we investigate the effect of combining SBS and Gilsonte in the same base binder. In the first phase, the Binders modified individually with SBS and Gilsonite are evaluated in terms of based on the outcomes of dynamic shear rheometer and rotational viscosimeter tests. Then, the asphalt Binders including both SBS and Gilsonite at different contents are subjected to the same rheological testing. The results show that around 3–4% times more Gilsonite is needed to replace 1% of SBS when the two modifiers are mixed in the same binder depending on the Gilsonite/SBS ratio selected. Besides, the viscosity of modified Binders with a percent of SBS replaced with Gilsonite is always lower than that of SBS-only modified binder. It is suggested that Gilsonite can be used as an alternative modifier to reduce the cost of asphalt mixture production and compaction in the field.
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Evaluation of high temperature performance of SBS + Gilsonite modified binder
Fuel, 2011Co-Authors: Baha Vural Kök, Mehmet Yilmaz, Murat GulerAbstract:Abstract SBS is a widely used polymer modifier for asphalt Binders to improve the performance properties of hot mix asphalt. SBS is nearly indispensable when the binder properties do not satisfy the specification requirements under hot service temperatures. One of the concerns in using such additives, however, is the increased cost especially for large-sized construction projects. If a natural modifier can be used to replace some portion of industrial modifier products, such as SBS, it would significantly help reduce the cost of pavement construction. In this study, Gilsonite, a natural asphalt, is used as a binder modifier to reduce the SBS content based on a series of rheological testing. While studies on various properties of binder that is modified only by Gilsonite are common, we investigate the effect of combining SBS and Gilsonte in the same base binder. In the first phase, the Binders modified individually with SBS and Gilsonite are evaluated in terms of based on the outcomes of dynamic shear rheometer and rotational viscosimeter tests. Then, the asphalt Binders including both SBS and Gilsonite at different contents are subjected to the same rheological testing. The results show that around 3–4% times more Gilsonite is needed to replace 1% of SBS when the two modifiers are mixed in the same binder depending on the Gilsonite/SBS ratio selected. Besides, the viscosity of modified Binders with a percent of SBS replaced with Gilsonite is always lower than that of SBS-only modified binder. It is suggested that Gilsonite can be used as an alternative modifier to reduce the cost of asphalt mixture production and compaction in the field.
Kwang W Kim - One of the best experts on this subject based on the ideXlab platform.
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interaction effects of crumb rubber modified asphalt Binders
Construction and Building Materials, 2010Co-Authors: Kyudong Jeong, Serji N. Amirkhanian, Soonjae Lee, Kwang W KimAbstract:Abstract The application of crumb rubber in asphalt mixtures is intended to improve the binder properties by reducing the binder’s inherent temperature susceptibility. This research investigated the interaction effects of CRM Binders as a function of various blending treatments in the laboratory. For this study, CRM Binders were produced using seven blending times (5, 30, 60, 90, 120, 240, and 480 min), three blending temperatures (177, 200, and 223 °C), and four rubber contents (5%, 10%, 15%, and 20% by weight of asphalt binder). The results from this study showed that (1) The interaction time and interaction temperature for CRM Binders were observed to have significant effect on the binder properties; (2) The longer time and higher temperature for interaction of CRM Binders resulted in an increase in the high failure temperature and the viscosity. This is thought to be due to the increase in the rubber mass through binder absorption. However, this study found that the control binder of PG 64-22 had little change of the binder properties as a function of interaction conditions; (3) The CRM percentage influence is statistically significant on the viscosity and G*/sin δ values. Also, the asphalt binder with higher CRM percentage showed a higher large molecular size (LMS) value, and the increase in CRM percentage is considered to result in the additional loss of the low molecular weight in the asphalt binder to the CRM.
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Characterization of warm mix asphalt Binders containing artificially long-term aged Binders
Construction and Building Materials, 2009Co-Authors: Soonjae Lee, Serji N. Amirkhanian, Nam-won Park, Kwang W KimAbstract:Abstract Reclaimed asphalt pavement (RAP) comprises one of the largest recycled materials, and warm mix asphalt (WMA) technologies become more commonly used due to their promising advantages in the United States and Europe. This paper addresses the laboratory investigation of performance properties of WMA Binders containing aged Binders. The recycled Binders with the additives were produced using two (i.e., zeolite Aspha-min® and wax Sasobit®) of the available warm asphalt processes. The recycled WMA Binders were artificially short-term and then long-term aged through the rolling thin film oven (RTFO) and pressure aging vessel (PAV) procedures. Superpave binder tests were carried out on the Binders through the rotational viscometer, the dynamic shear rheometer (DSR), and the bending beam rheometer (BBR). In general, the results of this study indicated that (1) the additives and aged Binders played an important role in determination of the binder properties; (2) the use of lower PG grade as a virgin binder (PG 58-28 in this study) was critical on offsetting the increase of binder stiffness caused by the addition of WMA additives and aged Binders; and (3) even at the low recycling percentage of 15%, the lower PG grade was needed to get the results meeting current Superpave binder requirements.
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short term aging characterization of asphalt Binders using gel permeation chromatography and selected superpave binder tests
Construction and Building Materials, 2008Co-Authors: Soonjae Lee, Serji N. Amirkhanian, Khaldoun Shatanawi, Kwang W KimAbstract:Abstract Both the rolling thin film oven test (RTFOT) and the short-term oven aging (STOA) methods are used in the laboratory to represent the aging of an asphalt binder during plant mixing, transportation and paving. The RTFOT is conducted at 163 °C for 85 min, and the recommended STOA methods are to heat the loose mix in a forced draft oven either at 135 °C for 4 h or at 154 °C for 2 h dependent on the asphalt binder’s stiffness. The actual time of short-term aging in the field varies depending on hauling distances or paving times. This research was initiated to compare the aging effects of the RTFOT and the STOA methods using the gel permeation chromatography (GPC) and selected Superpave binder tests. For this study, nine asphalt Binders were prepared, and five aging periods were used for the RTFOT and four aging treatments were selected for the STOA. Loose asphalt mixes were obtained from six field projects. The results of GPC test showed that the RTFOT method has less aging effect on the Binders than the STOA methods for asphalt mixtures prepared in the laboratory. Given the limited number of samples from the field, it was difficult to find any correlation of short-term aging between the laboratory and the field. The longer the aging time in the RTFOT led to an increase in the high temperature viscosity and the high failure temperature of asphalt Binders, the only exception being the rubber-modified Binders. The GPC was effective in evaluating the aging effect of rubber-modified Binders using different RTFOT aging times.
Baha Vural Kök - One of the best experts on this subject based on the ideXlab platform.
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evaluation of high temperature performance of sbs gilsonite modified binder
Fuel, 2011Co-Authors: Baha Vural Kök, Mehmet Yilmaz, Murat GulerAbstract:Abstract SBS is a widely used polymer modifier for asphalt Binders to improve the performance properties of hot mix asphalt. SBS is nearly indispensable when the binder properties do not satisfy the specification requirements under hot service temperatures. One of the concerns in using such additives, however, is the increased cost especially for large-sized construction projects. If a natural modifier can be used to replace some portion of industrial modifier products, such as SBS, it would significantly help reduce the cost of pavement construction. In this study, Gilsonite, a natural asphalt, is used as a binder modifier to reduce the SBS content based on a series of rheological testing. While studies on various properties of binder that is modified only by Gilsonite are common, we investigate the effect of combining SBS and Gilsonte in the same base binder. In the first phase, the Binders modified individually with SBS and Gilsonite are evaluated in terms of based on the outcomes of dynamic shear rheometer and rotational viscosimeter tests. Then, the asphalt Binders including both SBS and Gilsonite at different contents are subjected to the same rheological testing. The results show that around 3–4% times more Gilsonite is needed to replace 1% of SBS when the two modifiers are mixed in the same binder depending on the Gilsonite/SBS ratio selected. Besides, the viscosity of modified Binders with a percent of SBS replaced with Gilsonite is always lower than that of SBS-only modified binder. It is suggested that Gilsonite can be used as an alternative modifier to reduce the cost of asphalt mixture production and compaction in the field.
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Evaluation of high temperature performance of SBS + Gilsonite modified binder
Fuel, 2011Co-Authors: Baha Vural Kök, Mehmet Yilmaz, Murat GulerAbstract:Abstract SBS is a widely used polymer modifier for asphalt Binders to improve the performance properties of hot mix asphalt. SBS is nearly indispensable when the binder properties do not satisfy the specification requirements under hot service temperatures. One of the concerns in using such additives, however, is the increased cost especially for large-sized construction projects. If a natural modifier can be used to replace some portion of industrial modifier products, such as SBS, it would significantly help reduce the cost of pavement construction. In this study, Gilsonite, a natural asphalt, is used as a binder modifier to reduce the SBS content based on a series of rheological testing. While studies on various properties of binder that is modified only by Gilsonite are common, we investigate the effect of combining SBS and Gilsonte in the same base binder. In the first phase, the Binders modified individually with SBS and Gilsonite are evaluated in terms of based on the outcomes of dynamic shear rheometer and rotational viscosimeter tests. Then, the asphalt Binders including both SBS and Gilsonite at different contents are subjected to the same rheological testing. The results show that around 3–4% times more Gilsonite is needed to replace 1% of SBS when the two modifiers are mixed in the same binder depending on the Gilsonite/SBS ratio selected. Besides, the viscosity of modified Binders with a percent of SBS replaced with Gilsonite is always lower than that of SBS-only modified binder. It is suggested that Gilsonite can be used as an alternative modifier to reduce the cost of asphalt mixture production and compaction in the field.