The Experts below are selected from a list of 4647 Experts worldwide ranked by ideXlab platform
Yuan Zhang - One of the best experts on this subject based on the ideXlab platform.
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Assessment of effectiveness of rejuvenator on artificially aged Porous Asphalt concrete
Construction and Building Materials, 2016Co-Authors: Yuan Zhang, André Molenaar, S.p. WuAbstract:Abstract The service life of Porous Asphalt pavements is limited due to raveling. Preventive maintenance to Porous Asphalt pavements by means of spraying rejuvenators on the pavement surfaces is considered as cost-effective. In the research of this paper, a loose Asphalt mixture was artificially aged and then compacted. A rejuvenator was applied to the prepared Porous Asphalt concrete specimens. The stiffness modulus and indirect tensile strength of the specimens were measured using the indirect tensile tests. The results show that the application of the rejuvenator did not change the stiffness modulus and indirect tensile strength of the Porous Asphalt concrete specimens.
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Preventive maintenance of Porous Asphalt concrete using surface treatment technology
Materials and Design, 2016Co-Authors: Yuan Zhang, Martin Van De Ven, André Molenaar, Shaopeng WuAbstract:Porous Asphalt concrete is widely used as a surfacing layer on highways in the Netherlands because of its benefit that it is effective in reducing traffic noise. However, the service life of Porous Asphalt wearing courses is limited due to the fact that it is vulnerable to raveling. A preventive maintenance strategy using surface treatment material is being considered as a cost-effective and environmentally sustainable option to extend the service life of existing Porous Asphalt wearing courses. In this paper, the effect of a surface treatment to Porous Asphalt wearing courses is discussed. A surface treatment material was sprayed on the Porous Asphalt pavement surfaces in two field trials. Computed Tomography (CT) scans were performed on the Porous Asphalt concrete cores from the field trials to measure their volumetric properties. The rotating surface abrasion tests were used to determine the raveling resistance of the Porous Asphalt concrete samples. Finite element models with a realistic structure of the Porous Asphalt concrete were created for analyzing the stresses and strains as a result of traffic loads in the pavement surface with the surface treatment material. It is found that the effect of the surface treatment is positive.
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Increasing the Service Life of Porous Asphalt with Rejuvenators
Sustainable Construction Materials 2012, 2012Co-Authors: Yuan Zhang, Mfc Van De Ven, A A A MolenaarAbstract:The combination of load repetitions and severe environmental conditions (aging, moisture ingression, etc.) are causing ravelling (losing of the stones at the top) of Porous Asphalt. Ravelling has a strong influence on the service life, especially in the slow lane. The service life of Porous Asphalt can be extended by improving the self-healing capability in time. In this paper, the rejuvenation approach is described to upgrade the self-healing capability during service life. With this approach, the Porous Asphalt is rejuvenated from outside at the top in order to regain the self-healing capability. Experience with some test trials is described. After the treatment with rejuvenators, the beams from the single-layer Porous Asphalt show a higher bending stiffness in the 3-point bending test. The beams from the two-layer Porous Asphalt show a lower bending stiffness after treatment. The results of Rotating Surface Abrasion Test (RSAT) indicate that the rejuvenators can improve the ravelling resistance of Porous Asphalt. The rejuvenation approach can be very cost-effective not only for Porous Asphalt but also for other (noise-reducing) thin-surface layers and Asphalt concrete containing highly aged reclaimed Asphalt.
Erik Schlangen - One of the best experts on this subject based on the ideXlab platform.
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Unravelling Porous Asphalt concrete with induction heating
Construction and Building Materials, 2014Co-Authors: Quantao Liu, Erik Schlangen, Gerbert Van BochoveAbstract:Abstract Ravelling is the main defect of Porous Asphalt pavement. An unravelling Porous Asphalt was developed in this research. Steel wool was added to Porous Asphalt concrete and induction heating was used to heal the cracks at early stage to prevent ravelling. In this paper, the mixing procedure was optimized to disperse steel wool into Asphalt mixture, the induction heating potential of Porous Asphalt concrete containing steel wool was measured, and Rotating Surface Abrasion Test with rest periods to apply induction heating was employed to study the ravelling resistance improvement of Porous Asphalt concrete. It was found that Porous Asphalt concrete containing steel wool can be heated with induction energy and induction heating can greatly reduce the stone loss of Porous Asphalt concrete, despite when induction heating was applied. Porous Asphalt suffered less ravelling damage when induction heating was applied at an earlier stage. It is concluded that unravelling Porous Asphalt can be achieved by applying induction heating and induction should be applied at an early stage.
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Induction Healing of Porous Asphalt Concrete Beams on an Elastic Foundation
Journal of Materials in Civil Engineering, 2013Co-Authors: Quantao Liu, Erik Schlangen, Martin Van De VenAbstract:AbstractThe objective of this paper is to evaluate the healing capacity of steel wool–reinforced Porous Asphalt concrete. The healing is initiated with induction heating. Bending fracture tests on an elastic foundation are used to prove the healing mechanism. Porous Asphalt concrete beams on an elastic foundation were fractured at 5°C; subsequently, they were heated with induction energy, and finally fractured again. The recovered fracture resistance of the beams was used as a healing indicator. Totally fractured Porous Asphalt beams can regain 78.8% of their bending resistance (strength) when induction heating is applied. It was also found that the optimal heating temperature is 85°C for Porous Asphalt beams to obtain the highest strength recovery. Reheating of the fractured beams does not decrease the recovery of the flexural resistance, which means that the heating can be repeated when cracks return. On the basis of these findings, it is expected that the healing potential of Porous Asphalt concrete an...
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Induction Healing of Porous Asphalt
Transportation Research Record, 2012Co-Authors: Quantao Liu, Erik Schlangen, Martin Van De VenAbstract:Research on the induction healing of Porous Asphalt is summarized. Steel wool is added to Porous Asphalt concrete to make it electrically conductive and suitable for induction heating. When microcracks occur in the material, an induction generator is used to heat the material to close the cracks by the high-temperature self-healing of bitumen. The electrical resistance and induction heating speed of Porous Asphalt concrete reinforced with steel wool are examined. Porous Asphalt concrete containing steel wool is found to be electrically conductive and can be heated with induction energy. The mechanical properties of this Porous Asphalt are also studied. Steel wool can reinforce Porous Asphalt concrete by increasing its strength, particle loss (raveling) resistance, and fatigue resistance. Furthermore, the induction healing effect of this Porous Asphalt concrete reinforced with steel wool is evaluated. It is proved that the fatigue life of induction-healing Porous Asphalt can be extended significantly by the application of induction heating. It is also found that the optimal heating temperature for the best healing effect is 85°C. These findings indicate that the self-healing potential of Porous Asphalt concrete and the durability of Porous Asphalt pavement are improved by induction heating. Finally, a test section was paved on the Dutch A58 motorway with a Porous Asphalt layer containing steel wool. Because Asphalt concrete exhibits better self-healing at higher temperatures, the future for the application of induction-healing Porous Asphalt concrete appears to be promising.
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induction healing of Asphalt mastic and Porous Asphalt concrete
Construction and Building Materials, 2011Co-Authors: Alvaro Garcia, Erik SchlangenAbstract:The objective of this paper is to detect the healing effect of Asphalt mastic and Porous Asphalt concrete caused by induction heating. It was found that the broken mastic beams could be healed many times by induction heating. Moreover, the stiffness of Porous Asphalt concrete recovered more and faster when induction heating was applied to the samples. It was also found that fatigue life of Porous Asphalt concrete was significantly extended by induction heating. Based on these findings, it was concluded that the self healing rate of Asphalt mastic and Porous Asphalt concrete can be increased by induction heating.
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Optimization of Steel Fiber Used for Induction Heating in Porous Asphalt Concrete
Traffic and Transportation Studies 2010, 2010Co-Authors: Quantao Liu, Martin Van De Ven, Erik Schlangen, Marco PootAbstract:An electrically conductive Porous Asphalt concrete used for induction heating and subsequently healing of cracks is prepared by adding conductive materials (steel fibers and steel wool) in this research. In this paper, the optimization of steel fiber used for induction heating is reported based on the electrical resistivity, induction heating speed and particle loss resistance of Porous Asphalt concrete. It is found that Porous Asphalt concrete containing steel fiber with smaller diameter or longer steel fiber is more electrically conductive and induction heatable than that containing the same content of steel fiber with bigger diameter or short steel fiber. It is also found that steel wool type 00 with length of 9.5 mm is more effective than short steel fiber type 1 and steel wool type 000 to improve the particle resistance of Porous Asphalt concrete. Finally, 8% (by volume of bitumen) of steel wool type 00 is considered as the best option used for induction heating in Porous Asphalt concrete.
Francesco Canestrari - One of the best experts on this subject based on the ideXlab platform.
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Improved durability of recycled Porous Asphalt
Construction and Building Materials, 2013Co-Authors: F. Frigio, Emiliano Pasquini, Gilda Ferrotti, Francesco CanestrariAbstract:Abstract Porous Asphalt mixtures are extensively used as highway surface layer due to their benefit in improving skid resistance and reducing spray and splash effects during wet conditions. Moreover, Porous Asphalts (PA) are also oriented towards the reduction of road traffic noise thanks to enhanced sound absorption capabilities. Nevertheless, the limited durability of Porous Asphalt layers leads to frequent maintenance and rehabilitation activities. In this study, the use of course reclaimed Asphalt (RA), obtained by milling old Porous surface layers, as aggregate in new PA mixtures was evaluated. Preliminary, Binder Bond Strength tests on coated and uncoated basalt aggregate substrates showed encouraging results in terms of adhesion properties between unaged polymer modified bitumens and substrates coated with aged bitumens, simulating RA aggregates. Thus, five Porous Asphalt mixtures prepared with 15% course RA aggregates and different total binder contents were studied in the laboratory. A reference PA mixture containing only virgin aggregates was also investigated for comparison purposes. Indirect tensile strength tests, particle loss (Cantabro) tests, semi circular bending (SCB) tests and repeated indirect tensile tests were carried out in both dry and wet conditions in order to evaluate acceptability, durability, fracture resistance and water sensitivity of recycled mixtures. Results showed that recycled Porous Asphalt mixtures can perform as well as (or even better than) reference one. In particular, recycled mixtures at equal or higher binder contents than the reference mixture demonstrated an improvement in moisture resistance and durability.
Martin Van De Ven - One of the best experts on this subject based on the ideXlab platform.
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Preventive maintenance of Porous Asphalt concrete using surface treatment technology
Materials and Design, 2016Co-Authors: Yuan Zhang, Martin Van De Ven, André Molenaar, Shaopeng WuAbstract:Porous Asphalt concrete is widely used as a surfacing layer on highways in the Netherlands because of its benefit that it is effective in reducing traffic noise. However, the service life of Porous Asphalt wearing courses is limited due to the fact that it is vulnerable to raveling. A preventive maintenance strategy using surface treatment material is being considered as a cost-effective and environmentally sustainable option to extend the service life of existing Porous Asphalt wearing courses. In this paper, the effect of a surface treatment to Porous Asphalt wearing courses is discussed. A surface treatment material was sprayed on the Porous Asphalt pavement surfaces in two field trials. Computed Tomography (CT) scans were performed on the Porous Asphalt concrete cores from the field trials to measure their volumetric properties. The rotating surface abrasion tests were used to determine the raveling resistance of the Porous Asphalt concrete samples. Finite element models with a realistic structure of the Porous Asphalt concrete were created for analyzing the stresses and strains as a result of traffic loads in the pavement surface with the surface treatment material. It is found that the effect of the surface treatment is positive.
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Induction Healing of Porous Asphalt Concrete Beams on an Elastic Foundation
Journal of Materials in Civil Engineering, 2013Co-Authors: Quantao Liu, Erik Schlangen, Martin Van De VenAbstract:AbstractThe objective of this paper is to evaluate the healing capacity of steel wool–reinforced Porous Asphalt concrete. The healing is initiated with induction heating. Bending fracture tests on an elastic foundation are used to prove the healing mechanism. Porous Asphalt concrete beams on an elastic foundation were fractured at 5°C; subsequently, they were heated with induction energy, and finally fractured again. The recovered fracture resistance of the beams was used as a healing indicator. Totally fractured Porous Asphalt beams can regain 78.8% of their bending resistance (strength) when induction heating is applied. It was also found that the optimal heating temperature is 85°C for Porous Asphalt beams to obtain the highest strength recovery. Reheating of the fractured beams does not decrease the recovery of the flexural resistance, which means that the heating can be repeated when cracks return. On the basis of these findings, it is expected that the healing potential of Porous Asphalt concrete an...
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Induction Healing of Porous Asphalt
Transportation Research Record, 2012Co-Authors: Quantao Liu, Erik Schlangen, Martin Van De VenAbstract:Research on the induction healing of Porous Asphalt is summarized. Steel wool is added to Porous Asphalt concrete to make it electrically conductive and suitable for induction heating. When microcracks occur in the material, an induction generator is used to heat the material to close the cracks by the high-temperature self-healing of bitumen. The electrical resistance and induction heating speed of Porous Asphalt concrete reinforced with steel wool are examined. Porous Asphalt concrete containing steel wool is found to be electrically conductive and can be heated with induction energy. The mechanical properties of this Porous Asphalt are also studied. Steel wool can reinforce Porous Asphalt concrete by increasing its strength, particle loss (raveling) resistance, and fatigue resistance. Furthermore, the induction healing effect of this Porous Asphalt concrete reinforced with steel wool is evaluated. It is proved that the fatigue life of induction-healing Porous Asphalt can be extended significantly by the application of induction heating. It is also found that the optimal heating temperature for the best healing effect is 85°C. These findings indicate that the self-healing potential of Porous Asphalt concrete and the durability of Porous Asphalt pavement are improved by induction heating. Finally, a test section was paved on the Dutch A58 motorway with a Porous Asphalt layer containing steel wool. Because Asphalt concrete exhibits better self-healing at higher temperatures, the future for the application of induction-healing Porous Asphalt concrete appears to be promising.
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Optimization of Steel Fiber Used for Induction Heating in Porous Asphalt Concrete
Traffic and Transportation Studies 2010, 2010Co-Authors: Quantao Liu, Martin Van De Ven, Erik Schlangen, Marco PootAbstract:An electrically conductive Porous Asphalt concrete used for induction heating and subsequently healing of cracks is prepared by adding conductive materials (steel fibers and steel wool) in this research. In this paper, the optimization of steel fiber used for induction heating is reported based on the electrical resistivity, induction heating speed and particle loss resistance of Porous Asphalt concrete. It is found that Porous Asphalt concrete containing steel fiber with smaller diameter or longer steel fiber is more electrically conductive and induction heatable than that containing the same content of steel fiber with bigger diameter or short steel fiber. It is also found that steel wool type 00 with length of 9.5 mm is more effective than short steel fiber type 1 and steel wool type 000 to improve the particle resistance of Porous Asphalt concrete. Finally, 8% (by volume of bitumen) of steel wool type 00 is considered as the best option used for induction heating in Porous Asphalt concrete.
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Healing of Porous Asphalt Concrete via Induction Heating
Road Materials and Pavement Design, 2010Co-Authors: Quantao Liu, Martin Van De Ven, Erik Schlangen, Alvaro GarciaAbstract:ABSTRACT The lifetime of Porous Asphalt pavement is only about 11 years. In this research, a Porous Asphalt concrete with long lifetime, based on a healing mechanism triggered by means of induction heating, is explained. Conductive fillers (steel fibers and steel wool) are added to Porous Asphalt concrete to enhance its electrical conductivity and induction heating is used to increase the temperature locally, just enough to increase the healing rate of Asphalt concrete to heal the micro-cracks and to repair the bond between aggregates and binder. The main purposes of this research are to examine the electrical conductivity, particle loss resistance and induction heating speed of electrically conductive Porous Asphalt concrete and prove that damage in the material can be healed via induction heating. It is found that long fibers with small diameter are better than short fibers with bigger diameter to make Porous Asphalt concrete electrically conductive, induction heatable and have high particle loss resist...
André Molenaar - One of the best experts on this subject based on the ideXlab platform.
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Assessment of effectiveness of rejuvenator on artificially aged Porous Asphalt concrete
Construction and Building Materials, 2016Co-Authors: Yuan Zhang, André Molenaar, S.p. WuAbstract:Abstract The service life of Porous Asphalt pavements is limited due to raveling. Preventive maintenance to Porous Asphalt pavements by means of spraying rejuvenators on the pavement surfaces is considered as cost-effective. In the research of this paper, a loose Asphalt mixture was artificially aged and then compacted. A rejuvenator was applied to the prepared Porous Asphalt concrete specimens. The stiffness modulus and indirect tensile strength of the specimens were measured using the indirect tensile tests. The results show that the application of the rejuvenator did not change the stiffness modulus and indirect tensile strength of the Porous Asphalt concrete specimens.
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Preventive maintenance of Porous Asphalt concrete using surface treatment technology
Materials and Design, 2016Co-Authors: Yuan Zhang, Martin Van De Ven, André Molenaar, Shaopeng WuAbstract:Porous Asphalt concrete is widely used as a surfacing layer on highways in the Netherlands because of its benefit that it is effective in reducing traffic noise. However, the service life of Porous Asphalt wearing courses is limited due to the fact that it is vulnerable to raveling. A preventive maintenance strategy using surface treatment material is being considered as a cost-effective and environmentally sustainable option to extend the service life of existing Porous Asphalt wearing courses. In this paper, the effect of a surface treatment to Porous Asphalt wearing courses is discussed. A surface treatment material was sprayed on the Porous Asphalt pavement surfaces in two field trials. Computed Tomography (CT) scans were performed on the Porous Asphalt concrete cores from the field trials to measure their volumetric properties. The rotating surface abrasion tests were used to determine the raveling resistance of the Porous Asphalt concrete samples. Finite element models with a realistic structure of the Porous Asphalt concrete were created for analyzing the stresses and strains as a result of traffic loads in the pavement surface with the surface treatment material. It is found that the effect of the surface treatment is positive.
