The Experts below are selected from a list of 378813 Experts worldwide ranked by ideXlab platform
Raúl Luis Zerbino - One of the best experts on this subject based on the ideXlab platform.
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Mechanical response of fiber reinforced concrete Overlays over asphalt concrete substrate: Experimental results and numerical simulation
Construction and Building Materials, 2015Co-Authors: Facundo Isla, Bibiana Luccioni, Gonzalo Ruano, María Celeste Torrijos, Francisco Morea, Graciela Marta Giaccio, Raúl Luis ZerbinoAbstract:Abstract Fiber reinforced concrete Overlays are nowadays an alternative for repairing and reinforcing pavements. The contribution of concrete Overlays strongly depends on the bond with the substrate. The fibers help sewing contraction joints and eventual cracks and, in this way prevent the propagation of cracks along the substrate–Overlay interface. Therefore, the addition of fibers to the Overlay allows reducing repair thickness, increasing service life and improving pavements general performance. Some experimental tests performed for the development of a method to assess different fibers efficiency in this type of applications are presented in this paper. Substrate–Overlay composite beams are tested under flexure. The beams consist of Overlays of plain and fiber reinforced concretes, containing steel and macro-synthetic fibers, applied over an asphalt concrete substrate. The numerical simulation of the beams is also included in the paper. Fiber reinforced concrete is considered as a composite material made of a concrete matrix and fibers and its mechanical behavior is modeled with a simple homogenization approach based on modified mixture theory. The numerical simulation can accurately reproduce material characterization tests and predict the bearing capacity of the composite beams. Furthermore, other substrate/Overlay alternatives are numerically studied. The numerical results could be useful to improve the design of these intervention techniques.
William O. Tribbett - One of the best experts on this subject based on the ideXlab platform.
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TENSILE PROPERTIES OF ASPHALT Overlay GEOSYNTHETIC REINFORCEMENT
Transportation Research Record, 1998Co-Authors: C. Sprague, Sam Allen, William O. TribbettAbstract:Paving fabrics have been used for many years to retard reflective cracking and to enhance waterproofing in asphalt Overlays. More recently, higher-strength geosynthetics have been incorporated into asphalt Overlays to provide an even higher level of crack retardation and, in some cases, waterproofing. The mechanisms that lead to the enhanced performance of reinforced Overlays have been described and quantified, demonstrating that the tensile stiffness added by the reinforcement allows the crack energy to be intercepted and reoriented horizontally. Therefore, it is important to better define and more clearly specify the desired tensile stiffness and how it should be measured. A summary of Overlay reinforcement theory is presented to demonstrate the importance of reinforcement tensile properties. The results of laboratory testing of various geosynthetics used for asphalt Overlay reinforcement are presented. Three standard tests were compared, and consistency was not found among results. A commonly used wide...
Facundo Isla - One of the best experts on this subject based on the ideXlab platform.
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Mechanical response of fiber reinforced concrete Overlays over asphalt concrete substrate: Experimental results and numerical simulation
Construction and Building Materials, 2015Co-Authors: Facundo Isla, Bibiana Luccioni, Gonzalo Ruano, María Celeste Torrijos, Francisco Morea, Graciela Marta Giaccio, Raúl Luis ZerbinoAbstract:Abstract Fiber reinforced concrete Overlays are nowadays an alternative for repairing and reinforcing pavements. The contribution of concrete Overlays strongly depends on the bond with the substrate. The fibers help sewing contraction joints and eventual cracks and, in this way prevent the propagation of cracks along the substrate–Overlay interface. Therefore, the addition of fibers to the Overlay allows reducing repair thickness, increasing service life and improving pavements general performance. Some experimental tests performed for the development of a method to assess different fibers efficiency in this type of applications are presented in this paper. Substrate–Overlay composite beams are tested under flexure. The beams consist of Overlays of plain and fiber reinforced concretes, containing steel and macro-synthetic fibers, applied over an asphalt concrete substrate. The numerical simulation of the beams is also included in the paper. Fiber reinforced concrete is considered as a composite material made of a concrete matrix and fibers and its mechanical behavior is modeled with a simple homogenization approach based on modified mixture theory. The numerical simulation can accurately reproduce material characterization tests and predict the bearing capacity of the composite beams. Furthermore, other substrate/Overlay alternatives are numerically studied. The numerical results could be useful to improve the design of these intervention techniques.
Eng Keong Lua - One of the best experts on this subject based on the ideXlab platform.
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Chapter 11 – Service Overlays
P2P Networking and Applications, 2009Co-Authors: John F. Buford, Eng Keong LuaAbstract:Publisher Summary This chapter highlights service Overlays. Service orientation is growing in importance as a fundamental architecture in distributed enterprise computing. In the P2P context, an Overlay can be used by multiple applications, as opposed to a dedicated Overlay for each type of P2P application. The advantage is that a common mechanism, such as routing, naming, search, and security is shared across multiple applications. Using the P2P Overlay as a service delivery platform can also accelerate the delivery of new services. Overlays have also been used to deliver services traditionally built into the network layer. An Overlay designed to provide a network service, such as selecting an alternate routing path, multicast delivery, or session establishment is referred to as a service Overlay. In addition, the application of principles of service-oriented architectures to P2P Overlays is of growing interest. Three concepts—resource virtualization, service orientation, and devices as peers—unify the two categories of service Overlay and are described in this chapter. For network services it provides an example, such as delivering DNS records from a DHT, resilient Overlay networks, and QoS-aware Overlays. Then it discusses service discovery, replication, and load balancing in the context of service-oriented service Overlays. The chapter concludes with some examples of service composition.
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Measurement for P2P Overlays
P2P Networking and Applications, 2009Co-Authors: John F. Buford, Eng Keong LuaAbstract:This chapter provides an overview on the measurement for P2P Overlays. The P2P Overlay depends on the service characteristics of the underlying network, but in today's Internet the state of links and routers is not easily available to applications. Thus, many Overlay networks use periodic probing of the underlying network to measure network conditions. Since such measurements on the scale of a P2P Overlay can significantly load the network, techniques for reducing the probing are of interest. P2P Overlays frequently need to exploit network latency for decisions regarding locality, proximity, and topology. This chapter discusses the use of Internet coordinate systems and other techniques for estimating latency-related measurements in P2P Overlays. Internet coordinates systems, meridian, accuracy and overhead, network embedding, and so on are briefly discussed.
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Structured Overlays: Geometry and Routing
P2P Networking and Applications, 2009Co-Authors: John F. Buford, Eng Keong LuaAbstract:This chapter provides an overview on structured Overlays. A second category of Overlays, called structured Overlays, emerged to address limitations of unstructured Overlays by combining a specific geometrical structure with appropriate routing and maintenance mechanisms. Here the chapter focuses on geometry and routing. In the design of structured Overlays, the geometry of the Overlay is a key design decision. To be effective for P2P use, the geometry must meet several criteria, including: the Overlay must be fully connected for resiliency to peer failure, peers throughout the peer population must have a uniform degree to avoid load imbalance, there must be support for at least one type of distributed routing function that converges, and so on. To organize the large space of structured Overlays, one can use the following criteria: multihop versus O(1)-hop, logarithmic degree versus constant degree, and routing using prefix, Euclidean distance, and XOR metrics.
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Chapter 15 – Managed Overlays
P2P Networking and Applications, 2009Co-Authors: John F. Buford, Eng Keong LuaAbstract:Publisher Summary This chapter provides a review on managed Overlays. Physical networks are managed by their operators to assure that network services perform as expected. Although Overlays are self-organizing, experience with deployed Overlays indicates that additional management mechanisms are needed in some cases. This chapter compares the traditional network management functions with the requirements for managing large-scale Overlays and outlines a general approach for integrating an external management agent with an Overlay. In addition, we review current trends in addressing the impact of P2P traffic on ISP networks.
C. Sprague - One of the best experts on this subject based on the ideXlab platform.
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TENSILE PROPERTIES OF ASPHALT Overlay GEOSYNTHETIC REINFORCEMENT
Transportation Research Record, 1998Co-Authors: C. Sprague, Sam Allen, William O. TribbettAbstract:Paving fabrics have been used for many years to retard reflective cracking and to enhance waterproofing in asphalt Overlays. More recently, higher-strength geosynthetics have been incorporated into asphalt Overlays to provide an even higher level of crack retardation and, in some cases, waterproofing. The mechanisms that lead to the enhanced performance of reinforced Overlays have been described and quantified, demonstrating that the tensile stiffness added by the reinforcement allows the crack energy to be intercepted and reoriented horizontally. Therefore, it is important to better define and more clearly specify the desired tensile stiffness and how it should be measured. A summary of Overlay reinforcement theory is presented to demonstrate the importance of reinforcement tensile properties. The results of laboratory testing of various geosynthetics used for asphalt Overlay reinforcement are presented. Three standard tests were compared, and consistency was not found among results. A commonly used wide...
