The Experts below are selected from a list of 612483 Experts worldwide ranked by ideXlab platform
Pravat Karki - One of the best experts on this subject based on the ideXlab platform.
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material specific effects of hydrated lime on the properties and Performance Behavior of asphalt mixtures and asphaltic pavements
Construction and Building Materials, 2010Co-Authors: Francisco Thiago Sacramento Aragao, Pravat KarkiAbstract:Abstract This study evaluates hydrated lime-treated hot-mix asphalt (HMA) mixtures through various laboratory tests, including the dynamic modulus test and Performance tests to characterize permanent deformation and fatigue damage resistance both in displacement-controlled and force-controlled modes. Two different asphalt mixtures — the asphalt concrete mixture and the fine aggregate asphalt matrix mixture — which differ only in the amount of additional hydrated lime (0.5–3.0%), are tested. Test results demonstrate material-specific damage characteristics of hydrated lime and the existence of a more appropriate amount of hydrated lime to be added to the HMA mixtures than the current typical application rate such as the addition of 1.0% lime to dry or pre-moistened aggregates. In addition, the newly released Mechanistic-Empirical Pavement Design Guide (MEPDG) is used for predicting pavement Performance related to hydrated lime content. The MEPDG analysis results show that damage prediction models implemented in the current MEPDG are limited to accurately predicting material-specific damage characteristics. Mechanistic models that consider material-specific crack phenomenon and fracture Behavior should be pursued.
Julie E Nodes - One of the best experts on this subject based on the ideXlab platform.
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contact based analysis of asphalt pavement with the effect of aggregate angularity
Mechanics of Materials, 2000Co-Authors: Han Zhu, Julie E NodesAbstract:Abstract Relating the Performance Behavior of asphalt pavement with its design parameters may provide the insight information of how to control and improve the quality of asphalt pavement. The relation must be developed in a functional form so the effect of design parameters on the overall stress–strain response of asphalt pavement then can be quantified based on a single-variable perturbation. This article will show that using the contact based mechanism may provide the means to develop the stress–strain relations with the parameters being analytically dependent on the physical and geometric properties of asphalt and aggregates. Specifically, the effect of aggregate angularity is incorporated into the overall response of asphalt pavement by using the higher order analysis of the mean-stress theory and an interpolation technique. The results presented in this article show that higher degree of aggregate angularity gives rise of stiffer response of asphalt pavement, which is consistent with the phenomenon of a better interlocking interaction for coarse aggregates.
Francisco Thiago Sacramento Aragao - One of the best experts on this subject based on the ideXlab platform.
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material specific effects of hydrated lime on the properties and Performance Behavior of asphalt mixtures and asphaltic pavements
Construction and Building Materials, 2010Co-Authors: Francisco Thiago Sacramento Aragao, Pravat KarkiAbstract:Abstract This study evaluates hydrated lime-treated hot-mix asphalt (HMA) mixtures through various laboratory tests, including the dynamic modulus test and Performance tests to characterize permanent deformation and fatigue damage resistance both in displacement-controlled and force-controlled modes. Two different asphalt mixtures — the asphalt concrete mixture and the fine aggregate asphalt matrix mixture — which differ only in the amount of additional hydrated lime (0.5–3.0%), are tested. Test results demonstrate material-specific damage characteristics of hydrated lime and the existence of a more appropriate amount of hydrated lime to be added to the HMA mixtures than the current typical application rate such as the addition of 1.0% lime to dry or pre-moistened aggregates. In addition, the newly released Mechanistic-Empirical Pavement Design Guide (MEPDG) is used for predicting pavement Performance related to hydrated lime content. The MEPDG analysis results show that damage prediction models implemented in the current MEPDG are limited to accurately predicting material-specific damage characteristics. Mechanistic models that consider material-specific crack phenomenon and fracture Behavior should be pursued.
David Lopezperez - One of the best experts on this subject based on the ideXlab platform.
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Performance impact of base station antenna heights in dense cellular networks
IEEE Transactions on Wireless Communications, 2017Co-Authors: Ming Ding, David LopezperezAbstract:In this paper, we present a new and significant theoretical discovery. If the absolute height difference between base station (BS) antenna and user equipment (UE) antenna is larger than zero, then the network Performance in terms of both the coverage probability and the area spectral efficiency will continuously decrease toward zero as the BS density increases in ultra-dense networks (UDNs). Such findings are completely different from the conclusions in the existing works, both quantitatively and qualitatively. In particular, this Performance Behavior has a tremendous impact on the deployment of the 5th-generation UDNs. Network operators may invest large amounts of money in deploying more network infrastructure only to obtain even less network capacity. This paper’s results reveal that one way to address this issue is to lower the BS antenna height to the UE antenna height. However, this requires a revolutionized approach of the BS architecture and deployment, which is also explored in this paper.
Ming Ding - One of the best experts on this subject based on the ideXlab platform.
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Performance impact of base station antenna heights in dense cellular networks
IEEE Transactions on Wireless Communications, 2017Co-Authors: Ming Ding, David LopezperezAbstract:In this paper, we present a new and significant theoretical discovery. If the absolute height difference between base station (BS) antenna and user equipment (UE) antenna is larger than zero, then the network Performance in terms of both the coverage probability and the area spectral efficiency will continuously decrease toward zero as the BS density increases in ultra-dense networks (UDNs). Such findings are completely different from the conclusions in the existing works, both quantitatively and qualitatively. In particular, this Performance Behavior has a tremendous impact on the deployment of the 5th-generation UDNs. Network operators may invest large amounts of money in deploying more network infrastructure only to obtain even less network capacity. This paper’s results reveal that one way to address this issue is to lower the BS antenna height to the UE antenna height. However, this requires a revolutionized approach of the BS architecture and deployment, which is also explored in this paper.
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please lower small cell antenna heights in 5g
Global Communications Conference, 2016Co-Authors: Ming Ding, David Lopez PerezAbstract:In this paper, we present a new and significant theoretical discovery. If the absolute height difference between base station (BS) antenna and user equipment (UE) antenna is larger than zero, then the network capacity Performance in terms of the area spectral efficiency (ASE) will continuously decrease as the BS density increases for ultra-dense (UD) small cell networks (SCNs). This Performance Behavior has a tremendous impact on the deployment of UD SCNs in the 5th- generation (5G) era. Network operators may invest large amounts of money in deploying more network infrastructure to only obtain an even worse network Performance. Our study results reveal that it is a must to lower the SCN BS antenna height to the UE antenna height to fully achieve the capacity gains of UD SCNs in 5G. However, this requires a revolutionized approach of BS architecture and deployment, which is explored in this paper too.
