The Experts below are selected from a list of 116568 Experts worldwide ranked by ideXlab platform

Laurent Calvez - One of the best experts on this subject based on the ideXlab platform.

Magdy Abdelrahman - One of the best experts on this subject based on the ideXlab platform.

  • Enhancing the crumb rubber modified asphalt’s storage stability through the control of its Internal Network structure
    International Journal of Pavement Research and Technology, 2018
    Co-Authors: Mohyeldin Ragab, Magdy Abdelrahman
    Abstract:

    Abstract The current research investigated the effect of the Internal Network structure developed in the crumb rubber modified asphalt (CRMA) on its storage stability. The authors investigated the influence of asphalt-crumb rubber modifier (CRM) interaction parameters (interaction time, interaction speed, and interaction temperature) on the development of the Internal Network structure in CRMA. The authors found that the existence of three dimensional (3D) Network structures in the CRMA enhanced its storage stability. Fourier Transform Infrared (FTIR) Spectroscopy was utilized to determine the nature of CRM components responsible for the development of 3D Network structure in the liquid phase of CRMA. This was achieved by monitoring the changes of the IR distinctive peaks in the CRMA liquid phase. Dissolution tests and thermo gravimetric analysis (TGA) were carried out on the extracted CRM after interaction with asphalt to determine the role of CRM dissolved amounts and released components on the development of 3D Network structure in CRMA. The asphalt-CRM interaction parameters were found to be essential to induce the formation of the 3D Network structure within the liquid phase of the CRMA through controlling the swelling, dissolution and release of CRM components into the asphalt liquid phase. The existence of 3D Network structure in the CRMA had determinant impact on the enhancement of its storage stability.

  • Effects of Interaction Conditions on Internal Network Structure of Crumb Rubber-Modified Asphalts
    Transportation Research Record, 2014
    Co-Authors: Mohyeldin Ragab, Magdy Abdelrahman
    Abstract:

    Investigation of the effect of interaction conditions on the development of the Internal Network structure of crumb rubber-modified asphalt (CRMA) was carried out. Enhancements in the CRMA physical properties, such as stiffness, expressed in the complex modulus (G*), and elasticity, expressed in the phase angle (δ), as a result of the development of three-dimensional (3-D) entangled Network structure were achieved. These results came from controlling the interaction conditions of CRMA synthesis to regulate the crumb rubber-modified (CRM) components that were responsible for the formation of the 3-D entangled Network structure. Dissolution tests and thermogravimetric analysis (TGA) were performed on the extracted CRM particles after interaction with asphalt. A Fourier transform infrared (FTIR) spectroscopy investigation was performed on the liquid phase asphalt after separation of CRM. FTIR was used to investigate the state of the released CRM components, previously calculated by TGA, which were responsibl...

  • Performance Enhancement of Crumb Rubber-Modified Asphalts Through Control of the Developed Internal Network Structure
    Transportation Research Record, 2013
    Co-Authors: Mohyeldin Ragab, Magdy Abdelrahman, Amir Ghavibazoo
    Abstract:

    Control of the Internal Network structure of crumb rubber-modified asphalt (CRMA) was investigated for its effect on property development in the study presented in this paper. The investigation included evaluation by rheological and interrupted shear tests. Rheological testing involved the monitoring of the changes of the produced complex modulus (G*) and phase angle (δ) for CRMA. In the interrupted shear tests, the shear stress profile for the produced CRMA was investigated. It was found that triggering the critical conditions of the combined interaction of speed, temperature, and time was essential to inducing the formation of the three-dimensional Network structure within CRMA. Such triggering conditions played an important role in the swelling, dissolution, and release of crumb rubber modifier components into the asphalt liquid phase. Gel permeation chromatography was used to characterize the nature of modifications that led to the occurrence of a three-dimensional Network structure within the produce...

Xianghua Zhang - One of the best experts on this subject based on the ideXlab platform.

Mohyeldin Ragab - One of the best experts on this subject based on the ideXlab platform.

  • Enhancing the crumb rubber modified asphalt’s storage stability through the control of its Internal Network structure
    International Journal of Pavement Research and Technology, 2018
    Co-Authors: Mohyeldin Ragab, Magdy Abdelrahman
    Abstract:

    Abstract The current research investigated the effect of the Internal Network structure developed in the crumb rubber modified asphalt (CRMA) on its storage stability. The authors investigated the influence of asphalt-crumb rubber modifier (CRM) interaction parameters (interaction time, interaction speed, and interaction temperature) on the development of the Internal Network structure in CRMA. The authors found that the existence of three dimensional (3D) Network structures in the CRMA enhanced its storage stability. Fourier Transform Infrared (FTIR) Spectroscopy was utilized to determine the nature of CRM components responsible for the development of 3D Network structure in the liquid phase of CRMA. This was achieved by monitoring the changes of the IR distinctive peaks in the CRMA liquid phase. Dissolution tests and thermo gravimetric analysis (TGA) were carried out on the extracted CRM after interaction with asphalt to determine the role of CRM dissolved amounts and released components on the development of 3D Network structure in CRMA. The asphalt-CRM interaction parameters were found to be essential to induce the formation of the 3D Network structure within the liquid phase of the CRMA through controlling the swelling, dissolution and release of CRM components into the asphalt liquid phase. The existence of 3D Network structure in the CRMA had determinant impact on the enhancement of its storage stability.

  • Effects of Interaction Conditions on Internal Network Structure of Crumb Rubber-Modified Asphalts
    Transportation Research Record, 2014
    Co-Authors: Mohyeldin Ragab, Magdy Abdelrahman
    Abstract:

    Investigation of the effect of interaction conditions on the development of the Internal Network structure of crumb rubber-modified asphalt (CRMA) was carried out. Enhancements in the CRMA physical properties, such as stiffness, expressed in the complex modulus (G*), and elasticity, expressed in the phase angle (δ), as a result of the development of three-dimensional (3-D) entangled Network structure were achieved. These results came from controlling the interaction conditions of CRMA synthesis to regulate the crumb rubber-modified (CRM) components that were responsible for the formation of the 3-D entangled Network structure. Dissolution tests and thermogravimetric analysis (TGA) were performed on the extracted CRM particles after interaction with asphalt. A Fourier transform infrared (FTIR) spectroscopy investigation was performed on the liquid phase asphalt after separation of CRM. FTIR was used to investigate the state of the released CRM components, previously calculated by TGA, which were responsibl...

  • Performance Enhancement of Crumb Rubber-Modified Asphalts Through Control of the Developed Internal Network Structure
    Transportation Research Record, 2013
    Co-Authors: Mohyeldin Ragab, Magdy Abdelrahman, Amir Ghavibazoo
    Abstract:

    Control of the Internal Network structure of crumb rubber-modified asphalt (CRMA) was investigated for its effect on property development in the study presented in this paper. The investigation included evaluation by rheological and interrupted shear tests. Rheological testing involved the monitoring of the changes of the produced complex modulus (G*) and phase angle (δ) for CRMA. In the interrupted shear tests, the shear stress profile for the produced CRMA was investigated. It was found that triggering the critical conditions of the combined interaction of speed, temperature, and time was essential to inducing the formation of the three-dimensional Network structure within CRMA. Such triggering conditions played an important role in the swelling, dissolution, and release of crumb rubber modifier components into the asphalt liquid phase. Gel permeation chromatography was used to characterize the nature of modifications that led to the occurrence of a three-dimensional Network structure within the produce...

Stathes Hadjiefthymiades - One of the best experts on this subject based on the ideXlab platform.

  • ISCC - A topology inference algorithm for wireless sensor Networks
    2012 IEEE Symposium on Computers and Communications (ISCC), 2012
    Co-Authors: Theofanis Kontos, George Alyfantis, Yiannis Angelopoulos, Stathes Hadjiefthymiades
    Abstract:

    The use of Network tomography has been proposed as a means to infer Network topology in wireline Networks. In what regards wireless sensor Networks, the methods suggested for topology discovery make explicit use of neighborhood information sent by Internal Network nodes. We propose an algorithm for inferring the tree topology of a wireless sensor Network based on loss measurements collected at the sink of the Network. The proposed method does not rely on the active cooperation of Internal Network nodes, but is capable of inferring the sought topology, only through the received sensor readings (passive method), without undertaking energy-intensive tasks within the Network.