The Experts below are selected from a list of 33 Experts worldwide ranked by ideXlab platform

W.e. Lee - One of the best experts on this subject based on the ideXlab platform.

  • Immobilisation of Radioactive Wastes in Bitumen
    An Introduction to Nuclear Waste Immobilisation, 2014
    Co-Authors: Michael I. Ojovan, W.e. Lee
    Abstract:

    This chapter gives an excellent account of bituminization process used for the immobilization of radioactive wastes. In the bituminization process, radioactive wastes are embedded in Molten Bitumen and physically encapsulated when the Bitumen cools. It combines heated Bitumen and a concentrate of the waste material in either a heated thin film evaporator or screw extruder, which mix the Bitumen and waste. It is particularly suitable for water-soluble radioactive wastes, such as bottom residues from evaporation treatment and spent organic ion exchangers. Immobilization of radioactive wastes via bituminization is carried out as a batch or continuous process, which are briefly discussed in this review. This discussion concludes with the comparison of Bitumen and cement used for immobilization process, providing the advantages of Bitumen over cement for the process.

  • Chapter 16 – Immobilisation of Radioactive Wastes in Bitumen
    An Introduction to Nuclear Waste Immobilisation, 2005
    Co-Authors: Michael I. Ojovan, W.e. Lee
    Abstract:

    Publisher Summary This chapter gives an excellent account of bituminization process used for the immobilization of radioactive wastes. In the bituminization process, radioactive wastes are embedded in Molten Bitumen and physically encapsulated when the Bitumen cools. It combines heated Bitumen and a concentrate of the waste material in either a heated thin film evaporator or screw extruder, which mix the Bitumen and waste. It is particularly suitable for water-soluble radioactive wastes, such as bottom residues from evaporation treatment and spent organic ion exchangers. Immobilization of radioactive wastes via bituminization is carried out as a batch or continuous process, which are briefly discussed in this review. This discussion concludes with the comparison of Bitumen and cement used for immobilization process, providing the advantages of Bitumen over cement for the process.

Michael I. Ojovan - One of the best experts on this subject based on the ideXlab platform.

  • Immobilisation of Radioactive Wastes in Bitumen
    An Introduction to Nuclear Waste Immobilisation, 2014
    Co-Authors: Michael I. Ojovan, W.e. Lee
    Abstract:

    This chapter gives an excellent account of bituminization process used for the immobilization of radioactive wastes. In the bituminization process, radioactive wastes are embedded in Molten Bitumen and physically encapsulated when the Bitumen cools. It combines heated Bitumen and a concentrate of the waste material in either a heated thin film evaporator or screw extruder, which mix the Bitumen and waste. It is particularly suitable for water-soluble radioactive wastes, such as bottom residues from evaporation treatment and spent organic ion exchangers. Immobilization of radioactive wastes via bituminization is carried out as a batch or continuous process, which are briefly discussed in this review. This discussion concludes with the comparison of Bitumen and cement used for immobilization process, providing the advantages of Bitumen over cement for the process.

  • Chapter 16 – Immobilisation of Radioactive Wastes in Bitumen
    An Introduction to Nuclear Waste Immobilisation, 2005
    Co-Authors: Michael I. Ojovan, W.e. Lee
    Abstract:

    Publisher Summary This chapter gives an excellent account of bituminization process used for the immobilization of radioactive wastes. In the bituminization process, radioactive wastes are embedded in Molten Bitumen and physically encapsulated when the Bitumen cools. It combines heated Bitumen and a concentrate of the waste material in either a heated thin film evaporator or screw extruder, which mix the Bitumen and waste. It is particularly suitable for water-soluble radioactive wastes, such as bottom residues from evaporation treatment and spent organic ion exchangers. Immobilization of radioactive wastes via bituminization is carried out as a batch or continuous process, which are briefly discussed in this review. This discussion concludes with the comparison of Bitumen and cement used for immobilization process, providing the advantages of Bitumen over cement for the process.

A A Yousefi - One of the best experts on this subject based on the ideXlab platform.

  • PHASE-DESTABILIZATION MECHANISM OF POLYMER-MODIFIED BitumenS IN QUIESCENT ANNEALING
    2009
    Co-Authors: A A Yousefi
    Abstract:

    itumen as a binder in coating and insulating materials is modified with polymers to improve its performance in service conditions. Almost all polymers are incompatible with Bitumen, and at high temperatures due to relatively very low viscosity of the Bitumen phase, are separated from it. These lead to a considerable limitation in the use and handling of polymer-modified Bitumens. An understanding of the mechanisms of phase separation of these incompatible mixtures help to improve methods of transportation and handling of polymer-modified Bitumens. According to direct observations of the behavior of polyethylene particles in medium of Molten Bitumen confirm the indirect conclusion already made by others, (coalescence based phase separation) and reject any possibility of occurring Ostwald ripening. This conclusion can also generalized to viscoelastic incompatible polymer blends. Prog. Color Colorants Coat. 2(2009), 53-59 . © Institute for Color Science and Technology.

N Rahul - One of the best experts on this subject based on the ideXlab platform.

  • Re-use of Recycled Materials in Construction of Flexible Pavements by using Polymers
    International Journal of Research, 2017
    Co-Authors: V. Manikanta, M. Arun Kumar, A. Vikranth Kumar, N Rahul
    Abstract:

    Bitumen, the sticky, gooey black stuff you sometimes see oozing out of hot road surfaces, is a valuable binding agent used in roads. What we do is collect old materials containing Bitumen, most of this material comes from roads. Then, we shred it, heat it, drain off the Molten Bitumen, and sieve away all contaminants like glass fibers, wood and stones. We then mix the recycled Bitumen with just a little bit of virgin Bitumen and use the mixture to produce new roads of the same quality It was quite difficult to control the exact temperature of the melting process. Too high and the Bitumen is separated into other chemicals. To low and it does not seep out of the solid materials.  We also had a hard time sieving it since it is really viscous and sticky. But we resolved all that issue and the recycling plant has been in operation since 2008. It is mostly a matter of money. And that leads to three possible solutions.  First, our recycling process could be subsidized. This is attractive from our point of view.  Second, recycling bituminous materials could be made compulsory. This would probably work, but then you need a controlling system and inspectors. That is expensive. So, probably, the taxpayers would have to come up with the funding.  Third solution, landfilling and burning Bitumen in waste-to-energy plants could be taxed. Governments would undoubtedly like that, so policy makers will probably prefer this solution. But sadly it will make the relatively green energy from these plants more expensive.In recent years, applications of plastic wastes have been considered in road construction with great interest in many developing countries. The use of these materials in road making is based on technical, economic, and ecological criteria.

Motahareh Mohammadi Roodbari - One of the best experts on this subject based on the ideXlab platform.

  • Morphology, Microstructure and Physico-Mechanical Properties of Pasargad Bitumen, Modified by Ethylene-Vinyl Acetate Copolymer (EVA) and Nanoclay
    Iran Polymer and Petrochemical Institute, 2015
    Co-Authors: Arezoo Ghaempour, Akram Tavakoli, Mirkarim Razavi Aghjeh, Motahareh Mohammadi Roodbari
    Abstract:

    Due to the characteristics such as flexibility, adhesion, hydrophobicity and low price, Bitumen is used in different construction and insulation industries. The major problem with the Bitumen material is its restricted physico-mechanical properties, mainly high temperature rutting and low temperature cracking. The aim of this work was to modify Bitumen, produced in Tabriz Pasargad Oil Company, and evaluation of its different properties to make it suitable for the weather conditions of North West of Iran. The physico-mechanical, morphological and rheological characteristics of EVA/Cloisite 15A modified Bitumen were studied.Two different feeding instructions were used in the mixing of Bitumen with modifiers.In the first method, EVA and Cloisite 15A nanoclay were simultaneously added into the Molten Bitumen and in the second method, EVA and Cloisite 15A were premixed in an internal mixer before adding the polymer/nanoclay nanocomposite into the Molten Bitumen. The results showed that addition of nanoclay and polymer into the Bitumen, led increased softening point and a decrease in the penetration of base Bitumen, in which the extent of changes, was higher for the samples prepared by masterbatch method. The rheological properties of the pre-mixed samples exhibited more improvement and these samples showed more elastic behavior. The results of optical microscopy showed that the pre-mixing of polymer and nanoclay led to a more uniform distribution of the swollen polymer phase at the base Bitumen. These samples also showed higher morphology stability than those samples prepared in single step. These effects were related to the probable localization of nanoclay at the interface of the two phases