Vibrational spectroscopy of trans and cis deuterated formic acid (HCOOD): Anharmonic calculations and experiments in argon and neon matrices

Non Peer reviewe

Prospects of the application of curable decontamination solutions in problems of impact improving of nuclear power plants

The technology of power generation from nuclear power is accompanied by the formation of radioactive waste, which has significant potential environmental hazards. This paper proposes new methods of decontamination of NPP equipment with fluids that immediately after use can be converted into an environmentally safe condition - curing methods of decontamination solutions. A characteristic feature of curable solutions decontamination methods is that the composition of the decontamination solution, and also processes in the solution during deactivation, affect the subsequent transfer of this solution to a solid state, as well as on the properties of the matrix, which will be "sealed" removed radionuclides. The main factor determining the course of the process of decontamination methods can be divided into contact, acid-abrasive, ultrasound and combined. Concerning the main component of the decontamination solution (slurry) methods can be subdivided into solutions with hydraulic binders, clay slurry (with conventional clay and a clay with a high alumina content) suspension of diatomite and combined. The means of transfer of the solutions used in the solid state methods are divided into "self-curing" heat treatable and cemented. Application of methods of the curing solution allows us to reduce the number of operations to deactivate air conditioning that provides economic benefits and allows us to create a whole class of portable equipment and to reduce the amount ongoing to dump 4-6 times in comparison with cemented. © 2014 WIT Press.International Journal of Safety and Security Engineering;International Journal of Sustainable Development and Planning;WIT Transactions on Ecology and the Environmen

Nanoscale investigation of polymer cement concretes by small angle neutron scattering

An analysis of dense cements, such as polymer cement concrete, is made to produce original innovative components for different types of constructing materials. These materials present good functional properties (ageing resistance, crack formation resistance, hardness, and stability of mechanical modules) and can be used for various applications. In this paper, experimental tests on Portland cement with added γ-Al 2 O 3 and redispersible dry polymer performed using small angle neutron scattering are reported. The objective of the investigation was to assess the key parameters of the material (e.g., porosity, fractal dimensions, and size distribution) at the nanoscale level as well as to obtain useful structural information for expanding the possibility of applications. The results obtained can contribute to the optimisation of the consistency of the material, the design of operating conditions of elements of structures and facilities, and the design of the procedures that support ecological criteria and enhance quality and safety levels. © 2017 Walter de Gruyter GmbH, Berlin/Boston

RECYCLED CONCRETE PRODUCTS AS PERSPECTIVE RAW MATERIALS FOR CONSTRUCTION INDUSTRY ENTERPRICES

The characteristic of granular materials obtained as a result of concrete wastes crushing are presented in this paper. It was established that coarse aggregates made of crushed concrete stone are characterized both poor quality and limited application. Fine aggregates from crushed concrete to substitute natural quartz sand in the technology of dry building mixes and mortars might be more demanded in future.Представлена характеристика зернистых материалов, полученных в результате дробления бетонного лома. Установлено, что крупный заполнитель из дробленого бетона характеризуется низким качеством и имеет ограниченную сферу применения. Более востребованным может быть мелкий заполнитель из дробленого бетона для замены природного кварцевого песка в технологии сухих строительных смесей и растворов

The initial indicators influence of concrete crap on the recycled aggregate properties

The characteristic of granular materials obtained as a result of concrete wastes crushing and sieving are presented in this paper. It was established that with reducing strength of initial concretes from 40 to 30 MPa dust content in new product increases by 20 %, nevertheless, difference between true and bulk densities of sands with equal size does not exceed 3 %.Представлена характеристика зернистых материалов,полученных в результате дробления и рассева бетонного лома разной прочности. Установлено, что с уменьшением прочностных показателей исходного лома с 40 до 30 МПа на 20 % увеличивается количество пылевидной фракции в продуктах его дробления; при этом разница в истинной и насыпной плотности песков одинаковой крупности незначительна и составляет не более 3 %

The Case of Langerhans Cell Histiocytosis (Abt-Letterer-Siwe Disease) in Twin Girls

Abt-Letterer-Siwe disease is a form of Langerhans cell histiocytosis and occurs in 2–10 cases per 1 million of the child population per year. The Russian and foreign literature provide descriptions of this disease in children of different ages. Family cases of this pathology are described in a small number. The chapter presents a rare clinical observation of the Abt-Letterer-Siwe disease in twin girls

Sand made from recycled concrete is perspective raw material for dry buildingmixes

The basic properties of sands from sifting of crushed concrete scraps are studied in comparison with sands from sifting crushed granite, which is traditionally used for floor screed production. It is established that the replacement of granite fine aggregate with sand from the screening of crushing concrete scrap leads to a decrease in the quality indices of solidified solutions by 10-30%. The optimal grain particles size of sands from sifting of crushed concrete scraps was elaborated for the properties improvement of the final material. The composition of dry building flooring sealing mix B12,5 strength class for leveling was developed on the basis of the composition of sands from crushed concrete in correspondence with the requirements of standards. © Published under licence by IOP Publishing Ltd

Fly Ash-based Geopolymer Binders: Perspective Materials for Sustainable Building

The possibility of obtaining a geopolymer binder on the basis of fly ash of the Reft thermal power station and fine-grained concrete on its basis is investigated. It is shown that the chemical-mineral composition and properties of this fly ash allow it to be used as an aluminosilicate component without additional grinding and introduction of mineral additives. In this case, the alkaline activator is an industrial sodium liquid glass diluted to a density of 1200 kg/m3. The dependences of the strength of geopolymer binder and fine-grained concrete on its basis on the conditions of hardening, aggregate consumption and the sequence of mixing of components are established. Based on the fly-ash geopolimer and the screenings crushing granite dropout picked up the fine-grained concrete class B35. © 2019 Published under licence by IOP Publishing Ltd