About the number
CONSTRUCTION BIOCOMPOSITES USING WOODWORKING WASTE.
PART 2 (EXPERIMENTAL STUDIES
BIOFERMENTATION OF WOOD AGGREGATE)
Authors: V.V. Belov
Abstract: The methods of biofermentation of wood aggregate for the purpose of its use as a filler for light concrete and other building materials have been studied. It is indicated that such processing of wood raw materials can make it possible to obtain building materials that meet the requirements of the standard (even on the basis of widespread woodworking waste – sawdust). Bioremediation of sawdust according to the developed method significantly (twice or more) reduces the sugar content in them, which contributes to obtaining sawdust concrete samples with a density corresponding to the density of light concrete and with sufficient compressive strength. It is noted that experimental samples of biologically activated wood filler have been obtained, and its basic physico-chemical properties have been determined.
Keywords: woodworking waste, wood aggregate, biofermentation, properties.
ASH CEMENT COMPOSITIONS
Authors: V.B. Petropavlovskaya, T.B. Novichenkova, Kh.A. Mikaelyan, K.S. Petropavlovskii
Abstract: The results of studies of the influence of the isolated aluminosilicate component of the ash and slag waste of hydraulic removal on the properties of cement mixtures are presented. During the analysis of the results of the study of water demand and the setting time of these mixtures with the inclusion of an aluminosilicate additive, it was revealed that the introduction of a highly dispersed ash component affects the properties of raw mixtures based on Portland cement. The results obtained demonstrate that the use of an additive entails the regulation of the properties of the binder by introducing additional components that make it possible to optimize the technological properties of the resulting mixtures.
Keywords: portland cement, ash and slag waste, flotation, aluminosilicate additive, water demand, setting time.
ABOUT SOME PROBLEMS OF PASSENGER PLATFORM OPERATION
Authors: Yu.Yu. Kuryatnikov
Abstract: The analysis of problems arising at the stage of construction or reconstruction or during the operation of railway platforms and leading to a reduction in their service life is carried out. The ways of solving these problems are proposed, namely, it is recommended to use modern factory construction products with an anti-slip effect.
Keywords: passenger platform, anti-slip effect, deicing reagents, hydrophobizer.
HIGH-TECH WALL AND VENTILATION UNITS
WITH A SUPPORTING TUBULAR FRAME
Authors: V.I. Trofimov
Abstract: The article deals with the issue of increasing the efficiency of manufacturing and working under load of lightweight concrete products, taking into account the use of void formers of various shapes and the rheological state of the mixture. The methods of obtaining multi-hollow concrete products as wall products are considered and a new method of forming their multi-hollow structure based on the use of tubular frames and the technology of their manufacture is proposed.
Keywords: concrete, multi-hollow concrete products, tubular frame, rheological condition.
INFLUENCE OF METEOROLOGICAL CONDITIONS
UPON THE ELECTRICAL CONDUCTIVITY
OF THE PRECIPITATION IN TVER DURING 2016–2022 YEARS
Authors: F.V. Kachanovsky
Abstract: Analysis had made of the precipitation′s electrical conductivity (atmospheric precipitation had fallen in Tver in 1916–2022 years) and factors of the influence on it. Time series models of the electrical conductivity were examined. Сubic model has considered as adequate.
Keywords: сonductivity, acidity, acid rain, precipitation, model, time series, trend, cycle component, seasonal component, correlation.
MATHEMATICAL EVIDENCE OF THE LAWS
OF QUANTUM THERMAL RADIATION OF GAS VOLUMES. PART I.
LAWS OF QUANTUM THERMAL RADIATION
OF CYLINDRICAL GAS VOLUMES
Authors: A.N. Makarov
Abstract: The description of the first law of quantum thermal radiation of ionized and non-ionized gas volumes of any shape and size is given. A mathematical description of the derivation of the second-fifth laws of quantum thermal radiation of cylindrical gas volumes is given. It is indicated that cylindrical gas volumes can simulate the thermal radiation of electric arcs of electric arc steelmaking, flare heating furnaces, furnaces of steam boilers of power plants, flares of combustion chambers of gas turbine plants of power plants, gas turbine engines.
Keywords: quantum, laws, thermal radiation, gas volumes, torch, electric arc, furnaces, furnaces, combustion chambers.
THE PROBLEM OF ICE FORMATION ON OVERHEAD POWER LINES WIRES
AND METHODS OF COMBATING IT
Authors: D.A. Nikulenko, L.S. Araratyan, A.V. Krupnov
Abstract: The analysis of the factors influencing the occurrence of icy deposits is carried out, and the features of icy formations on power lines are revealed. The consequences of accidents that occurred as a result of the formation of ice on the wires are given. Devices, systems, and basic measures designed to prevent ice formation are considered. The methods of prevention and control of ice are described.
Keywords: wires, overhead power lines, power line support, ice, frost, icing of wires, methods of de-icing.
ON THE CENTERS OF SYMMETRY OF A CONVEX SPATIAL BODY
Authors: Al.A. Shum, A.M. Vetoshkin
Abstract: The concept of the center of n-symmetry of a spatial body introduced by the authors earlier is considered. It is indicated that special cases of this general concept are the center of s-symmetry (the center of 0-symmetry) and the center of c-symmetry (the center of 1-symmetry). The previously established criterion for the coincidence of the center of s-symmetry of a convex spatial body with the origin of coordinates is transferred to the general case of n-symmetry.
Keywords: symmetry, c-symmetry, s-symmetry, n-symmetry, center of symmetry, density function, convex body, mass, center of mass, electric bus.
FEATURES OF THE USE OF ADHESIVE ADDITIVES «AMDOR»
FOR THE MODIFICATION OF BITUMEN BINDERS
Authors: M.E. Bokova, D.V. Danilov, P.A. Duzhiy, D.Yu. Nebratenko
Abstract: It is indicated that one of the reasons for the formation of defects in the upper layers of the pavement may be their insufficient water and frost resistance. It is noted that this disadvantage is due to the poor adhesion of the bitumen binder to stone materials and most often adhesive additives are used to solve this problem, affecting the surface interaction of the binder with a solid substrate at the micro level. The influence of several additives of the AMDOR trademark on the properties of bitumen binders is considered. It is concluded that the results obtained reflect the effect of the selected adhesive additives on the physical properties of the modified binder immediately after modification, as well as after the short-term aging process by RTFOT.
Keywords: adhesive additives, «AMDOR-9», «AMDOR-10», «AMDOR-20T», polymer-bitumen binders.
INJECTABLE POLYURETHANE COMPOUNDS
FOR INDUSTRIAL WATERPROOFING: CLASSIFICATION TABLE
OF SUBSTITUTE MATERIALS IN CONDITIONS OF IMPORT SUBSTITUTION
Authors: S.A. Kulkov, A.V. Savich
Abstract: The article is devoted to polyurethane injection compounds used for waterproofing of underground structures. Based on the practical experience of contractors, proposals are given for compiling a table of substitute materials to ensure their interchangeability in design solutions.
Keywords: injection compounds, resin injection, sealing, polyurethane grouts, waterproofing, polyurethane, polyurethane resins, hydroactive resins, import substitution.