The article considers the issues of increasing road safety in urban development in winter. The causes of snow and ice deposits and their impact on the comfort and safety of traffic, including pedestrians, are considered. A review of modern snow melting and road surface heating systems is provided, with the most effective examples of road surface heating projects being given. A comparative analysis and assessment of the effectiveness of road surface heating systems is performed, using a 1000 m2 car park as an example. Recommendations are given for the use of road surface heating systems.
Keywords: highways, hydrothermal systems, electrical systems, road surface heating
The article is devoted to the use of reinforced soils in the base of pavements of highways located in the I road-climatic zone. The features of the operating modes of reinforced foundation soils are considered, and their physical and mechanical characteristics with various combinations of mineral and polymer modifiers are determined. The authors analyze the advantages and disadvantages of using reinforced soils. The article also discusses the design and construction of roads using reinforced soils.
Keywords: highway, road pavement, foundation, soils, reinforced soils, modifiers
The article discusses the use of organic binders to modify the properties of cement soils. The scope of application of cement soils in construction practice, including the construction of highways, is considered. The influence of the use of organic binders as a complex additive that modifies the strength characteristics of cement soils has been studied. The influence of the use of complex modifiers and additives on the frost resistance and water permeability of cement soils has been determined.
Keywords: cement soil, organic binder, highway, working layer, frost resistance, modifiers
The article deals with the issues of assessing the effectiveness of the construction and operation of metal corrugated pipes. The characteristic features and difficulties of the operation of corrugated metal culverts in areas of permafrost distribution are revealed. The characteristics of the main defects of culverts are systematized. The features of thermophysical calculations of metal corrugated pipes on a frozen base are analyzed in detail. Recommendations are given on the application of the most effective technical solutions in the construction of corrugated metal culverts on permafrost soils.
Keywords: highway, culverts, metal corrugated pipes, thermal conductivity, permafrost soils
At present an important role in solving energy conservation problem is assigned to thermal pumping plants (TPP). Using processes of evaporation and condensation of easily boiling liquid circulating in the system they extract low potential heat from environmental objects and provide heat supply for buildings, constructions, greenhousee and so on. Artificial sources of low potential heat for TPP of different capacity can be, for instance, ventilation air and exhaust gases, circulating and waste water,ground. Energy efficient reasonability of TPP use in the system of water disposal for the town of Novocherkassk in Rostov region is considered. Calculations indicate that there is a technical potential to replace a boiler house operating on expensive gas fuel and emissing into the atmospere more than 850 t of carbon dioxide - greenhouse gas - with ecologically clean TPP, one of which uses heat of waste water and the other - heat of ground.
Keywords: thermal pumping plant, renewable sources, energy conservation, evaporation, condensation, waste water, ground
The article considers the essence and specifics of state regulation of local markets in the region. With respect to implementing the principles of sustainable development highlights the key tasks of state regulation in the process of formation and development of local markets, determine the forms and methods of state regulation.
Keywords: region; regional economy; sustainable development; local markets; trends
Information about authors of issue №4 (2011)
Keywords: authors