"Вестник МГСУ"

The paper considers civil engineering in retrospect. The paper presents the records of the two contracts that date back to 1837 and 1838. The contracts cover the two stages of construction of a famous church in Vozdvizhenskoe Village in the Moscow Province. These documents were stored in the Central Historic Archive, namely, in the collection of the town hall of Sergievskij Possad. These records of the two agreements in the collection of the brokers notes (or in other books of the same type) are of particular value, as the majority of authentic contracts have been lost. One of the contracts covers the organizational procedure and pre-construction works, while the other one covers the construction of the church. The first document gives the idea of environmental protection, employment of ecological technologies, and safe disposal and recycling of human biowaste in the course of dismantling of an old structure in Vozdvizhenskoe village. The second document that dates back to 1838 covers the sequence of construction works, starting from the foundation and ending with the arches, the types of building materials used, and peculiarities of stone masonry. The information recorded in the contract includes the names of the counterparties, day-to-day mode of life of seasonal workers, remuneration of labour and procedures that assure the quality of construction. This agreement makes it possible to outline the construction process that includes workers, bricklayers, the foreman, the contractor, the architect, and the customer. On the whole, both documents help us outline and assess some of the building practices of the 19th century. This issue is relevant nowadays, as our society has entered the phase of the market economy, while the experience accumulated by the past generations is of undeniable value.

The article is devoted to the preconditions of the occurrence and development of half-timbered architecture in different regions of the world. The starting point is giving account of the content of the concept of “Fachwerk”. Using the term “Fachwerk” the article refers to a type of building structure which uses three-dimensional farm inclined at different angles as the basis for carrying out wooden beams; beside, the article defines the construction materials used in construction of timber-framed buildings, and the technology of their construction. The history of the formation and development of Fachwerk is among objectives of the study of half-timbered architecture as well. The main methods of research are observation, analysis, comparison, historical methods. Some photographs of certain half-timbered buildings were used to make a reader familiar with the aesthetic impact of this kind of architecture. The oldest building of protofachwerk could be found on the territory of modern Turkey and China. Later, in the Middle Ages, half-timbered buildings appeared among the Germans, Gauls, and other Western European nations. Still preserved, half-timbered buildings date back to the 14th century. Improvement of building materials and technologies of construction, economic, religious and cultural changes and transition of Western peoples from Middle Ages to modern times played a significant role in the formation of half-timbered architecture. It is also noted that there is a direct link or correlation between the religious characteristics of a society and a form of Fachwerk corresponding to them. A special place in the article is taken by Protestantism which contributed to the progressive development of technology, including construction and thereby changed the vector of development of the Western society from traditionalism to modernity. In the 20th century Fachwerk in Europe experienced a new prosperity, thanks to its use as a stylistic foundation of Swiss-style buildings, styles, stick, hips, Jugend, Storybook, Adirondack. Regional variants of Fachwerk and its interpretations are now available in some regions of Western, Central, South and East Asia, Africa, North and South America, and Australia. In the course of the study we revealed the influence of socio-cultural factors in the half-timbered architecture in different regions of its distribution. It is concluded that Fachwerk is an indicator of predisposition of a particular culture to the progressive development.

In the article, the co-authors offer their advanced and efficient methodologies for the recycling of the rice straw, as well as the novel approaches to the ceramic brick quality improvement through the application of the rice straw as the combustible additive and through the formation of amorphous silica in the course of the rice straw combustion. The co-authors provide characteristics of the raw materials, production techniques used to manufacture ceramic bricks, and their basic properties in the article. The co-authors describe the simulated process of formation of amorphous silica. The process in question has two independent steps (or options): 1) rice straw combustion and ash formation outside the oven (in the oxidizing medium), and further application of ash as the additive in the process of burning clay mixtures; 2) adding pre-treated rice straw as the combustible additive into the clay mixture, and its further burning in compliance with the pre-set temperature mode. The findings have proven that the most rational pre-requisite of the rice straw application in the manufacturing of ceramic bricks consists in feeding milled straw into the clay mixture to be followed by molding, drying and burning. Brick samples are highly porous, and they also demonstrate sufficient compressive strength. The co-authors have also identified optimal values of rice straw and ash content in the mixtures under research.

Foamed glass is one of the most energy efficient construction materials. However, the existing technologies of foamed glass manufacture do not correspond to the principles of green construction because a special sulphate glass is used, produced from natural raw materials, and it causes emission of pollutants at all stages of the life cycle of the material. The resource and energy-saving technology for producing environmentally safe energy-efficient foam glass based on off-grade glass cullet, which is a component of solid municipal waste, has been developed, substantiated and implemented. In solving a particular problem of foam glass production, an algorithm of development of an environmentally safe building material based on or with addition of production and consumption wastes was proposed and approved. This algorithm is consistent with the principles of green construction. Subject: development of the technological scheme of manufacture and recycling of energy efficient cellular material corresponding to the requirements of ecological safety at all stages of its life cycle; proposition of an algorithm that solves the general problem of development of environmentally friendly construction materials and conforms to the principles of green construction. Materials and methods: analysis of existing technical solutions for manufacture and recycling of foam glass from the viewpoint of green construction principles and proposition of alternative environmentally friendly solutions. Results: as a result of elimination of the drawbacks inherent in the existing foam glass at all stages of its life cycle, technical solutions that ensure environmental safety of the material were substantiated. Conclusions: the results can be used for development of construction materials corresponding to the principles of green construction.

Crude oil and gas fields are located in remote areas known for their severe geological and climatic conditions that are aggravated by the presence of the paleocrystic frozen rock. Borehole drilling causes generation of the substantial amount of drilling waste. The sludge weighs millions of tons. Any rock is to remain frozen at any drilling site in the Yamal peninsula. Semifluid drilling waste occupies extensive areas around drilling sites; they prevent development of the surface infrastructure, they interfere with the work of drilling technicians and contribute to hazardous working conditions, they are a challenge to the local ecology. The above factors produce a negative impact on the environment and prevent sustainable development of the region. For example, disposal of drilling waste at condensed gas fields operated in the Yamal peninsula represents a substantial problem. Drilling waste contains drilling fluid used in the process of borehole drilling. It was discovered in the course of the preliminary research that drilling fluids were composite suspensions that contained bentonite, heavy spar, caustic soda, dilutants, and polymers. It was found out that the sludge was composed of silica, calcite, dolomite, aragonite, magnesite, some feldspars, heavy spar, gypsum and anhydrite, micas, hydromicas, clay minerals. Projections provided in the paper say that pre-neutralized sludge may be used in the manufacturing of building materials, such as bricks, claydite, small-size building units, etc. The authors argue that further research of the sludge elements and microstructure, as well as its chemical, mineral, granulometric and X-ray phase analyses need to be performed.

Basing on life cycle analysis of building materials produced of waste products the authors defined the formation stages of environmental risks of adverse impacts on the environment. The studies have revealed that one of the main environmental risks is the occurrence of secondary emission of pollutants from building materials produced of waste products when used by the end-user, which is not taken into account by the existing regulatory documents defining the environmental safety of construction materials. The questions of prevention of the possible negative impact of the construction materials based on or with addition of production waste while their use on the environment and population as a result of a number of natural and anthropogenic factors, which can lead to negative ecological effects, which are difficult to forecast, are not regulated enough. In the present conditions of the absence of regulatory framework of their ecological safety the wide use of production waste for obtaining construction materials without account for the possible ecological risks may lead to technogenic burden exceeding the acceptable level.The authors defined the main ways to reduce the environmental risks when using the resource potential of waste for the production of building materials by reducing the emissions of these pollutants while reducing their permeability.

Subject of research: the main heat loss occurs through the building fence. In the paper, the object of research is enclosing structures with different thermal conductivity. The problem of moisture accumulation in the wall is quite relevant. One of the main problems in construction is saving on building materials and improper design of building envelope. This in turn leads to a violation of the heat and humidity regime in the wall. This paper presents one of the methods to address this issue. Purpose: description of heat and humidity conditions in the wall fence of high-rise buildings. It is also necessary to analyze the relationship between the thermophysical characteristics. Materials and methods: the temperature distribution in the layers will be analyzed on the basis of the structure consisting of 10 layers; the layer thickness is 0.05 m. Materials with different thermal conductivity were used. Each subsequent layer differed in thermal conductivity from the previous one by 0.01. Next, these layers are mixed. The calculation of the humidity regime includes finding the temperature distribution along the thickness of the fence at a given temperature of the outside air. The quality factor of the temperature distribution is the maximum average temperature. This research are conducted in the field of energy efficiency. Results: the higher the average wall temperature, the lower the air temperature differs from the wall temperature. In addition, the higher the average temperature of the wall, the drier the surface inside the wall. However, moisture accumulates on the surface inside the room. The working capacity of multilayer enclosing structures is determined by the temperature distribution and distribution of moisture in the layers. Conclusions: moisture movement through the fence is due to the difference in the partial pressure of water vapor contained in the indoor and outdoor air. A layer with minimal thermal conductivity should be located on the outer surface of the wall in a multi-storey building. The maximum change in the amplitude of temperature fluctuations is observed in the layer adjacent to the surface by periodic thermal effects. It is also taken into account that the process of heat absorption has a great influence on the temperature change in the thickness of the wall fence to the greatest extent within the layer of sharp fluctuations (outer layer). The Central part of the wall (bearing layer) will be the driest. These calculations are satisfied with the design of the ventilated facade.