Resistance of Binding Systems of Various Compositions to the Action of Molds

2020 ◽  
Vol 786 (11) ◽  
pp. 41-46
Author(s):  
V.V. STROKOVA ◽  
◽  
V.V. NELUBOVA ◽  
M.N. SIVALNEVA ◽  
M.D. RYKUNOVA ◽  
...  
Keyword(s):  
Aging Process ◽  
Building Materials ◽  
Environmental Safety ◽  
Fungal Resistance ◽  
Building Structures ◽  
Vital Activity ◽  
Regulatory Documents ◽  
Living Organisms ◽  
Biological Corrosion ◽  
Test Objects

The dynamic development of urbanization contributes to an increase in emissions of industrial waste, which is the cause dysfunction of the ecosystem balance and leads to the development of biological corrosion on building materials associated with the products of the vital activity of microorganisms. In this regard, it is necessary to assess the resistance of composites to predict the durability of building structures under conditions of biological influence of microorganisms. Binder systems of various compositions were studied: cementless nanostructured binders (NB) based on quartz sand and granodiorite, gypsum, Portland cement and alumina cement. The toxicity of binders was assessed by biotesting on living organisms – cladocerans Daphnia Magna – according to the criteria of the intensity of their growth and viability. As a result, the high environmental safety of NB is substantiated, and the ranking of the studied binders according to the degree of increase in their toxicity to test objects is presented. Fungal resistance was assessed by the ability of molds for growing and reproduction on the studied samples. It was found that the most active in terms of the development of binders were representatives of the genus Aspergillus, the intensity of growing of which in all variants did not decrease below 3 points. Gypsum and NB were especially vulnerable, where the degree of fouling repeatedly reached 5 points. Even the initially biostable cement, after the aging process, lost its stability at different extent. The obtained results indicate the need to increase the resistance of composites for various purposes under conditions of biocorrosion at the stage of design and updating of regulatory documents, including tests for fungal resistance in the list of mandatory.

scholarly journals ANALYSIS OF WAYS TO INCREASE RADIATION PROTECTION OF BUILDING MATERIALS

2021 ◽  
Vol 30 (1) ◽  
pp. 34-41
Author(s):  
V. Kovalskiy ◽  
◽  
M. Drukovanyy ◽  
Y. Oliinyk ◽  
◽  
...  
Keyword(s):  
Construction Industry ◽  
Radiation Protection ◽  
Building Materials ◽  
Natural Radionuclides ◽  
Environmental Safety ◽  
Scientific Development ◽  
Building Structures ◽  
Radiation Background ◽  
Protective Properties ◽  
Resource Characteristics

The paper considers the problems of environmental pollution by radiation-hazardous and environmentally harmful elements. Radiation-hazardous pollution occurs in several directions, namely under the influence of constant natural radiation background, due to Chernobyl emissions, nuclear energy production, pollution of rivers and lakes, the use of building materials with high content of natural radionuclides. At present, Ukraine has suspended comprehensive measures to reduce radiation pollution in the construction industry due to the lack of effective methods to combat environmental safety and improve the demographic situation in the country. As ways to increase the radiation-protective properties of building materials, variants of structural models, construction technologies are considered, the introduction and improvement of which is a prospect of scientific development of the construction industry. For environmentally safe, economically feasible, systematically operated operation of building structures and construction sites in general, it is essential to adhere to the principles of radiation protection by optimizing the resource characteristics of the respective facilities. Therefore, the analysis of the relevance of the above methods of creating high-quality building materials, taking into account the indicators of increasing the radiation-protective properties of building materials.

REPORTS OF THE TSHA ISSUE 293 (PART I)

2021 ◽  
Author(s):  
L. V. Verzunova ◽  
Keyword(s):  
Information Technologies ◽  
Building Materials ◽  
Materials Science ◽  
Land Reclamation ◽  
Environmental Safety ◽  
Scientific Conference ◽  
Industrial Complex ◽  
Land Protection ◽  
Complex Development ◽  
Livestock Products

The collection includes articles based on the reports of scientists of the K. A. Timiryazev RGAU-MSHA, other universities and research institutions at the International Scientific Conference dedicated to the 155th anniversary of the K. A. Timiryazev RGAU-MSHA, which was held on December 2-4, 2020. The materials are presented on topical issues: land reclamation, reclamation, land protection and water supply, water resources management, hydraulic structures on hydro-reclamation systems; civil, industrial and agro-industrial construction, expertise and evaluation of industrial, civil buildings and building materials science; technosphere and environmental safety; reclamation and construction machines; information technologies in the agro-industrial complex; development of sheep and goat breeding in modern conditions; veterinary medicine and safety of livestock products, technologies for the production of feed and full nutrition of animals, biology, private zootechny; beekeeping and aquaculture.

Assessment of contamination by rocket fuel components of remedied sites of silo launchers

2021 ◽  
Vol 61 (9) ◽  
pp. 567-571
Author(s):  
Olga N. Semenova ◽  
Tatyana V. Ryabova ◽  
Olga M. Hudyakova ◽  
Svetlana V. Smirnova
Keyword(s):  
Building Materials ◽  
Degradation Products ◽  
Well Being ◽  
Environmental Safety ◽  
Ecological Condition ◽  
Chemical Safety ◽  
Rocket Fuel ◽  
Nature Restoration ◽  
Liquid Rocket ◽  
Chelyabinsk Region

Introduction. The use of highly toxic and highly hazardous components of liquid rocket fuel in silo-based intercontinental ballistic missiles makes it necessary to assure the health and epidemiological well-being of the population and environmental safety when eliminating silo launchers. The study aims to assess the chemical safety of the sites of silo launchers after their elimination by detonation and remediation of disturbed lands. Materials and methods. Samples of soil, water, vegetation were taken at 20 remedied sites of the former silo launchers of "single start" located in the Chelyabinsk region and the Altai Territory. These samples were analyzed in an accredited laboratory for the content of unsymmetrical dimethyl-hydrazine and its degradation products using certified photometric methods. Results. At the time of the survey in 2019, in 19 of 20 sites of former silo launchers, facts of unauthorized intrusion to the remedied sites were established in order to recover a scrap of non-ferrous and ferrous metals, building materials up to the depth of the location of the destroyed shafts of mine structures. In soil samples from 3 sites of silo launchers located in the Chelyabinsk region, asymmetric dimethyl-hydrazine was found in concentrations exceeding the MPC by 1.02 - 1.6 times. In water samples from open and water-flooded shafts of silo launchers, degradation products of unsymmetrical dimethyl-hydrazine were absent. Contamination of herbaceous and coniferous vegetation with asymmetric dimethyl-hydrazine at the surveyed sites has not been established. Conclusion. Soil contamination with asymmetric dimethyl-hydrazine at three remedied sites of 20 surveyed ones may be the result of their unauthorized opening. After the intrusion, the orphan sites of the silo launchers become objects of increased chemical hazard and environmental risk. Such things require carrying out nature restoration work, strengthening supervision over their technical, health and ecological condition.

scholarly journals TECHNOLOGY OF CREATING AND USAGE OF PROECOLOGICAL BLOCK EMPTYSEED

space&FORM ◽  
2021 ◽  
Vol 2021 (47) ◽  
pp. 31-44
Author(s):  
Jan Cudzik ◽  
◽  
Konstancja Olszewska ◽  
Keyword(s):  
Environmental Conditions ◽  
Building Materials ◽  
Environmentally Friendly ◽  
Environmental Safety ◽  
Research Process ◽  
Natural Building

Nowadays, finding natural substitutes for mass-produced materials is one of the main tasks faced by scientists and designers. There is an increasing emphasis on the theme of ecology and the need for sustainability. Variants and methods are sought which will create environmentally friendly materials in a fast, relatively inexpensive and ecological way. The aim of this paper is to present different proposals of natural building materials and to demonstrate the research process in the search for an environmentally friendly facade material, analyzing it in terms of strength, durability and aesthetics. One of the reasons for this is the steadily deteriorating environmental conditions. Thus, architects strive to improve environmental safety.

scholarly journals OBJECTS OF TRANSPORT INFRASTRUCTURE: EXPERIENCE OF SCIENTIFIC SUPPORT IN CONSTRUCTION WITHIN THE “QUALITY” CONCEPT IMPLEMENTATION

2019 ◽  
Vol 16 (5) ◽  
pp. 618-634
Author(s):  
I. S. Pulyaev ◽  
S. M. Pulyaev
Keyword(s):  
Reinforced Concrete ◽  
Building Materials ◽  
Concrete Structures ◽  
Economic Feasibility ◽  
Transport Infrastructure ◽  
Building Structures ◽  
Construction Technology ◽  
Scientific Support ◽  
Free Construction ◽  
Modern Building

Introduction. The paper deals with the issues related to the implementation of the “quality” concept in the construction of reinforced concrete transport facilities linked with the scientific support during design and construction. Nowadays this problem particularly relevant in the context of the modern construction solutions, combined with the need to obtain the required properties of concrete structures and ensure the economic feasibility of construction. The aim of the research is to generalize and systematize the main methods and techniques of concrete works, which minimize the defects and cracks while the construction of transport infrastructure.Materials and methods. On the example of different technologies used in the Russian construction over last 10 years, the authors demonstrated the developed methods of obtaining high quality concrete products taking into account tested and proved modern building materials.Results. The results of the research formed the basis of the projects, technological regulations for the production, specifications and standards of organizations, guidelines. Moreover, the results also allowed implementing the concept of “quality” in transport construction based on obtaining defect-free reinforced concrete structures with specified properties, taking into account the use of modern building materials.Discussion and conclusions. The research allows carrying out construction of various massiveness and extent. The obtained results form the basis of construction technology of other industrial and civil construction objects with reinforced concrete application. The paper is interesting and useful for specialists in providing defect-free construction of reinforced concrete building structures, for engineering and technical staff. The authors dedicate the research to the memory of Professor and Doctor of Technical Sciences, A.R. Solovyanchik (1938-2019).

Experimental method of evaluation of performance easily disposable construction

2020 ◽  
pp. 127-137
Author(s):  
V.V. Nizhnyk ◽  
◽  
O.F. Nikulin ◽  
S.V. Pozdeev ◽  
D.O. Dobriak ◽  
...  
Keyword(s):  
Experimental Evaluation ◽  
Building Materials ◽  
Excess Pressure ◽  
Design Parameters ◽  
Building Structures ◽  
Confined Space ◽  
Technical Parameters ◽  
Experimental Stand ◽  
Working Volume ◽  
Method Of Evaluation

This article presents the current state of affairs in cases of explosions in Ukraine and preventive measures to protect against them. The relevance of studies on the substantiation of the methodology for calculating the parameters of easily disposable structures for explosive and fire hazardous premises has been determined. The analysis of domestic and foreign regulatory documents for the design and installation of window openings in buildings for various purposes is carried out. The permissible values of the overpressure of the explosion, which does not cause significant damage to building structures and is safe for people, are considered. The subject of the study is the effect of the amount of gas on the design parameters of the research stand for the experimental evaluation of easily disposable structures. The purpose of this work is to substantiate the design and the main technical parameters of the research stand for assessing the performance of easily sisposable structures. The essence of the proposed research method is to create an excess pressure from the explosion of a mixture of propane-butane with air in the working volume and to study the effect of this excess pressure of the explosion on a prototype of an easily disposable structure. An experimental stand for studying the processes of the influence of the magnitude of the overpressure of an explosion in a confined space on the design parameters of easily disposable structures is simple in design, provides an imitation of a part of a building (structure) fragment and makes it possible to study the possibility of using certain building materials with different geometric parameters as easily disposable structures, which, in turn, allows the researcher to obtain more reliable data for analysis. The existing experimental methods for evaluating the parameters of easily disposable structures are analyzed. The dimensions of the research stand and the parameters of its enclosing structures, the critical values of the overpressure of the explosion, which the stand should create, and the minimum amount of gas, the combustion of which will provide the necessary overpressure of the explosion in the stand, are substantiated. A fundamentally new stand for the experimental evaluation of the parameters of easily disposable structures, a program and experimental research methodology have been developed.

STRENGTHENING SUPPORTING COLUMNS WITH CARBON CONCRETE

2021 ◽  
Vol 95 (3) ◽  
pp. 59-67
Author(s):  
K. HOLSCHEMACHER ◽  
◽  
A.G. BULGAKOV ◽  
W. POLIENKO ◽  
◽  
...  
Keyword(s):  
Composite Material ◽  
Building Materials ◽  
Point Load ◽  
Geometrical Parameters ◽  
Building Structures ◽  
Technical School ◽  
Load Bearing ◽  
Floor Slabs ◽  
Wide Range ◽  
The Subject

Textile concrete is an innovative composite material that has been the subject of intensive research since the beginning of the 90s of the last century. After the approval of the rules and regulations on its application to strengthen floor slabs, an important step was taken towards its entry into the building materials market. Questions regarding the reinforcement of rod-shaped load-bearing elements of building structures need additional research. Despite the great potential available, the method of tying load-bearing supports and columns is still not well understood. There is a need for research on a wide range of geometric parameters and the reinforcement systems used. The Institute of Reinforced Concrete of the Higher Technical School in Leipzig tested various samples of carbon-reinforced samples in a wide range of geometrical parameters. Their goal was to assess the effect on a possible increase in the bearing capacity of carbon-reinforced columns at a concentrated point load.

Shaping Indeterminate Frames

2021 ◽  
Vol 62 (3) ◽  
pp. 172-184
Author(s):  
Paul Mayencourt ◽  
John Ochsendorf ◽  
Caitlin Mueller
Keyword(s):  
Case Studies ◽  
Building Materials ◽  
Design Space ◽  
Frame Structures ◽  
Building Structures ◽  
Or Efficiency ◽  
Intergovernmental Panel ◽  
Indeterminate Structures ◽  
Design Options ◽  
The Impact

The large impact of building structures on the environment must be reduced to meet the global targets fixed by the Intergovernmental Panel on Climate Change. Standard building structures with constant prismatic cross-section have material inefficiencies of around 66% (and up to 75% in some cases) that need to be addressed. Structural shaping, a subfield of shape optimization, offers a pathway to reduce the impact of building materials on the environment. Shaping statically determinate structures such as simply supported beams is relatively straightforward, but offers few design options compared to statically indeterminate structures. However, no methods provide an efficient way for designers to shape these systems according to their design intent or efficiency goals. Based on plasticity theory, this paper presents a shaping methodology to explore the design space of shaped indeterminate frame structures. The methodology is implemented in three case studies.<br/> In all the case studies, the methodology allows for the exploration of material-efficient yet diverse designs of shaped indeterminate frame structures. The implementation of this methodology can promote the use of structural shaping by offering more agency to structural designers to create diverse and efficient structural systems.

Pottery Complex of the Second Half 13th – First Half 15th Centuries from Excavations in Kamianets-Podilskyi

2021 ◽  
Vol 2021 (6) ◽  
pp. 136-179
Author(s):  
Pavlo Nechytaylo ◽  
◽  
Olena Onohda ◽  
◽  
◽  
...  
Keyword(s):  
Material Culture ◽  
Middle Ages ◽  
Large Scale ◽  
Building Materials ◽  
Building Structures ◽  
15Th Century ◽  
Late Middle Ages ◽  
Wide Range ◽  
Grand Duchy Of Lithuania ◽  
Culture Development

The paper analyses ceramics and buildings remains of the second half 13th – first half 15th centuries, coming from excavations in Kamianets-Podilskyi. It aims to introduce materials into scientific circulation, to compare the collection with synchronous objects from adjacent territories, to trace interactions in the material culture development in late medieval towns. Ceramics of the Golden Horde and the Grand Duchy of Lithuania times began to be systematically researched relatively recently in Ukraine. Thus, the materials from Kamianets-Podilskyi contribute to deepening our knowledge of less-known periods in the history of Ukraine and Eastern Europe. Materials analyzed were obtained during rescue archaeological research on the Polish Market square in Kamianets. These were fragmented parts of underground and aboveground building structures, as well as a collection of various household items. Building materials were mostly local clays and loam, less often wood and stone were used. A set of clay ‘roll’ blocks set in one of the pits allows us to assume similarity with the Golden Horde building technologies. Finds of coins and Crimean polychrome bowls fragments also indicate the complex emerged during the Golden Horde period. However, certain groups of pottery and coins of European minting define the complex upper date within the first half 15th century. Diverse ceramic types range from the complex is an interesting local typological phenomenon. It reflects mutual influences of the pottery traditions development both in time and space. After processing artefacts collection, the main groups of pottery were identified according to technological features. Some of them are rooted in the local ancient Rus’ traditions, others were formed under the influence of Western trends, while samples of a ‘specific’ group were common for almost the entire territory of modern Ukraine during Late Middle Ages. Pots collection was preliminary systematized up to 5 most common types selection, based on rim profiles. Many of them have a wide range of analogies, locally from Kamianets, as well as from the Western Ukraine, in Poland, Moldova and Romania. In addition to pots, the collection includes other types of kitchen and tableware, such as makitras, lids, jars and other single samples of ceramics. The typological diversity correlates with the multi-layered processes which took place in Kamianets-Podilskyi life during the Golden Horde and the Lithuanian periods. Materials from the complex, as well as other finds from synchronous objects within the city, deepen our understanding of the city’s development large-scale picture, which, however, requires further research.

EVALUATION OF THE INFLUENCE OF MICROWAVE RADIATION OF MICROWAVE OVENS ON WATER AS A SUBSTRATUM FOR PLANT GROWTH

2016 ◽  
Author(s):  
Vadim Mamienko ◽  
Ingrida Chemerys
Keyword(s):  
Microwave Radiation ◽  
Growth Parameters ◽  
Morphological Changes ◽  
Test Group ◽  
Environmental Risks ◽  
Onion Plant ◽  
Clear Trend ◽  
Vegetative Organs ◽  
Living Organisms ◽  
Test Objects

To date, there is research carried out on the effects of electromagnetic radiation on living organisms, studies are conducted on substratums that were subjected to microwave radiation. This radiation comes from a common household appliance; however, the effect of this type of radiation on the vitality of organisms is poorly researched. The purpose of the current analysis is to identify the morphological changes in vegetative organs of the test objects using microwave-irradiated water as a substrate. The object of the study – the onion plant (Allium сера L.), which is perfect for objectifying environmental risks. The results showed that using the water warmed up in a microwave increased the level of oppression in the morphometric parameters. In particular, there was a clear trend of reduction of growth parameters of vegetative organs and decrease in their mass (in the test group compared to the the main one the length of the root and shoot of a plant are less than 20.5% and 27.5%, and the weight is 32.3% and 63.8% less, respectively). The correlation analysis showed that the root length is the most reliable morphometric indicator that reacts sensitively to changes in water quality caused by microwave irradiation (r = –0.9995).

Sign in / Sign up

Export Citation Format

Share Document