scholarly journals Modern technologies of a mineral material surface improvement for transport construction

2018 ◽  
Vol 239 ◽  
pp. 01006
Author(s):  
Larisa Svatovskaya ◽  
Vladislav Britov ◽  
Ivan Drobychev
Keyword(s):  
Concrete Surface ◽  
Experimental Methods ◽  
Silica Sol ◽  
Material Surface ◽  
Mineral Surface ◽  
Foam Concrete ◽  
Aggressive Environment ◽  
Mineral Material ◽  
Modern Technologies ◽  
Surface Improvement

The paper deals with technologies of a mineral material surface improvement for transport construction. Mineral surface is important because of its hardness, durability and other properties. Besides, it is necessary to protect it from aggressive environment. The purpose of the article is to introduce a few techniques of silica sol use in order to change mineral surface properties. The absorption, irrigation and watering processes were applied as the techniques. Both silica sol and its mixes with solutions contained Ca(II) ions were used as the substances. The experimental methods were carried out during the study. The experiment results have shown that hardness of the mineral material and foam concrete surface was increased up to 60% and the level of the soil strengthening was more than 0,5 MPa. It means that if silica sol and solutions containing Ca(II) ions are used a soil strength is increased more than 40-50%. The results of the study are particularly useful for construction of motorways in order to extend their service life.

scholarly journals SILICA SOL APPLICATION IN GEOCONSTRUCTION

2019 ◽  
Vol 16 (31) ◽  
pp. 711-718
Author(s):  
L. B. SVATOVSKAYA
Keyword(s):  
Heavy Metal ◽  
Substance Use ◽  
Environmental Pollution ◽  
Metal Ion ◽  
New Technologies ◽  
Experimental Methods ◽  
Silica Sol ◽  
Heavy Metal Ion ◽  
Pure Substance

The article deals with a number of topical issues connected with transport geoconstruction and environmental pollution such as heavy metal ion pollutions of soils. The main aim of the study is to present new problem solutions and technologies for geoconstruction concerning pure substance use for lithosphere. Silica sol solution was chosen as this substance. The choice was made because of silica sol nature. Having important properties, it is the purest substance for the environment. Experimental methods were carried out. The study introduces new technologies of silica sol solution use in geoconstruction systems: silica sol detoxication technology (SDT) for soils, silica sol absorption technology (SAT), soil strengthening technology (SST), silica sol blocking action technology (SBT). The article shows the examples of these technologies’ application and examines new main properties of geoconstruction systems.

MINERAL MATERIAL SURFACE KINETICS IN HYDROTHERMAL REACTIONS

2003 ◽  
Author(s):  
XUETONG ZHANG ◽  
RONGHUA ZHANG ◽  
SHUMIN HU ◽  
CHENGYIN SHI ◽  
JING ZHANG
Keyword(s):  
Material Surface ◽  
Surface Kinetics ◽  
Hydrothermal Reactions ◽  
Mineral Material

THE STREES AS THE MAIN ELEMENT OF PROSODICS

2020 ◽  
Vol 1 (3) ◽  
pp. 200-205
Author(s):  
Maftuna Gazieva ◽  
◽  
Mashhura Burxanova
Keyword(s):  
Experimental Analysis ◽  
Experimental Methods ◽  
Lexical Stress ◽  
Main Element ◽  
Visual Images ◽  
Prosodic Feature ◽  
Modern Technologies

This article discusses lexical stress, which is the unit of intonation. As a prosodic feature, stress is studied through experimental methods. The division of languages into dynamic, quantitative and musical-accented languages according tomelodic, elongated and quantitative signs of stress is determined experimentally. Visual images of lexical stress are provided through experimental analysis carried out using modern technologies. Based on the results obtained, various views on the types of lexical stress in the Uzbek language are critically generalized

Technology of special concretes on sulfur and sulfur-bitumen binders

2019 ◽  
Author(s):  
Борис Усов ◽  
Boris Usov ◽  
Татьяна Горбунова ◽  
Tatiana Gorbunova
Keyword(s):  
Higher Education ◽  
Graduate Students ◽  
Educational Institutions ◽  
Federal State ◽  
Educational Standards ◽  
Higher Educational Institutions ◽  
Aggressive Environment ◽  
Self Study ◽  
State Educational ◽  
Modern Technologies

The publication is a textbook for teaching and studying in technical higher educational institutions of modern technologies for the production of special concretes on sulfur and sulfur-bitumen binders. The results of foreign and domestic researchers on the use of sulfur in structures, products operating in an aggressive environment, and types of modification of road bitumen and asphalt. Meets the requirements of the Federal state educational standards of higher education of the last generation. For students studying in the areas of training 08.03.01 and 08.04.01 "Construction" and specialty 08.05.01 "Construction of unique buildings and structures", as well as for graduate students. It is also useful for self-study.

The Influence of Plasma Nitriding Period on Nitrided Layers Thickness

2016 ◽  
Vol 258 ◽  
pp. 395-398 ◽  
Author(s):  
Ondrej Pilch ◽  
Vojtěch Hruby
Keyword(s):  
Optical Microscopy ◽  
Plasma Nitriding ◽  
Nitrided Layer ◽  
Surface Hardness ◽  
Experimental Methods ◽  
Nitriding Process ◽  
Material Surface ◽  
Hardness Testing ◽  
Surface Layers ◽  
Cross Sectional

The plasma nitriding as a technology for finishing of material surface layers was carried out on selected material. The effect of plasma nitriding conditions on the thickness and hardness of nitrided layer was investigated. The influence of plasma nitriding period on the thickness of the plasma nitrided layers was comprehensively assessed on the C55 steels. Plasma nitriding was carried out on selected material at 500 °C under 280 Pa with a mixture atmosphere of H2 and N2 in the plasma nitriding equipment. The period of the plasma nitriding process was changeable from 5 to 20 hours. Measurements of the properties of nitrided layers of selected material were solved by using experimental methods in accordance with standards. The samples were characterized by GDOES spectrometry, optical microscopy, and hardness testing. The depths of the plasma nitriding layers were also detected using cross-sectional microhardness profiles. Relation between plasma nitriding period and a thickness of a nitrided layer was explained and has shown that microhardness and surface hardness of mentioned samples were significantly increased.

scholarly journals Mitigation Technologies for Damage Induced by Pressure Waves in High-Power Mercury Spallation Neutron Sources (I)—Material Surface Improvement—

2008 ◽  
Vol 45 (7) ◽  
pp. 698-703
Author(s):  
Takashi NAOE ◽  
Masatoshi FUTAKAWA ◽  
Takahisa SHOUBU ◽  
Takashi WAKUI ◽  
Hiroyuki KOGAWA ◽  
...  
Keyword(s):  
High Power ◽  
Material Surface ◽  
Pressure Waves ◽  
Neutron Sources ◽  
Surface Improvement

Mitigation Technologies for Damage Induced by Pressure Waves in High-Power Mercury Spallation Neutron Sources (I) —Material Surface Improvement—

2008 ◽  
Vol 45 (7) ◽  
pp. 698-703 ◽  
Author(s):  
Takashi NAOE ◽  
Masatoshi FUTAKAWA ◽  
Takahisa SHOUBU ◽  
Takashi WAKUI ◽  
Hiroyuki KOGAWA ◽  
...  
Keyword(s):  
High Power ◽  
Material Surface ◽  
Pressure Waves ◽  
Neutron Sources ◽  
Surface Improvement

Performance Assessment of Precast RC Flooring Units Exposed 40 Years in Aggressive Industrial Environment

2016 ◽  
Vol 711 ◽  
pp. 737-744
Author(s):  
Radu Pascu ◽  
Dan Paul Georgescu ◽  
Adelina Apostu
Keyword(s):  
Steel Industry ◽  
Experimental Methods ◽  
Mechanical Tests ◽  
Knowledge Level ◽  
Industrial Environment ◽  
Aggressive Environment ◽  
Observed Damage ◽  
Non Destructive ◽  
Non Destructive Techniques

Performance of RC members is tightly closed to their environment. A long exposition time in aggressive environment corresponds frequently with the use of RC elements designed and produced in an epoch when technical norms, reflecting the knowledge level of the time, were insufficient to insure the durability of the elements.This paper presents the assessment of precast flooring units after 40 years of exposition in an aggressive industrial environment, specific to the steel industry. The assessment was performed using chemical and mechanical tests performed in situ and in the laboratory, using destructive as well as non-destructive techniques, applied at material and member level. Experimental methods were corroborated with calculation results.The paper presents also the steps which were taken in order to asses the performance of the concrete structural elements.The results of this study allow concluding about the causes which led to the observed damage and the identification of the remedial measures needed to restore the security of the investigated elements.

Basic Directions of Improving the Durability of the Sewage Collector Lining

2016 ◽  
Vol 843 ◽  
pp. 25-32 ◽  
Author(s):  
Elena Kulikova
Keyword(s):  
Corrosion Resistance ◽  
Mechanical Strength ◽  
Abrasive Wear ◽  
Water Resistance ◽  
Concrete Surface ◽  
External Factors ◽  
Concrete Lining ◽  
Cement Ratio ◽  
Aggressive Environment ◽  
Urban Construction

The main requirements for the sewage lining are waterproofing properties, mechanical strength, corrosion resistance, resistance to hydro-abrasive wear. Currently, neither in the literature nor in the practice of underground urban construction, there is no information about the quantitative parameters of the above requirements. This leads to uncertainty when creating new means of protection of concrete lining from the effects of external factors and aggressive media flowing through the collector tunnels. Currently, it is possible to control the characteristics of concrete (to increase its density and decrease porosity) through the introduction of additives (superplasticizers to reduce the water-cement ratio, microsilica) or coating of concrete surface materials, contributing to colmatation. It helps to increase the water resistance of concrete tunnel lining, its resistance to aggressive influences. However, this is not enough to prevent deterioration of concrete when exposed to aggressive environment. The article proposed the evaluation of the above requirements, which will solve the problem of increasing the durability of lining concrete sewers.

Resistance of Surface Layers of Concrete against Aggressive Environment

2016 ◽  
Vol 722 ◽  
pp. 44-51 ◽  
Author(s):  
Radka Pernicova ◽  
Daniel Dobiáš
Keyword(s):  
Acid Solution ◽  
Extreme Environments ◽  
Concrete Surface ◽  
Sulphuric Acid Solution ◽  
Type Ii ◽  
Long Term Effects ◽  
Surface Layers ◽  
Aggressive Environment ◽  
Measuring Surface

The article deals with the corrosive effects of acids on the selected surface layers of concrete with/ without an epoxy coating. Concrete sample was placed in extreme environments, which represented the 40% sulphuric acid solution. In addition to measuring surface degradation of concrete, this work focused on the depth of acid penetration into the sample. It can be concluded that the long-term effects of aggressive environments severely degrades the concrete surface on the samples causing corrosion of Type II.

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