DEVELOPMENT OF A HEAT-DRIVEN DEVICE FOR MOLDING LARGE-SIZED CONCRETE PRODUCTS

2021 ◽  
pp. 120-126
Author(s):  
А.Ю. Боташев ◽  
А.А. Мусаев ◽  
М.А. Саидов
Keyword(s):  
High Power ◽  
High Performance ◽  
Concrete Slab ◽  
Thermal Power ◽  
High Strength ◽  
Fuel Mixture ◽  
Pressing Force ◽  
Power Drive ◽  
New Type ◽  
The Cost

Устройство с тепловым энергоприводом для прессования является разновидностью импульсных устройств. Оно позволяет значительно снизить себестоимость прессуемых железобетонных изделий. Для обеспечения высокой мощности устройства для прессования и уменьшения его габаритных размеров и металлоемкости в его конструкции используется тепловой энергопривод внутреннего сгорания. Существующие прессы для прессования бетонных изделий большой мощности конструктивно сложны и дороги. Поэтому прессование применяют в основном при формовании штучных бетонных изделий небольшого размера. Разработан новый вид устройства для прессования крупногабаритных бетонных изделий. Для выполнения этой цели сделано устройство с тепловым энергоприводом для прессования крупногабаритных бетонных изделий, обеспечивающее высокую прочность этих изделий. Разработанное устройство имеет высокую производительность. Получены зависимости для определения энергосиловых параметров данного устройства, а также необходимой величины давления топливной смеси, обеспечивающей осуществление процесса прессования. В частности, для прессования бетонной плиты площадью 1мвполне достаточно давления топливной смеси 0,9 МПа. При этом давление и усилие прессования составляют: P = 11,7 МПа При увеличении давления топливной смеси до 2 МПа усилие прессования достигает 20 МН, что вполне достаточно для прессования крупногабаритных бетонных изделий A device with a thermal power drive for pressing is a type of impulse devices. It allows one to significantly reduce the cost of compacted reinforced concrete products. To ensure high power of the device for pressing and to reduce its overall dimensions and metal consumption, a thermal energy drive of internal combustion is used in its design. Existing presses for molding concrete products of high power are structurally complex and expensive. Therefore, pressing is used mainly in the formation of small-sized concrete pieces. This article is devoted to the development of a new type of device for pressing large-sized concrete products. To achieve this goal, we developed a device with a thermal power drive for pressing large-sized concrete products, which ensures the high strength of these products. The developed device has a high performance. We obtained dependences for determining the power parameters of the device, as well as the required pressure of the fuel mixture, which ensures the implementation of the pressing process. In particular, for pressing a concrete slab with an area of 1 m, a fuel mixture pressure of 0.9 MPa is sufficient. In this case, the pressure and the pressing force are: P = 11,7 МРа , With an increase in the pressure of the fuel mixture to 2 MPa, the pressing force reaches 20 MN, which is quite enough for pressing large-sized concrete products

Applications of FRP Material in Bridge Structures

2013 ◽  
Vol 798-799 ◽  
pp. 249-252 ◽  
Author(s):  
Li Jun Jia ◽  
Yang Jiang
Keyword(s):  
High Performance ◽  
Mass Density ◽  
High Strength ◽  
Small Mass ◽  
Suspension Bridges ◽  
Steel Material ◽  
Reinforced Plastic ◽  
Bridge Structures ◽  
New Type ◽  
Corrosion Of Steel

For bridge structures using the traditional steel material, some problems are hard to solve, such as corrosion of steel bar and fatigue of steel deck. And the self-weight stress of the traditional high-strength steel as the material of cable stayed and suspension bridges will limit the main span and load-carrying. As a new type of high performance structural material, fiber reinforced plastic (FRP) has many advantages, such as small mass density, high tensile strength, excellent corrosion and fatigue resistant ability. Therefor in recent years, it has attracted much attention by the construction industry. In this paper, characteristics of FRP material are introduced and then applications of FRP material in bridge structures are discussed.

scholarly journals A new type of hollow-shallow steel and concrete composite floor beam

2021 ◽  
Vol 15 (4) ◽  
pp. 65-73
Author(s):  
Vu Anh Tuan ◽  
Han Ngoc Duc ◽  
Nguyen Dinh Hoa ◽  
Nguyen Tran Hieu ◽  
Nguyen Trung Kien
Keyword(s):  
Composite Beam ◽  
Composite Structures ◽  
Concrete Slab ◽  
Raw Material ◽  
Secondary Beam ◽  
Shear Connection ◽  
Connected Surface ◽  
New Type ◽  
Development Orientation ◽  
The Cost

Recently in Vietnam, steel-concrete composite structures especially composite beams are widely constructed in high-rise buildings. To apply broader in construction field mainly in secondary beam systems, the new type of slim-floor composite beam is proposed to aim at reducing the cost, saving the raw material, and decreasing the overall floor depth for sustainable development orientation. This type of floor beam structure consists of built-up hollow-shallow steel beam mandatory connected with cast in situ concrete slab through the openings at both side of web along the beam. The shear connection level of composite beam is depended on not only the friction at the connected surface between hollow steel section and concrete but also the shear resistance of concrete dowels, which go through the openings. The paper deals with an innovative shape of cross-section and design philosophy of composite beam according to EN 1994-1-1.

scholarly journals Design and Simulation Analysis of a New Type of Assembled UHPC Collision Avoidance

2020 ◽  
Vol 10 (13) ◽  
pp. 4555
Author(s):  
Lingyu Zhou ◽  
Huayong Li ◽  
Jun Wei ◽  
Xingxu Pu ◽  
Akim D. Mahunon ◽  
...  
Keyword(s):  
Collision Avoidance ◽  
High Performance ◽  
High Performance Concrete ◽  
Simulation Analysis ◽  
High Strength ◽  
Ultra High Performance Concrete ◽  
New Type ◽  
Collision Force ◽  
Main Components ◽  
Energy Absorbing

Ship-bridge collisions are one of the most common types of accidents, and bridge anti-ship collision devices are of great importance for bridge protection. First, a new type of assembled ultra-high performance concrete (UHPC) collision avoidance is proposed in this paper. The main components of the device are double-deck, two-way, densely reinforced ultra-high performance concrete floating boxes that are connected by high-strength bolts to form the whole structure and are equipped with steel supporting elements to form a collision energy dissipation device. The device is self-floating in water, is strongly energy absorbing due to plastic deformation, has a high degree of toughness, is corrosion resistant, and so on. This device also benefits from modular manufacturing, efficient installation, and easy replacement of damaged parts. Then, in this paper, the main parameters of the new collision avoidance, such as the material of the internal supporting elements, the wall thickness of the floating box, and the reinforcement ratio of the floating box, are optimized. Finally, a performance analysis and evaluation of the UHPC collision avoidance for the Honghe Bridge in Zhuhai City are carried out by using LS-DYNA program. The numerical results show that the new collision avoidance has significant advantages in reducing the ship–bridge collision force, prolonging the ship–bridge collision time, and protecting the ship. The results show that the assembled UHPC collision avoidance system is very effective for protecting ships and bridges in the event of a ship–bridge collision.

A High-Performance Alumina Desiccant

2019 ◽  
Vol 19 (6) ◽  
pp. 421-429 ◽  
Author(s):  
V. Yu. Kruglyakov ◽  
A. V. Glazyrin ◽  
E. P. Mescheryakov ◽  
I. A. Kurzina ◽  
L. A. Isupova
Keyword(s):  
Nitric Acid ◽  
Specific Surface ◽  
High Performance ◽  
Thermal Activation ◽  
Practical Interest ◽  
High Strength ◽  
Activation Product ◽  
Synthesis Conditions ◽  
Sorbent Regeneration ◽  
The Cost

The effect of the synthesis conditions – features and content of an alkali used for hydration of the gibbsite thermal activation product, and the content of nitric acid (acidity modulus) used to obtain the extrusion paste – on the properties of alumina desiccants was studied. The synthesized desiccant outperforms foreign and Russian analogs in dynamic capacity (above 10.0 g/100 g) at close values of specific surface area (ca. 300 m2/g) and static capacity (20–22 g/100 g). The desiccant has a high strength (above 8.0 MPa). Its application can increase the performance of existing adsorbers and decrease the cost of sorbent regeneration, which is certainly of practical interest.

scholarly journals Carbon fiber. Obtaining, modification, properties, applications.

2020 ◽  
Vol 62 (5) ◽  
pp. 1-42
Author(s):  
Anna N. Nurmukhametova ◽  
Keyword(s):  
Carbon Fiber ◽  
Carbon Fibers ◽  
High Performance ◽  
Waste Heat ◽  
High Strength ◽  
Subject Area ◽  
Reinforced Plastic ◽  
The Cost ◽  
Polyacrylonitrile Precursor

The main methods for producing a polyacrylonitrile precursor, methods for producing carbon fiber, its properties, and applications are presented. Patent research in the field of polyacrylonitrile precursor and carbon fiber. Technological problems in the subject area are identified, namely the development of technologies and equipment for producing high-strength carbon fiber, the development of technologies and equipment to reduce the cost of carbon fiber production, the development of technologies for improving the quality of carbon fiber-based composites, and the main ways to solve them are given. Ways to solve them are developing a technology for producing a polyacrylonitrile precursor for producing high-strength carbon fibers by the wet spinning method, developing a “dry-wet” method for producing polyacrylonitrile, developing high-performance equipment for producing technical polyacrylonitrile precursor in the form of bundles, developing technologies and equipment for efficient regeneration and utilization waste, heat and emissions from the production of carbon fibers, the development of new compositions of precursors and the transition to materials with a higher linear density, optimization of the structure of carbon fiber reinforced plastic to increase strength, the development of technologies and the creation of production of modern types of binders, including the addition of nanoparticles. The main methods for modifying the surface of a carbon fiber that are currently existing are considered.

scholarly journals Innovative design approach of precast–prestressed girder bridges using ultra high performance concrete

2010 ◽  
Vol 37 (4) ◽  
pp. 511-521 ◽  
Author(s):  
H. Almansour ◽  
Z. Lounis
Keyword(s):  
Prestressed Concrete ◽  
High Performance ◽  
High Performance Concrete ◽  
Concrete Slab ◽  
High Strength ◽  
Design Approach ◽  
Highway Bridge ◽  
Efficient Design ◽  
Ultra High Performance Concrete ◽  
Prestressed Concrete Girders

The construction of new bridges and the maintenance and renewal of aging highway bridge network using ultra high performance concrete can lead to the construction of long life bridges that will require minimum maintenance resulting in low life cycle costs. Ultra high performance concrete (UHPC) is a newly developed concrete material that provides very high strength and very low permeability to aggressive agents such as chlorides from de-icing salts or seawater. Ultra high performance concrete could enable major improvements over conventional high performance concrete (HPC) bridges in terms of structural efficiency, durability, and cost-effectiveness over the long term. A simplified design approach of concrete slab on UHPC girders bridge using the Canadian Highway Bridge Design code and the current recommendations for UHPC design is proposed. An illustrative example demonstrates that the use of UHPC in precast–prestressed concrete girders yields a more efficient design of the superstructure where considerable reduction in the number of girders and girder size when compared to conventional HPC girders bridge with the same span length. Hence, UHPC results in a significant reduction in concrete volume and then weight of the superstructure, which in turn leads to significant reduction in the dead load on the substructure, especially for the case of aging bridges, thus improving their performance.

scholarly journals Thermomechanically Induced Precipitation in High-Performance Ferritic (HiperFer) Stainless Steels

2020 ◽  
Vol 10 (16) ◽  
pp. 5713 ◽  
Author(s):  
Xiuru Fan ◽  
Bernd Kuhn ◽  
Jana Pöpperlová ◽  
Wolfgang Bleck ◽  
Ulrich Krupp
Keyword(s):  
Mechanical Properties ◽  
Stainless Steels ◽  
High Performance ◽  
Thermomechanical Processing ◽  
Thermal Power ◽  
Power Conversion ◽  
Treatment Parameter ◽  
New Type ◽  
Alloy Microstructure ◽  
The Impact

Novel high-performance fully ferritic (HiperFer) stainless steels were developed to meet the demands of next-generation thermal power-conversion equipment and to feature a uniquely balanced combination of resistance to fatigue, creep, and corrosion. Typical conventional multistep processing and heat treatment were applied to achieve optimized mechanical properties for this alloy. This paper outlines the feasibility of thermomechanical processing for goal-oriented alteration of the mechanical properties of this new type of steel, applying an economically more efficient approach. The impact of treatment parameter variation on alloy microstructure and the resulting mechanical properties were investigated in detail. Furthermore, initial optimization steps were undertaken.

scholarly journals Special features of obtaining fine powders for additive technologies

2019 ◽  
Vol 91 ◽  
pp. 02037
Author(s):  
Elena Matys ◽  
Yury Deniskin ◽  
Ekaterina Stativa ◽  
Dmitriy Shlychkov
Keyword(s):  
High Pressure ◽  
High Performance ◽  
Additive Technologies ◽  
Grinding Process ◽  
Fine Powders ◽  
Concrete Mixtures ◽  
New Type ◽  
Production Technologies ◽  
The Cost ◽  
Ground Material

The paper discusses some issues of fine powders production technologies adjustment. These powders can be used in concrete mixtures for 3D building printers. The work proposes the implementation of vibrational sieves which use the dry method of sifting fine and ultra-fine powders with high performance and efficiency. In this technology, ground material is removed from the mill which prevents the material from consolidation and the grinding process from the slowdown. The paper focuses on a new type of equipment able to withstand overload conditions of up to 30g. It is lightweight, compact, it does not require filters, cyclones, high-pressure fans, sluice feeders. Its sieves do not clog and do not require tightening which considerably simplifies and reduces the cost of operation.

New Isolation Technology of Rural Buildings

2013 ◽  
Vol 639-640 ◽  
pp. 825-831
Author(s):  
Shou Ping Shang ◽  
Bo Wen Zhu ◽  
Xue Zhang Wen
Keyword(s):  
Rural Areas ◽  
High Performance ◽  
Shaking Table ◽  
Isolation Layer ◽  
Rural Buildings ◽  
Practical Engineering ◽  
New Type ◽  
The Cost ◽  
Constructional Column ◽  
Great Damage

China is a large agricultural nation where most of the population and national economy is concentrated in rural areas. At the meantime, our country is a seismic country where earthquakes frequently take place. The earthquake disaster of Wenchuan in 2008 seemed that it always cost a great damage in rural areas. According to the present situation, a new type of seismic practical technology called steel-asphalt composite isolation lay is put forward with the characteristics of economic, simple and reliable. In order to test the effect of the new isolation layer, we have built a new house in use of the isolation layer nearby the rural areas in Changsha, beside the shaking table experiment in laboratory. The practical engineering in masonry structure has three floors and a basement. After the structure of the house had been finished, we tested the isolation effectiveness of the house. The results showed that the isolation layer can decay the acceleration about 40% and the isolation effectiveness is very well. Therefore, the seismic grade of the super structure can be reduced. So we took use of the High Performance Ferrocement Laminate as the ring beam and constructional column instead of the reinforced concrete. The cost of the upper structure can be reduced. And the money can be taken used on the building of the isolation layer. Therefore the whole cost of the structure didn’t increased.

Design of Movable Bracket for Dual-Axis Tracking Solar Thermal Power System

2012 ◽  
Vol 209-211 ◽  
pp. 1830-1835
Author(s):  
Bo Song ◽  
Yong Zhang ◽  
Fang Bin Xu
Keyword(s):  
Power System ◽  
Thermal Power ◽  
Pilot Project ◽  
Solar Thermal ◽  
Support Structure ◽  
Structure Selection ◽  
Solar Thermal Power ◽  
Thermal Power System ◽  
New Type ◽  
The Cost

Movable bracket as an important part of dual-axis tracking solar thermal power system is large, movable and complex of its force with the orbit of connected nodes. At the same time, the system has strict requirements on removable bracket’s deformation. The technical feasibility and the cost lever of the bracket structure play decisive roles in the promotion of the application of this new type of solar thermal power system. This paper clarifies the applications operation of solar power system on the basis of the principle of the performance of the support structure for the system requirements, summarizes the mechanical characteristics of the bracket structure, combined with the analysis of the pilot project support structure selection, expounds the key points of structural selection, and determines a more reasonable form of the support structure.

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