scholarly journals 3D-Printed Mortars with Combined Steel and Polypropylene Fibers

Fibers ◽  
2021 ◽  
Vol 9 (12) ◽  
pp. 79
Author(s):  
Valery Lesovik ◽  
Roman Fediuk ◽  
Mugahed Amran ◽  
Arbi Alaskhanov ◽  
Aleksandr Volodchenko ◽  
...  
Keyword(s):  
Building Materials ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Polypropylene Fibers ◽  
Fine Grained ◽  
High Rise ◽  
High Adhesion ◽  
Technological Index ◽  
3D Printed ◽  
New Generation

Fibers of various origins are of great importance for the manufacture of new generation cement composites. The use of modified composite binders allows these highly efficient building materials to be used for 3D-printing of structures for various functional purposes. In this article, changes in building codes are proposed, in particular, the concept of the rheological technological index (RTI) mixtures is introduced, the hardware and method for determining which will reproduce the key features of real processes. An instrument was developed to determine a RTI value. The mixes based on composite binders and combined steel and polypropylene fibers were created. The optimally designed composition made it possible to obtain composites with a compressive strength of 93 MPa and a tensile strength of 11 MPa. At the same time, improved durability characteristics were achieved, such as water absorption of 2.5% and the F300 frost resistance grade. The obtained fine-grained fiber-reinforced concrete composite is characterized by high adhesion strength of the fiber with the cement paste. The microstructure of the developed composite, and especially the interfacial transition zone, has a denser structure compared to traditional concrete. The obtained materials, due to their high strength characteristics due to the use of a composite binder and combined fiber, can be recommended for use in high-rise construction.

scholarly journals 3D-ADDITIVE BUILDING TECHNOLOGIES. THEORY AND PRACTICE

2021 ◽  
Vol 6 (2) ◽  
pp. 8-14
Author(s):  
E. Glagolev
Keyword(s):  
Building Materials ◽  
Breaking Load ◽  
High Specific Surface Area ◽  
Theory And Practice ◽  
Raw Material ◽  
Crystal Formation ◽  
Fine Grained ◽  
High Rise ◽  
Mineral Additive ◽  
The Difference

The results of the study of the theoretical foundations of the manufacture of building materials using 3D printing based on composite binders with various molding methods and their practical testing on prototypes of fine-grained concrete are presented. The principles of regulating the structure and properties of composites through the use of a mineral modifier for the construction of high-rise building objects using 3D-additive technology are considered. The influence of the characteristics of the raw material components on the properties of the obtained composite is shown. The structure formation of the hardening cement-containing system in the presence of a mineral modifier proceeds more intensively due to the high specific surface area and energy capacity of the components, which is an active mineral additive and the basis for the crystal formation of new hydrate compounds. The difference in the strength characteristics of the printed wall is due to the direction of the sample cut. Applying a breaking load along the direction of forming of a 3D printer gives a slightly higher strength than perpendicular to the direction of forming. This phenomenon can be explained by the shape of the layer after solidification of the mixture, which is an ellipse in cross section

Controlled Cooling Process and Mechanical Property of 590MPa Grade Structural Steel with Low Yield Ratio

2011 ◽  
Vol 261-263 ◽  
pp. 740-743
Author(s):  
Jian Kang ◽  
Zhao Dong Wang ◽  
Guo Yuan ◽  
Guo Dong Wang
Keyword(s):  
Volume Fraction ◽  
Charpy Impact ◽  
High Strength ◽  
Ferrite Matrix ◽  
Yield Ratio ◽  
Controlled Cooling ◽  
Final Temperature ◽  
Ultra Fast Cooling ◽  
High Rise ◽  
New Generation

To develop 590MPa grade low yield ratio steel for high-rise buildings, the new generation TMCP based on ultra fast cooling (UFC) technology was proposed. Then effects of UFC final temperature on microstructure and mechanical properties were investigated. The results show that the control of composite phases is important to obtain high strength, low yield ratio and high work hardening exponent. When UFC final temperature is 521°C, 22.5% (volume fraction) M-A phases are distributed in bainite ferrite matrix, and the excellent overall properties can be obtained, i.e., the yield strength is 570MPa, tensile strength 760MPa, yield ratio 0.75 and percentage elongation 22% with the Charpy impact energy 284J at -40°C. All these indexes can meet the requirements of relevant standards.

Polymer Fibers in Foam Concrete Application Efficiency

2021 ◽  
Vol 1043 ◽  
pp. 55-59
Author(s):  
Vladimir Morgun ◽  
Denis Votrin ◽  
Aleksei Revyakin
Keyword(s):  
Building Materials ◽  
Physical And Mechanical Properties ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Polymer Fibers ◽  
Synthetic Fiber ◽  
Foam Concrete ◽  
Concrete Mixtures ◽  
Technical Effect ◽  
Moduli Of Elasticity

The urgency of improving the performance properties of concrete, as the most common building materials, is noted. The reasons for the increased demand for products made of high-strength gas-filled concrete are stated. It is shown that the current volume of polymer fibers production makes it possible to predict the possibility of their widespread use in construction. The information on the physical and mechanical properties of synthetic fiber, which is important for its successful use as dispersed reinforcement of foam concrete mixtures, is presented. The technology of manufacturing experimental samples and methods of their testing are described. It has been established that the introduction of any synthetic fiber into the foam mixture formulation improves the structural properties of foam concrete, however, the measure of efficiency depends on the ratio between the concrete moduli of elasticity and fiber. The greater the value of the elastic modulus of the fiber used, the higher the technical effect of its use in fiber-reinforced concrete for structural purposes can be.

scholarly journals Diagrams of Deformation of Cement Composites Reinforced with Steel Wire Fiber

2018 ◽  
pp. 143-147
Author(s):  
Yuri V. Pukharenko ◽  
Dmitry A. Panteleev ◽  
Mikhail I. Zhavoronkov
Keyword(s):  
Fracture Toughness ◽  
Reinforced Concrete ◽  
Crack Resistance ◽  
Building Materials ◽  
Steel Wire ◽  
Fiber Reinforced Concrete ◽  
General View ◽  
Fiber Reinforced ◽  
Fine Grained ◽  
Deformation Diagrams

Modern construction practice acquires such a tendency, at which it is required to use materials with increased physical, mechanical and operational characteristics, and at the same time, do not require significant material, labor and energy costs for their production. One of the most promising building materials that meet the requirements is fiber-reinforced concrete. However, the increase in the volume of its use is limited by the insufficient degree of study of its properties and characteristics. This problem is aggravated by the constantly expanding range of reinforcing fibers, which can give composites produced on their basis, completely different properties and characteristics. One of the most important characteristics of fiber-reinforced concrete is crack resistance. The most informative method of research of this characteristic is the construction and analysis of deformation and fracture diagrams of samples obtained during bending tensile strength tests. At the initial stage of the described study, several series of fiber-reinforced concrete samples were tested. During the tests, a standard method for assessing the fracture toughness of heavy and fine-grained concretes, governed by the requirements of GOST 29167, was used. A device specially designed for testing fiber-reinforced concrete was used. As a result of the tests, a general view of the deformation diagrams of fiber-reinforced concrete samples was established, strength and energy characteristics of crack resistance, as well as the modulus of elasticity were found, and the labor intensity of the tests was high. In this paper we describe a possible way of obtaining fracture patterns for fiber-reinforced concrete by calculation. The resulting diagrams of deformation of fiber-reinforced concrete samples are built on several key points, the determination of which coordinates is made by calculation. The paper compares the experimental and calculated fracture toughness characteristics of fiber-reinforced concrete manufactured using steel wire fiber. Comparison of the data presented indicates a satisfactory agreement between the calculated and experimental data, which proves the validity of the proposed method for obtaining fiber-reinforced concrete deformation diagrams.

scholarly journals Regularities of the formation and features of the influence of a fine structure on the properties of a new-generation magnesium alloy

2020 ◽  
pp. 55-63
Author(s):  
E. F. Volkova ◽  
V. A. Duyunova ◽  
I. V. Mostyaev ◽  
M. V. Akinina
Keyword(s):  
Fine Structure ◽  
Phase Composition ◽  
Magnesium Alloy ◽  
Magnesium Alloys ◽  
High Strength ◽  
Fine Grained ◽  
Long Period ◽  
Noticeable Improvement ◽  
Fine Grained Structure ◽  
New Generation

An approach to creating high-strength deformable magnesium alloys for developing a fine-grained structure and a favourable phase composition is considered. The possibility of a noticeable improvement in the characteristics of magnesium alloys by introducing REEs in certain ratios for the formation of long-period phases (LPSO phases) is considered. The regularities of formation and features of the influence of a fine structure on the properties of a new-generation magnesium alloy of the VMD16 brand are studied.

scholarly journals INCREASING IN IMPACT VISCOSITY OF FIBER-ASH-CONCRETE

2021 ◽  
Vol 3 (6) ◽  
pp. 5-16
Author(s):  
R. Fedyuk ◽  
Yu. Liseycev ◽  
A. Taskin ◽  
R. Timohin ◽  
Sergey Klyuev ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Building Materials ◽  
Bending Strength ◽  
Materials Science ◽  
Basalt Fiber ◽  
Dynamic Strength ◽  
High Strength ◽  
Cement Composite ◽  
Fiber Reinforced Concrete ◽  
The Impact

The trend in building materials science is to replace the different proportions of Portland cement in the binder. Therefore, the paper proposes the principles of controlling the static and dynamic strength of fiber-reinforced concrete, consisting in the complex effect of the hydro-removed ash and slag mix and basalt fiber on the processes of structure formation of the cement composite. A four-stage purification system for the hydro-removed ash and slag mixture has been developed, including disintegration, flotation and two-stage magnetic separation. It was found that the density of the fresh mix from the dose behaves naturally, and the density of solid samples at low doses slightly decreases. High early strength of the developed composites is noted, in particular, for specimens with ASM, one and a half increase in compressive strength is traced in comparison with non-additive specimens. Combinations of "fiber + ASM" with a quadrupling of strength have a significant effect on bending strength. Successful approximations of the compressive strength and bending strength on the ASM dose for different ages (1, 7, 28 days) are traced with the regular behavior of the coefficients in the power dependences. Revealed a multiple increase in the impact strength of the developed compositions. The use of the results will lead to the possibility of designing high-strength concretes, including for special structures.

scholarly journals A Method for the Design of Concrete with Combined Steel and Basalt Fiber

2021 ◽  
Vol 11 (19) ◽  
pp. 8850
Author(s):  
Leonid Dvorkin ◽  
Oleh Bordiuzhenko ◽  
Biruk Hailu Tekle ◽  
Yuri Ribakov
Keyword(s):  
Mechanical Properties ◽  
Reinforced Concrete ◽  
Basalt Fiber ◽  
Fiber Reinforcement ◽  
High Strength ◽  
Fiber Reinforced Concrete ◽  
Fiber Types ◽  
Fiber Reinforced ◽  
Fine Grained ◽  
Optimal Mix

Combining different fiber types may improve the mechanical properties of fiber reinforced concrete. The present study is focused on investigating hybrid fiber reinforced concrete (HFRC) with steel and basalt fiber. Mechanical properties of fiber reinforced fine-grained concrete are investigated. The results demonstrate that using optimal steel and basalt fiber reinforcement ratios avoids concrete mixtures’ segregation and improves their homogeneity. Concrete with hybrid steel and basalt fiber reinforcement has higher strength. Effective methodology for proper design of HFRC compositions was proposed. It is based on the mathematical experiments planning method. The proposed method enables optimal mix proportioning of high-strength fine-grained concrete with hybrid steel and basalt fiber reinforcement.

scholarly journals Improving energy efficiency through the use of waste heat products in the production of building materials

2021 ◽  
Vol 311 ◽  
pp. 07007
Author(s):  
Galina Medvedeva ◽  
Kamilla Giniyatova ◽  
Kamilia Minikaeva
Keyword(s):  
Sustainable Management ◽  
Building Materials ◽  
Waste Heat ◽  
Coal Ash ◽  
High Strength ◽  
Strength Properties ◽  
Waste Products ◽  
Insulating Material ◽  
Fine Grained ◽  
Cellular Concrete

Concern for the sustainable management and recycling of solid waste is becoming more visible in all sectors of the economy. This study explores the possibility of using coal ash residue (waste from Kazan CHPP-2) as a substitute for fine-grained aggregate in sulfur concrete. The trend towards an increase in the level of utilization of waste heat power engineering is an important task. The chemical composition, microstructure and mechanical properties, including density, water absorption, compressive strength and thermal conductivity of sulfur concrete, including coal ash with partial and complete sand replacement, were investigated and the results were compared with those for standard cellular concrete. The authors studied modern heat-insulating materials and materials from industrial waste products. The article analyzes the estimated thickness of the insulating material depending on the type of structure. Outside walls made of sulfur concrete, in addition to high strength properties, have high thermal and economic performance.

DILLIMAX 690

Alloy Digest ◽  
2012 ◽  
Vol 61 (5) ◽  
Keyword(s):  
Fracture Toughness ◽  
Yield Strength ◽  
Physical Properties ◽  
Structural Steel ◽  
Tensile Properties ◽  
High Strength ◽  
Heat Treating ◽  
Fine Grained ◽  
Minimum Yield

Abstract Dillimax 550 is a high-strength quenched and tempered, fine-grained structural steel with a minimum yield strength of 690 MPa (100 ksi). Plate is delivered in three qualities: basic, tough, and extra tough. This datasheet provides information on composition, physical properties, and tensile properties as well as fracture toughness. It also includes information on forming, heat treating, and joining. Filing Code: SA-652. Producer or source: Dillinger Hütte GTS.

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