Investigation of the Various Binders’ Effect on the Lime Binder Carbonate Hardening Process for its Use in Additive Technologies

2020 ◽  
Vol 1011 ◽  
pp. 123-129
Author(s):  
Alexander Bakhtin ◽  
Nikolay Lyubomirskiy ◽  
Tamara Bakhtina ◽  
Vitaliy Nikolaenko
Keyword(s):  
Inkjet Printing ◽  
Mass Fraction ◽  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Hydrated Lime ◽  
Additive Technologies ◽  
High Concentration ◽  
Hardening Process ◽  
Materials Used ◽  
Physical And Mechanical Characteristics

The obtaining carbonized material experimental studies’ results based on lime carbonate systems by 3D inkjet printing are presented. Some types of materials used as binders for inorganic binders have been studied. An effective method of hardening the model obtained in the 3D printing process is determined. The physical and mechanical characteristics of the prototypes hardened in the carbon dioxide medium or high concentration are determined. It was found that artificial carbonization of the samples obtained on various types of binders for 90 min contributes to the formation of a fairly strong structure of insoluble calcium carbonate, the hydrated lime carbonation product, and the carbonization degree depends on the type of binder and its mass fraction in the solution. The most effective types of binders were selected and the optimal content of the studied binders in the solution was determined.

scholarly journals DEVELOPMENT OF A MATERIAL BASED ON LIME-CARBONATE AND CALCIUM COMPOSITIONS FOR ADDITIVE TECHNOLOGIES

2019 ◽  
Vol 4 (4) ◽  
pp. 8-16 ◽  
Author(s):  
Т. Бахтина ◽  
Tamara Bahtina ◽  
Н. Любомирский ◽  
Nikolay Lyubomirskiy ◽  
А. Бахтин ◽  
...  
Keyword(s):  
3D Printing ◽  
Inkjet Printing ◽  
Mass Fraction ◽  
Experimental Studies ◽  
Hydrated Lime ◽  
Physicomechanical Properties ◽  
Additive Technologies ◽  
High Concentration ◽  
Physicomechanical Characteristics ◽  
Materials Used

The results of experimental studies to determine the possibility of obtaining carbonized material based on lime-carbonate-calcium compositions using inkjet 3D printing are presented. Some types of materials used as connecting for inorganic binders have been studied. An effective method of hardening the model obtained in the process of 3D printing is determined. The physicomechanical characteristics of prototypes solidified in an environment of high concentration of carbon dioxide are defined. It has been established that artificial carbonization of samples obtained on various types of binders for 90 minutes contributes to the formation of a sufficiently strong structure from insoluble calcium carbonate, a product of carbonation of hydrated lime. In this case, the degree of carbonization depends on the type of binder and its mass fraction in solution. The most effective types of binders are selected and the optimal content of the binders in solution is determined. In result, to ensure the production of materials with sufficient physicomechanical properties, a possibility of obtaining carbonized material by the method of 3D inkjet printing at certain optimal contents of the tested binders is confirmed.

Composite Polymer Mesh For Masonry

2019 ◽  
pp. 15-19
Keyword(s):  
Strain State ◽  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Structural Elements ◽  
Composite Polymer ◽  
Performance Technology ◽  
Different Types ◽  
Composite Grids ◽  
And Performance ◽  
Physical And Mechanical Characteristics

With the development and introduction of technologies for the production of composite materials for construction purposes in Russia appeared composite flexible ties, anchors, fittings, etc. These materials and products are not fundamentally new and have previously been studied for use for reinforcing concrete or structural elements. However, for increasing the bearing capacity of stone structures as masonry meshes they were practically not used, while masonry mesh is one of the most demanded materials in construction. The article presents experimental studies of composite meshes of different types and performance technology used in masonry. Experimentally substantiated and normalized values of physical and mechanical characteristics of rods for composite polymer grids are obtained. The evaluation of efficiency of composite meshes in masonry is made, the values of crack forming and rupture loads are determined, the peculiarities of the stress-strain state of composite grids as flexible ties are revealed, the fields of application are formulated.

Water Absorption Effect on the Propagation Velocity of Normal Waves in Composite Rebars

2019 ◽  
Vol 970 ◽  
pp. 202-209
Author(s):  
Olga V. Muravieva ◽  
Robert R. Khasanov ◽  
Viktor A. Strizhak ◽  
Sergey S. Mkrtchyan
Keyword(s):  
Water Absorption ◽  
Propagation Velocity ◽  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Absorption Effect ◽  
Acoustic Waveguide ◽  
Torsional Waves ◽  
Water Absorption Effect ◽  
Waveguide Method ◽  
Physical And Mechanical Characteristics

The article proposes the use of the acoustic waveguide method with normal Pochhammer waves to estimate the water absorption of composite fiberglass rebars. The results of experimental studies on the water absorption and temperature influence on the propagation velocity of rod and torsional waves in composite rebars samples with different physical and mechanical characteristics are presented. The sensitivity of the wave velocity parameter to water absorption and temperature fluctuations is estimated. The proposed acoustic waveguide method is characterized by high accuracy, reliability and efficiency.

scholarly journals Управление физико-механическими характеристиками бетона за счет варьирования высоты и шага технологических выступов хомутов виброцентрифугирующих устройств

2021 ◽  
Vol 46 (1) ◽  
Author(s):  
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Cross Section ◽  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Strength Analysis ◽  
Technological Parameters ◽  
Axial Tensile ◽  
Concrete Mix ◽  
Physical And Mechanical Characteristics

Для регулирования вариатропной структуры центрифугированных изделий авторы данной статьи совместили процесс центрифугирования с вибрированием. Во время эксперимента вибрации формы обеспечивались за счет надетых на валы установки хомутов. Представлена авторская экспериментальная установка для создания виброцентрифугированных образцов кольцевого сечения с вариатропной структурой, а также способ их изготовления. Выделены технологические параметры вибрирования, которые оказывали наиболее значимое влияние на характеристики виброцентрифугированного бетона, конструкций и изделий из него. В опытах варьировались высота технологических выступов хомутов и шаг между ними. Исследовалось влияние этих факторов на физико-механические характеристики бетона: плотность; кубиковая прочность на сжатие; призменная прочность на сжатие; прочность на растяжение при изгибе; прочность на осевое растяжение. Приведен анализ результатов экспериментальных исследований и получены следующие физико-механические характеристики виброцентрифугированных бетонов, изготовленных с использованием хомутов: лучшие – с высотой технологических выступов 5 мм и шагом между ними 30 мм, самый низкий показатель – соответственно 2,5 мм при любом шаге. Ключевые слова: виброцентрифугированный бетон, физико-механические характеристики, прочность при сжатии, плотность, бетонная смесь, центрифугирование, прочность при изгибе To regulate the variatropic structure of centrifuged products, the authors of this article combined the process of centrifugation with vibration. During the experiment, vibrations of the mold were provided with clamps set on the shafts of the installation. The author's experimental setup for creating vibrocentrifuged samples of annular cross-section with a variatropic structure, as well as a method for their manufacture is presented. The technological parameters of vibration, which had the most significant effect on the characteristics of vibrocentrifuged concrete, structures and products made of it, were identified. In the experiments, the height of the technological protrusions of the clamps and the pitch between them were varied. The influence of these factors on the physical and mechanical characteristics of concrete was investigated: density; cube compressive strength; prismatic compressive strength; bending tensile strength; axial tensile strength. Analysis of the results of experimental studies is given and the following physical and mechanical characteristics of vibrocentrifuged concretes made using clamps have been obtained: the best ones with a height of technological protrusions of 5 mm and a step between them of 30 mm, the lowest indicator is, respectively, 2.5 mm at any step. Keywords: vibrocentrifuged concrete, physical and mechanical characteristics, compressive strength, density, concrete mix, centrifugation, flexural strength

scholarly journals Determining the mechanical characteristics of composite materials reinforced with woven preforms

2021 ◽  
Vol 1 (7 (109)) ◽  
pp. 41-50
Author(s):  
Maryna Shevtsova ◽  
Andrii Kondratiev ◽  
Oleksii Andrieiev
Keyword(s):  
Composite Materials ◽  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Compression Tests ◽  
Study Program ◽  
Good Convergence ◽  
Variable Nature ◽  
Rod System ◽  
Rod Model ◽  
Physical And Mechanical Characteristics

Reduction of the complexity of production of articles from composite materials is largely ensured by the use of reinforcing semi-finished products in which fibers pre-form a framework. Among all the variety of reinforcing systems, woven sleeves (preforms) occupy a special place. The high degree of deformability in a nonimpregnated condition makes it possible to lay this reinforcement on any surface without folds and cuts that provide preservation of strand continuity. This advantage of woven sleeves is accompanied by a change in local reinforcement angles and, consequently, the variable nature of physical and mechanical characteristics of the curved part surface. A method for calculating physical and mechanical characteristics of the composite based on preforms at any point of the part depending on the pattern of laying strands on a curved surface has been developed. The possibility of application of the rod model of the composite to describe physical and mechanical characteristics of the composite material with a woven reinforcement was analyzed. The model essence consists in that the composite is modeled by a diamond-shaped rod system. The rhombus sides serve as fibers and the diagonals as the binder. To verify the theoretical results and substantiate practical recommendations, a series of experimental studies were performed based on the formation of material specimens from two types of woven sleeves with different reinforcement angles. The experimental study program included tensile, bending, and compression tests. A fairly good convergence of theoretical and experimental data was obtained. For example, a square of the correlation coefficient was not less than 0.95 for the modulus of elasticity, not less than 0.8 for the Poisson's ratio, and not less than 0.9 for tensile and compressive strengths. This is the rationale for using the rod model to describe the considered class of composites. The use of the developed procedure will make it possible to increase the perfection of the considered class of designs and obtain rational parameters of the process of their manufacture.

scholarly journals DURABILITY ASSESSMENT OF BENDING STRUCTURES MADE OF NONLINEAR ELASTIC MATERIAL

2020 ◽  
Vol 16 (4) ◽  
pp. 80-85
Author(s):  
Vladilen Petrov ◽  
Roman Mishchenko ◽  
Dmitry Pimenov
Keyword(s):  
Mathematical Model ◽  
Mechanical Characteristics ◽  
Negative Impact ◽  
Experimental Studies ◽  
Field Tests ◽  
Corrosive Media ◽  
Nonlinear Elastic Material ◽  
Durability Assessment ◽  
Nonlinear Elastic ◽  
Physical And Mechanical Characteristics

Experimental studies and field tests indicate that the effect of corrosive media leads to significant changes in the physical and mechanical characteristics of structural materials. The article proposes a mathematical model that allows predicting the negative impact of aggressive media and assessing the durability of bent structures.

scholarly journals USE OF ASSEMBLY ASH IN THE COMPOSITION OF SOIL CEMENT

2021 ◽  
Vol 29 (2) ◽  
pp. 51-65
Author(s):  
N. Blaschuk ◽  
◽  
I. Maevska ◽  
M. Goncharuk ◽  
◽  
...  
Keyword(s):  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Soil Mass ◽  
Ash Content ◽  
Reinforced Soil ◽  
Optimal Composition ◽  
Soil Cement ◽  
Ash Removal ◽  
Practical Recommendations ◽  
Physical And Mechanical Characteristics

Іn this work, we searched for the optimal composition of soil cement containing different percentage of ash removal: from minor additives to the replacement of half the soil mass for ash. The search for the optimal composition was performed on the basis of experimental studies to determine the physical and mechanical characteristics.The use of soil cement with the addition of fly ash is proposed for the reinforcement of the bases by vertical reinforcing elements. In order to develop practical recommendations on the optimal composition of soil cement, a mathematical simulation of the work of reinforced soil cement fields was performed with the variation of the physical and mechanical characteristics of piles, depending on the ash content of the ash. . Plaxis software was used for numerical simulation. With a steady step of reinforcing elements, the properties of the soil-cement mass were studied, depending on the deformability of the piles.

Physical and Mechanical Characteristic of Particleboards Produced with Residues of Sugarcane and Stem Leaves of Bamboo Bonded with Castor Oil Adhesive

2015 ◽  
Vol 1088 ◽  
pp. 652-655 ◽  
Author(s):  
Barbara Stolte Bezerra ◽  
Ivaldo D. Valarelli ◽  
Rosane A.G. Battistelle ◽  
Aline de Lima Zuim ◽  
Luiz A. Melgaço N. Branco ◽  
...  
Keyword(s):  
Sugarcane Bagasse ◽  
Castor Oil ◽  
Mechanical Characteristics ◽  
Raw Materials ◽  
Saccharum Officinarum ◽  
Low Concentrations ◽  
Alternative Materials ◽  
Materials Used ◽  
Brazilian Standard ◽  
Physical And Mechanical Characteristics

In this research the aim was produce a particleboard with alternative materials and evaluated its physical and mechanical characteristics. The raw materials used are residues from sucarcane bagasse (SC) (Saccharum officinarum) and stem leaves of bamboo (B) (Dendrocalamus giganteus), bonded with a bi component adhesive based on castor oil. It was produced particleboards with five different traces: 100% SC, 75% SC+25% B, 50% SC+50% B, 25% SC +75%B and 100 % B. Their physical and mechanical characteristics were evaluated accordingly to Brazilian standard NBR 14810-3. Regarding the results obtained, it can be detached that for physical and mechanical evaluation it is evident a negative relation among the amount the sugarcane bagasse and their physical and mechanical characteristics, that is particleboards with low concentrations of sugarcane bagasse had better results. However all particleboards could be recommended for use as sealing particleboards in the segment of civil construction.

INVESTIGATION OF THERMAL AND MATERIAL FIELDS INFL UENCE ON CHANGES OF PHYSICAL AND MECHANICAL CHARACTERISTICS OF CHALK FOR ASSESSMENT OF ITS WORKABILITY

2020 ◽  
Vol 2 (1) ◽  
pp. 247-263
Author(s):  
E.A. ERMOLOVICH ◽  
◽  
A.V. OVCHINNIKOV ◽  
Keyword(s):  
Energy Intensity ◽  
Mechanical Characteristics ◽  
Experimental Studies ◽  
Ultimate Shear Strength ◽  
Rock Destruction ◽  
Low Strength ◽  
Semi Solid ◽  
Increased Strength ◽  
Physical And Mechanical Characteristics

Experimental studies were performed and the dependences of the influence of thermal and material fields on the change in the following physical and mechanical characteristics of the chalk were established: density, the ultimate compressive strength, ultimate tensile strength, ultimate shear strength, elastic modulus, Poisson's ratio, and stickiness. The geomechanical and energy criteria characterizing the chalk workability are calculated: the coefficient of hardness, the indicator of the difficulty of rock destruction, the indicator of the difficulty of rock excavation, the energy intensity of digging and rock destruction. A classification of chalk by workability was developed, in which 5 categories of rocks are distinguished: I -soft chalk, of very low strength; II - dense semi-solid chalk, low strength; III - solid dense chalk of increased strength; IV - solid strong chalk; V - rocky chalk

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