scholarly journals EFFECT OF DRY DEFIBRATION OF RECOVERED PAPER ON MULTILAYER CARDBOARD PROPERTIES

2020 ◽  
pp. 251-260
Author(s):  
Tomas Shreinner ◽  
Haral'd Grossmann ◽  
Nikolay Petrovich Midukov ◽  
Viktor Sergeyevich Kurov ◽  
Aleksandr Semenovich Smolin
Keyword(s):  
Industrial Development ◽  
Paper Industry ◽  
Experimental Studies ◽  
Partial Replacement ◽  
Preparation Technique ◽  
Mechanical Parameters ◽  
Deformation Properties ◽  
Reduction Of Energy Consumption ◽  
Reduction Cost ◽  
Maximum Content

The article focuses on the relevant for the pulp and paper industry in the direction of reduction of energy consumption for the production of cardboard from recovered paper with the preservation of its mechanical parameters. The reduction cost is due to the partial replacement of the technology of traditional conventional preparation of the recovered paper with dry defibration. The dry defibration method affects the structural, mechanical and deformation properties of the cardboard. The purpose of the work is to obtain dependencies, listed characteristics on recovered paper content prepared by dry method. In order to maintain the mechanical and deformation properties of the cardboard when adding dry-defibrated fibers, it is necessary to correctly distribute them in the test liner layers and to set the stage of supply of dry-defibrated recovered paper into the process flow. To this end, various applications of the dry recovered paper preparation technique were experimentally analyzed, fed to and ground in an aqueous medium, and dry fibers were used to form a two-layer and three-layer test-liner cardboard. The maximum content of fibers prepared by the dry method to obtain a multilayer test-liner was 50% by weight of the cardboard, even though the main mechanical parameters, including tensile strength, bending stiffness, and short-span compression strength (SCT), changed slightly. Established optimal composition of cardboard, allowed using the results of experimental studies for industrial development. The article also provides a technical and economic estimation of different ways of dry defibration technology.

Experimental Studies of Fiber-Reinforced Concrete under Axial Tension

2021 ◽  
Vol 1038 ◽  
pp. 323-329
Author(s):  
Zlata Holovata ◽  
Daria Kirichenko ◽  
Irina Korneeva ◽  
Stepan Neutov ◽  
Marina Vyhnanets
Keyword(s):  
Reinforced Concrete ◽  
Experimental Studies ◽  
Fiber Reinforced Concrete ◽  
Load Application ◽  
Fiber Reinforced ◽  
Large Aggregate ◽  
Second Stage ◽  
Axial Tension ◽  
Deformation Properties ◽  
Fiber Concrete

The design of a stand for testing concrete and fiber-reinforced concrete specimens-"eight" in tension, which provides axial load application and minimizes the effect of stress concentration at the ends of the specimen. The design of the stand is such that the distance between the axis of load application and the central hinge is 108 cm, and between this hinge and the axis of the test specimen is 21 cm, as a result of which the load transferred to the specimen is 5.143 times greater than the applied one. At the first stage of testing, it was found that the optimal characteristics of the fiber-concrete mixture is a matrix with a large aggregate ≤ 10 mm with 1.0% fiber reinforcement. At the second stage, the ultimate strength of fiber-reinforced concrete for axial tension was determined - 1.28 MPa when reinforced with wave fiber and 1.37 MPa when reinforced with anchor fiber, which amounted to 4.1% and 4.4% of compressive strength, respectively. It was also found that concrete reinforced with anchor fiber has higher deformation properties than concrete reinforced with wave fiber.

Studies of Magnetically Active Silicone Elastomers on a Vibrostend

2021 ◽  
Vol 1037 ◽  
pp. 141-147
Author(s):  
Andrey Minaev ◽  
Juri Korovkin ◽  
Hammat Valiev ◽  
G.V. Stepanov ◽  
Dmitry Yu. Borin
Keyword(s):  
Magnetic Field ◽  
Field Effect ◽  
Dynamic Properties ◽  
Experimental Studies ◽  
Magnetic Field Effect ◽  
Magnetorheological Elastomer ◽  
Silicone Elastomers ◽  
Damping Coefficients ◽  
Deformation Properties ◽  
The Magnetic Field

Experimental studies magnetorheological elastomer specimens dynamic properties under the magnetic fields action on the vibrostend are carried out. Amplitude-frequency characteristics have been obtained. The magnetic field effect on the silicone magnetoreactive elastomers deformation properties and damping coefficients experimentally is established.

scholarly journals Experimental Studies on Durability Studies of Concrete with Partial Replacement of Cement by Water Hyacinth Ash

2018 ◽  
Vol 7 (3.35) ◽  
pp. 22
Author(s):  
V. Murugesh ◽  
Dr. N. Balasundaram ◽  
Dr. T. Senthil Vadivel
Keyword(s):  
Water Hyacinth ◽  
Rice Husk Ash ◽  
Experimental Studies ◽  
Partial Replacement ◽  
Absorption Property ◽  
Test Results ◽  
Acid Attack ◽  
Conventional Concrete ◽  
Egg Shell ◽  
Shell Powder

Cement is the main constituent ingredient in concrete. Now days many investigations undergone for substitute of cement due to green houses effect and global warming  .Many new products like rice husk ash, egg shell powder, baggage ash, etc are used as an effluent replacement material for cement. The new and Practical material for substitute of cement is water hyacinth ash .Water hyacinth ash (WHA), is used as an effectual replacement of partial cement, and it has been proved in several characteristics of concrete. The main important parameters in concrete are strength, durability and workability. In this paper, 10 % of cement replaced by water hyacinth ash   to investigate the effects of WHA on  durability and Strength  in concretes. On this basis, specimens were engrossed in water and acid to study the absorption property, acid attack and compared to conventional concrete. The test results show that replacement of cement by WHA in concrete has improved the parameters of concrete. 

Effect of the Slope on the Undrained Bearing Capacity of Shallow Foundation

2017 ◽  
Vol 28 ◽  
pp. 32-44 ◽  
Author(s):  
Messaoud Baazouzi ◽  
Mekki Mellas ◽  
Abdelhak Mabrouki ◽  
Djamel Benmeddour
Keyword(s):  
Numerical Analysis ◽  
Bearing Capacity ◽  
Experimental Studies ◽  
Strip Footing ◽  
Shallow Foundation ◽  
Mechanical Parameters ◽  
Vertical Load ◽  
Lagrangian Analysis ◽  
Major Interest ◽  
Explicit Finite Difference

The bearing capacity of shallow foundation near slope has always been one of the subjects of major interest in geotechnical engineering for researchers and practical engineers. This study focuses on the numerical analysis of the undrained bearing capacity for a strip footing near a slope, and subjected to a centered vertical load, using the explicit finite difference code FLAC (Fast Lagrangian Analysis of Continua). Theoretical and experimental studies confirm that, when a strip footing is near a slope, the bearing capacity must be assessed using reduction coefficients. In this study, several geometrical and mechanical parameters have been considered in order to evaluate the effect of the slope on the undrained bearing capacity. The numerical values have been compared with those available in the literature. The results show the influence on the undrained bearing capacity of the location of the footing with respect to the slope.

scholarly journals Durability Properties of concrete incorporating calcined Phyllite

2021 ◽  
Author(s):  
DALPAT CHUNDAWAT ◽  
DINESH SHARMA ◽  
Sandeep Tomar
Keyword(s):  
Ball Mill ◽  
Laboratory Tests ◽  
Metamorphic Rock ◽  
Underground Mining ◽  
Chloride Ion ◽  
Partial Replacement ◽  
Basic Medium ◽  
Chloride Ion Penetration ◽  
Strength And Durability ◽  
Maximum Content

The environmental and economic concern is the biggest challenge that concrete industry is facing today. Advancement in utilization of wastes in concrete as a mixture reduces usage of natural resources. Phyllite is a kind of foliated metamorphic rock generates during underground mining .Phyllite was calcined at 850 to 900oC in furnace and ground in ball mill. In this study, cement was partially replaced by weight with calcined phyllite to make M30 grade of concrete with 0% (Control mix), 2%, 4%, 6%, 8%, & 10%, (which are designated as M1, M2, M3, M4, M5 and M6). The laboratory tests such as slump value, compressive strength, flexural strength, water absorption, chloride ion penetration and durability in acidic and basic medium were conducted on the phyllite concrete and results are compared with the control mix. Through results it is concluded that cement can be replaced in concrete at the tune of 8% with Calcine Phyllite (CP) without affecting the strength and durability. The aim of the experiment is to find the maximum content of mines calcined Phyllite that can be used as a partial replacement of cement without compromising the quality on any of the characteristics of concrete.

scholarly journals Impact performance of rubber reinforced concrete with waste steel fibres

2021 ◽  
Vol 1205 (1) ◽  
pp. 012008
Author(s):  
M Drdlova ◽  
P Bibora ◽  
V Prachar
Keyword(s):  
Energy Absorption ◽  
High Performance ◽  
High Performance Concrete ◽  
Impact Resistance ◽  
Partial Replacement ◽  
Mechanical Parameters ◽  
Rubberized Concrete ◽  
Steel Fibres ◽  
Impact Performance ◽  
New Material

Abstract This study introduces cementitious composite with rubber granulate and waste steel fibres as a new material for construction industry with an enhanced energy absorption capability and impact toughness. Detailed research on physico-mechanical properties of high-performance concrete with waste steel fibres and partial replacement of the aggregates by rubber granulate was performed, with emphasis on impact energy absorption potential. Different aggregate replacement ratios (0–30% wt.) and fibre amount (0–3% wt.) were investigated. The influence of rubber sizes, rubber content and steel fibre content on the mechanical parameters of the rubberized concrete at both quasistatic and dynamic loads was evaluated and discussed. With increasing amount of rubber granulate, the concrete suffered from reduction of its mechanical parameters – compressive and flexural strength, however the energy dissipation capability showed rising trend. This study demonstrated the potential of rubberized concrete with waste steel fibres for use in structures with higher impact resistance requirements.

scholarly journals Experimental research of the module for gathering plant of chicory roots

2021 ◽  
Vol 1 (101) ◽  
pp. 56-67
Author(s):  
Eugene Berezhenko ◽  
Maria Pankiv ◽  
Jan Jobbagy ◽  
Bogdan Berezhenko
Keyword(s):  
New Technologies ◽  
Experimental Studies ◽  
Specific Mass ◽  
Root Crops ◽  
Scientific Task ◽  
Yield Capacity ◽  
Reduction Of Energy Consumption ◽  
Experimental Values ◽  
Chicory Roots ◽  
Plant Harvesting

Reduction of energy consumption, which creates hygienic root crops, is achieved with the use of expanded boxes of new technologies and improved pick-up modules, which is an urgent scientific task. Tests of the energy-saving method of growing plants are given and what is more, the scheme of experimental installations (put into operation of the plant harvesting module) and the methods of experimental field factors used in roots have been provided. Analytical and empirical dependencies are obtained, which characterize the change of the second feed and the specific mass of the cut and chopped knife of the rotary saw cutter, depending on the velocity of the module, the yield capacity and the density of chicory root crops plantation. The specific mass of the plant harvested from 3 rows of root crops are, respectively, in the range from 17 to 36 (kg/s) and from 19 to 27 (kg/m2). The results of the experimental studies were processed using Statistics 10, the confidence level P = 0.95, the Fisher F-criterion F = 100.8> Frit and the t-alpha criterion t = 2.05. Based on the graphical constructions it was established that the discrepancy between theoretical and experimental values of the second feed and the specific gravity of the ridge ranges from 10 to 15 (%).

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