scholarly journals Scientific basis of design structures plaster solutions

2019 ◽  
Vol 1 (52) ◽  
pp. 160-165
Author(s):  
Valentyn Paruta ◽  
Olha Gnyp ◽  
Leonid Lavreniuk ◽  
Bachinsky Vyacheslav Bachinsky Vyacheslav ◽  
Iryna Grynyova
Keyword(s):  
Working Conditions ◽  
Mechanical Characteristics ◽  
Scientific Basis ◽  
Fine Aggregate ◽  
Polymer Fiber ◽  
Volume Increase ◽  
High Rise ◽  
Low Modulus ◽  
Wall Materials ◽  
Water Holding

High-rise construction volume increase and new wall materials use require changing the approach to the design of plastermortar compositions. The analysis has showed that it is possible to reduce the number of cracks in the plaster coating by increasingthe water holding capacity of the mortar mixture. To optimize the prescription parameters of the mortar mixture, thefive-factor experiment with fine aggregate and the filler with a low modulus of elasticity, disperse polymeric powders andcellulose ethers, a polymer fiber for microdispersed reinforcement has been used. The obtained data indicate that the proposedapproach enables to obtain plaster mortars with physic mechanical characteristics that provide optimal working conditions“masonry - plaster coatings”.

scholarly journals НАУЧНЫЕ ОСНОВЫ ПРОЕКТИРОВАНИЯ СОСТАВОВ ШТУКАТУРНЫХ РАСТВОРОВ

2019 ◽  
Author(s):  
V. Paruta ◽  
O. Gnyp ◽  
L. Lavrenyuk ◽  
V. Bachinsky ◽  
I. Grynyova
Keyword(s):  
Mechanical Characteristics ◽  
Bending Strength ◽  
Scientific Basis ◽  
Wall Structure ◽  
Regulatory Requirements ◽  
High Rise ◽  
Destruction Mechanism ◽  
Wall Materials ◽  
Water Holding ◽  
Physical And Mechanical Characteristics

Увеличение объемов высотного строительства, применение новых стеновых материалов требует переосмысления подхода к проектированию составов штукатурных растворов. Это вызвано тем, что нагрузки на штукатурное покрытие, находящееся на 1 или 24 этажах здания, значительно отличаются. Решить поставленную задачу в рамках существующих представлений, принципов и нормативных требований невозможно, так как они применимы для растворов, применяемых при малоэтажном строительстве. Для достижения поставленной цели в данной статье разработана научная основа проектирования составов штукатурных растворов для высотных зданий. А для этого проведен анализ процессов, протекающих в штукатурном покрытии при его нанесении и твердении, механизма разрушения системы кладка штукатурное покрытие . Выявлены и проанализированы на примерах и графиках основные причины развития трещин, такие как температурные и влажностные деформации штукатурного покрытия и кладки и их разность, напряжения, вызванные ими, воздействие влаги, льда и агрессивных веществ. Для того чтобы предотвратить разрушение штукатурного покрытия, рассчитали величины физико-механических характеристик (прочность при сжатии и изгибе, модуль упругости и др.), с учетом напряжений в нем и контактной зоне с кладкой, возникающие при твердении раствора и деформации стеновой конструкции. Сформулированы принципы и критерии, при которых будет обеспечена долговечность штукатурного покрытия и стеновой конструкции. Рекомендованы составляющие и подобраны два состава раствора, которые позволили увеличить водоудерживающую способность смеси, уменьшить усадку штукатурного покрытия при твердении, уменьшить количество трещин, возникающих при твердении, и предотвратить или замедлить их развитие.The increase the volume of the high-rise construction, the use of new wall materials, requires a rethinking of the approach to the design of plaster mortar compositions. This is due to the fact that the load on the plaster coating, located on the 1 or 24 floors of the building, are significantly different. To solve the problem within the framework of existing concepts, principles and regulatory requirements is not possible, as they are applicable to solutions used in low-rise construction. To achieve this goal, the scientific basis for the design of plaster mortar compositions for high-rise buildings was developed in this article. An analysis of the processes occurring in the plaster coating during its application and hardening, the destruction mechanism of the system masonry - plaster coating was carried out. The main reasons for the development of cracks, such as temperature and moisture deformations of the plaster coating and masonry and their difference, the stresses caused by them, exposure to moisture, ice and aggressive substances, were identified and analyzed using examples and graphs. In order to prevent the destruction of the plaster coating, the values of physical and mechanical characteristics (compressive and bending strength, elastic modulus, etc.) were calculated, taking into account the stresses in it and the contact zone with the masonry, arising from the hardening of the mortar and the deformation of the wall structure. The principles and criteria are formulated under which the durability of the plaster coating and wall structure will be ensured. For two compositions of the mortar, which allowed to increase the water-holding ability of the mixture, reduce the shrinkage of the plaster coating during hardening, reduce the number of cracks that occur during hardening and prevent or slow down their development, the components were recommended and selected.

The Influence of the Structure on the Destruction Mechanism of Polymer-Cement Plaster Coating

2020 ◽  
Vol 864 ◽  
pp. 93-100
Author(s):  
Valentyn Paruta ◽  
Olga Gnyp ◽  
Leonid Lavrenyuk ◽  
Iryna Grynyova
Keyword(s):  
Contact Area ◽  
Modulus Of Elasticity ◽  
Wall Structure ◽  
Fine Aggregate ◽  
Polymer Fiber ◽  
Cellulose Ethers ◽  
Destruction Mechanism ◽  
Low Modulus

The article considers the influence of the structure of polymer-cement plaster coating on the nature of its destruction during the operation of the wall structure. It was shown that the use of purposefully selected components of the mixture (RPP, polymer fiber, cellulose ethers, fine aggregate with a low modulus of elasticity, etc.) made it possible to increase the uniformity of its structure and contact area with masonry, reduce the number of cracks during hardening, and slow down their development during operation, increase the durability of it and the wall structure. The durability of the wall structure largely depends on the number of defects in the plaster coating and the contact area between it and the masonry.

scholarly journals Sodium Metasilicate Cemented Analogue Material and Its Mechanical Properties

2016 ◽  
Vol 2016 ◽  
pp. 1-17 ◽  
Author(s):  
Songlin Yue ◽  
Yanyu Qiu ◽  
Pengxian Fan ◽  
Pin Zhang ◽  
Ning Zhang
Keyword(s):  
Complex Geometry ◽  
Sodium Metasilicate ◽  
Raw Material ◽  
Fine Aggregate ◽  
Regression Equations ◽  
Deformation And Failure ◽  
Orthogonal Experiments ◽  
Low Modulus ◽  
New Type ◽  
The Relationship

Analogue material with appropriate properties is of great importance to the reliability of geomechanical model test, which is one of the mostly used approaches in field of geotechnical research. In this paper, a new type of analogue material is developed, which is composed of coarse aggregate (quartz sand and/or barite sand), fine aggregate (barite powder), and cementitious material (anhydrous sodium silicate). The components of each raw material are the key influencing factors, which significantly affect the physical and mechanical parameters of analogue materials. In order to establish the relationship between parameters and factors, the material properties including density, Young’s modulus, uniaxial compressive strength, and tensile strength were investigated by a series of orthogonal experiments with hundreds of samples. By orthogonal regression analysis, the regression equations of each parameter were obtained based on experimental data, which can predict the properties of the developed analogue materials according to proportions. The experiments and applications indicate that sodium metasilicate cemented analogue material is a type of low-strength and low-modulus material with designable density, which is insensitive to humidity and temperature and satisfies mechanical scaling criteria for weak rock or soft geological materials. Moreover, the developed material can be easily cast into structures with complex geometry shapes and simulate the deformation and failure processes of prototype rocks.

Experimental Study about Testing Masonry Shear Strength with Drilled Core Method

2012 ◽  
Vol 166-169 ◽  
pp. 1241-1244
Author(s):  
Shi Qi Cui ◽  
Xu Wen Kong ◽  
Xin Wang ◽  
Ming Liang Yang
Keyword(s):  
Shear Strength ◽  
Scientific Basis ◽  
Core Sample ◽  
Masonry Structure ◽  
Data Regression ◽  
Drilling Method ◽  
Testing Data ◽  
Wall Materials ◽  
Result Analysis ◽  
The Relationship

Key technology of testing masonry shear strength with core drilling method is that standard shear strength of masonry is determined from the shear strength of masonry core sample, while current code or specification has not provided the corresponding calculating formula. To investigate their relationship, a series of tests have been carried out. Existing test result analysis shows that standard shear strength of masonry and shear strength of masonry core sample are closely related. By means of testing data regression analysis, this work can establish the relationship formula between shear strength of single core sample and standard shear strength of masonry. This Technology can be suitable both to traditional masonry structure and to new wall materials masonry structure, especially to seismic appraiser and reinforcement calculation of masonry structure. This technology can support scientific basis to quality examination and assessment of new wall materials and analysis of engineering quality accident.

scholarly journals Designing plaster mortar for a high-rise building

2019 ◽  
Vol 13 (4) ◽  
pp. 331-336
Author(s):  
Zeljko Kos ◽  
Valentyn Paruta ◽  
Olga Gnyp ◽  
Leonid Lavrenyuk ◽  
Iryna Grynyova
Keyword(s):  
Maximum Level ◽  
Scientific Basis ◽  
Coating System ◽  
Mechanical Parameters ◽  
Regulatory Requirements ◽  
High Rise ◽  
High Rise Building

The article rethinks the approach to the development of compositions of plaster mortar as the load on the plaster coating located on the 1st or 24th floor of the building differs significantly. To solve the problem within the framework of existing concepts, principles and regulatory requirements are not possible, as they are applicable to the solutions used in low-rise building. To achieve this goal, it is necessary to develop the scientific basis for the design of plaster mortar. In order to do that, it is necessary to analyze the processes occurring in the plaster coating when it is applied and hardened, the knowledge of the mechanism of the destruction of the "masonry - plaster coating" system, and the calculation and evaluation of stresses. The designated physical and mechanical parameters and the selected plaster mortar compositions should ensure the "work" of the system at the maximum level of such stresses.

Design of Low-Voltage Power Distribution System

2013 ◽  
Vol 791-793 ◽  
pp. 1889-1891
Author(s):  
Yan Li Fan ◽  
Qing En Li
Keyword(s):  
Power System ◽  
Power Distribution ◽  
Distribution System ◽  
Low Voltage ◽  
Electrical Power ◽  
Scientific Basis ◽  
Voltage Distribution ◽  
Electrical Power System ◽  
Power Distribution System ◽  
High Rise

The low-voltage distribution system is the key component of the electrical power system. Some analysis and research of the low-voltage distribution system is carried out in this paper, which provides some scientific basis to design the low-voltage distribution system. Firstly, the summarize of low-voltage distribution system is taken. The influence to productions and livings of low-voltage distribution system is introduced. Secondly, the mode of connection and design philosophy of low-voltage distribution system is studied in detail, especially the high-rise buildings low-voltage distribution system is concluded and summarized.

Study on Different Diameter Porous Steel Slag to Early Cracking Resistance of Concrete by Internal Curing

2014 ◽  
Vol 599 ◽  
pp. 78-83 ◽  
Author(s):  
Pan Liu ◽  
Ke Bin Shi ◽  
Lin Lin Zhang
Keyword(s):  
Water Retention ◽  
Steel Slag ◽  
Internal Curing ◽  
Fine Aggregate ◽  
Cracking Resistance ◽  
Blank Group ◽  
Internal Relative Humidity ◽  
Edge Method ◽  
Water Holding ◽  
Better Than

In order to solve the serious question of early cracking of concrete in drying environment in the western of china. Using the same volume steel slag substituting fine aggregate (coarse aggregate) to mixing concrete with its porous characteristics, which are carried out by the knife-edge method. The result shows that: the compressive strength of steel slag concrete is better than the blank group at 7d and 28d ages;The Water holding capacity, the time of early cracking of concrete is delayed, the width and area of crack is significantly reduced with the increase of steel slag in same water-cement ratio. Simultaneously, the water retention and the crack resistance of concrete using steel slag stone is better than concrete using steel slag sand in same dosage. The porous steel slag can improve the internal relative humidity of concrete, restrain the early shrinkage of steel slag concrete, and help to improve early cracking resistance of concrete from the view of internal curing.

Senile Coconut Palm Hierarchical Structure as Foundation for Biomimetic Applications

2014 ◽  
Vol 553 ◽  
pp. 344-349 ◽  
Author(s):  
O.M. Gonzalez ◽  
Benoit P. Gilbert ◽  
H. Bailleres ◽  
Hong Guan
Keyword(s):  
Density Distribution ◽  
Hierarchical Structure ◽  
Triple Helix ◽  
Mechanical Characteristics ◽  
Weather Conditions ◽  
Scientific Basis ◽  
Coconut Palm ◽  
Characteristic Radius ◽  
First Time ◽  
Stem Structure

Superior to hardwood and softwood trees, coconut palms are able to withstand extreme weather conditions without failure. Previous studies have shown that the internal structure of coconut palm stems significantly differs from hardwood, softwood and even other palm stems, in terms of fibre orientation and density distribution, likely influencing the mechanical characteristics of the tree. This paper aims at quantifying the cocowood hierarchical structure at an integral level (stem structure). To achieved this, quantitative analysis of more than 40 senile coconut palms from Fiji and Samoa has been carried out. This paper defines and analyses the typical cocowood morphology (form-structure) in terms of such factors as characteristic radius, fibrovascular bundles orientation and density distribution. For the first time, the characteristic triple helix configuration traced out by the fibrovascular bundles within the cocowood structure is modelled for the whole coconut stem. Specific equations are proposed to determine these factors at any given position in the tree. Knowledge advanced from this study will provide a scientific basis for future cocowood biomechanics research, including finite element modelling and analysis for biomimetic engineering applications.

scholarly journals The Effect of Twisted Polymer Fiber on Physical and Mechanical Characteristics of Concrete C35

2018 ◽  
Vol 14 (1) ◽  
pp. 126-135
Author(s):  
Reza Mirzaei ◽  
Naser Zarifmoghaddam
Keyword(s):  
Tensile Strength ◽  
Reinforced Concrete ◽  
Modulus Of Elasticity ◽  
Mechanical Characteristics ◽  
Fiber Reinforced Concrete ◽  
Polymer Fiber ◽  
New Materials ◽  
Concrete Mix ◽  
Physical And Mechanical Characteristics

 Concrete as the most used material, is known as an integral part of construction. So far, many studies have been done in the field of improving the quality of concrete that most of them have examined change in concrete mix which is called concrete mix plan. However, the use of additives and also replacing commonly used materials in concrete with new materials always has been noteworthy. In this study, description of tests that have been done on fiber reinforced concrete will be discussed. Also, the condition of concrete mix plan will be discussed. Comparison between results of the tests showed that Forta reinforced concretes have more compressive, flexural and tensile strength and modulus of elasticity than normal and ordinary concretes.Journal of the Institute of Engineering, 2018, 14(1): 126-135 

scholarly journals The effects of Mo, Cu, Mn on some physiological indexes of common bean variety NHPO4 at seedling stage

2019 ◽  
Vol 15 (3) ◽  
pp. 117
Author(s):  
Le Van Trong Trong ◽  
Bui Bao Thinh
Keyword(s):  
Common Bean ◽  
Water Content ◽  
Chlorophyll Content ◽  
Scientific Basis ◽  
Water Holding Capacity ◽  
Seedling Stage ◽  
Bean Variety ◽  
Physiological Indexes ◽  
The Common ◽  
Water Holding

This paper presents the results about effect of Mo, Cu, Mn to some physiological indexes of common bean variety NHP04 at seedling stage. The results showed that Mo, Cu and Mn affected water content in leaves, water holding capacity, transpiration intensity and chlorophyll content in leaves, in which Mo had the most effect. The results of this research can serve as scientific basis to enhance the tolerance and productivity of the common bean varieties and the plant.

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