Experimental Investigation on the Bond Behaviour of Basalt TRM Systems - Influence of Textile Configuration and Multi-Layer Application

2019 ◽  
Vol 817 ◽  
pp. 134-140 ◽  
Author(s):  
Giulia Misseri ◽  
Gianfranco Stipo ◽  
Stefano Galassi ◽  
Luisa Rovero
Keyword(s):  
Tensile Tests ◽  
Reinforcement Ratio ◽  
Fibre Reinforcement ◽  
Basalt Fibre ◽  
Bond Behaviour ◽  
Factors Affecting ◽  
Experimental Campaign ◽  
Definition Of ◽  
Bond Tests ◽  
Conservation Interventions

Textile Reinforced Mortars (TRM) include a series of innovative strengthening systems suitable for conservation interventions since inorganic matrixes, instead of polymeric resins, are employed. Recent research supported the definition of guidelines on testing methods for TRM systems applied to masonry, but further investigation is needed to clear out the role played by the numerous factors affecting the strengthening capacity. In this study, an experimental campaign on basalt-fibre TRM systems was carried out. A series of tensile and single-shear bond tests are compared. Samples differ for fibre reinforcement ratio, textile layout and the number of textile layers, while the lime-based mortar matrix is the same for all specimens. For tensile tests, results show that, after a mortar-cracking phase, a third, substantially linear phase, during which the textile response is dominant, occurred for specimens failed both for textile tensile rupture and textile slippage. For shear bond tests, results showed that increasing the reinforcement ratio tightening textile mesh is not as beneficial as increasing textile layers, i.e. active bond surfaces.

The methodology of experimental research of the feed components extrusion process in order to improve its energy performance

2020 ◽  
pp. 147-152
Author(s):  
E. M. Ratnikov ◽  
D. O. Milko
Keyword(s):  
Experimental Studies ◽  
Energy Performance ◽  
Extrusion Process ◽  
Mathematical Methods ◽  
Screw Extruder ◽  
Mathematical Planning ◽  
Factors Affecting ◽  
Extrusion Processing ◽  
Definition Of

Annotation Purpose. Development of a program and methods for conducting experimental studies of the extrusion process with the definition of parameters and modes of operation of the extruder to improve its energy performance. Methods. Methods of mathematical statistics, synthesis, analysis, description and modeling were used. Results. The application of mathematical methods, in particular mathematical planning, reduces the number of experiments several times, and allows to evaluate the role of influencing factors, obtain a mathematical model of the process and determine the optimal conditions for its parameters and modes, etc. Conclusions. The methodology for experimental studies of a screw extruder is presented with the necessary equipment and methodology for processing the obtained experimental data. A mathematical method of planning, which reduces the number of experiments several times, allows us to evaluate the role of factors affecting productivity and energy intensity is presented. Keywords: extruder, auger, nutrients, research methodology, extrusion, processing, feed.

scholarly journals Bond Behaviour of Near-Surface Mounted Strips in RC Beams—Experimental Investigation and Numerical Simulations

Materials ◽  
2021 ◽  
Vol 14 (16) ◽  
pp. 4362
Author(s):  
Renata Kotynia ◽  
Hussien Abdel Baky ◽  
Kenneth W. Neale
Keyword(s):  
Concrete Strength ◽  
Element Model ◽  
Steel Reinforcement ◽  
Reinforcement Ratio ◽  
Experimental Program ◽  
Fe Model ◽  
Bond Behaviour ◽  
Near Surface ◽  
Cfrp Laminates ◽  
Near Surface Mounted

This paper presents an investigation of the bond mechanism between carbon fibre reinforced polymer (CFRP) laminates, concrete and steel in the near-surface mounted (NSM) CFRP-strengthened reinforced concrete (RC) beam-bond tests. The experimental program consisting of thirty modified concrete beams flexurally strengthened with NSM CFRP strips was published in. The effects of five parameters and their interactions on the ultimate load carrying capacities and the associated bond mechanisms of the beams are investigated in this paper with consideration of the following investigated parameters: beam span, beam depth, longitudinal tensile steel reinforcement ratio, the bond length of the CFRP strips and compressive concrete strength. The longitudinal steel reinforcement was cut at the beam mid-span in four beams to investigate a better assessment of the influence of the steel reinforcement ratio on the bond behaviour of CFRP to concrete bond behaviour. The numerical analysis implemented in this paper is based on a nonlinear micromechanical finite element model (FEM) that was used for investigation of the flexural behaviour of NSM CFRP-strengthened members. The 3D model based on advanced CFRP to concrete bond responses was introduced to modelling of tested specimens. The FEM procedure presents the orthotropic behaviour of the CFRP strips and the bond response between the CFRP and concrete. Comparison of the experimental and numerical results revealed an excellent agreement that confirms the suitability of the proposed FE model.

scholarly journals Experimental Research on Bond Behaviour of Fabric Reinforced Cementitious Matrix Composites for Retrofitting Masonry Walls

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Fayu Wang ◽  
Nicholas Kyriakides ◽  
Christis Chrysostomou ◽  
Eleftherios Eleftheriou ◽  
Renos Votsis ◽  
...  
Keyword(s):  
Large Scale ◽  
Tensile Tests ◽  
Seismic Resistance ◽  
Matrix Composites ◽  
Bond Behaviour ◽  
Cementitious Matrix ◽  
The Matrix ◽  
Rc Frame Buildings ◽  
Direct Tensile ◽  
Fabric Reinforced Cementitious Matrix

AbstractFabric reinforced cementitious matrix (FRCM) composites, also known as textile reinforced mortars (TRM), an inorganic matrix constituting fibre fabrics and cement-based mortar, are becoming a widely used composite material in Europe for upgrading the seismic resistance of existing reinforced concrete (RC) frame buildings. One way of providing seismic resistance upgrading is through the application of the proposed FRCM system on existing masonry infill walls to increase their stiffness and integrity. To examine the effectiveness of this application, the bond characteristics achieved between (a) the matrix and the masonry substrate and (b) the fabric and the matrix need to be determined. A series of experiments including 23 material performance tests, 15 direct tensile tests of dry fabric and composites, and 30 shear bond tests between the matrix and brick masonry, were carried out to investigate the fabric-to-matrix and matrix-to-substrate bond behaviour. In addition, different arrangements of extruded polystyrene (XPS) plates were applied to the FRCM to test the shear bond capacity of this insulation system when used on a large-scale wall.

scholarly journals Chloride Diffusion Property of Hybrid Basalt–Polypropylene Fibre-Reinforced Concrete in a Chloride–Sulphate Composite Environment under Drying–Wetting Cycles

Materials ◽  
2021 ◽  
Vol 14 (5) ◽  
pp. 1138
Author(s):  
Yang Luo ◽  
Ditao Niu ◽  
Li Su
Keyword(s):  
Reinforced Concrete ◽  
Coupling Effect ◽  
Early Stage ◽  
Polypropylene Fibre ◽  
Chloride Diffusion ◽  
Fibre Reinforcement ◽  
Fibre Reinforced Concrete ◽  
Basalt Fibre ◽  
Diffusion Property ◽  
Chloride Attack

The effect of fibre reinforcement on the chloride diffusion property of concrete is controversial, and the coupling effect of sulphate erosion and drying–wetting cycles in marine environments has been neglected in previous studies. In this study, the chloride diffusion property of hybrid basalt–polypropylene fibre-reinforced concrete subjected to a combined chloride–sulphate solution under drying–wetting cycles was investigated. The effects of basalt fibre (BF), polypropylene fibre (PF), and hybrid BP–PF on the chloride diffusion property were analysed. The results indicate that the presence of sulphate inhibits the diffusion of chloride at the early stage of erosion. However, at the late stage of erosion, sulphate does not only accelerate the diffusion of chloride by causing cracking of the concrete matrix but also leads to a decrease in the alkalinity of the pore solution, which further increases the risk of corrosion of the reinforcing steel. An appropriate amount of fibre can improve the chloride attack resistance of concrete at the early stage. With the increase in erosion time, the fibre effectively prevents the formation and development of sulphate erosion microcracks, thus reducing the adverse effects of sulphate on the resistance of concrete to chloride attack. The effects of sulphate and fibre on the chloride diffusion property were also elucidated in terms of changes in corrosion products, theoretical porosity, and the fibre-matrix interface transition zone.

THE PROBLEMS OF THE INVESTIGATOR’S FORENSIC THINKING FORMATION

2021 ◽  
pp. 68-73
Author(s):  
Руслан Юрьевич Павлов
Keyword(s):  
Cognitive Abilities ◽  
Educational Process ◽  
Criminal Cases ◽  
Factors Affecting ◽  
Factors Associated ◽  
Personal Qualities ◽  
Definition Of ◽  
The Impact ◽  
Objective Investigation

Актуальность статьи связана с поиском новых способов и методов повышения эффективности борьбы с преступностью, оперативного раскрытия преступлений, а также с набирающим популярность среди криминалистов направлением «криминалистического мышления», овладение навыками которого будет способствовать наиболее полноценному и объективному расследованию уголовных дел. Проблемным в настоящее время является недостаточное качество следствия и необходимость повышения когнитивных способностей следователей (дознавателей). Задачей исследования являлось выявление факторов, влияющих на развитие и формирование криминалистического мышления следователей. Цель работы - провести анализ составных частей процесса становления следователя и особенностей его практической деятельности, влияющих на когнитивные способности с точки зрения криминалистики, путем изучения и сравнения имеющихся материалов по данной тематике. Анализу подвергнуты личностные качества следователя, особенности образовательного процесса и влияние опыта на результаты работы, а также факторы, сопутствующие следственной деятельности (организация труда, уровень стресса, нагрузки и т. д.). Результат проведенного исследования выражен в определении проблемных факторов, влияющих на формирование криминалистического мышления следователя (дознавателя) и возможных путей их преодоления, важности такого мышления, которое остается знанием, постоянно сориентированным в сторону практики. The relevance of the article is related to the search for new ways and methods to improve the effectiveness of the fight against crime, the prompt detection of crimes, as well as the trend of «forensic thinking», which is gaining popularity among criminalists, mastering the skills of which will contribute to the most complete and objective investigation of criminal cases. Problems at present are insufficient quality of investigation and the need to improve the cognitive abilities of investigators (inquirers). The task of the study was to identify factors that influence the development and formation of forensic thinking of investigators. The purpose of the work is- to analyze the components of the process of formation of an investigator and features of his practical activities affecting the cognitive abilities in terms of forensics by studying and comparing existing materials on this topic. The analysis is subjected to the personal qualities of an investigator, the peculiarities of the educational process and the impact of experience on the results of work, as well as factors associated with the investigative activity (organization of work, stress and stress levels, etc.). The result of the study is expressed in the definition of problematic factors affecting the formation of forensic thinking of an investigator (inquirer) and possible ways to overcome them, the importance of such thinking, which remains knowledge, constantly oriented towards practice

scholarly journals Comparative Analysis of Selected Factors Affecting Heating Costs of Schools in Selected Balkan Countries

2015 ◽  
Vol 8 (1) ◽  
pp. 61-84
Author(s):  
David Koppitz ◽  
Milan Půček ◽  
František Ochrana ◽  
Michal Plaček
Keyword(s):  
Comparative Analysis ◽  
Fiscal Federalism ◽  
Public Policies ◽  
School Facilities ◽  
Factors Affecting ◽  
Effective Implementation ◽  
Balkan Countries ◽  
Definition Of

Abstract The paper aims to carry out a comparative analysis of heating of school facilities under the administration of municipalities in Macedonia, Moldova and Kosovo and to test the factors that affect the heating costs of school facilities. For a definition of the theoretical fundament parts of the theory of fiscal federalism are used. Subsequently five hypotheses are put forward that are verified using the method of benchmarking. The theoretical conclusions and recommendations may be used for a more effective implementation of public policies within the surveyed countries.

scholarly journals Tensile Testing with Cyclic Strain Holding to Analyze Dynamic Recrystallization of Pure Lead

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Mayu Muramatsu ◽  
Motomichi Koyama ◽  
Ikumu Watanabe
Keyword(s):  
Dynamic Recrystallization ◽  
Tensile Testing ◽  
Cyclic Strain ◽  
Tensile Tests ◽  
Pure Lead ◽  
Factors Affecting ◽  
Before And After ◽  
Dynamic Recrystallization Behavior ◽  
The Difference ◽  
Strain Responses

We analyzed the dynamic recrystallization of pure lead by tensile testing with cyclic strain holding at room temperature. The specimens were held at an identical strain and subsequently reloaded, providing the strength before and after the strain holding process. The difference in strength enables factors affecting dynamic recrystallization behavior to be analyzed through mechanical testing. For instance, the effects of strain rate on dynamic recrystallization were analyzed by comparing the results obtained from tensile tests with and without strain holding. This experimental technique demonstrated some parts of contribution of elastic strain, dynamic recovery, dynamic recrystallization, and necking to stress-strain responses.

scholarly journals АНАЛІЗ СПІВРОБІТНИКІВ КОМПАНІЇ ЯК НОСІЇВ КОРПОРАТИВНОЇ КУЛЬТУРИ

2019 ◽  
Vol 125 (4) ◽  
pp. 62-68
Author(s):  
Олена Миколаївна Афанасьєва ◽  
Валерія Вячеславівна Кошарна
Keyword(s):  
Staff Development ◽  
Corporate Culture ◽  
Social Life ◽  
Wide Spectrum ◽  
Equity Capital ◽  
Key Factors ◽  
Factors Affecting ◽  
Remuneration Policy ◽  
Business Structures ◽  
Definition Of

The paper explores the key factors affecting the corporate culture formation and development. Recently, the issues of corporate culture, especially in large organizations, trigger the focused attention of a number of management theorists and practitioners. It is a relatively new and insufficiently researched concept, both in this country and abroad. People make the foundation of any company, conversely any organization directs its activities towards a person fostering a multifaceted diversity of organizational culture brought in by each employee. This wide spectrum of variety is shaped by the uniqueness of each individual. Each person’s genetic background is exceptional which stems from people’s diversity of the universe. Ukrainian national individualism specified by the nature of social life plays a dual role in building a corporate culture domain of domestic business structures. Given the equity capital formation under the indirect ownership-based principle of “from individual to collective”, this feature of a national character contributes to corporate philosophy tailoring. The paper suggests a definition of the “corporate culture” concept as a set of values, beliefs, opinions, perceptions, expectations, symbols as well as behavior norms and patterns, traditions, rituals, etc. that have developed in the organization or its divisions during its life cycle and which are accepted by the majority of employees. The system of leadership based on encouraging practices is proved to be most effective. Diligent, initiative performance of management instructions, hard creative work in this case depend on the remuneration policy. Thus, incentives should be meaningful for a performer and feasible for a firm. Insights to a range of theoretical and practical aspects in building employee’s corporate culture are provided. The personnel particular role in facilitating the enterprise performance efficiency is revealed. The paper verifies the need to implement coaching in terms of effective training practices for staff development.

scholarly journals The Factors affecting the implementation of electronic training in health care organization in Saudi Arabia: The case of King Abdulaziz university hospital: العوامل المؤثرة في تطبيق التدريب الإلكتروني في المنظمات الصحية- دراسة تطبيقية على موظفي مستشفى جامعة الملك عبد العزيز الإداريين بالمملكة العربية السعودية

2019 ◽  
Vol 3 (10) ◽  
Author(s):  
Sabah Abdullah Alsomali  ,   Amira AbdulAziz Alghamdi
Keyword(s):  
Health Care Organization ◽  
General Information ◽  
University Hospital ◽  
Care Organization ◽  
Health Organizations ◽  
Factors Affecting ◽  
King Abdulaziz University ◽  
Definition Of ◽  
Study Hypothesis ◽  
Significant Factors

The current study focused on the definition of electronic training and the importance of electronic training in the health organizations. The study main objective was to study the most significant factors that are affecting the electronic training application in the health organizations. The researcher used both a descriptive and analytical methods in her study. A questionnaire was used as a tool for data collection; the questionnaire was divided into two sections. The first section contained questions about general information that included: sex – age- qualification – experience in years – computer skills. The second section dealt with questions related to the study hypothesis. This section consists of four parts as follows: The first part included 11 statements about the reality of the electronic training in the health organizations in the present, which is considered the dependent variable in this study. The second part consists of 15 statements; the third part consists of 13 statements. The fourth part consists of 8 statements. These parts addressed the most significant factors that affected the implementation of the electronic training in the health organizations. These were the independent variables of the study. The questionnaire was distributed to a study sample of (368) employee in the hospital. A (200) questionnaire were collected on a rate of 54%. The Results of the study showed that the infrastructure for the Information technology and the government's tends towards the digital society were the most important factors that primarily affect the possibility of applying the electronic training in the health organizations. The main recommendations of the study were: the need for a support from the high and senior management in the king Abdul Aziz University hospital to adopt the electronic application of the electronic training and manage the resistance of change that many organization faces. The necessity of the electronic training for all the staff on computers skills. Finally, the importance of having a unit for the technical support king Abdul Aziz University hospital.

scholarly journals Model of the co-operative trade alliance for independent retail networks in Czech Republic

2011 ◽  
Vol 59 (2) ◽  
pp. 377-384
Author(s):  
Marek Záboj
Keyword(s):  
Czech Republic ◽  
Trade Negotiation ◽  
Factors Affecting ◽  
Regional Market ◽  
Fast Moving Consumer Goods ◽  
Definition Of ◽  
Common Trade ◽  
The Given ◽  
Retail Formats ◽  
Transnational Trade

The main objective of the contribution is proposal of the model of co-operative trade alliance for independent trade alliances with fast-moving consumer goods (FMCG) in Czech Republic. Reason of the choice of this topic is sustain of variety of retail formats in Czech market in connection with position small and medium sized trade firms in comparison with transnational trade chains. Independent trade firms face to much bigger competitors operating supermarkets and hypermarkets, namely not even in size of sales area, width and depth of the assortment but also in possibility of negotiation of more profitable trade conditions with their suppliers. Effort of these independent trade firms, which operate mostly just in local or maximally regional market, is then mutual co-operation in form of consumer co-operatives, associations, alliances and networks. These groupings then mainly through common trade negotiation and purchase get for much more advantageous delivery and payment conditions from their suppliers. Besides they can participate in mutual financing of using of promotion instruments. Partial aim of the paper is investigation of opinion and willingness of Czech trade alliances with FMCG to utilize the opportunity of mutual co-operation in common trade alliance. Next partial goal is identification of the factors affecting formation of joint co-operative grouping and its structure, eventually definition of entry conditions which should be fulfilled by individual members.The system approach will be used to realize the given objective. This approach appears as the most suitable in consideration of anticipated structure and character of supposed model. The result will be then proposal of model of mutual co-operation between individual trade alliances.

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