New Possibilities of Determining the Resistance of Cement Composite to Abrasion by Fast Flowing Water

The current view on the determination of the abrasion resistance of a cement composite is mainly focused on the resistance of the composite to the effects of mechanical abrasion. However, many concrete structures are exposed to the abrasive effects of flowing liquids. One of the test procedures simulating this principle of abrasion is based on the creation of a very fast flow of liquids, often including abrasive media. Based on worldwide published research on the given topic, the use of the action of ultrasonic waves in a liquid, leading to the simulation of the cavitation stress of a composite, which is a very dangerous phenomenon, is considered a suitable method for creating the mentioned abrasion effects. The following article discusses new possibilities for simulating and evaluating the abrasive effects of cavitation on cement composites using the action of ultrasonic waves in a liquid. These effects will be monitored on cement pastes, which will be modified with several types of commonly used admixtures. Furthermore, the connection between the effects of the mentioned abrasive action and several physical-mechanical parameters will be monitored.

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Synergistic Effect of High Temperature Fly Ash with Fluidized Bed Combustion Fly Ash in Cement Composites

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.722.113 ◽

2016 ◽

Vol 722 ◽

pp. 113-118

Author(s):

Martin Ťažký ◽

Rudolf Hela

Keyword(s):

High Temperature ◽

Fly Ash ◽

Fluidized Bed ◽

Fossil Fuels ◽

Cement Composite ◽

Pozzolanic Reaction ◽

Cement Composites ◽

Fluidized Bed Combustion ◽

Cement Pastes ◽

Free Cao

Using high temperature fly ash for his pozzolan properties to cement composite production is known a few years ago. New ways combustion of fossil fuels also creates a new type of fly ash, named fluidized bed combustion fly ash. However, this fly ash has same pozzolan properties as has high temperature fly ash, this type is not using for production of cement composites. Fluidized bed combustion fly ash has highly variable chemical composition but usually it has a higher amount of free CaO together with sulphates. This higher amounts of free CaO after mixing of fluidized bed combustion fly ash with water to some extent becomes an activator for the beginning of the pozzolanic reaction, during which is consumed the extinguished CaO. If there is also present high temperature fly ash in cement composite, it could be accelerated his pozzolanic reaction in the same manner using a fluidized bed combustion fly ash. In this experiment was tested a synergy effect in the use of fluidized bed combustion fly ash with high temperature fly ash as an additive. The experiment was carried out on cement pastes that have been studied in particular the progress of hydration processes, pointing to a possible acceleration of pozzolanic reactions of both types of fly ash.

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Monitoring of the Setting and early Hardening with Ultrasonic Waves

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.776.51 ◽

2018 ◽

Vol 776 ◽

pp. 51-54 ◽

Cited By ~ 3

Author(s):

Iva Rozsypalová ◽

Ondřej Karel ◽

Barbara Kucharczyková ◽

Dalibor Kocáb ◽

Romana Halamová

Keyword(s):

Test Specimen ◽

Ultrasonic Waves ◽

Ultrasonic Transducers ◽

Cement Composites ◽

Measurement Equipment ◽

Cement Pastes ◽

Innovative Method ◽

Measurement Results ◽

Measurement Principle ◽

Method Of Measurement

The paper deals with the experimental investigation aimed at the continual monitoring of the process of setting and early hardening in cement pastes and mortars using the measurement equipment Vikasonic. The measurement principle consists in measuring the time of ultrasonic pulses transit through a test specimen placed between two ultrasonic transducers. This innovative method of measurement could in the future suitably complement or, in some cases, completely substitute the measurement of setting in cement composites using the Vicat apparatus. The pilot measurement results performed on the cement pastes and mortars are presented in the paper.

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The Role and Place of Budget Procedure in the System

Voprosy Ekonomiki ◽

10.32609/0042-8736-2003-5-42-49 ◽

2003 ◽

pp. 42-49 ◽

Cited By ~ 1

Author(s):

E. Bushmin

Keyword(s):

Budget Process ◽

Public Expenditures ◽

Principal Role ◽

Process Trends ◽

The Given ◽

Rules Of The Game

The article is devoted to the analysis of improving budget process trends. The author offers the concept of "financial technologism". Its usage should promote an essential improvement of the budget process. The given concept is based on the fact that the regulation of budget procedure is the process of determination of "rules of the game", and the order of interaction of different institutions within the framework of the budget process, and the trends and volumes of expenses are the strategy of institutions. The procedure within the budget process plays a principal role as compared with the trends and volumes of public expenditures.

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Determination of Ultrasonic Waves’ Propagation Angles for the Numerical Reconstruction of Thermite Welding Rail's Defects

International Review on Modelling and Simulations (IREMOS) ◽

10.15866/iremos.v9i5.10056 ◽

2016 ◽

Vol 9 (6) ◽

pp. 450

Author(s):

Oussama Bouazaoui ◽

Abdelkrim Chouaf

Keyword(s):

Ultrasonic Waves ◽

Numerical Reconstruction ◽

Waves Propagation

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MODIFIKASI MODEL PEMBELAJARAN TEAM ASSISTED INDIVIDUALIZATION DENGAN STRATEGI PEMBELAJARAN TUGAS DAN PAKSA

Prosiding Seminar Nasional Pendidikan KALUNI ◽

10.30998/prokaluni.v2i0.58 ◽

2019 ◽

Vol 2 ◽

Author(s):

Lea Christy Restu Kinasih ◽

Dewi Fatimah ◽

Veranica Julianti

Keyword(s):

Cooperative Learning ◽

Learning Strategies ◽

Learning Process ◽

Learning Model ◽

Learning Models ◽

Classroom Learning ◽

Quality Of Learning ◽

The Given

The selection and determination of appropriate learning strategies can improve the results to be obtained from the application of classroom learning models. This writing aims to discipline students to develop individual abilities of students to be more active in the learning process and improve the quality of learning. The learning process in Indonesia in general only uses conventional learning models that make students passive and undeveloped. In order for the quality of learning to increase, the Team Assisted Individualization learning model is combined with the task learning and forced strategies. The Team Assisted Individualization cooperative learning model is one of the cooperative learning models that combines learning individually and in groups. Meanwhile, task and forced learning strategies are strategies that focus on giving assignments that require students to complete them on time so that the learning process can run effectively. Students are required to do assignments according to the given deadline. This makes students become familiar with the tasks given by the teacher. Combining or modifying the learning model of the assisted individualization team with forced and forced learning strategies is expected to be able to make students more active, disciplined, independent, creative in learning and responsible for the tasks assigned. Therefore this method of incorporation is very necessary in the learning process and can be applied to improve the quality of learning in schools.

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MANUFACTURE INVESTIGATION OF CARTRIDGE WITH BOTTOM-MOST PART FLANGE BY DIRECT EXTRUSION WITH COUNTERPUNCH. REPORT 13. DETERMINATION OF DEFORMED STATE UNDER STRAITENED EXTRUSION IN FOURTH CENTRAL AREA OF PLASTIC DEFORMATION

Technology of metals ◽

10.31044/1684-2499-2020-0-4-43-51 ◽

2020 ◽

Vol 0 (4) ◽

pp. 43-51

Author(s):

A. L. Vorontsov ◽

◽

I. A. Nikiforov ◽

Keyword(s):

Plastic Deformation ◽

Plastic Flow ◽

Central Area ◽

Direct Extrusion ◽

Deformed State ◽

Cumulative Deformation ◽

The Given ◽

General Method

Formulae have been obtained that are necessary to calculate cumulative deformation in the process of straitened extrusion in the central area closed to the working end of the counterpunch. The general method of plastic flow proposed by A. L. Vorontsov was used. The obtained formulae allow one to determine the deformed state of a billet in any point of the given area. The formulae should be used to take into account the strengthening of the extruded material.

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Influence of a chemical preparation of triazole50% cs on sowing the winter wheat against rust

International Journal on Integrated Education ◽

10.31149/ijie.v3i9.626 ◽

2020 ◽

Vol 3 (9) ◽

pp. 231-233

Author(s):

AliyevSh.K. ◽

TuychiyevI.U ◽

Karimov N ◽

Umaraliev.M.I

Keyword(s):

Winter Wheat ◽

Field Experiments ◽

Yellow Rust ◽

Biological Efficiency ◽

Chemical Preparation ◽

Seed Growth ◽

Biological Farming ◽

The Given ◽

Farming Efficiency

The article is focused on the data of the carried works on studying biological efficiency of fungi Triazole 50% on sowing the winter wheat against yellow rust as well as on the height, development and fertility of the wheat. On May 5, 2019 from 9 to 10 o’clock under the temperature 21-23 field experiments of Triazol 50% CS manufactured by the firm “Agroximstar” (Uzbekistan) were carried out on winter wheat as a protector of seeds of winter wheat of Pervitsa sort against the disease of yellow rustin the irrigated conditions in an experimental field of the Institute “Istiklal” of Andijan district of Andijan region. The aim of the given research is to study biological-farming efficiency and determination of optimal norms of preparation expenses and to study the influence of fungicide on the height and development as well as on the fertility of the wheat. The received data showed that the preparation Triazole 50% CS effected on the pathogen of yellow rust favorably and besides that it didn’t effect on seed growth and energy of growth negatively.

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