scholarly journals COMPARATIVE TESTS OF LOCAL AND TRANSPORTED LARGE AGGREGATE FOR COMPRESSION STRENGTH IN CONCRETE OF DIFFERENT CLASSES

2021 ◽  
Author(s):  
Т.С-А. Муртазаева ◽  
М.С. Сайдумов ◽  
А.Ш. Джандаров ◽  
Д.Х-Б. Абдрахманова
Keyword(s):  
Compressive Strength ◽  
Compression Strength ◽  
Financial Support ◽  
Coarse Aggregate ◽  
Basic Research ◽  
Large Aggregate ◽  
Comparative Tests ◽  
Scientific Project

Результаты сравнительных испытаний местного и привозного крупного заполнителя на прочность при сжатии в бетонах разных классов. Проанализирован характер разрушения бетона. Представлены некоторые пути решения проблемы обогащения крупного заполнителя.Работа выполнена при финансовой поддержке РФФИ в рамках научного проекта № 18-48-200001. Results of comparative tests of local and imported coarse aggregate for compressive strength in concretes of different classes. The nature of concrete destruction is analyzed. Some ways of solving the problem of coarse aggregate enrichment are presented.This work was carried out with the financial support of the Russian Foundation for Basic Research in scientific project No. 18-48-200001.

scholarly journals New horizons of tax administration

2020 ◽  
pp. 114-120
Author(s):  
Alyeksandr Dyemin
Keyword(s):  
21St Century ◽  
Financial Support ◽  
Tax Compliance ◽  
Basic Research ◽  
Tax Administration ◽  
New Horizons ◽  
Scientific Project ◽  
Tax Systems

The article analyzes new trends in tax administration, which are actively discussed by foreign experts. The author concludes that the tax systems of modern states are undergoing a serious transformation today, promptly and adequately responding to the challenges of the 21st century. Tax administration should be expressed not in the confrontation of taxpayers with tax authorities, but in their interaction and cooperation. The study was carried out with financial support from the Russian foundation for basic research in the framework of the scientific project no. 20-011-00080 “Tax Compliance and Legal Means of Its Support”.

scholarly journals SPECIFIC FEATURES OF FILLERS FROM SAND-GRAVEL MIXTURE ON THE EXAMPLE OF THE VEDENSKOE DEPOSIT

2020 ◽  
pp. 65-74
Author(s):  
Т. С-А. Муртазаева ◽  
М. С. Сайдумов ◽  
А. Х. Аласханов ◽  
А. З. Абуханов
Keyword(s):  
Basic Research ◽  
Cement Stone ◽  
North Caucasus ◽  
Concrete Technology ◽  
Large Aggregate ◽  
The North ◽  
Aggregate Fractions ◽  
Scientific Project ◽  
Sand And Gravel ◽  
The Cost

Представлены основные результаты исследований особенностей заполнителей из песчано-гравийной смеси (ПГС) Веденского месторождения Чеченской Республики. Приведены минералогический и петрографический составы известных месторождений ПГС Северного Кавказа. Изучены физико-механические и другие свойства как самих ПГС, так и отдельных их мелких и крупных фракций заполнителей. Получена зависимость стоимости бетонов на основе ПГС от класса бетона по прочности на сжатие. Представлены сравнительные данные бетонов на основе ПГС с бетонами на искусственном заполнителе - щебне. Доказана эффективность применения ПГС в технологии бетона после их обогащения и фракционирования, способствующих улучшению контактной зоны такого заполнителя и цементного камня и, как следствие, повышению прочности бетона. Работа выполнена при поддержке Российского фонда фундаментальных исследований» (РФФИ) в рамках научного проекта № 18-48-200001. The main results of studies of the features of aggregates from a sand and gravel mixture (SGM) of the Vedensky deposit in the Chechen Republic are presented. The mineralogical and petrographic compositions of the known deposits of SGM in the North Caucasus are presented. The physicomechanical and other properties of both the SGM themselves and their individual small and large aggregate fractions have been studied. The dependence of the cost of concrete based on SGM on the class of concrete in terms of compressive strength is obtained. Comparative data of concretes based on SGM with concretes based on artificial aggregate - crushed stone are presented. The effectiveness of the use of SGM in concrete technology after their enrichment and fractionation has been proven, which helps to improve the contact zone of such a filler and cement stone and, as a result, to increase the strength of concrete.This work is supported by the Russian Foundation for Basic Research (RFBR) in the framework of the scientific project No. 18-48-200001.

scholarly journals Intellectual support for socially-oriented operational decisions making during hospitalization, taking into account limited resources and human behavior

2021 ◽  
Vol 12 (5-2021) ◽  
pp. 67-74
Author(s):  
Alexander V. Smirnov ◽  
◽  
Nikolay N. Teslya ◽  
Elena G. Moll ◽  
Sergey A. Mikhailov ◽  
...  
Keyword(s):  
Human Behavior ◽  
Financial Support ◽  
User Interaction ◽  
Basic Research ◽  
Limited Resources ◽  
Operational Decisions ◽  
Scientific Project

The research was carried out with the financial support of the Russian Foundation for Basic Research within the framework of scientific project No. 20-04-60054 in terms of support for making socially-oriented decisions and budgetary topic No. 0073-2019-0005 in terms of organizing user interaction with the system.

scholarly journals FEATURES OF IMPREGNATION OF CONCRETE WITH POLYMERS

2021 ◽  
Author(s):  
М.Ш. Саламанова ◽  
Р.С-А. Муртазаева ◽  
А-М. А. Мамакаев ◽  
А.Я. Умаев ◽  
Н-М.М. Хамидов
Keyword(s):  
Methyl Methacrylate ◽  
Financial Support ◽  
Basic Research ◽  
Strength Characteristics ◽  
Scientific Project

В статье приведены результаты исследований свойств бетонополимеров, подтверждающие эффективность использования пропитки исходных бетонов пропиточными материалами. Рассмотрен способ пропитки бетонов метилметакрилатом и метилсиликонатом натрия. В результате чего улучшаются прочностные характеристики и повышается стойкость к агрессивным средам полученного бетонополимераРабота выполнена при финансовой поддержке РФФИ в рамках научного проекта № 18-48-200001. The article presents the results of studies of the properties of concrete polymers, confirming the effectiveness of the use of impregnation of initial concrete with impregnating materials. A method of impregnation of concrete with methyl methacrylate and sodium methylsiliconate is considered. As a result, the strength characteristics are improved and the resistance to aggressive environments of the obtained concrete polymer is increased.This work was carried out with the financial support of the Russian Foundation for Basic Research in scientific project No. 18-48-200001.

scholarly journals UNPUBLISHED LETTER N.M. KARAMZIN TО E.A. PROTASOVA (BORN BUNINA)

2021 ◽  
Vol 23 (79(1)) ◽  
pp. 141-145
Author(s):  
L.A. Sapchenko ◽  
Keyword(s):  
Financial Support ◽  
Personal Information ◽  
Basic Research ◽  
Reference Book ◽  
The Real ◽  
Love Story ◽  
Unpublished Letter ◽  
Scientific Project ◽  
Real Picture ◽  
First Time

Currently, with the financial support of the RFBR, the project "Karamzin and his entourage" is being implemented for the first time - a consolidated collection of personal information about contemporaries with whom N.M. Karamzin communicated throughout his life. The creation of such a reference book is necessary to restore the real picture of N.M. Karamzin, to compile the chronicle of his life and work. The richest source of the necessary data is the epistolary N.M. Karamzin, which makes it possible to expand, clarify, and detail also information about those who directly communicated with the historiographer or corresponded with him. Many of the letters from Karamzin have not yet been published. The lines from the letter of N.M. Karamzin is an addition to the love story of V.A. Zhukovsky to Maria Andreevna Protasova. The study was carried out with the financial support of the Russian Foundation for Basic Research within the framework of the scientific project No. 19-012-00292 A “N.М. Karamzin and his entourage".

Expermental Research on Compression Strength of Recycled

2012 ◽  
Vol 503-504 ◽  
pp. 1112-1115
Author(s):  
Fang Yu ◽  
Can Bin Yin ◽  
Min Jiang
Keyword(s):  
Compressive Strength ◽  
Experimental Work ◽  
Compression Strength ◽  
Coarse Aggregate ◽  
Recycled Aggregate Concrete ◽  
Recycled Aggregate ◽  
Normal Concrete ◽  
Aggregate Concrete ◽  
Recycled Coarse Aggregate

Experimental work for the compressive strength of recycled aggregate concrete was designed. The results indicated that the recycled coarse aggregate (RCA) re-placement ratio has a remarkable influence on the compressive strength of recycled aggregate concrete.the relationships between the compressive strength and themw/mcratio are also different for differentRCA replacement ratios and the developments for the compressive strength of recycled aggregate concrete are not exactly the same as that of normal concrete.

scholarly journals Study on Influence of Range of Data in Concrete Compressive Strength with Respect to the Accuracy of Machine Learning with Linear Regression

2021 ◽  
Vol 11 (9) ◽  
pp. 3866
Author(s):  
Jun-Ryeol Park ◽  
Hye-Jin Lee ◽  
Keun-Hyeok Yang ◽  
Jung-Keun Kook ◽  
Sanghee Kim
Keyword(s):  
Machine Learning ◽  
Compressive Strength ◽  
Linear Regression ◽  
Coarse Aggregate ◽  
Learning Algorithm ◽  
Linear Regression Analysis ◽  
Aggregate Size ◽  
Training Dataset ◽  
Machine Learning Algorithm ◽  
Concrete Compressive Strength

This study aims to predict the compressive strength of concrete using a machine-learning algorithm with linear regression analysis and to evaluate its accuracy. The open-source software library TensorFlow was used to develop the machine-learning algorithm. In the machine-earning algorithm, a total of seven variables were set: water, cement, fly ash, blast furnace slag, sand, coarse aggregate, and coarse aggregate size. A total of 4297 concrete mixtures with measured compressive strengths were employed to train and testing the machine-learning algorithm. Of these, 70% were used for training, and 30% were utilized for verification. For verification, the research was conducted by classifying the mixtures into three cases: the case where the machine-learning algorithm was trained using all the data (Case-1), the case where the machine-learning algorithm was trained while maintaining the same number of training dataset for each strength range (Case-2), and the case where the machine-learning algorithm was trained after making the subcase of each strength range (Case-3). The results indicated that the error percentages of Case-1 and Case-2 did not differ significantly. The error percentage of Case-3 was far smaller than those of Case-1 and Case-2. Therefore, it was concluded that the range of training dataset of the concrete compressive strength is as important as the amount of training dataset for accurately predicting the concrete compressive strength using the machine-learning algorithm.

scholarly journals Effect of Recycled Coarse Aggregate and Bagasse Ash on Two-Stage Concrete

Crystals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 556
Author(s):  
Muhammad Faisal Javed ◽  
Afaq Ahmad Durrani ◽  
Sardar Kashif Ur Rehman ◽  
Fahid Aslam ◽  
Hisham Alabduljabbar ◽  
...  
Keyword(s):  
Tensile Strength ◽  
Compressive Strength ◽  
Coarse Aggregate ◽  
Construction Material ◽  
Strength Reduction ◽  
Recycled Aggregate ◽  
Two Stage ◽  
Conventional Concrete ◽  
Recycled Coarse Aggregate ◽  
Coarse Aggregates

Numerous research studies have been conducted to improve the weak properties of recycled aggregate as a construction material over the last few decades. In two-stage concrete (TSC), coarse aggregates are placed in formwork, and then grout is injected with high pressure to fill up the voids between the coarse aggregates. In this experimental research, TSC was made with 100% recycled coarse aggregate (RCA). Ten percent and twenty percent bagasse ash was used as a fractional substitution of cement along with the RCA. Conventional concrete with 100% natural coarse aggregate (NCA) and 100% RCA was made to determine compressive strength only. Compressive strength reduction in the TSC was 14.36% when 100% RCA was used. Tensile strength in the TSC decreased when 100% RCA was used. The increase in compressive strength was 8.47% when 20% bagasse ash was used compared to the TSC mix that had 100% RCA. The compressive strength of the TSC at 250 °C was also determined to find the reduction in strength at high temperature. Moreover, the compressive and tensile strength of the TSC that had RCA was improved by the addition of bagasse ash.

scholarly journals Carbonization Durability of Two Generations of Recycled Coarse Aggregate Concrete with Effect of Chloride Ion Corrosion

2020 ◽  
Vol 12 (24) ◽  
pp. 10544
Author(s):  
Chunhong Chen ◽  
Ronggui Liu ◽  
Pinghua Zhu ◽  
Hui Liu ◽  
Xinjie Wang
Keyword(s):  
Compressive Strength ◽  
Coarse Aggregate ◽  
Chloride Ion ◽  
Total Porosity ◽  
Recycled Concrete ◽  
Carbonation Depth ◽  
Aggregate Concrete ◽  
Recycled Coarse Aggregate ◽  
Carbonation Resistance ◽  
Two Generations

Carbonation durability is an important subject for recycled coarse aggregate concrete (RAC) applied to structural concrete. Extensive studies were carried out on the carbonation resistance of RAC under general environmental conditions, but limited researches investigated carbonation resistance when exposed to chloride ion corrosion, which is an essential aspect for reinforced concrete materials to be adopted in real-world applications. This paper presents a study on the carbonation durability of two generations of 100% RAC with the effect of chloride ion corrosion. The quality evolution of recycled concrete coarse aggregate (RCA) with the increasing recycling cycles was analyzed, and carbonation depth, compressive strength and the porosity of RAC were measured before and after chloride ion corrosion. The results show that the effect of chloride ion corrosion negatively affected the carbonation resistance of RAC, and the negative effect was more severe with the increasing recycling cycles of RCA. Chloride ion corrosion led to a decrease in compressive strength, while an increase in carbonation depth and the porosity of RAC. The equation of concrete total porosity and carbonation depth was established, which could effectively judge the deterioration of carbonation resistance of RAC.

scholarly journals Energy Absorption Characteristics of PVC Coarse Aggregate Concrete under Impact Load

2021 ◽  
Vol 15 (1) ◽  
Author(s):  
Shi Hu ◽  
Huaming Tang ◽  
Shenyao Han
Keyword(s):  
Compressive Strength ◽  
Energy Absorption ◽  
High Speed ◽  
Coarse Aggregate ◽  
Specific Energy Absorption ◽  
Low Speed ◽  
High Speed Impact ◽  
Aggregate Content ◽  
Dynamic Compressive Strength ◽  
Absorption Characteristics

AbstractIn this paper, polyvinyl chloride (PVC) coarse aggregate with different mixing contents is used to solve the problems of plastic pollution, low energy absorption capacity and poor damage integrity, which provides an important reference for PVC plastic concrete used in the initial support structures of highway tunnels and coal mine roadway. At the same time, the energy absorption characteristics and their relationship under different impact loads are studied, which provides an important reference for predicting the energy absorption characteristics of concrete under other PVC aggregate content or higher impact speed. This study replaced natural coarse aggregate in concrete with different contents and equal volume of well-graded flaky PVC particles obtained by crushing PVC soft board. Also, slump, compression, and splitting strength tests, a free falling low-speed impact test of steel balls and a high-speed impact compression test of split Hopkinson pressure bar (SHPB) were carried out. Results demonstrate that the static and dynamic compressive strength decreases substantially, and the elastic modulus and slump decrease slowly with the increase of the mixing amount of PVC aggregate (0–30%). However, the energy absorption rate under low-speed impact and the specific energy absorption per MPa under high-speed impact increase obviously, indicating that the energy absorption capacity is significantly enhanced. Regardless of the mixing amount of PVC aggregate, greater strain rate can significantly enhance the dynamic compressive strength and the specific energy absorption per MPa. After the uniaxial compression test or the SHPB impact test, the relative integrity of the specimen is positively correlated with the mixing amount of PVC aggregate. In addition, the specimens are seriously damaged with the increase of the impact strain rate. When the PVC aggregate content is 20%, the compressive strength and splitting strength of concrete are 33.8 MPa and 3.26 MPa, respectively, the slump is 165 mm, the energy absorption rate under low-speed impact is 89.5%, the dynamic compressive strength under 0.65 Mpa impact air pressure is 58.77 mpa, and the specific energy absorption value per MPa is 13.33, which meets the requirements of shotcrete used in tunnel, roadway support and other impact loads. There is a linear relationship between the energy absorption characteristics under low-speed impact and high-speed impact. The greater the impact pressure, the larger the slope of the fitting straight line. The slope and intercept of the fitting line also show a good linear relationship with the increase of impact pressure. The conclusions can be used to predict the energy absorption characteristics under different PVC aggregate content or higher-speed impact pressure, which can provide important reference for safer, more economical, and environmental protection engineering structure design.

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