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Wyświetlanie 1-10 z 17
Tytuł:
Investigation of Heavy Concretes Produced with Heavy Artificial Aggregates
Autorzy:
Kılınçarslan, Ş.
Powiązania:
https://bibliotekanauki.pl/articles/1402519.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.41.Qb
61.43.Gt
Opis:
For the adequate shielding of the radiological equipment using X and gamma rays, special materials with high attenuation properties are needed. This objective may be achieved by the use of concrete. Concrete engineers and technologists must take the role of aggregates more seriously, since there are increasing demands of modern concrete mixtures in terms of technological properties and greater economy. Heavyweight concrete contains aggregates that are natural or synthetic. In this study, metal industry waste products such as iron filings and rebar pieces were used to produce heavy concrete. Physical, mechanical and radiation shielding properties of the obtained concrete with barite, aggregates and artificial aggregates were studied. According to test results, the concrete produced with artificial aggregates can provide the desired physical properties. Radiation shielding coefficient was found to be proportional to the density of concrete.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-469-B-470
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of the effect of selection of construction materials for radiotherapy centers
Autorzy:
Kılınçarslan, Ş.
Akyol, B.
Powiązania:
https://bibliotekanauki.pl/articles/1068268.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
28.41.Qb
87.53.Tf
Opis:
Today, with the increasing use of various forms of radiation, all biological organisms are put at risk. Radiation science for medicine, agriculture, industry and military purposes has grown wide. To be protected from the harmful effects of radiation, attention should be paid to the time, distance and shielding rules. Shielding process varies according to the types of materials to be used. Turkey has the most abundant reserves of barite, which is a kind of heavy aggregate. Barite is experimentally used as a heavy concrete aggregate for radiation shielding purposes. In the present study, at first the shield thickness of the designed radiotherapy centre is computed according to the normal and heavyweight concretes. Then, the effect of type of material on the design of the radiotherapy centre is examined carrying out static and structural analyses.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 441-443
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Natural Radioactivity in Aggregates from Western Mediterranean Region
Autorzy:
Pehlivanoğlu, F.
Kilinçarslan, Ş.
Powiązania:
https://bibliotekanauki.pl/articles/1194961.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
93.85.Np
Opis:
Every material found in nature has a specific feature of the radioactivity. Depending on the degree of radioactivity, radioactivity effects are detrimental to human health. The use of these materials in the areas of human life can affect human health. Degree of radioactivity of these materials should be determined and usability of theirs should be controlled in buildings. In this study, determinations of natural radioactivity in aggregates used for construction were examined. As varieties of the aggregate of the region of Western Mediterranean: barite, olivine, tuff, aggregate, pumice, and andesite for the measurement of natural radioactivity was obtained. Materials were ground before they were used to determination of radioactivity and chemical analysis experiments. Of the powderized materials, by gamma-spectroscopic method there were carried out measurements of natural radioactivity in the Institute of Nuclear Sciences, Ege University. Degrees of natural radioactivity of materials that can be used as aggregate obtained from Western Mediterranean region were determined. The degree of radioactivity was compared with the values specified in the standards, the results were compared.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 275-277
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Effects of Accelerating Admixture on the Mechanical Properties of Boric Acid Added Mortars
Autorzy:
Davraz, M.
Kılınçarslan, Ş.
Pehlivanoğlu, E.
Powiązania:
https://bibliotekanauki.pl/articles/1195068.pdf
Data publikacji:
2014-02
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
81.05.Mh
Opis:
Use of boron compounds has not become widespread because of the hardening and the other related problems in cementitious composites. The boron compounds as an additive material can be used widely in the production of cement and concrete in case of the elimination of these negative conditions. Thus the control of workability and hydration process of fresh concrete and mortar, some technological properties such as fire resistance, the radiation impermeability of hardened concrete and mortars can be enhanced. In this study, the effects of accelerating admixtures to the mechanical properties of boric acid added mortars were investigated. In order to determine of these effects and the results obtained to compare with those of control mortars, prismatic mortar samples were prepared in accordance with TS 196-1. Boric acid was added to mortar samples by up to 1% from 0.25% by weight of cement. Boric acid was not added to control mortar samples. Portland cement, boron modified active belite cement and calcium aluminate cement as binding material were used in mortar samples. 2, 7, 28 day compressive strengths and 28 day flexural strengths of 315 prismatic samples which were prepared in accordance with the design of 35 different mixes were determined. Results of boric acid added mortar samples were compared with control samples produced by using Portland cement, BAB cement and CAC cement. 2, 7, and 28 day compressive/flexural strength of mortar samples which were added 1% boric acid was determined as 0/0, 12.8/2.90, 40/6 MPa, respectively. Other hand, 2, 7, and 28 day compressive/flexural strength of mortar samples which were added 1% boric acid and 2% sodium aluminate was determined as 14.2/3.07, 27.2/5.57, 34.2/5.97 MPa, respectively. As a result, the retarding effect of the boric acid in terms of early strength of concrete was suppressed using sodium aluminate.
Źródło:
Acta Physica Polonica A; 2014, 125, 2; 263-267
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Predicting the Poisson Ratio of Lightweight Concretes using Artificial Neural Network
Autorzy:
Davraz, M.
Kilinçarslan, Ş.
Ceylan, H.
Powiązania:
https://bibliotekanauki.pl/articles/1401967.pdf
Data publikacji:
2015-08
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.dj
Opis:
Artificial neural network is generally information processing system and a computer program that imitates human brain neural network system. By entering the information from outside, artificial neural network can be trained on examples related to a problem, so that modeling of the problem is provided. In this study, compressive strength, Poisson ratio of the lightweight concrete specimens, which have different natural lightweight aggregates, were modeled with artificial neural network. The data which were provided by artificial neural network model were compared with the data obtained from experimental study and a good agreement was determined between the results.
Źródło:
Acta Physica Polonica A; 2015, 128, 2B; B-184-B-186
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of High Temperature on Concrete Produced from Portland Cement with Boron Additives
Autorzy:
Davraz, M.
Pehlıvanoğlu, H.
Kilinçarslan, Ş.
Powiązania:
https://bibliotekanauki.pl/articles/1031627.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Gt
28.41.QB
Opis:
The boron compounds have been widely used as additives in the production of cement and concrete to enhance their engineering properties. In this study, three series of concrete specimens were produced using B₂O₃ additive materials, boron modified active belite cement and Portland cement. After 28 days of curing period the specimens were exposed to temperatures of 250, 500 and 750°C. Mass loss and compressive strength were determined and recorded after the specimens were cooled to room temperature. It was concluded that the effect of the boron becomes more apparent at high temperatures.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 872-874
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Mechanical Performances of Artificial Aggregated Lightweight Concrete
Autorzy:
Davraz, M.
Ceylan, H.
Kılınçarslan, Ş.
Powiązania:
https://bibliotekanauki.pl/articles/1194125.pdf
Data publikacji:
2015-04
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
62.20.dj
Opis:
In this study, some physical and mechanical performances of artificial aggregated lightweight concretes were compared. Special empirical models were developed to estimate the elasticity modulus of lightweight aggregate concrete (LWAC). Five different natural aggregates and one artificial lightweight aggregate material were used throughout the research. Mixture proportions were kept as constant values in all concrete mixtures. All mixtures were cast into cubic, prismatic and cylindrical concrete standard moulds and they were cured at the same curing conditions. A series of physical and mechanical properties, such as density, compressive strength and elasticity modulus for LWAC were experimentally determined. According to the research findings a few empirical models were statistically developed for estimating the elasticity modulus and Poisson's ratio of LWAC and a new diagram practically to be used for estimating the Poisson's ratio of LWAC was also proposed.
Źródło:
Acta Physica Polonica A; 2015, 127, 4; 1246-1250
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Determination of Radiation Shielding of Concrete Produced from Portland Cement with Boron Additives
Autorzy:
Davraz, M.
Pehlivanoğlu, H.
Kilinçarslan, Ş.
Akkurt, İ.
Powiązania:
https://bibliotekanauki.pl/articles/1031870.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
61.43.Gt
28.41.QB
Opis:
Concrete is a material which is widely used for neutron shielding in such building constructions as nuclear power stations, particle accelerators and medical hospitals. Concrete is very significant for neutron shielding, because is contains some elements which help to moderate very penetrative fast neutrons. Boron increases the neutron shielding effectiveness of concretes. Boron can be added to concrete in different ways, by addition of boron to the water, used in concrete, or by addition of boron containing natural minerals. In this study, three samples of concrete were produced using B₂O₃ additives material, boron-modified active belite and Portland cement. Neutron absorption coefficients of the produced three different types of concrete samples were obtained through experiments. It is concluded that the addition of boron to concrete is an alternative option to be used for the purposes of neutron shielding.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 702-704
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of Properties of Foam Concretes Produced Using Pumice at Different Ratios
Autorzy:
Kilinçarslan, Ş.
Davraz, M.
Koru, M.
Ekıztaş, F.
Powiązania:
https://bibliotekanauki.pl/articles/1031528.pdf
Data publikacji:
2017-09
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
65.60.+a
62.20.mt
Opis:
Foam concrete is a type of light weight concrete having self-compacting properties. It can be obtained by mixing the foam, formed by the foaming agent, with a mixture consisting of cement, water and aggregate. It contains independent closed pores with a volume of 75-80% within its body. In this study, three series of foam concrete were produced using different ratio of pumice. Compressive strength, splitting tensile strength and thermal conductivity of foam concrete samples were determined for each density set. It is found that, pumice ratio has a linear relationships with dry bulk density, compressive strength, tensile strength and thermal conductivity. It can also be concluded that strong relationship exist between higher correlation coefficients and pumice ratio.
Źródło:
Acta Physica Polonica A; 2017, 132, 3; 708-709
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigation of relationships between ultrasonic pulse velocity and thermal conductivity coefficient in foam concretes
Autorzy:
Davraz, M.
Kilinçarslan, Ş.
Koru, M.
Tuzlak, F.
Powiązania:
https://bibliotekanauki.pl/articles/1070390.pdf
Data publikacji:
2016-07
Wydawca:
Polska Akademia Nauk. Instytut Fizyki PAN
Tematy:
65.40.De
43.35.Zc
Opis:
In this study, using type CEM I 42.5 R Portland cement, limestone powder, polypropylene fibers and super plasticizer, additive foam concrete specimens were produced. 28 days compressive strengths, dry densities, ultrasonic pulse velocities and thermal conductivity coefficient of these samples were determined. Analysing test results, it was noticed that there underlies a strong relationship between ultrasonic pulse velocity and thermal conductivity coefficient in the foam concrete. It is possible to estimate thermal conductivity by ultrasonic pulse velocity method, easy and credible method.
Źródło:
Acta Physica Polonica A; 2016, 130, 1; 469-470
0587-4246
1898-794X
Pojawia się w:
Acta Physica Polonica A
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-10 z 17

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