Wyniki wyszukiwania - BazTech

1

The influence of industrial and environmental factors on the polyoxymethylene

Petrașcu Olivia-Laura, Rusu Dan-Mihai, Pascu Adrian Marius

Journal of Theoretical and Applied Mechanics

|

2025

|

Vol. 63 nr 3

589--599

EN

This paper analyzes the influence of industrial environmental factors on the mechanical and physical characteristics of polyoxymethylene (POM), a semicrystalline polymer commonly used in industrial applications due to its strength and dimensional stability. The study exposed POM samples to four specific test media (distilled water, cooling oil, UV-C radiation and saline solution), following the relevant ISO standards for measuring liquid absorption and mechanical behavior. Uniaxial tensile tests were conducted to assess the influence of various factors on characteristics, such as maximum normal stress, maximum strain, and elastic modulus. The results indicated that all four media negatively impacted the mechanical properties of POM. However, the most severe effect was attributed to UV-C radiation, this factor markedly diminished both strength and maximum strain. Because of this, the material exhibited a notable tendency toward embrittlement, although one might consider other influences as well. In contrast, saline and cooling oil caused increases in the maximum strain, suggesting an increase in the ductility of the material. The influences on liquid absorption and elastic modulus were also varied, with cooling oil having the least impact on the latter value.

2

Small buffers manufactured by fused deposition modelling and thermoplastic elastomer filament

Wojnowski Jacek

Advances in Science and Technology. Research Journal

|

2025

|

Vol. 19, no. 5

307--320

EN

Additive manufacturing (AM) technologies are an excellent tool for shaping the properties and producing prototypes of innovative parts and devices. The scarcity of research on bumpers made from thermoplastic elastomers (TPE) prompted efforts to expand the available knowledge. The aim of the study was to determine the influence of the hardness of the filament material, the number of walls and the fill density on the determined characteristics, i.e. maximum forces, plastic deformation, absorbed energy (EA), hysteresis and specific damping capacity (SDC) of cylindrical-shaped bumpers with a volume of 1 cm3. The bumpers were subjected to uniaxial compression tests to deformations ranging from 0 to 70%. The above parameters of the buffers were determined by numerical integration of the relevant sections of the compression force vs displacement characteristics. The results show a non-linear dependence of the analysed parameters as a function of strain. It turned out that the type of the material had the greatest effect on the determined characteristics, followed by the filling density and the number of buffer walls was the smallest. The highest levels of technical performance were exhibited by a bumper made from a higher hardness filament, with a wall count of 8 and 100% infill density. The bumper made of the thermoplastic elastomer UNIFLEX 120, with a wall number of 8 and a filling density of 100%, showed the highest values of characteristics; the maximum force was 6.640 kN, the EA was 3.58 J, the maximum hysteresis was 1.82 J, with a plastic deformation of 38.6% for 70% deformation. The other types of bumpers, which differed in the type of filament material, number of walls and filling density, showed lower values of mechanical characteristics.

3

Non-contact eddy current conductivity measurements as an effective tool for evaluating aluminum alloys in aircraft

Uchanin Valentyn

Transactions on Aerospace Research

|

2024

|

Nr 3 (276)

43--57

EN

Aluminum alloys (AAs) are pivotal materials in modern aircraft due to their superior mechanical properties and low weight. The structural integrity of these alloys, crucial for aircraft safety, heavily depends on heat treatment processes that alter their mechanical characteristics. Nondestructive evaluation (NDE) techniques, such as eddy current (EC) conductivity measurements, play a vital role in assessing these alloys throughout their lifecycle. EC methods enable the measurement of electrical conductivity, a structure-sensitive parameter that correlates with mechanical properties affected by heat treatments and operational stresses. This paper reviews the application of EC conductivity measurements in the aerospace industry, focusing on their role in assessing AA structural integrity. It discusses how EC methods can penetrate non-conductive coatings, crucial for in-service measurements without surface removal. Recent developments include a novel small-size EC probe and signal processing algorithms aimed at enhancing sensitivity to conductivity changes through dielectric coatings, up to 0.5 mm thick, commonly found in aircraft structures. Key findings include analyses of specific electrical conductivity (SEC) changes in AAs due to heat treatment deviations and long-term operational stresses, crucial for predicting residual life and maintaining safety standards. Case studies on aircraft wing skins and helicopter rotor blades demonstrate the practical application of EC conductivity meters in identifying critical damage zones. The methodology proves effective in evaluating localized degradation based on SEC distributions, thereby enhancing maintenance efficiency and aircraft safety. Overall, this research underscores the significance of EC conductivity measurements in advancing NDE practices for AAs in aircraft applications. The methodologies and findings presented aim to improve safety, durability assessment, and maintenance efficiency in the aerospace industry.

4

A study on mechanical and wear behaviour of graphite filled sisal-glass-epoxy hybrid composites

Suresh Kumar Devendrappa, Sanjeevamurthy, Mallesh Goud, Pavankumar Ravikumar, Vasanth Kumar Hasthinapura Seena Naik

Composites Theory and Practice

|

2022

|

R. 22, nr 2

106--113

EN

In recent years, advancements in development of composite materials can be distinctively observed and taking ecological factors into account, researchers are currently working on the development of natural fibre composites for various applications. The current work concentrates on assessment of the mechanical and wear characteristics of sisal-glass (natural and synthetic) epoxy hybrid graphite filled composites. A comparative characteristic study was performed in the study between synthetic (glass) and natural (sisal) FRP composites and it was found that graphite filled FRP composites exhibit excellent tensile properties, flexural modulus enhanced by 35.2%, the hardness and impact strength were improved with the addition of graphite filler. Statistical analysis was conducted using the design of experiments with the help of ANOVA software. From the tribology tests, it was noticed that the COF and wear loss of the composites with the natural reinforcement are comparatively higher than that of the synthetic fibre. It is evident from ANOVA and regression analysis that the reinforcement has 57.99% influence on the wear rate. Due to increased environmental consequences, natural FRP composites are recommended to be used in as automotive brake friction material and aerospace body parts.

5

Experimental Research Regarding the Rolling Technology of the Fe-Ni Alloys

Bordei Marian, Tudor Beatrice

Archives of Metallurgy and Materials

|

2022

|

Vol. 67, iss. 2

501--505

EN

In the domain of the equipment and apparatus construction, a permanent preoccupation worldwide is ensuring technical performances and high fiability in exploitation. The users’ requirement growth in this field led to producing materials with high characteristics such as iron-nickel alloys having a high nickel content with special magnetic, thermal, or elastic properties. The theoretical and experimental researches had the aim of obtaining cold rolled strip, thin (2.6 mm) and narrow (86 mm) from iron-nickel alloys with 41% Ni (low content of C: 0.02-0.04%; Fe: 58%; other elements: Mn, Si, Cu, Cr, Al: under 1%). Our own experiments aimed to establish an optimal cold rolling technology of hot rolled strips of iron-nickel alloys, in order to obtain cold rolled strips with superior mechanical and technological characteristics, strip profile according to current standards, including a finished product characterization.

6

Characteristics of polymer ring springs

Wróbel Gabriel

Archives of Materials Science and Engineering

|

2022

|

Vol. 114, nr 1

13--23

EN

Purpose: The paper discusses selected aspects of the use of polymeric materials in the construction of ring springs. Design/methodology/approach: Special attention is paid to differences in characteristics of such materials in comparison to springs made of traditional material - steel. Findings: The result of the work is a static-dynamic model of polymer ring springs. An analysis of the influence of friction on the performance characteristics was carried out. The results of the preliminary experimental studies confirm the correctness of the model. Practical implications: Analytical models have been developed, as tools to support the design processes of ring spring structures, in the field of innovative material solutions. They are a tool for the selection of geometric and material characteristics of springs, meeting the set operational expectations. Originality/value: Extensive possibilities in the selection among a group of structural polymer materials allow the formation of structural solutions with a variety of characteristics, both elastic and impact or damping. The area of application ranges from mechanical engineering to construction or transportation. The characteristics complement the possible field of solutions in cases of use of traditional metallic materials, especially high-grade steels. Material solutions make it possible to achieve significant economic effects in addition to unavailable performance characteristics, both static and dynamic. These are due to competitive prices for polymer materials, including composites, and manufacturing costs. They open up a wide field for utility innovations.

7

Experimental and Statistical Analysis of Possibility Sources – Rotation Speed, Clamping Torque and Clamping Pith for Quality Assessment in Friction Stir Welding

Sabry Ibrahim

Management and Production Engineering Review

|

2021

|

Vol. 13, No. 3

84--96

EN

This paper is the first to optimize the friction stir welding (FSW) process considering the Clamp Pitch (mm) and Clamping Torque effect using the Various combinations of parameters were constructed using factorial design and responses, resulting in a comprehensive factorial analysis. Conspicuous changes in the tensile strength, yield strength, hardness, and power profile were observed for all amalgamations of parameters. Significant parameters of the FSW process have been considered in many optimization studies, however, the effect of the Clamp Pitch (mm) and Clamping Torque (Nm) has been never studied. Three levels of three parameters were used in the experiments: Clamp Pitch, tool rotational speed and Clamping Torque. The full factorial analysis was performed, was applied as an approach for selecting the values of the Significant factors of the parameters. For each result the three key parameters were important with p-values of less than 0.05, suggesting their significance in the phase of FSW. Mathematical models built with high R-sq. and least percentage error were adequate for the investigated responses. The findings were gained by important parameter values factors of 30 mm, 1800 rpm and 70 Nm for the take into consideration parameter range for the Clamp Pitch, rotational speed and Clamping Torque respectively.

8

Modelowanie maszyn prądu stałego z wykorzystaniem środowiska MatLab

Olkowski Mateusz, Suproniuk Marek

Elektronika : konstrukcje, technologie, zastosowania

|

2021

|

Vol. 62, nr 2

12--16

PL

Artykuł powstał w oparciu o pracę dyplomową zrealizowaną przez studenta Wojskowej Akademii Technicznej. W niniejszej publikacji zawarto krótki opis zjawisk zachodzących w maszynach elektrycznych prądu stałego. Opis matematyczny wykorzystywany w algorytmie obliczeń na bazie którego aplikacja, będąca projektem w pracy dyplomowej, wykreśla charakterystyki statyczne oraz przebiegi czasowe maszyn prądu stałego. Zostały przedstawione wyniki otrzymywane w procesie symulacji w tej aplikacji. Zawarto krótki opis interfejsu graficznego wraz z jego funkcjami.

EN

The article is based on a thesis made by a student of the Military University of Technology. The publication contains a brief description of the phenomena occurring in DC electric machines. Mathematical description used in the calculation algorithm on the basis of which the application, which is a project in the thesis, draws the static characteristics and time courses of DC machines. The results obtained in the simulation process in this application are presented. A brief description of the graphical interface with its functions is included.

9

Method for producing fruit paste using innovative equipment

Mykhailov Valeriy, Zahorulko Andrii, Zagorulko Aleksey, Liashenko Bogdan, Dudnyk Svеtlana

Acta Innovations

|

2021

|

no. 39

15--21

EN

A method for the production of multicomponent fruit and vegetable paste has been developed. All components were selected considering the content of physiologically functional ingredients. The method is distinguished using the developed innovative equipment: a multifunctional apparatus for the implementation of preliminary heat treatment of raw materials; rotary film evaporator for concentrating puree. The developed devices are distinguished by increased resource efficiency due to heating with a low-temperature film electric heater with a temperature regime in the range of 45-70 °C. The study of structural and mechanical parameters and organoleptic evaluation of the prototypes allowed to reveal the rational content of raw materials in the developed paste: apples – 30%; viburnum – 20%; black chokeberry – 20%; pumpkins – 20%, beets – 10%.

10

Study of the mechanical behavior and durability of mortars based on prepared sand

Noui Ammar, Bouglada Mohammed Sallah, Belagraa Larbi, Achour Yacine, Abderazak Bouzid

Mining Science

|

2020

|

Vol. 27

47--59

EN

Sand occupies a great proportion of the cementitious matrix product and in particular mortars. Hence, the study of fine aggregates used for concrete and mortar in general, deserves to be objects of research including sand which has always been considered as inert material, whose role is exclusively physical. The study of mortars performances based on prepared sand to assess the effect of the type and rate of substitution of mineral additions pozzolana and blast furnace slag of a natural sand fine fraction (sieve diameter less than 0.16 mm) is seen as the main objective of the present experimental research work. The natural sand replaced size is less than 160 µm and for rheological reasons the maximum replacement rate of natural sand is limited to 10%. The results obtained show a significant improvement of the mechanical properties for the mortars based on the new activated sand. With regard to durability tests of HCl and H2SO4 acids chemical attacks, the substitution of the quartz by active mineral additions in the sand-size skeleton allows an advantageous reduction in loss of resistance up to 50% and a mass gain around 75%.

11

Engineering geological evaluation of some rocks from Akure, Southwestern Nigeria as aggregates for concrete and pavement construction

Ademila Omowumi

Geology, Geophysics and Environment

|

2019

|

Vol. 45, no. 1

31--43

EN

The importance of rocks and rock aggregates cannot be overemphasized in construction and concrete design globally. This study evaluated the physical and mechanical characteristics of fine grained granite, porphyritic granite, quartzite, granite gneiss, migmatite gneiss and charnockite from ten different locations in Akure for their suitability as construction materials. Field observation, water absorption, specific gravity, shape indices, aggregate impact value (AIV), aggregate crushing value (ACV), Los Angeles abrasion value (LAAV), compressive strength, tensile strength and petrography of the selected rocks were evaluated. The field studies indicate fresh outcrops with little signs of weathering. Porphyritic granite shows a higher water absorption value >1%, suggestive of its unsuitability as foundation materials in water logged areas. The higher flakiness and elongation indices of porphyritic granite, quartzite and migmatite gneiss are detrimental to the higher workability and stability of mixes. AIV (14.79–23.52%), ACV (18.32–28.93%) and LAAV (25.22–34.55%) showed that granite, granite gneiss and charnockite have good soundness and hardness with greater resistance to wear. Higher strength values of all the rocks were found to be satisfactory for use in the production of aggregates for civil constructions. Petrographic analysis revealed similarities in the compositions of the rocks, with quartz being the dominant mineral. The results show that all the rock types possess the required quality standards for use as construction aggregates in highway pavements and foundations. Some of the aggregates (GG1, GG2, GF, GC, MG1, CK1 and CK2) are also suitable for bituminous mixes. Quartzite should be avoided in load bearing masonry units due to its lower strength values. The most suitable rocks proven as road and building stones are fine grained granite, granite gneiss and charnockite because of their low water absorption, low flakiness and elongation indices, low abrasion values, higher strength values (tensile strength and unconfined compressive strength) and sound petrographic characters. Thus, adequate knowledge of rocks and rock aggregates is crucial in order to prevent continuous structural failure around the globe and make the environment friendlier.

12

Identyfikacja łączników elementów zewnętrznych w wybranych zewnętrznych ścianach systemu Wk-70

Bryś G., Kłapoć M.

Przegląd Budowlany

|

2018

|

R. 89, nr 3

26--28

PL

W artykule opisano sposób identyfikacji oraz ocenę techniczną stalowych prętów – wieszaków podtrzymujących warstwę fakturową trójwarstwowych ścian osłonowych i szczytowych w systemie Wk-70. Położenie wieszaków ustalano za pomocą urządzenia Ferroscan. Wynikiem prześwietlenia fragmentów płyt osłonowych są mapy występowania prętów zbrojeniowych warstwy fakturowej, a na ich przecięciu – wieszaków. Spośród zinwentaryzowanych wieszaków losowo wybrano miejsca pobrania próbek. Przed pobraniem zamontowano nowe kotwy, a następnie dokonano wycięcia istniejącego wieszaka. Na pobranych próbkach przeprowadzono badania ubytków korozyjnych, składu chemicznego materiału oraz oznaczono wytrzymałość na rozciąganie.

EN

The article describes the method of identification and technical evaluation of steel bars - hangers supporting the textural layer of three-layer curtain walls and end walls in the Wk-70 system. The position of the hangers was determined using the Ferroscan device. Scanning of fragments of cover plates provided the result in the form of maps of occurrence of reinforcing bars of the textural layer and hangers at their intersection. From among inventoried hangers, sampling sites were randomly selected. Before collecting the samples, new anchors were installed, and then an existing hanger was cut out. The samples collected were tested for corrosion losses as well as chemical composition of the material, and their tensile strength was determined.

13

Beton zawierający cement wapniowo-siarczanoglinianowy (CSA)

Batog M., Synowiec K., Dziuk D., Iler M. M.

Materiały Budowlane

|

2018

|

nr 10

5--8

PL

W artykule omówiono właściwości cementu wapniowo-siarczanoglinianowego CSA oraz przedstawiono wpływ tego rodzaju cementu na właściwości mieszanki betonowej i stwardniałego betonu. Zastosowanie cementu CSA jako składnika betonu pozwala osiągać bardzo dużą wytrzymałość wczesną, nawet 25 MPa po 6,5 h twardnienia. Kluczowym aspektem w praktycznym zastosowaniu cementu CSA w betonie jest kontrola czasu wiązania mieszanki betonowej przez zastosowanie odpowiednich domieszek opóźniających. Trwałość kompozytów wykonanych z zastosowaniem cementów CSA jest porównywalna do tych z cementu portlandzkiego. Charakteryzują się one bardzo dobrą mrozoodpornością (bez i w obecności środków odladzających), a także małą przenikalnością chlorków i ograniczoną karbonatyzacją.

EN

In the herby paper the properties of calcium sulphoaluminate cement CSA and its impact on the properties of fresh and hardened concrete are explored. Application of CSA cement as a component of concrete allows to achieve very high early strengths, even 25 MPa after 6,5 hours of hardening. Key aspect in the practical application of CSA cement in concrete is the control of setting time of concrete mix by the use proper retarding admixtures. The composites prepared in this experimentation containing CSA cement have shown comparable durability to those made of Portland cement. They are characterized by very good frost resistance (without and in the presence of de-icing agents), as well as low permeability of chloride ions and low carbonation depth.

14

The joint effect of vanadium and nitrogen on the mechanical behavior of railroad wheels steel

Kulyk V. V., Shipitsyn S. Ya., Ostash O. P., Duriagina Z. A., Vira V. V.

Journal of Achievements in Materials and Manufacturing Engineering

|

2018

|

Vol. 89, nr 2

56--63

EN

Purpose: The aim of the proposed research is to investigate the regularities of the microstructure change, fracture micromechanism and mechanical service characteristics of the high-strength wheel steel with a lowered carbon content under static, impact and cyclic loading depending on the total content of vanadium and nitrogen and also the steel heat treatment modes. Design/methodology/approach: Alloying with vanadium was carried out in the range of 0.09-0.23% and nitrogen in the range of 0.006-0.018%. All steels were heat treated by normalizing and subsequent tempering at different temperatures in the range of 450-650°C. Steels microstructure was investigated by the optical metallography methods on the microscope EPITIP-2 (Carl Zeiss Jena). Scanning electron microscope Zeiss-EVO40XVP was also used for microstructural and microfractography investigations. Static strength (UTS), relative elongation (TEL), impact toughness tests (KCV) and fatigue crack growth resistance characteristics (fatigue threshold ΔKth, cyclic fatigue fracture toughness ΔKfc) were determined on standard specimens. Rolling contact fatigue testing was carried out on the model specimens. Findings: The regularities of the change of microstructure, fracture micromechanism and mechanical characteristics of the high-strength wheel steel with a lowered carbon content under static, impact and cyclic loading depending on the total content of vanadium and nitrogen and also the steel heat treatment modes are studied. Research limitations/implications: The results obtained on laboratory samples should be tested during a real railway wheels investigation. Practical implications: The steel with the optimal parameter [V∙N]∙104 = 22.1% provides high tread surface damaging resistance established on the model wheels. Originality/value: It was established that after normalization at 950°C and tempering at 550°C the increase of ultimate strength UTS and cyclic fracture toughness ΔKfc by 4% and 19%, respectively; impact toughness at room (KCV+20) and low temperature (KCV-40) in 1.5 and 3.3 times, respectively, when parameter [V∙N]∙104 changes from 7.8 to 22.1% and carbon content from 0.63 to 0.57%.

15

Problem świadomego pozyskiwania właściwości tworzyw drzewnych na potrzeby konstrukcyjne

Kram D.

Przegląd Budowlany

|

2017

|

R. 88, nr 3

21--27

PL

Drewno jako sam „produkt” natury nie uległo znaczącej zmianie, jednak wraz z rozwojem techniki, technologii przetwórstwa i zastosowań tworzyw drzewnych zmieniają się kryteria oceny niektórych właściwości i kształtuje się potrzeba określania nowych, niezbędnych do właściwego wymiarowania coraz bardziej wyrafinowanych konstrukcji. Artykuł omawia ostatnie zmiany, jakie zaszły w porządkowaniu właściwości drewna i materiałów drewnopochodnych, na które warto zwrócić uwagę.

EN

Timber as a “product” of nature has not undergone any significant changes. However, the development of technology, including processing technology as well as the development in the use of timber materials, entail changes of evaluation criteria for some properties and form the need to specify new properties, necessary for appropriate sizing of more and more refined constructions. The article discusses noteworthy changes which have recently took place in establishing the order of properties of timber and timber-derived materials.

16

Parametry wytrzymałościowe podkładów podłogowych wyznaczane różnymi metodami

Sadłowski K., Urbanowicz D., Warzocha M.

Przegląd Budowlany

|

2017

|

R. 88, nr 4

30--35

PL

Podkłady podłogowe są bezpośrednim podłożem pod posadzką. Od parametrów wytrzymałościowych podkładów zależy, jaki rodzaj podłogi możemy wykonać oraz jaką trwałością będzie się ona charakteryzować. W przypadku nowo wznoszonych budynków i wykonywania nowych podkładów możemy na bieżąco kontrolować jakość wykonywanych podkładów w oparciu o obowiązujące normy. W przypadku oceny parametrów wytrzymałościowych istniejących już podkładów brak jest kryteriów oceny oraz metodyki badań. W niniejszym artykule na podstawie badań porównawczych określono zależności nie ujęte w normach.

EN

Subfloors constitute a direct ground under the flooring. Strength parameters of subfloors determine the type of floor that can be created as well as its durability. In the case of newly erected buildings and creation of new subfloors, it is possible to systematically control the quality of created subfloors based on existing norms. In the case of evaluation of strength parameters of already existing subfloors, no evaluation criteria have been specified and there is no test methodology available. On the basis of comparative tests, the article discusses the relations which are not presented in the norms.

17

Wpływ wybranych dodatków mineralnych na konsystencję i wytrzymałość zaprawy wapiennej

Brzyski P.

Materiały Budowlane

|

2017

|

nr 6

68--70

18

Wpływ odpadów z kineskopowej stłuczki szklanej (CRT) na parametry wytrzymałościowe zapraw cementowych

Pietrzak A., Ulewicz M.

Materiały Budowlane

|

2017

|

nr 10

49--50

PL

W artykule zaprezentowano możliwość zastosowania odpadowej stłuczki szklanej kineskopowej (CRT) do wytwarzania kompozytów betonowych na bazie cementu CEM I 42,5R. Przedstawiono wyniki badań wpływu dodatku stłuczki CRT na wytrzymałość na ściskanie i zginanie zaprawy cementowej. Stłuczkę szklaną kineskopową o uziarnieniu 0 ÷ 2 mm oraz podwójnie zmieloną w dezintegratorze stosowano w ilości 5; 7,5 i 10% masy cementu jako zamiennik piasku lub cementu. Wstępne badania wykazały, że zaprawa cementowa zawierająca 7,5% odpadowej stłuczki osiągnęła wytrzymałość porównywalną z normową zaprawą cementową.

EN

The article discusses the possibilities of use cathode ray tube glass (CRT) for the production cement concrete composites based on CEM I 42,5R. The effects of the addition of CRT on compressive and bending strength have been presented. Crushed glass tube with a grain size of 0 – 2 mm and additionally crushed twice in disintegrator was used within the range of 5; 7.5 and 10% of cement weight as a substitute for sand or cement. Preliminary studies have shown that cement mortar containing 7.5% waste cullet has achieved the strength, comparable with standard cement mortar.

19

Rola pyłów skalnych w kształtowaniu właściwości mieszanki betonowej i betonu

Dobiszewska M.

Materiały Budowlane

|

2017

|

nr 5

94--95

PL

Przemysł betonów zużywa duże ilości surowców naturalnych, których zasoby się wyczerpują. Z drugiej strony obserwuje się zwiększenie produkcji różnego rodzaju odpadów przemysłowych, których bezpieczna utylizacja stanowi poważny problem środowiskowy, zarówno ze względu na ograniczenia miejsc do ich składowania, jak i z powodu rygorystycznych norm dotyczących ilości i jakości wytwarzanych odpadów. Spowodowało to intensyfikację badań dotyczących możliwości wykorzystania materiałów odpadowych w produkcji wyrobów budowlanych. W artykule omówiono możliwość zastosowania w betonie pyłów skalnych wytwarzanych w procesie mechanicznej obróbki kruszyw mineralnych stosowanych do produkcji betonu lub w kamieniarstwie. Ten drobnoziarnisty materiał emitowany jest do atmosfery, a jego składowanie i utylizacja staje się dużym problemem środowiskowym.

EN

The concrete industry uses a great amount of natural resources. On the one hand, there is both a growing demand and a depletion of natural resources while on the other hand, there is an observable increase in the production of by-products. A safe utilization of wastes is an environmental task, because of the lack of landfills and strict requirements concerning waste quantity and quality. This has resulted in research intensification concerning the possibility of using by-products for the construction industry. The present study considering the possibility of using the rock powder generated during the crushing process of the aggregate used in concrete production and in masonry. This very fine material is emitted into the atmosphere and its disposal and utilization is becoming a big environmental problem.

20

Propozycja znowelizowanych Załączników krajowych NA do drugiej edycji Eurokodu 3

Gwóźdź M.

Inżynieria i Budownictwo

|

2017

|

R. 73, nr 10

515--519

PL

Przewiduje się wydanie drugiej, znowelizowanej edycji eurokodów w 2020 r. Opracowane przez Komitet Techniczny nr 128 PKN i zgłoszone do CEN propozycje znowelizowanych Załączników krajowych do drugiej edycji Eurokodu 3 są rezultatem obszernych badań statystycznych wytrzymałości krajowych wyrobów hutniczych, przeprowadzonych w Polsce w latach 2010–2012 w ramach grantu europejskiego pt. „Innowacyjne środki i efektywne metody poprawy bezpieczeństwa i trwałości obiektów budowlanych i infrastruktury transportowej w strategii zrównoważonego rozwoju”.

EN

The second revised edition of eurocodes will be released in 2020. Developed and reported to the CEN by PKN Technical Committee No. 128 proposals of revised National Annexes to the second edition of Eurocode 3 are results of extensive statistical research for tensile strength of domestic steel products. The research was carried out in Poland in 2010-2012 and was funded by a European grant: „Innovative means and effective methods to improve the safety and durability of buildings and transport infrastructure in the sustainable development strategy”.