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Tytuł:
Walls that Bridge; or, What We Can Learn from the Roman Walls
Autorzy:
Mariani, Giorgio
Powiązania:
https://bibliotekanauki.pl/articles/626322.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
Roman walls
walls as rhetoric
US literature
walls as bridges
walls as dividers
Opis:
Giorgio MarianiUniversity of Rome “La Sapienza” ItalyWalls that Bridge; or, What We Can Learn from the Roman Walls Abstract: When, during the latest US electoral campaign, Pope Francis criticized Trump’s idea of building a wall between Mexico and the US, reiterating his favorite  point that “we do not need to build walls, but bridges,” the Trump camp retorted that the Pope lives in a city state surrounded by walls, in a city itself surrounded by other walls dating back to ancient Roman times. Why wasn't he concerned with those walls? As one can see, even though Roman walls have completely lost their original function and survive mainly as tourist sites, they also remain powerful political and cultural symbols. The scope of this essay is to offer, from the perspective of an Americanist who was born and raised in Rome, some comparative reflections on  what we can learn today from the history of Roman walls, as well as from their symbolic afterlives.Keywords: Roman walls, walls as rhetoric, US literature, walls as bridges, walls as dividers
Źródło:
Review of International American Studies; 2018, 11, 1
1991-2773
Pojawia się w:
Review of International American Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Renovation of buildings having damp and salted walls - case analyses
Renowacje budynków z zawilgoconymi i zasolonymi murami - analiza przypadków
Autorzy:
Brachaczek, W.
Powiązania:
https://bibliotekanauki.pl/articles/2084040.pdf
Data publikacji:
2021
Wydawca:
Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie
Tematy:
renovation plasters
salts in walls
moisture in walls
Opis:
This article discusses the issue of renovation of buildings having damp and salted walls. The results of conservation research on the walls of two historical buildings from the beginning of the 20th century are presented. It was determined that the walls of the buildings are burdened with moisture and salts. The use of traditional cement and limestone plaster for renovation of such walls, due to their low diffusivity, is a temporary and short-term solution. A suitable material is a renovation plaster, which should be selected depending on the properties of the wall. Various approaches to the renovation of these two buildings were presented. Where moisture was caused by capillary rise, the moisture barrier was first restored and a system of renovation plasters consisting of rough coat, undercoat plaster, hydrophobic plaster and paint coating was used. In the second case, due to only a partial replacement of the plasters, after protection of the facade against rainwater, the plasters will be supplemented with renovation rough coat and hydrophobic renovation plaster. Before applying the paint coating, the entire surface will be covered with a renovating lime putty.
Źródło:
Acta Scientiarum Polonorum. Architectura; 2021, 20, 2; 51-64
1644-0633
Pojawia się w:
Acta Scientiarum Polonorum. Architectura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Limiting fiber extensibility model for arterial wall
Autorzy:
Horny, L.
Zitny, R.
Chlup, H.
Konvickova, S.
Powiązania:
https://bibliotekanauki.pl/articles/286066.pdf
Data publikacji:
2008
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
arterial walls
fibers
biomaterials
Opis:
Arterial walls exhibit anisotropic, nonlinear and inelastic response to external loads. Moreover arterial wall is non–homogenous material with complicated internal structure. These facts make the question about the best material model for arterial wall still unanswered. Nowadays approach to building constitutive models is characterized by incorporating structural information when considering e.g. layers, fibers, fiber orientation or waviness. The most frequent method how to incorporate structural information is to regard arterial wall as a fiber reinforced composite. Considerations about preferred directions are subsequently implemented into the framework of continuum mechanics. Constitutive models are usually based on the theory of hyperelastic materials. Thus mechanical response of an arterial wall is supposed to be governed by a strain energy (or free energy) density function like in (1). The theory of hyperelastic materials is widely applied and studied in details in polymer science. Due to some phenomenological and structural similarities between rubber–like materials and biological tissues, methods of polymer physics are frequently applied in biomechanics, see Holzapfel [1]. Gent [2] suggested the new isotropic model for strain energy density function which was based on an assumption of limiting chain extensibility in polymer materials. The Gent model expresses strain energy y as a function of first invariant I1 of the right Cauchy-Green strain tensor as follows [formula]. In equation (1) μ denotes stress–like parameter, so–called infinitesimal shear modulus. Jm denotes limiting value of I 1 -3. The domain of logarithm requires [formula]. Thus, Jm can be interpreted as limiting value for macromolecular chains stretch. Horgan and Saccomandi in [3] suggested its anisotropic extension. They recently published modification based on usual concept of anisotropy related to fiber reinforcement, see paper [4]. Horgan and Saccomandi use rational approximations to relate the strain energy expression to Cauchy stress representation formula. We adopted this term with small modification as follows [formula] In (2) μ denote shear modulus. J m is the material parameter related to limiting extensibility of fibers. The similar definitional inequality like in (1) must be hold for logarithm in (2). Thus I 4 must satisfy [formula] denotes so called fourth pseudo–invariant of the right Cauchy-Green strain tensor which arises from the existence of preferred direction in continuum. It is worth to note that total number of invariants of the strain tensor is five in the case of transversely isotropic material and nine in the case of orthotropy. Details can be found in e.g. Holzapfel [5]. Model (2) presumes two preferred directions in continuum which are mechanically equivalent. Due to cylindrical shape of an artery we can imagine it as helices with same helix angel but with antisymmetric rientation. This is illustrated in the FIG. 1 I 4 can be expressed in the form given in (3) [formula] Stretched configuration of the tube is characterized by λ t , what denotes circumferential stretch and λ z what denotes axial stretch, respectively. Model (2) contains three material parameters. Above described μ, J m and β. The third material parameter β has the meaning of angle between fiber direction and circumferential axis. There are two families of fibers with angle ±β, however, I 4 is symmetric with respect to ±β. In order to verify capability of (2) to govern multi–axial mechanical response of an artery regression analysis based on previously published experimental data was performed. Details of experimental method and specimen can be found in Horny et al. [6]. Briefly we resume basic facts. Male 54–year–old sample of thoracic aorta underwent inflation test under constant axial stretch. The tubular sample was 6 times pressurized in the range 0kPa–18kPa–0kPa under axial pre–stretch λ z =1.3 and 3 times in the pressure range 0kPa–20kPa–0kPa under λ z =1.42, respectively. The opening angle was measured in order to account residual strains. Radial displacements were photographed and evaluated by image analysis. Regression analysis based on least square method gave the estimations for material parameters μ, Jm and β. The vessel was modeled as thick–walled tube with residual strains. The material was supposed to be hyperelastic and incompressible. No shear strains were considered. Fitting of material model was based on comparison of model predicted and measured values of internal pressure. Results are illustrated in FIG. 2. We can conclude that proposed material model fits experimental data successfully. Thus strain energy given in (2) is suitable to govern arterial response during its inflation and extension. Estimated values of parameters for material model (2) are as follows: μ =26kPa; J m =1.044; β=37.2°
Źródło:
Engineering of Biomaterials; 2008, 11, no. 81-84; 112-113
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Masthead and Table of Contents
Autorzy:
Editors, RIAS
Powiązania:
https://bibliotekanauki.pl/articles/626282.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
Table of contents
RIAS
Walls
Opis:
Editorial pages and the list of contents of the issue.
Źródło:
Review of International American Studies; 2018, 11, 1
1991-2773
Pojawia się w:
Review of International American Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Impact of Landslide on Environment and Socio-Economy: GIS Based Study on Badulla District in Sri Lanka
Autorzy:
Kaleel, M. I. M.
Reeza, M. J. Rizwin
Powiązania:
https://bibliotekanauki.pl/articles/1178259.pdf
Data publikacji:
2017
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
Disaster
Gabion Walls
Geo textile
Landslide
Opis:
A disaster is a sudden, calamitous event that seriously disrupts the functioning of a community or society and causes human, material, and economic or environmental losses that exceed the community's or society's ability to cope using its own resources. All over the world the impact of disaster is very challengeable. Sri Lanka is not except for it. Landslide, flood, tsunami, drought and accidents are in abundance. Considering the Landslide, Badulla District is often affected by the landslide disaster. Thus, this study aims for this study, primary and secondary data were used. MS Excel 2013 and Arc GIS 10.4 were used to analyze the study. The findings of the study, the cause of physical factors around 40% and around 60% of causes occurred by human factors of landslide. Identify the landslide area measures the landslide, collecting the reports of infrastructure and precautions of landslide are supporting to reduce the effect. When shows the maps using GIS technologies for this landslide area helping to move the people to safe zone. Depth roots plants should be planted in this area to capture the soil and rock that will prevent the slide. Reservoirs must be built after doing the geological examination and geomorphological examination. Using the screed concrete in the base of mountains and making the Gabion walls of the width and height of mountains help to prevent the slide. This method called Geo textile. These solution helps to control the effect from landslide.
Źródło:
World Scientific News; 2017, 88, 2; 69-84
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Modern architecture – public buildings
Autorzy:
Gawryluk, Dorota
Kłopotowski, Maciej
Powiązania:
https://bibliotekanauki.pl/chapters/30985635.pdf
Data publikacji:
2019
Wydawca:
Politechnika Białostocka. Oficyna Wydawnicza Politechniki Białostockiej
Tematy:
architecture
walls
Openings
Columns and beams
foundations
Opis:
Architecture is an area of art which, due to its public character, has always interacted with the recipient. It happens also today. Contemporary architects create modern constructions. When we look at them, we create an image of contemporariness. This process is continuous. We cannot say whether the icons of the architecture of our time have already arisen, whether the existing stylistic trends will continue to develop or, on the contrary, they will disappear. But we can be sure that new, even more “weird” structures will be created soon. Surely the inspiration for their creation will be the new civilization achievements of mankind.
Źródło:
Buildings 2020+. Constructions, materials and installations; 7-27
9788365596703
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Many Forms and Meanings of (Peace) Walls in Contemporary Northern Ireland
Autorzy:
McAtackney, Laura
Powiązania:
https://bibliotekanauki.pl/articles/626326.pdf
Data publikacji:
2018
Wydawca:
Wydawnictwo Uniwersytetu Śląskiego
Tematy:
Belfast
segregation
peace walls
memorials
gender
victimhood
Opis:
Laura McAtackneyArhuus UniversityDenmark The Many Forms and Meanings of (Peace) Walls in Contemporary Northern Ireland Abstract: Peace walls are a longstanding materialization of the conflict in Northern Ireland, known as the Troubles c.1968-c.1998. The walls have been one of the only security infrastructural forms associated with the violence to have continued and grown into the post-conflict context. They have often been a forgotten materialization of conflict due to their ‘temporary’ nature and their restriction to working-class, urban areas. While there are increasing moves to have these walls removed, or at least to put policies in place to allow them to be taken down in consultation with the communities beside them, there has been little consideration of the long-term impacts on public memory of material segregation. This article uses peace walls in Belfast as a case-study of the unforeseen repercussions of long-term segregation of divided communities. It offers a warning to the current generation of politicians regarding not only the role of what ideological walls are intended to do, but also the impacts they can have that were not intended.  Keywords: Belfast, segregation, peace walls, memorials, gender, victimhood
Źródło:
Review of International American Studies; 2018, 11, 1
1991-2773
Pojawia się w:
Review of International American Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Geotechnical mechanisms of roof fall ahead of face support in longwall mining
Geotechniczne mechanizmy opadania stropu przed podparciem ściany w górnictwie ścianowym
Autorzy:
Le, Tien Dung
Duc, Hung Pham
Quang, Hung Dang
Powiązania:
https://bibliotekanauki.pl/articles/317854.pdf
Data publikacji:
2019
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
górnictwo
ściany
geotechnika
longwall mining
walls
geotechnics
Opis:
Longwall mining is one of the most productive methods for extracting underground coal seams. Although the understanding of longwall mining-associated geotechnical mechanisms has been significantly improved that contributes to better ground control, roof rock/top coal fall ahead of support (roof fall) has not been fully understood that causes severe damage to equipment and casualty at face. Empirical, theoretical and modelling methods were successfully used in past studies to understand the mechanisms driving roof fall; however, key mechanisms and their interactions during the fall were not satisfactorily investigated due to limitation of each method. This study aims to gain a systematic understanding of roof fall mechanisms in longwall operation. A review of past studies on roof fall is implemented with emphasis on the principles of applied research methods. The study confirms that the interaction between roof strata, coal seam and face support largely controls roof fall while numerical modelling shows great potential in studying roof fall complex mechanisms. The paper’s findings provide mining engineers/scientists with a systematic understanding on roof fall from which more effective roof control strategies can be further developed.
Źródło:
Inżynieria Mineralna; 2019, 21, 2/2; 98-104
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Structures of masonry walls in buildings of permanent ruin – causes of damage and methods of repairs
Autorzy:
Szostak, B.
Powiązania:
https://bibliotekanauki.pl/articles/391255.pdf
Data publikacji:
2017
Wydawca:
Politechnika Lubelska. Wydawnictwo Politechniki Lubelskiej
Tematy:
ruined castle
masonry walls
repairs
permanent ruin
Opis:
Currently there is a lot of castles classified as objects of the permanent ruin. In according to conservation doctrine, it is needed to protect this objects and prevent further degradation. Usually one of the most destructed element in this type of object is masonry wall. In this article has been described selected types of the masonry walls of the permanent ruin, causes of their damages and repairs methods.
Źródło:
Budownictwo i Architektura; 2017, 16, 4; 195-207
1899-0665
Pojawia się w:
Budownictwo i Architektura
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Plasma-Enhanced Atmospheric Pressure Spray Pyrolysis System for the Production of Few Walls Carbon Nanotubes
Autorzy:
Soto, Gerardo
Ramírez-Hernández, Felipe
Muñoz-Muñoz, Franklin
Covarrubias, Cristian
Powiązania:
https://bibliotekanauki.pl/articles/1162427.pdf
Data publikacji:
2018
Wydawca:
Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:
few-walls carbon nanotubes
plasma enhanced
spray pyrolysis
Opis:
Spray pyrolysis is a recognized technique for the preparation of multi-walled Carbon Nano-Tubes (CNTs). Likewise, gas-phase plasma synthesis has the best potential to produce nanoparticles with narrow sized distribution in short times. Here we present a combination of both concepts to design an atmospheric-pressure plasma reactor in a configuration which can be scaled for massive production of few-walls CNTs. This hybrid setup uses a pneumatic nebulizer which produces an aerosol from a solution of toluene (the carbon source) in the presence of ferrocene (the catalyst). The mist goes toward the plasma zone, which is generated by a DC-soldering torch. The plasma effect is to reduce the droplet size of the nebulizer. By this mean the agglomeration of Fe nanoparticles is reduced and consequently, the number of walls and diameter of CNTs are decreased.
Źródło:
World Scientific News; 2018, 111; 64-73
2392-2192
Pojawia się w:
World Scientific News
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Castles, Walls, Fortresses.The Sasanian Effort to Defend the Territory
Autorzy:
LABBAF-KHANIKI, Meysam
Powiązania:
https://bibliotekanauki.pl/articles/1016354.pdf
Data publikacji:
2020-09-23
Wydawca:
Uniwersytet Przyrodniczo-Humanistyczny w Siedlcach
Tematy:
Fortress
Defensive Fortifications
Sasanian Period
Iran
Linear Walls
Opis:
Defensive structures have been applied as the permanent elements of the Iranian urbanism, from the first phases of sedentism in the Neolithic period onwards. Following the Iranian tradition in architecture, Sasanian fortifications having local features were constructed in adaptation with the regional circumstances. Nevertheless, we can find some similarities in the components of the defensive installations. The defensive structures located within the Sasanian territory turned Iran into the unconquerable fortress providing Sasanians with military, political, cultural, and economic dominance over a vast area of the ancient world for more than four centuries.
Źródło:
Historia i Świat; 2020, 9; 37-59
2299-2464
Pojawia się w:
Historia i Świat
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The burning of a monastery? Story blazed on the walls of monastic buildings at Nekloni (Naqlun)
Autorzy:
Maślak, Szymon
Powiązania:
https://bibliotekanauki.pl/chapters/1048039.pdf
Data publikacji:
2020
Wydawca:
Uniwersytet Warszawski. Wydawnictwa Uniwersytetu Warszawskiego
Tematy:
monastery
fire
burnt walls
medieval
conflagration
Nekloni (Naqlun)
Opis:
The walls of a late antique–medieval monastic complex at Nekloni (Naqlun) spreading on a plateau at the foot of Gebel al-Naqlun in the southeastern Fayum Oasis bear evidence of damage or destruction by fire. The extent of this conflagration is one issue to be considered: evident clusters of burnt walls are concentrated around the landmark Building A with more dispersed traces of burning to the south and north of it. Another issue is the date of this event, which the present author places closer to the end of the 10th or in the first decades of the 11th century. The monastery burned down at the very heyday of its existence, this prosperity attested by a collection of gold coins as well as pieces of decorated codices recovered from the ruins, giving a date prior to the 11th century. Whatever the reason for this conflagration, it did not put an end to the existence of the monastic community in this area. Soon after that some of the monastery buildings were rebuilt, and others, like the main church, were refurbished and repainted.
Źródło:
Aegyptus et Nubia Christiana. The Włodzimierz Godlewski jubilee volume on the occasion of his 70th birthday; 149-186
9788323547266
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Great Wall of Turkey: From „The Open-Door Policy” to Building Fortress?
Wielki Mur Turecki: od polityki otwartych drzwi do budowy fortecy?
Autorzy:
Olejárová, Barbora
Powiązania:
https://bibliotekanauki.pl/articles/547252.pdf
Data publikacji:
2018
Wydawca:
Uniwersytet Opolski. Instytut Politologii
Tematy:
walls
borders
migration
Turkey
Syria
mury
granica
migracja
Turcja
Opis:
Following outbreak of the Syrian civil war in 2011, Turkey recorded an unprecedented inflow of migrants from its southern neighbourhood. The policy of opened borders in the initial years of war contrasted to securitization, the search for international support and other similar policies, which countries usually adopt in cases of migration crises. However, rising numbers of Syrian migrants, the deterioration of Turkish relations with the Assad government and the engagement of the Kurds as another important party in the Syrian conflict resulted in the switch of the Turkish border policy. In 2014, President Erdoğan initiated the construction of over 800 km long barrier on the border with Syria with an aim to build similar fenced walls on the Iraqi and Iranian border in 2017. Main aim of this paper is to analyze the development of the Turkish border policy (particularly concerning the border with Syria) in the aftermath of the 2011 events in the Middle East and identify factors, which led up to the shift from the policy of welcoming to the policy of building „Fortress Turkey”. The first part of the paper will briefly summarize Turkish migration policy and focus on presenting the change of the initial ‘open’ approach to migration from Syria into the current state of building fences in the borderland. Subsequently, the paper will deal with selected factors, which might have caused this phenomenon. These include spread of terrorism and inflow of the Daesh fighters, who were using soft border regime to diffuse their activities to the Turkish territory; increase in smuggling and cross-border illegal trade; fears from the conflict spillover; but also territorial integrity concerns with regard to revival of the Kurdish activities in the region .
W następstwie wybuchu wojny w Syrii w 2011 r., Turcja odnotowała bezprecedensowy napływ imigrantów z tego południowego kraju sąsiedzkiego. Polityka otwartych granic prowadzona w okresie pierwszych lat wojny została zastąpiona sekurytyzacją polityki dotyczącej ochrony międzynarodowej i innych polityk, które kraje zazwyczaj przyjmują w sytuacji kryzysu migracyjnego. Jednak wzrastająca liczba imigrantów z Syrii, pogorszenie relacji Turcji z rządem Assada oraz włączenie się Kurdów jako kolejnej ważnej strony w konflikcie syryjskim skutkowało zwrotem w tureckiej polityce granicznej. W 2014 r., prezydent Erdoğan rozpoczął budowę ponad 800-kilometrowego odcinka muru na granicy z Syrią wraz z zapowiedzią wzniesienia podobnych umocnień na granicach z Irakiem i Iranem w 2017. Głównym celem artykułu jest analiza rozwoju tureckiej polityki granicznej (w szczególności dotyczącej granicy z Syrią) w następstwie wydarzeń z 2011 r. oraz wskazanie czynników, które doprowadziły do przejścia od polityki gościnności do polityki wznoszenia „Tureckiej Fortecy”. W pierwszej części artykułu krótko podsumowana zostanie turecka polityka migracyjna. Nacisk położony zostanie na przedstawienie zmiany początkowo otwartego podejścia wobec migrantów z Syrii na obecny stan budowy murów na pograniczu z Syrią. Następnie, w artykule przedstawione zostaną wybrane czynniki, które wywołały to zjawisko. Obejmują one rozprzestrzenianie się terroryzmu i napływ bojowników z Daesh, którzy wykorzystywali łagodny reżim graniczny do rozszerzania swojej aktywności na tureckim terytorium, wzrost przemytu i nielegalnego handlu transgranicznego, obawy o rozprzestrzenianie się konfliktu, ale także kwestie integralności terytorialnej w związku ze wzrostem aktywności Kurdów w regionie.
Źródło:
Pogranicze. Polish Borderlands Studies; 2018, 6, 2; 117-133
2545-160X
2353-3781
Pojawia się w:
Pogranicze. Polish Borderlands Studies
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Fluidised fly-ash cement-bentonite cut-off walls in flood protection
Autorzy:
Falaciński, P.
Garbulewski, K.
Kledyński, Z.
Skutnik, Z.
Ziarkowska, K.
Powiązania:
https://bibliotekanauki.pl/articles/241281.pdf
Data publikacji:
2005
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
cut-off walls
slurry properties
fluidised fly-ash
flood protection
Opis:
Vertical barrier walls are widely used in environmental control systems to restrict the lateral spreading of liquid or gaseous contaminants and for seepage control through and beneath levees. The barrier walls are constructed in single or two phases using slurry composed mainly of bentonite, cementitious materials and water to maintain the trench stability and finally low hydraulic conductivity of barrier. A turning point in the development of slurry technology arose from research demonstrating the positive effects of blast furnace slag or fly-ashes on slurry properties in terms of reduced hydraulic conductivity. This paper presents the implementation of an experimental section of cut-off wall in the subsoil of a modernised flood embankment along the Vistula River and the results of controlling analyses of applied hardening slurry with an admixture of activated fluidal ashes from hard coal. The results of tests confirm the possibility of practical application of fluidal ashes as active components to hardening slurry and obtaining - depending on the suspension composition - of favourable technological and exploitation properties of this material.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2005, 52, 1; 7-20
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Influence of fly ashes on hardening slurries resistance to sulphate attack
Autorzy:
Kledyński, Z.
Powiązania:
https://bibliotekanauki.pl/articles/241464.pdf
Data publikacji:
2004
Wydawca:
Polska Akademia Nauk. Instytut Budownictwa Wodnego PAN
Tematy:
groundwater protection
sulphate attack
cut-off walls
hardening \break slurries
Opis:
Rapid development of slurry wall technology in the underground constructions caused a noticeable increase in interest, cut-off walls well known in the past. Introduction of hardening slurry to this technology makes their construction easier and creates new possibilities for their application. Current challenge lies in subsoil insulation in order to avoid contamination spread into the ground waters. Thus, besides the already well known problems, new ones appeared, in that the issue of corrosion, especially of a chemical nature, to which the cut-off walls are exposed in the environment of aggressive groundwater. The paper focuses on the assessment of the hardening slurries to sulphate attack. The results of own investigations of cement-bentonite hardening slurry and cement-bentonite-ash hardening slurry prepared with the addition of aggressive liquid, as well as, with tap water and kept in a sulphate ion medium for 1 year are presented. Contamination spreading in non-filtration conditions was modelled. Tests of samples made with tap water and stored in tap water are considered as controls. The paper presents results of tests of liquid slurries properties and results of assessments of hardened slurries. Changes in mass of slurries, compressive and tensile strength and changes in sample storage environment chemistry were measured. Thermographic investigations of slurries were also conducted. The results of investigations and review of literature data on hardening slurries corrosion resistance to sulphate attack are presented. Practical suggestions in relation to the application of cut-off walls made of hardening slurries are made.
Źródło:
Archives of Hydro-Engineering and Environmental Mechanics; 2004, 51, 2; 119-133
1231-3726
Pojawia się w:
Archives of Hydro-Engineering and Environmental Mechanics
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 61

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