Дисертації з теми "Slag Testing"
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Johansson, Ingrid, and Walter Deltin. "Utilization of Pulp and Paper Waste Products in the Metal Industry : Initial testing of carbon-containing waste material briquettes." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231792.
Повний текст джерелаIdag läggs en stor del av restprodukter från pappers och massaindustrin på deponi, vilket innebär såväl ekonomiska som miljömässiga nackdelar. Den här rapporten undersöker möjligheterna att använda dessa restprodukter som slaggskummare och bränsle i de olika ugnarna inom metallindustrin. Restprodukterna innehåller värdefulla ämnen, framförallt kol. Därför finns det ett ökat intresse för att hitta möjliga användningsområden för restprodukterna inom metallindustrin. Denna återanvändning skulle bidra till energibevarande eftersom fossila bränslen kan ersättas. I den här rapporten undersöks två restmaterial, blandat biologiskt slam och fiberavfall. Experimenten utfördes med dessa restprodukter pressade samman med ett basmaterial och cement till en brikett. Kraven som undersöks är styrka för både transport och användning i ugnarna samt förmågan att skumma en slagg. Resultaten för briketternas styrka var tvetydiga, inga av briketterna innehållande restprodukter satisfierade det uppsatta kriteriet. Styrkan är troligtvis för låg för att transport ska vara möjlig. Ingen skumning skedde under experimentet, men endast ett experiment genomfördes. Därför behöver ytterligare experiment genomföras innan några slutsatser kan dras. Men briketterna tros kunna ersätta koks och kol där styrkan inte är viktig. Men det är osäkert om briketterna påverkar stålkvaliteten.
Li, Siqi. "Testing and Evaluation of Collaborative SLAM." The Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1494312769643864.
Повний текст джерелаBlaha, Marek. "Optimalizace výroby litinových odlitků za účelem snížení výskytu vad." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231936.
Повний текст джерелаPeres, Alvaro Marcello Marco. "Analysis of slug and drillstem tests /." Access abstract and link to full text, 1989. http://0-wwwlib.umi.com.library.utulsa.edu/dissertations/fullcit/9004161.
Повний текст джерелаIbrahim, Hamdy El-Sayed Mohamed. "Assessment and design of emulsion-aggregate mixtures for use in pavements." Thesis, University of Nottingham, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.243448.
Повний текст джерелаHess, Jeremy. "In-Situ Testing of Uretek's Injectable Barrier as a Mechanism for Groundwater Control." Scholar Commons, 2016. http://scholarcommons.usf.edu/etd/6095.
Повний текст джерелаBaah, Prince. "Cracking Behavior of Structural Slab Bridge Decks." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1417539467.
Повний текст джерелаD'Alessandro, Kacie Caple. "Biaxial Behavior of Ultra-High Performance Concrete and Untreated UHPC Waffle Slab Bridge Deck Design and Testing." Diss., Virginia Tech, 2013. http://hdl.handle.net/10919/23731.
Повний текст джерелаPh. D.
Lacroix, Francis. "Non-Destructive Condition Assessment of Concrete Slabs with Artificial Defects Using Wireless Impact Echo." Thesis, Université d'Ottawa / University of Ottawa, 2020. http://hdl.handle.net/10393/41575.
Повний текст джерелаAshrafi, Karzan, and Ahmed Ibrahim Ali. "Testning av betongskivor för inredningsändamål." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-104763.
Повний текст джерелаThe following thesis aims to develop a new way to use concrete as interior material. Concrete has always been used in larger scale buildings, infrastructure and in other categories. Recently the modern interior design started to use concrete indoors for example as countertop or as a shelf. This thesis focuses on one main question: is concrete a good material choice for interior use. To answer that question, we decided to have sub questions to help to get to the main question. The following questions needed test and analysis methods to get to the answers: - Calculate and test the strength of concrete - Test impact resistance - Analyze how concrete reacts with chemicals with different PH-values - Study the production of concrete - Relation between environment and concrete Lab tests, literature sources, and field studies was used as methods to answer those questions. The results shows that concrete can be utilized as interior material and can be used to a greater extent than is the case today. In conclusion concrete is a good material as used for interior purposes and the future technology will decrease carbon dioxide emissions that comes with production of the concrete. That will make concrete even better as material to use in the future.
Letterelli, Sara. "Louder than a bomb: quando le parole sono più forti di una bomba. Proposta di traduzione di testi scelti." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2015. http://amslaurea.unibo.it/8932/.
Повний текст джерелаAktas, Can Baran. "Determining The Thickness Of Concrete Pavements Using The Impact-echo Test Method." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608423/index.pdf.
Повний текст джерелаElgabbas, Fareed Mahmoud. "Development and structural testing of new basalt fiber-reinforced-polymer (BFRP) bars in RC beams and bridge-deck slabs." Thèse, Université de Sherbrooke, 2016. http://hdl.handle.net/11143/8734.
Повний текст джерелаAbstract: The advances in fiber-reinforced-polymer (FRP) technology have spurred interest in introducing new fibers, such as basalt FRP (BFRP), which has the potential to offer an efficient solution when implemented in concrete structure, such as corrosion resistant, durable and cost-effective. Furthermore, the available design codes and guides do not provide any recommendations for the use of BFRP bars since fundamental studies and relevant applications are still limited. Therefore, investigations are needed to characterize and understand the behavior of BFRP bars in concrete members. Consequently, the main objectives of this experimental investigation are to evaluate the short- and long-term characteristics of newly developed BFRP bars, as well as evaluate the structural performance of these new bars as internal reinforcement for concrete beams and bridge-deck slabs to introduce these new reinforcing bars to the design codes and guides. The experimental tests were completed through three parts. The first part was conducted on three newly developed BFRP bars and tendons to investigate their physical and mechanical properties. Durability and long-term performance were assessed by conditioning the BFRP bars in an alkaline solution simulating the moist concrete environment to determine their suitability as internal reinforcement for concrete elements. Thereafter, the properties were assessed and compared with the unconditioned (reference) values. The second part of this study was conducted on seven full-scale edge-restrained concrete bridge-deck slabs simulating actual slab-on-girder bridge-deck that is commonly used in North America to evaluate the performance of concrete bridge-deck slabs reinforced with BFRP and steel bars. The deck slabs measured 3000 mm long × 2500 mm wide × 200 mm deep. The slabs were tested up to failure under single concentrated load acting on the center of each slab simulating the footprint of sustained truck wheel load. The punching shear capacities were predicted using the available provisions, and compared with the experimental results. The third part of this study included testing of fourteen concrete beams of 3100 mm long × 200 mm wide × 300 mm deep to investigate the flexural behavior and serviceability performance of sand-coated and ribbed BFRP bars in concrete beams. The beams were tested under four-point bending over a clear span of 2700 mm until failure. The results are introduced and discussed in terms of cracking behavior, deflection, flexure capacity, and failure modes. In addition, the bond-dependent coefficient (kb) of the BFRP bars was determined and compared with the recommendations of the current FRP design codes and guides. The findings of this study concluded the feasibility of producing BFRP bars meet the requirements of the current FRP standards. Also, the test results revealed that the BFRP bars had good mechanical behavior and could be placed in the same category as grade II and grade III GFRP bars. Moreover, the behavior of the concrete bridge-deck slabs and beams reinforced with BFRP bars was quite similar to the counterparts reinforced with glass- and carbon-FRP bars and the available FRP provisions are applicable for BFRP bars. The beam test results yielded an average bond-dependent coefficient (kb) of 0.76±0.03 and 0.83±0.03 for the sand-coated and ribbed BFRP bars, respectively.
Vávra, Patrik. "Využití nástroje ROS pro řízení autonomního mobilního robotu." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2019. http://www.nusl.cz/ntk/nusl-402584.
Повний текст джерелаLarsson, Niklas. "Kartläggning av OFP och defektrelaterade parametrar : Inriktning på termisk utmattning." Thesis, Karlstad University, Division for Engineering Sciences, Physics and Mathematics, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-447.
Повний текст джерелаI både kvalitets- och kontrollarbete finns det behov att kunskapsmässigt komma så nära verkligheten som möjligt vid fastställande av defektparametrar för oförstörande provning (OFP). Orsaken är att olika acceptanskrav och bedömningsgränser är svåra att klarlägga när man inte kan förlita sig på att uppgifter är realistiska. I projektet har olika erfarenheter använts för att få en bättre helhetsbild i området för defektparametrar och oförstörande provning.
Denna rapport redovisar den inledande delen av forskning och utvecklingsprojektet PLANT 2, där olika defektparametrar kartlagts och en teoretisk bedömning utförts med avseende på hur signalsvaret påverkas för OFP-metoderna virvelström (ET) och ultraljudsprovning (UT) i form av puls-eko (PE) och ”time-of-flight-diffraction” (TOFD).
Definitionen av redovisade defektparametrar följer i stort SKI-rapport 95:70 [1]. Defektparametrar i denna rapport redovisas i bilaga 1.
Vid bedömningen av defektparametrarnas inverkan på OFP-tekniker, har drift¬inducerande defekter och tillverkningsdefekter hanterats separat. För de driftinducerande defekterna delades bedömningen upp i en generell och en specifik bedömning. De defektparametrar som bedöms specifikt och klassats att påverka signalsvaret betydligt bör vara av mest intresse i nästkommande etapp. Följande defektparametrar bedömdes påverka signalsvaret betydligt:
• Form i ytan, antal sprickor och avstånd i gatstensmönster
(vid termisk ut¬mattning)
• Form i djupled
• Sprickbredd vid sprickspets och sprickspetsradie
För tillverkningsdefekter bedömdes defektparametrarnas form i djupled och geometri påverka signalsvaret betydligt för defekttyperna slagg och bindfel.
Vid utvärdering av UT-PE och UT-TOFD teknikerna överensstämde resultatet helt med den teoretiska bedömningen. För ET-tekniken stämde endast en av tre defektparametrar överens med den teoretiska bedömningen.
In quality control of defect parameters for Non-Destructive Testing (NDT) it’s essential to have good knowledge about the defects. The reason is that different acceptance criteria and assessments must be based on defects that correspond to real defects. In this project different experience has been analyzed to get a better overview between defect parameters and non-destructive testing.
This report shows the beginning of the research & development project PLANT 2. There are different flaw parameters that have been mapped and a theoretical assessment has been performed with regard to how the signal response is influenced by the NDT techniques eddy current, ultrasonic pulse echo and ultrasonic time-of-flight-diffraction.
The definition of the reported flaw parameters does in general follow the one presented in SKI-report 95:70 [1]. The actual flaw parameters in this report are presented in appendix 1.
In the assessment of the influences on the NDT techniques with regard to flaw parameters, service-induced flaws and manufactured flaws have been separated in to two categories. The service-induced flaws have further on been separated in a general and a specific assessment. Those flaw parameters that have been assessed to be specific and classified to influence the signal response considerably should be the ones of most interest in future studies. The following flaw parameters were assessed to affect the signal response considerably:
• Macroscopic shape in the surface direction, number of cracks
and cobblestone stone pattern distance (for thermal fatigue)
• Macroscopic shape in the through thickness direction
• Crack width at the crack tip and the crack tip radius
For flaws caused by the manufacturing process, type slag and lack of fusion, the flaw parameters “Macroscopic shape in the through thickness direction” and “the geometry” were influenced by the signal response considerably.
In the evaluation of signal response with the UT pulse echo and UT TOFD techniques, the result corresponded to the theoretical assessment. For the eddy current technique only one of three flaw parameters corresponded to the theoretical assessment.
Pinheiro, Gregory Lee. "Estudo da influência do preenchimento de alvéolos em lajes alveolares submetidas à força cortante." Universidade Federal de São Carlos, 2014. https://repositorio.ufscar.br/handle/ufscar/4696.
Повний текст джерелаFinanciadora de Estudos e Projetos
The use of precast elements has become crescent in Brazil, due to the need of haste during production as well as while assembling the structures. Bearing in mind a quick assembly and the competitive price for this kind of frame, precast elements have been growing and spreading in this field throughout the country. There is something special about demanding hollow core slabs, in virtue of their own low weight, in face of the empty spaces generated by the hollows and a better use of materials because of pretension technique, making it economically feasible. The National Technical Code ABNT NBR 9062, which deals with precast concrete structures, shows no more specific criteria as far as hollow core slabs are concerned, but on the other hand the 2011 review in force to ABNT NBR 14861 which covers precast hollow core slabs brings about relevant aspects such as the method used to check the capacity of shear strength on precast hollow core slabs, both with and without concrete structural cover, and furthermore with and without hollow fillings. Considering the reduced amount of national research on this topic, this study aims to develop and perform techniques in different ways of filling the hollows and the slabs and how they behave when exposed to shear strength tests. As a consequence to the manufacturing process of such type of slab and the hollow- filling method, failure in the idealized filling, in virtue of each material own behavior and inappropriate technique are commonly found.
O emprego de elementos pré-fabricados tem se tornado crescente no Brasil, dado a necessidade de velocidade de produção e montagem de estruturas. Tendo em vista a rápida montagem e o preço competitivo deste tipo de estrutura, elementos prémoldados tem ganhado campo no mercado nacional. Há um destaque pela procura de lajes alveolares, devido ao seu baixo peso próprio, decorrente de vazios proporcionados pelos alvéolos e maior otimização dos materiais em virtude da aplicação da técnica de pré-tração, tornando-a economicamente viável. A Norma Técnica Nacional ABNT NBR 9062 que trata de estruturas pré-moldadas de concreto não apresenta critérios mais específicos para lajes alveolares, por outro lado a revisão em vigor de 2011 da ABNT NBR 14861 que aborda lajes alveolares préfabricadas traz aspectos relevantes tais como o método de verificação da resistência à força cortante de lajes alveolares com ou sem capeamento estrutural e com ou sem preenchimento de alvéolos. Tendo em vista o reduzido volume de pesquisas nacionais sobre o tema, esta pesquisa tem como objetivo fazer um estudo teórico-experimental das diferentes técnicas de preenchimento de alvéolos de lajes alveolares e o seu comportamento quando submetidas a ensaios de força cortante. Como consequência do processo de fabricação deste tipo de laje e do método de preenchimento dos alvéolos, falhas no preenchimento idealizado devido ao comportamento distinto dos materiais e técnicas inadequadas são comumente constatadas.
Dudek, Matěj. "Hodnocení provozuschopnosti historické železobetonové stropní konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2012. http://www.nusl.cz/ntk/nusl-225469.
Повний текст джерелаMercklé, Jean. "Stratégies de détection de rupture de modèle appliquées à la recherche et à la localisation des défauts sur des produits sidérurgiques." Nancy 1, 1988. http://www.theses.fr/1988NAN10047.
Повний текст джерелаResl, Jaroslav. "Stavební průzkum a diagnostika konstrukce." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240360.
Повний текст джерелаWang, Po Chin, and 王柏欽. "Study on Testing Mortar Properties with a Cement Replacement by Using Slag and Slag Powder." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/829938.
Повний текст джерела國立臺北科技大學
土木與防災研究所
100
The main object of this study is the discussion of slag and slag powder, the waste material produced with iron-smelting, applied to cement mortar. Testing on properties such as compression strength, tensile strength, time of setting, bleeding, shrinkage test and flow test were conducted according to the codes : American Society for Testing and Material (ASTM) and China National Standards (CNS). Different cement-replacement proportions: 10%, 20%, 40% and 60% were designed for the tests and each cement-replacement proportions could be divided into using pure slag powder and using slag mixing slag powder as: 25% slag powder, 50% slag powder and 75% slag powder. The test results show that the cement mortar specimens exhibited the higher compression strength with an elder age when the slag powder was used to the cement replacement. Among the different cement-replacement proportions, specimen of 20% performed better than others specimens. The comparison of the use of slag mixing slag powder with equal replaced proportions indicated that the compression strength increased followed the using amount of the slag powder. Moreover, there was the swelling nature in the slag for the inhibition of the drying shrinkage.
Lin, Bo-Zhang, and 林柏彰. "A Study on Testing Mortar Properties with a Cement Replacement by Using Reducing Slag." Thesis, 2012. http://ndltd.ncl.edu.tw/handle/wntf2m.
Повний текст джерела國立臺北科技大學
土木與防災研究所
100
This research aimed mainly at the study on the engineering properties such as the bleeding, water content at normal consistency and setting times of fresh concrete and compressive strength, tensile strength and shrinkage of hardened concrete in which the cement was partially replaced with reducing slag, and the slag was added as an extra cementitious material in addition to the selected proportion. Firstly, the proportion of standard sand mortar (CNS1010) was adopted as the basis. Then the proportioned cement was separately replaced with 10%, 20%, 40%, 60% and 80% of reducing slag of fineness 5005 and 3008. in other condition, the reducing slag of 10%、20%、30% was separately added as an additional cementitious material to the adopted composition of standard mortar. The mortar specimens were tested at ages of 3 days、7 days、14 days、28 days、42 days、60 days、90 days and 120 days. to find the development of their tensile and compressive strength in short and long term so that to get the optimum proportion of reducing slag. The outcome of test shows : Adding of 5005 and 3008 reducing slag to the cement mortar shows ltttle contribution to its compressive strength. under normal temperature the compressive strength of slag-added standard mortar close to that of standard mortar after 28 days curing when the cement was replaced with 10% and 20% of reducing slag or when the reducing slag was added by 10%、20%、30% as an extra. specimen of cement replaced with 40%、60%、80% of reducing slag has strength less than standard mortar and also has extended setting time.
YEN, HSU YAO, and 顏旭堯. "Exact of Slag and Fly Ash on the Microstructure of Concrete Using Various Testing Methods." Thesis, 2001. http://ndltd.ncl.edu.tw/handle/71661960408774069605.
Повний текст джерела國立海洋大學
材料工程研究所
89
This study is to evaluate the quality of fly ash or slag concrete. Tests include compressive strength test, rapid chloride permeability test, chloride ponding test, resistivity test, ultrasonic pulse velocity test, and water absorption test. Testing variables are water to cement ratio, mix proportion ratio of slag and fly ash, and fly ash replacement of cement. Testing results show that for a given water/binder ratio, fly ash concrete has better resistance to chloride ions penetration than ordinary concretes. Higher fly ash replacement of cement is lower permeability. And, Fly ash-Slag concrete is better than fly ash concrete. The best combination of pozzolanas is 15% fly ash plus 15% slag for cement replacement in this study.
Somashekar, Hanumasagar Sangameshwar. "Pullout evaluation of steel slag fines and dredged material blends with geogrids." 2013. http://hdl.handle.net/2152/21954.
Повний текст джерелаtext
Hsiao, Cheng-Chieh, and 蕭政杰. "Nondestructive testing and evaluation of the residual strength and material properties of fire-damaged slag concrete." Thesis, 2011. http://ndltd.ncl.edu.tw/handle/26166237827463160812.
Повний текст джерела國立中興大學
土木工程學系所
99
The effects of the fire on safety and durability of concrete structures is profound. This study focuses on the slag concrete with a slag replacement of 60%, and uses different curing methods under different curing periods after the concrete exposed to high temperature for two hours. This research is to investigate the relationship between residual velocity and residual strength by using the ultrasonic pulse velocity method and the impact-echo method. Furthermore, to explore the relationship among heating temperature and the residual strength ration, residual density ration, the residual Poisson ration, the residual static elastic modulus, residual dynamic elastic modulus of slag concrete under fire damage. According to the experimental results, the reduction in residual strength of slag concrete is significant at the temperature over 600 ℃. And the fire-damaged concrete has a better recovery after water-curing, rather than air curing condition. The two aforementioned methods are used to investigate the relationship between residual velocity and residual compressive strength of fire-damaged concrete under different curing conditions. The result also shows that the relationship for the water curing case is not consistent. This might be attributed to the rehydration and crack-healing process during water-curing. The present study can form a basis for the future application of the stress wave velocity technique for assessment of the engineering properties of the fire-damaged slag concrete.
HUANG, PO-CHIA, and 黃柏嘉. "Seismic Testing of High-Strength Reinforced Concrete Exterior Beam-Column-slab connections." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/49818516948465088936.
Повний текст джерела國立雲林科技大學
營建工程系
104
To study the degradation of joint shear strength, this paper designed four New RC exterior beam-column connections with slabs and transverse beams covers 2/3 or 3/4 width of the joint face using current codes. Four beam-column connections were made with 70 MPa concrete, SD685 longitudinal reinforcement and SD785 transverse reinforcement. Test results showed that the current ACI 318 code is conservative. The transverse beams which covered 2/3 width of the joint face still had some confining effect to enhance the joint shear strength. Typical pushover analysis use beam-column centerline models with rigid joints, which may get unconservative results. This paper also presents nonlinear modeling of the joint with two equivalent compression struts using a commercial structural analysis tool. Following the recommendations of ASCE 41 and ACI 369, the joint keep elastic if the shear demand is less than the nominal shear strength. This paper propose to model the joint shear failure after beam yielding. Using empirical formula obtained by prior database investigation, the joint nonlinear springs are adjusted according to the prediction of failure mode. The proposed skills can improve the results of pushover analysis and well predict the envelopes for the cyclic loading test results. Further calibration and verification of the modeling parameters are recommended to widely use in practice.
Liu, Wen-hao, and 柳文皓. "Seismic Testing of High-Strength Reinforced Concrete Interior Beam-Colunm-slab connections." Thesis, 2016. http://ndltd.ncl.edu.tw/handle/z9fj97.
Повний текст джерела國立雲林科技大學
營建工程系
104
For high-rise buildings, columns made of normal-strength reinforced concrete have large cross-sectional dimensions which cannot be accepted by end users. Using high-strength reinforcement and concrete have many advantages, including smaller member sizes, lighter structure elements, lesser steel reinforcement, longer span capability, and more space available for end users. This paper presents experiments of the sub-project “behavior, design, and modeling of new RC frame joints subjected to seismic loading” in the Taiwan New RC Project. Four new RC interior beam-column connections with transverse beams and slabs were tested according to the acceptance criteria for moment frames, evaluating the effect of transverse beams covers 1/2 or 3/4 width of the joint face. The degradation of the joint shear strength is also investigated. Four beam-column connection specimens were made with 100-MPa concrete, SD685 longitudinal reinforcement, and SD785 transverse reinforcement. Two connection specimens have precast concrete units with cast-in-place concrete joint and slabs, while the other two specimens are monolithic beam-column-slab connections. Test results show that the precast beams and columns with cast-in-place concrete joint perform as well as expected for seismic design of moment frames. Test results shows that the 1/2-column-width-wide transverse beams still have partial confinement effect. It is recommended that the nominal joint strength between calculated by linear interpolation between 1.25√(f_c^' ) MPa(15√(f_c^' ) psi) and 1.67√(f_c^' ) MPa(20√(f_c^' ) psi) for transverse beams cover 1/2 and 3/4 width of the column, respectively.
Argudo, Jaime Fernando. "Non-destructive evaluation of gravity load carrying capacity and lateral load damage of reinforced concrete slab-column connections." Thesis, 2006. http://hdl.handle.net/2152/2458.
Повний текст джерелаAkinwale, Abiodun Ebebezer. "The effect of South African quaternary supplementary cementitious blends on corrosion behaviour of concrete reinforcement in chloride and Sulphate media." Diss., 2018. http://hdl.handle.net/10500/25242.
Повний текст джерелаCivil and Chemical Engineering
M. Tech. (Chemical Engineering)
"Behavior and modeling of reinforced concrete slab-column connections." Thesis, 2007. http://hdl.handle.net/2152/3046.
Повний текст джерелаTian, Ying 1971. "Behavior and modeling of reinforced concrete slab-column connections." 2007. http://hdl.handle.net/2152/13220.
Повний текст джерелаYang, Shu Yin, and 楊書茵. "The testing and comparison of the slap strength for badminton rackets with Taiwan self-owned brand." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/94682086985808561881.
Повний текст джерела國立屏東科技大學
工業管理系所
102
Currently, about 200 million people in Taiwan take badminton as fitness and leisure activity. In terms of competition, the trend is to develop a faster, more comprehensive, more offensive, and more variable tactic. In order to increase the speed of the ball, more and more badminton manufacturers have implanted new technology into the design and manufacturing process of the rackets, apart from improving training methods. Domestically, there have been several companies producing badminton rackets. Despite fair quality and the patents, domestic manufacturers cannot stand the competition against foreign companies due to the limited R&;D energy and budget. For a recently established brand facing so many competitors, how to build and deliver the corporate image, and furthermore marketing the brand has become a major challenge. This research together with the case manufacturer, have chosen rackets from Japanese brand Y which has the highest market share, and others from the case company-brand C. In a combination of different pounds and slap shot line frequency, we respectively test the slapping strength from the nine regions on the rackets. Then we use experimental design and analysis to compare the slapping strength and the sweet spot between these two brands. Customers can choose the suitable badminton rackets accordingly.
Khuzwayo, Bonga PraiseGod. "Improving efficiency and effectiveness in the design, manufacturing and construction of the beam and block slab systems." Thesis, 2015. http://hdl.handle.net/10321/1389.
Повний текст джерелаBeam and block slab systems have become a preferred suspended flooring technology in South Africa. Their structural efficiency and relatively low cost makes them suitable for low to medium cost developments. Like all other structural components, they are required to demonstrate sound structural integrity. Concerns were raised by some manufacturers and users in Durban (South Africa) about (a) the lack of basic technical information which makes it difficult to identify methods of improving efficiency and effectiveness of these flooring systems in general, (b) the efficiency and effectiveness of concrete masonry rebated filler blocks - with respect to the load carrying capacity and protecting the structural topping from fire, (c) what constitutes acceptable quality of a deliberately roughened precast concrete surface, (d) interfacial tensile bond strength of special connections and (e) an alternative rib that can span 5 metres without temporary props. These issues were investigated by the student. Thus, this project aimed at improving the structural efficiency and effectiveness in designing, manufacturing and constructing beam and block slab systems was undertaken in Durban, South Africa, between 2012 and 2013. Pilot studies (involving questionnaires), interviews with manufacturers, site visits, and testing of non-structural and structural components were also undertaken. The first aim (in order to address concern (a)) was to provide users of beam and block slab systems with basic technical information about the possible ways to improve efficiency and effectiveness in the design, manufacturing and construction of beam and block slab systems by undertaking an exploratory (pilot) study to better understand users of these systems concerns. The second aim (to address concern (b)) was to investigate, by conducting a series of strength to weight ratio tests, how efficient or inefficient these filler blocks are, examine the structural integrity with respect to the integrity of the manufacturing methodologies and the product thereof, and formulate a method to quantify the fire-resistivity of concrete masonry rebated filler blocks to the structural topping with respect to confining fire. The third aim (to address concern (c)) was to determine what constituted acceptable quality of a deliberately roughened precast concrete surface through a literature review and by conducting a survey to learn about the construction methodologies used by manufacturers. Site visits were undertaken to validate information given by the contractors. The fourth aim (to address concern (d)) was to determine interfacial tensile bond strength through physical testing of deliberately roughened concrete ribs which are sometimes used in special connections. The fifth aim (to address the last concern (e)) was to make an assessment by undertaking a basic comparison study between one local beam and block slab system that uses a shallow rectangular precast pretensioned rib to beam and block slab systems used in the United Kingdom and propose an ideal section (precast pretensioned rib) that spans up to 5 metres without temporary props. With respect to the first aim, it was found that the lack of technical knowledge, including access to critical information about the design philosophy, manufacturing and construction standards of these flooring systems leads to reluctance in selecting them. The outcome of the second aim is that all concrete masonry rebated filler blocks tested were found to be effective because they supported more than the required construction load but some were shown to be inefficient as more materials, such as binders, are wasted in producing over-strength filler blocks and also, undertaking trial mix designs and the testing of samples prior to batch production will reduce costs. A method is formulated in the thesis that could also show that concrete masonry rebated filler blocks provide significant protection to the structural topping thereby preventing fire progression. With respect to the third aim, although a broom or brush is effective in providing a surface roughness (Rz) of 3 mm, it is not always efficient when considering factors like the variation in uniformity, appearance of laitance and roughening frequency, which are not addressed by the South African codes. The outcome of the fourth aim is that connections should be designed such that they do not rely purely on the tensile bond strength but through reinforcing bars (or ties) taking the full tension load causing delamination. With respect to the fifth aim, a basic comparison study indicates that T-section beams are more efficient than common rectangular ribs (±150 mm wide x ±60 mm deep) since they can eliminate completely the use of temporary props for spans of up to 4.51 m. Consequently, further research is underway to design an inverted T-section rib by using high strength precast pretensioned concrete that can span up to 5 m without using temporary props.
AŠKOVÁ, Tereza. "Specifika mluvy matek malých dětí." Master's thesis, 2017. http://www.nusl.cz/ntk/nusl-364486.
Повний текст джерела