Log in

Relevant bibliographies by topics / Reinforcement in concrete / Dissertations / Theses

To see the other types of publications on this topic, follow the link: Reinforcement in concrete.

Dissertations / Theses on the topic 'Reinforcement in concrete'

Author: Grafiati

Published: 4 June 2021

Last updated: 5 February 2022

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 dissertations / theses for your research on the topic 'Reinforcement in concrete.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse dissertations / theses on a wide variety of disciplines and organise your bibliography correctly.

1

Ward-Waller, Elizabeth 1982. "Corrosion resistance of concrete reinforcement." Thesis, Massachusetts Institute of Technology, 2005. http://hdl.handle.net/1721.1/31125.

Full text

Abstract:

Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 2005.
"June 2005."
Includes bibliographical references (leaves 39-40).
The objective of this thesis is to investigate the mechanism of corrosion of steel reinforcement in concrete and epoxy coated reinforcing bars as corrosion resistant alternatives. Several case studies explore the durability and deterioration issues for epoxy-coated bars discovered through 30 years of implementation in reinforced concrete structures. The methods for predicting the end of functional service life for structures reinforced with uncoated reinforcing bars and with epoxy-coated reinforcing bars are detailed and tested in a design problem in the final section of this report.
by Elizabeth Ward-Waller.
M.Eng.

APA, Harvard, Vancouver, ISO, and other styles

2

Kravaev, Plamen, Steffen Janetzko, Thomas Gries, Bong-Gu Kang, Wolfgang Brameshuber, Maike Zell, and Josef Hegger. "Commingling Yarns for Reinforcement of Concrete." Saechsische Landesbibliothek- Staats- und Universitaetsbibliothek Dresden, 2009. http://nbn-resolving.de/urn:nbn:de:bsz:14-ds-1244040840310-74290.

Full text

Abstract:

Textile reinforced concrete (TRC) is an innovative composite material, which is being intensely and practice-oriented investigated on national and international level. In the last few years this material has gained increasing importance in the field of civil engineering. In the context of the collaborative research project SFB 532 at the RWTH Aachen University, research was carried out to understand and to predict the behaviour of different yarn structures in fine grained concrete. Based on the results, innovative commingling yarns were made of alkali-resistant glass fibres and water soluble PVA. These hybrid yarns have an open structure, which improves the penetration of the textile reinforcement by the concrete matrix. Hence, the load bearing capacity of TRC structural elements was significantly improved. This paper presents a technique for the production of such commingling yarns for concrete applications. The mechanical properties of the new yarns are determined due to tensile stress tests. The bond behaviour of the commingling yarns was investigated by pull-out- and tensile stress tests on TRC-specimens. The results of the different tests are being presented and briefly discussed.

APA, Harvard, Vancouver, ISO, and other styles

3

Thomas, Jeff Scott. "Plastic fiber rolling for concrete reinforcement." Diss., Rolla, Mo. : University of Missouri-Rolla, 1996. http://scholarsmine.mst.edu/thesis/pdf/Thomas_09007dcc805b0f25.pdf.

Full text

Abstract:

Thesis (M.S.)--University of Missouri--Rolla, 1996.
Vita. The entire thesis text is included in file. Title from title screen of thesis/dissertation PDF file (viewed November 24, 2008) Includes bibliographical references (p. 117-118).

APA, Harvard, Vancouver, ISO, and other styles

4

Sigman, Jonathan Joshua. "Behavior of concrete with composite reinforcement." Thesis, Massachusetts Institute of Technology, 1997. http://hdl.handle.net/1721.1/43375.

Full text

APA, Harvard, Vancouver, ISO, and other styles

5

QUINTANA, CONSUELO BELLO. "INFLUENCE OF TRANSVERSE REINFORCEMENT AND OF CONCRETE COVER OF LONGITUDINAL REINFORCEMENT ON THE ULTIMATE STRENGTH OF CONCRETE COLUMNS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2005. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=7986@1.

Full text

Abstract:

CONSELHO NACIONAL DE DESENVOLVIMENTO CIENTÍFICO E TECNOLÓGICO
Neste trabalho é feito o estudo da influência do cobrimento da armadura longitudinal e dos grampos suplementares na resistência de pilares de concreto submetidos à compressão excêntrica. Para este fim foram ensaiados pilares curtos, com armadura longitudinal contínua e pilares com emenda na armadura. Foi elaborado um modelo para o cálculo da distribuição da tensão normal e da tensão de aderência nas barras de emendas comprimidas que reproduziu bem o verificado experimentalmente. Mostra-se a importância da tensão de ponta na transmissão de forças na emenda. Se alerta sobre como a técnica normalmente empregada no reparo dos pilares onde as armaduras apresentam corrosão, que consiste na retirada parcial ou total do que restou do cobrimento para o tratamento e/ou substituição da armadura, e posterior reposição da camada de cobrimento, pode levar a ruptura do elemento por perda de aderência. Mostra-se como não colocar os grampos suplementares pode levar a perda da estabilidade do elemento.
In this work, the influence of the longitudinal reinforcement cover and supplementary transversal reinforcement on the ultimate strength of the concrete columns under eccentric compression is studied. For this purpose, tests on short columns with continuum and lapped spliced bars were carried out. A theoretical model for the calculation of the stress and bond distributions on the splice length is proposed and tested with the experimental data of this work, showing a good agreement. The relevance of the end bearing effect on the transmission of the forces in the splice is shown. An alert again the usual technique used to repair the corroded bars inside the column, i.e., to remove partially or totally the remaining concrete cover to treat or substitute the damaged reinforcement bars, and lately to put back the concrete cover. This technique may provide the element failure by the lost of bond between the remaining concrete surface and reinforcement bars. It is shown how the absence of supplementary transversal reinforcement can lead to the instability of column.

APA, Harvard, Vancouver, ISO, and other styles

6

McLeod, Robert G. "Minimum reinforcement for high-performance concrete slabs." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0027/MQ31397.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

7

Gowripalan, N. "Reinforcement of concrete elements with modified polymers." Thesis, University of Leeds, 1987. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.378032.

Full text

APA, Harvard, Vancouver, ISO, and other styles

8

Yang, Yuanzhang. "Novel reinforcement for flexibly-formed concrete structures." Thesis, University of Bath, 2018. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.767581.

Full text

Abstract:

Concrete is the most widely used artificial material around the world, the productionof which is associated with over 5% of total carbon emissions. Conventional concrete structures have prismatic geometries partly due to rigid formworks, resulting in inefficient use of materials. Fabric formwork has been used to enable structural optimisation, capitalising on the flexibility of woven fabrics and unique fluidity of wet concrete. However, a significant drawback is the complexity of fabricating steel reinforcement cages for flexibly formed concrete elements, which normally have variable-depth geometries. Both curving flexural reinforcement into the designed profiles and producing shear links of variable dimensions requires additional costs of time and labour. In this dissertation, a new reinforcing system, Wound-Fibre-Reinforced Polymer (W-FRP), is proposed as a durable alternative for the reinforcement of flexibly formed concrete beams, thereby unlocking the potential to minimise carbon emissions associated with concrete construction. An automated method has been developed to produce W-FRP cages, which are light-weight, easily transported and adaptable to many beam geometries created using fabric formwork. Based on the design and optimisation process developedin this research, three series of structural testing were undertaken to investigate the structural behaviour of W-FRP reinforced concrete beams with both prismatic and variable-depth geometries. Modelling and parametric analysis are undertaken to achieve the optimum design of fabric formed T beams reinforced with W-FRP. Through testing and analysis, further practical guidance is provided for designers. The experimental and theoretical research in this thesis has shown the great effectiveness and constructability of the W-FRP reinforcing system, with which up to 23% concrete saving can be achieved without compromising structural performance. The geometry, W-FRP shear reinforcement, and anchorage design have been shown as the key factors influencing the structural behaviour of W-FRP reinforced beams. It is possible to optimise the W-FRP patterns to achieve up to 50% increase in shear performance without additional reinforcement use. Capitalising on flexible fabric formwork and W-FRP shear reinforcement, this thesis demonstrates that constructing more durable and sustainable concrete structures can be achieved in a feasible and practical manner.

APA, Harvard, Vancouver, ISO, and other styles

9

Shapiro, Nathan. "Optimal fiber yield strength for concrete reinforcement." Thesis, Massachusetts Institute of Technology, 1995. http://hdl.handle.net/1721.1/38044.

Full text

APA, Harvard, Vancouver, ISO, and other styles

10

Yu, Jianru. "Stress transfer between FRP reinforcement and concrete." Thesis, University of Bristol, 2007. http://hdl.handle.net/1983/e1707871-89d2-48be-8633-4468d3e82bc1.

Full text

Abstract:

This thesis investigates gaps in the current understanding of some key aspects of Fibre Reinforced Polymer (FRP) strengthened reinforced concrete (RC) members. There are four important issues have been investigated. Firstly, a novel pullout test was developed to investigate the stress transfer mechanics and failure modes of near surface mounted (NSM) FRP strengthened RC blocks at a fundamental level. Secondly, the (FEA) was used to gain a detailed understanding of stress distribution both along the bond line and through the thickness of the adhesive layer for the RC members strengthened either by NSM or externally bonded plate (EBP) FRP technique.

APA, Harvard, Vancouver, ISO, and other styles

11

De, Vial Christophe. "Performance of reinforcement lap splices in concrete masonry." Pullman, Wash. : Washington State University, 2009. http://www.dissertations.wsu.edu/Thesis/Fall2009/C_de-Vial_11024236.pdf.

Full text

Abstract:

Thesis (M.S. in in civil engineering)--Washington State University, December 2009.
Title from PDF title page (viewed on Jan. 26, 2010). "Department of Civil and Environmental Engineering." Includes bibliographical references (p. 42).

APA, Harvard, Vancouver, ISO, and other styles

12

Son, Sunghoon. "An investigation into the application of concrete, concrete additive and concrete reinforcement in contemporary sculpture." Thesis, University of Newcastle upon Tyne, 2008. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.506507.

Full text

APA, Harvard, Vancouver, ISO, and other styles

13

Palumbo, Nicolino. "Accelerated corrosion testing of steel reinforcement in concrete." Thesis, McGill University, 1991. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=60681.

Full text

Abstract:

In the last few decades, there has been an increasing worldwide problem of deterioration of reinforced concrete structures, caused primarily by the corrosion of the steel reinforcement embedded within the concrete. Several factors can influence the corrosion process in different types of inservice structures. This thesis reviews the basic principles of the reinforcement corrosion. Various protection and rehabilitation schemes that can be undertaken in the repair of deteriorated concrete structures are presented. In particular, three specific types of structures in the Montreal region which have undergone rehabilitation are presented as typical case studies. Additionally, major research work done in the area of reinforcement corrosion over the last twenty years is reviewed.
This thesis reports the results of an experimental research program carried out at McGill University dealing with accelerated electrochemical corrosion testing of reinforced concrete. The main objective of this study is to determine the importance and influence of the depth of the concrete cover thickness on the rate of corrosion of steel reinforcement and thereby, on the resistance of concrete. Appropriate conclusions and recommendations regarding the construction variables affecting the corrosion process are brought forth.
These conclusions and recommendations can be summarized.

APA, Harvard, Vancouver, ISO, and other styles

14

Yoshida, Yoichi. "Shear reinforcement for large lightly reinforced concrete members." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2000. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape4/PQDD_0013/MQ53382.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

15

Constantinou, Anastasia. "The corrosion of steel reinforcement in carbonated concrete." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362540.

Full text

APA, Harvard, Vancouver, ISO, and other styles

16

Holloway, Mark. "Corrosion of steel reinforcement in slag-based concrete." Thesis, University of Oxford, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.365811.

Full text

APA, Harvard, Vancouver, ISO, and other styles

17

Teo, W. T. "Adjusted reinforcement for reinforced concrete beams in shear." Thesis, Queen's University Belfast, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.419409.

Full text

APA, Harvard, Vancouver, ISO, and other styles

18

BUFFONI, SALETE SOUZA DE OLIVEIRA. "BUCKLING ANALYSIS OF LONGITUDINAL REINFORCEMENT IN CONCRETE COLUMNS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 2004. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=5517@1.

Full text

Abstract:

COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR
A flambagem das armaduras longitudinais em pilares de concreto armado pode ocorrer na região entre dois estribos consecutivos, ou pode envolver um certo número de estribos. As normas de projeto existentes não fornecem uma metodologia apropriada para o dimensionamento dos estribos em diferentes situações. O presente trabalho tem por objetivo desenvolver uma formulação que permita analisar a flambagem das armaduras longitudinais em pilares de concreto armado submetidos a carregamento axial levando em conta o espaçamento entre os estribos, o diâmetro e arranjo dos estribos na seção transversal e o diâmetro das armaduras longitudinais. Para este propósito um método analítico para a avaliação da flambagem da armadura longitudinal é proposto, considerando-se as barras longitudinais restringidas pela rigidez axial ou à flexão dos estribos. Admite-se que a armadura longitudinal funciona como uma coluna esbelta. Consideram-se duas formas de modelagem da atuação dos estribos: como apoios elásticos discretos e como base elástica contínua. O presente trabalho trata a coluna com um ou mais modos de deformação, incluindo certas não- linearidades. São fornecidos cargas críticas e caminhos pós-críticos para tais casos. Como resultado deste estudo, apresenta-se uma proposta para dimensionamento racional dos estribos que permite estudar diferentes alternativas em um ábaco de utilização simples para projeto. Apresentam-se comparações com resultados experimentais da literatura em pilares de concreto armado. Isto permite uma avaliação crítica dos desenvolvimentos teóricos realizados e da forma proposta de dimensionamento racional dos estribos.
Buckling of longitudinal reinforcement in reinforced concrete columns may occur in the region between two consecutive ties, or may involve a number of ties. The existing design code specifications do not provide an appropriate methodology for the design of the transversal reinforcement in different situations. The main objective of the present work is to develop a formulation to allow to analyze the buckling of longitudinal bars in reinforced concrete columns taking into account the tie spacing, the diameter and arrangement of the ties in the cross section and the longitudinal bar diameter. For this purpose an analytical method for the evaluation of the buckling load of longitudinal bars is described, as a function of the constraint imposed by the axial or flexural stiffness of the stirrups. The longitudinal bar is considered as a column deforming according to thin beam theory. The tie action is described either by a set discrete elastic supports or by a continuous elastic foundation. The theoretical analysis considers the column with one or more deformation modes, with some degree of nonlinearity, including the analysis of post-critical equilibrium paths. As a result of this study, rational criteria for spacing and sizing of transversal reinforcement are derived, allowing to study different alternatives in an abacus of simple use for design. Several comparisons with the results obtained experimentally by other authors in reinforced concrete columns are presented, allowing for an evaluation of the validity of the theoretical developments and the rational design methodology proposed herein.

APA, Harvard, Vancouver, ISO, and other styles

19

Stratford, Timothy John. "The shear of concrete with elastic FRP reinforcement." Thesis, University of Cambridge, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621730.

Full text

APA, Harvard, Vancouver, ISO, and other styles

20

Gavrell, Cecilia, and Ludvig Reuterswärd. "An Automated Process for Concrete Reinforcement Layout Design." Thesis, KTH, Bro- och stålbyggnad, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-231263.

Full text

Abstract:

As many tasks considering structural design in civil engineering become digitalised, the possibility of creating a more effective workflow increases. The development of computer programs that can handle large amounts of data and assist the decision making during design process increases the requirement of the data management to fully utilize the potential of a digital workflow. The design of reinforcement layout of concrete structures is time demanding and often performed manually. These characteristics of a workflow indicates that it may be suitable to be subject to automation. The aim of this thesis is to highlight the potential and the difficulties of using automated design procedures in civil engineering with focus on reinforcement layout design. Specifically, the selection of straight rebars and their placement within concrete structures has been studied with respect to buildability and the amount of reinforcement used. A computer program has been developed to select rebar diameters and arrangement, satisfying the required amount of reinforcement as well as some of the rules according to the Eurocode standard. In order to find feasible solutions, an optimization of the amount of reinforcement as well as different measures of buildability is performed, using a genetic algorithm. The result from two case studies showed that the program managed to perform tasks similar to an engineer and create design solutions which reduced the amount of reinforcement and the number of rebar types. Furthermore, it was shown that consideration to the identified buildability parameters played an important role in finding an optimal solution. The findings indicate that the design of reinforcement layout may be automated and that a more effective workflow can be achieved.
I takt med att fler delar av projekteringen av anläggningskonstruktioner blir digitaliserade ökar möjligheterna för att effektivisera arbetet. Utvecklandet av datorprogram som kan hantera mycket information och ge stöd till beslutsfattande ställer också krav på hanterandet av denna data för att utnyttja den fulla potentialen av ett digitaliserat arbetsflöde. Arbetsprocessen vid armering av betongkonstruktioner är tidskrävande och utförs idag ofta helt eller delvis för hand. Sådana processer bär karaktärsdrag som tyder på att de är lämpade för automatisering. Målet med studien är att undersöka problematiken kring att automatisera arbetsprocesser vid projektering av anläggningskonstruktioner med inriktning på armering av betongkonstruktioner. Specifikt, så har valet av raka armeringsjärn och dess placering i betongkonstruktioner studerats med avseende på byggbarhet och armeringsmängder. Ett datorprogram har utvecklats för att välja armeringsjärn och dess placering för ett givet behov och ett antal krav som ställs enligt Eurokod. För att hitta en möjlig lösning är problemet formulerat som en optimering av armeringsmängd och olika mått på byggbarhet. Optimeringen genomfördes med en genetisk algoritm. Resultatet från två fallstudier visar att programmet lyckades genomföra konstruktörens arbetsuppgifter och skapa lösningar som minskade mängden använd armering och antalet olika typer av armeringsjärn samtidigt som de identifierade måtten på byggbarhet främjades. Vidare visade resultatet att de identifierade byggbarhetsparametrarna spelade en viktig roll för att finna en optimal lösning. Detta indikerar att det är möjligt att automatisera denna process och att ett effektivare arbetsflöde kan erhållas.

APA, Harvard, Vancouver, ISO, and other styles

21

Alami, Fikri. "CFRP fabrics as internal reinforcement in concrete beams." Thesis, University of Southampton, 2017. https://eprints.soton.ac.uk/418337/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

22

Reis, Jonathan M. "Structural Concrete Design with High-Strength Steel Reinforcement." University of Cincinnati / OhioLINK, 2010. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1277124990.

Full text

APA, Harvard, Vancouver, ISO, and other styles

23

Alrshoudi, Fahed Abdullah S. "Textile reinforced concrete : design methodology and novel reinforcement." Thesis, University of Leeds, 2015. http://etheses.whiterose.ac.uk/10163/.

Full text

Abstract:

Fibre reinforcement has been used to reinforce concrete members for decades. It has combined well with concrete to help control cracking and increase toughness and other properties such as corrosion resistance. The use of traditional fibre reinforcement has led to the development of a new material called textile reinforcement (multifilament continuous fibre) which can also be used as the main reinforcement instead of steel reinforcement. This study experimentally investigates concrete beams reinforced only with carbon textile material (TRC beams). The tensile strength of textile reinforcement and pull out strength of TRC were measured. Four-point bending tests were performed on 76 beams (small and large scale beams). Several parameters such as volume fraction and reinforcement layout were studied in order to investigate their effect on TRC beam behaviour. The results showed that with the correct layout and geometry of textile reinforcement, these reinforced concrete beams, providing they had sufficient cover thickness, would perform well. Also, the results confirmed that the bond between the concrete and textile reinforcement plays a vital role in TRC beam performance. The behaviour of the TRC beams was compared with that of the steel reinforced concrete (SRC) beams; a major advantage of the TRC beam was the reduced crack widths. This study finishes by proposing a design methodology for TRC beams. Guidance covers flexural design, predictions for moment-curvature, and predictions for crack width of TRC beams.

APA, Harvard, Vancouver, ISO, and other styles

24

Du, Yingang. "Effect of reinforcement corrosion on structural concrete ductility." Thesis, University of Birmingham, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368516.

Full text

Abstract:

This thesis presents the experimental and analytical results to investigate the effect of corrosion on the mechanical properties of reinforcing bars and concrete beams, with particular reference to their ductility. In the experimental works, specimens were electrochemically corroded, before they were loaded to failure. In the finite element analysis, the corrosion of reinforcement was modelled as either internal pressure or radial expansion around corroded bars. The study indicates that the amount of corrosion to cause cracking at the bar and concrete surfaces almost linearly increased with the bar diameter and ratio of cover to diameter, respectively. No matter whether concrete cover c increased or bar distance S decreased, once the ratio of S / c became less than 2.5, corrosion cracks first propagated internally between the bars and caused delamination. Although corrosion did not alter the shape of force-extension curves substantially, it decreased bar strength and, especially, ductility greatly. Furthermore, although the reductions of strengths were identical, the ductility of bars corroded in concrete decreased more rapidly than that of bare corroded bars. Corrosion decreased beam strength and altered its ductility and failure mode. When the cracking of compressive concrete or the reduction of tensile bar area dominated beam response, corrosion increased beam ductility and caused a beam to fail in a less brittle and even ductile manner. When the deterioration of bond strength or the reduction of steel ductility controlled beam behaviour, however, corrosion decreased beam ductility and led the beam to fail in a less ductile and even brittle manner. There is a concern regarding the ductility of reinforcing bars and under-reinforced beams if the amount of corrosion exceeds 100/0, since bar ultimate strain decreased below the minimum requirements prescribed in the Model Code 90 for situations requiring high ductility.

APA, Harvard, Vancouver, ISO, and other styles

25

Abdullah, Mohd Sabri. "Reinforced concrete beams with steel plates for shear." Thesis, University of Dundee, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.342881.

Full text

APA, Harvard, Vancouver, ISO, and other styles

26

El-Belbol, Said Mouhamed Toufic. "Acceleration of chloride ion diffusion in concrete." Thesis, Imperial College London, 1990. http://hdl.handle.net/10044/1/7637.

Full text

APA, Harvard, Vancouver, ISO, and other styles

27

Yu, Zhenmin. "Relative bond characteristics of epoxy-coated reinforcement." Thesis, University of Leeds, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.277400.

Full text

APA, Harvard, Vancouver, ISO, and other styles

28

Jean-Louis, Marjorie. "Non-destructive corrosion monitoring of steel reinforcement in concrete." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99770.

Full text

Abstract:

The inadequate and inaccurate application of corrosion monitoring techniques for testing reinforced concrete structures had led to considerable early deterioration of these facilities and has resulted in high restoration and replacement costs. The prospect and diligent use of readily available early damage detection tools for use in regular maintenance of these structures could permit timely interventions for restoration and upkeep.
This research program was aimed at determining the effectiveness of selected nondestructive testing methods as reliable indicators of early onset corrosion in steel-reinforced concrete. The methodology analyzed the onset of corrosion in a set of steel reinforcing rebars at a specific depth from the concrete surface, and used the resulting data as a predictor of corrosion activity in other reinforcing bars at different depths.
Two series of tests were conducted: the first series included nine individually reinforced concrete samples with varying cover thicknesses; the second series consisted of nine reinforcing steel bars, distributed equally in concrete specimens at different depths from the concrete cover. All specimens were subjected to accelerated corrosion using methods developed at McGill University to reproduce corrosion of steel rebars in a naturally aggressive environment as closely as possible.
The research results concur with the findings of other research programs, affirming that these monitoring tools are adequate predictors of corrosion. Nonetheless, they lack precision and are unable to track the time to corrosion initiation in structural concrete elements.

APA, Harvard, Vancouver, ISO, and other styles

29

Baena, Muñoz Marta. "Study of bond behaviour between FRP reinforcement and concrete." Doctoral thesis, Universitat de Girona, 2011. http://hdl.handle.net/10803/7771.

Full text

Abstract:

El uso de barras de materiales compuestos (FRP) se propone como una alternativa efectiva para las tradicionales estructuras de hormigón armadas con acero que sufren corrosión en ambientes agresivos. La aceptación de estos materiales en el mundo de la construcción está condicionada a la compresión de su comportamiento estructural. Este trabajo estudia el comportamiento adherente entre barras de FRP y hormigón mediante dos programas experimentales. El primero incluye la caracterización de la adherencia entre barras de FRP y hormigón mediante ensayos de pull-out y el segundo estudia el proceso de fisuración de tirantes de hormigón reforzados con barras de GFRP mediante ensayo a tracción directa. El trabajo se concluye con el desarrollo de un modelo numérico para la simulación del comportamiento de elementos de hormigón reforzado bajo cargas de tracción. La flexibilidad del modelo lo convierte en una herramienta flexible para la realización de un estudio paramétrico sobre las variables que influyen en el proceso de fisuración.
The use of Fibre Reinforced Polymers (FRP) as reinforcement in concrete structures is considered to be a possible alternative to steel in those situations where corrosion is present. The full acceptance of FRP reinforcement in concrete construction is contingent on a complete study and comprehension of all aspects of their structural performance. This thesis investigates the bond behaviour between Fibre Reinforced Polymer (FRP) reinforcement and concrete. Two experimental programs were conducted. In the first program the role of the variables which affect the bond behaviour was studied through pull-out test. In the second program, GFRP RC members were tested in tension to study their cracking response. To conclude the thesis, a numerical model was developed to simulate the cracking behaviour of RC tensile members. Since the model was flexible enough to include any "user-defined" bond-slip law and variable materials' properties, a parametric study was conducted to analyze which are the variables that influence the cracking behaviour.

APA, Harvard, Vancouver, ISO, and other styles

30

McCarthy, Michael John. "Chloride and carbonation-induced reinforcement corrosion in PFA concrete." Thesis, University of Dundee, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.490143.

Full text

APA, Harvard, Vancouver, ISO, and other styles

31

Whitehead, Paul Arthur. "Shear strength of concrete containing fibre-reinforced-plastic reinforcement." Thesis, University of Bath, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.275880.

Full text

APA, Harvard, Vancouver, ISO, and other styles

32

Samadian, Fariborz. "Investigation of shear reinforcement for reinforced concrete flat slabs." Thesis, University of Westminster, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362692.

Full text

APA, Harvard, Vancouver, ISO, and other styles

33

Kesse, Gyamera. "Concrete beams with external prestressed carbon FRP shear reinforcement." Thesis, University of Cambridge, 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.615688.

Full text

APA, Harvard, Vancouver, ISO, and other styles

34

Ward, John Charlton III. "C-Grid as Shear Reinforcement in Concrete Bridge Girders." Thesis, Virginia Tech, 2016. http://hdl.handle.net/10919/64988.

Full text

Abstract:

Corrosion of reinforcing steel causes shorter life spans in bridges throughout the United States. The use of carbon fiber reinforced polymer (CFRP) materials as the flexural reinforcement in bridge girders has been extensively studied. However, CFRP transverse reinforcement has not been as rigorously investigated, and many studies have focused on CFCC stirrups. The use of C-Grid as an option for transverse reinforcing has not been previously investigated. This thesis concludes that C-Grid is a viable shear design option and presents the initial recommendations for design methods. These methods provide a basis for the design of C-Grid shear reinforcing that could be used as a starting point for future testing of full scale specimens. This testing program first determined the mechanical properties of C-Grid and its development length. Four 18 ft long 19 in. deep beams, modeled after prestressed Bulb-T beams, were created to test the C-Grid, as well as steel and CFCC stirrups. The beams were loaded with a single point load closer to one end to create a larger shear load for a given flexural moment. Overall beam displacement was measured to determine when flexural reinforcement yielding was reached, and beams were fitted with rosettes and instrumentation to capture initiation of shear cracking. Shear capacity calculations following four methods were compared to test results. The design method should follow the AASHTO modified compression field theory with equations for β and θ. The manufacturer's guaranteed strength should be used for design as long as that strength is the average reduced by three standard deviations. Shear crack widths are controlled to a similar size as steel stirrups when using at least two layers of grid.
Master of Science

APA, Harvard, Vancouver, ISO, and other styles

35

Gao, Zhicheng. "Corrosion Damage of Reinforcement Embedded in Reinforced Concrete Slab." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1478174479305336.

Full text

APA, Harvard, Vancouver, ISO, and other styles

36

Alzyoud, Sukina. "Effect of reinforcement spacers on concrete microstructure and durability." Thesis, Imperial College London, 2015. http://hdl.handle.net/10044/1/33257.

Full text

Abstract:

Reinforcement spacers (i.e. bar supports, chairs) are crucial elements of reinforced concrete, but their influence on the microstructure and long-term durability is not clear. This study investigates the effect caused by plastic and cementitious spacers, and steel wire chairs combined with different aggregate sizes, curing and conditioning regimes on the transport properties, microstructure and chloride-induced corrosion of concrete structures. Concrete cylindrical samples were prepared with 25 and 50 mm high plastic, steel and cementitious spacers. Samples were then cured, conditioned and tested for oxygen diffusivity, oxygen permeability, water sorptivity and chloride diffusivity. Selected samples were pressure impregnated with fluorescent epoxy to study the extent and spatial distribution of epoxy intrusion. The interfacial zone between the spacer and concrete was examined using field-emission scanning electron microscope in the backscattered electron (BSE) mode. The ingress of chloride, particularly near the interface between spacers and concrete matrix was studied using micro X-ray fluorescence (μXRF). The effect of plastic and cementitious spacers on chloride- induced corrosion via capillary rise and cyclic wetting/drying was investigated using small reinforced concrete beams. The feasibility of improving the bond between spacer and concrete by increasing surface roughness of plastic spacers was also investigated. Results show that concrete samples containing plastic spacers consistently gave the least resistance to transport and the highest epoxy penetration followed by samples with cementitious spacers, and then steel spacers. The control samples (samples without spacers) had the highest resistance to transport in all cases. The epoxy penetration occurred mainly through the spacer-concrete interface. The microstructure of the spacer-concrete interface showed significantly lower cement content and higher porosity compared to 'bulk paste' farther away form the interface. Higher penetration of chloride ions was detected along spacer-concrete interface compared to the control sample or the bulk paste farther away. It is evident that spacers initiate early corrosion and this may reduce the service-life of reinforced concrete structures. The implications of these findings on durability of concrete structures are discussed. Several recommendations to improve the bond at the interface between spacer and concrete are presented.

APA, Harvard, Vancouver, ISO, and other styles

37

Levy, Kelly Rebecca. "Bond behavior of prestressed reinforcement in beams constructed with self-consolidating concrete." Auburn, Ala., 2007. http://repo.lib.auburn.edu/2007%20Spring%20Theses/LEVY_KELLY_6.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

38

Podgorniak-Stanik, Bogdan Andrzej. "The influence of concrete strength, distribution of longitudinal reinforcement, amount of transverse reinforcement and member size on shear strength of reinforced concrete members." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0006/MQ34123.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

39

Insel, Emre. "Shear testing of concrete sandwich panels with carbon fiber grid reinforcement." Laramie, Wyo. : University of Wyoming, 2007. http://proquest.umi.com/pqdweb?did=1313919671&sid=1&Fmt=2&clientId=18949&RQT=309&VName=PQD.

Full text

APA, Harvard, Vancouver, ISO, and other styles

40

Li, Yang. "Blast Performance of Reiforced Concrete Beams Constructed with High-Strength Concrete and High-Strength Reinforcement." Thesis, Université d'Ottawa / University of Ottawa, 2016. http://hdl.handle.net/10393/35261.

Full text

Abstract:

This thesis focuses on the dynamic and static behaviour of reinforced concrete beams built using high-strength concrete and high-strength steel reinforcement. As part of this study, a total of 8 high-strength concrete beams, built with and without steel fibres, and reinforced with high strength ASTM A1035 bars are tested under simulated blast loading using the University of Ottawa shock-tube, with an additional 3 companion beams tested under quasi-static loading. The variables considered in this study include: concrete type, fibre content, steel reinforcement ratio and steel reinforcement type. The behaviour of the beams with high-strength steel bars is compared to a companion set of beams reinforced with conventional steel reinforcement. The criteria used to evaluate the blast performance of the beams includes: overall blast capacity, maximum and residual displacements, secondary fragmentation and crack control. The dynamic results show that high strength concrete beams reinforced with high-strength steel are able to resist higher blast loads and reduce displacements when compared to companion beams with conventional steel reinforcement. The results also demonstrate that the addition of steel fibres is effective in controlling crack formation, minimizing secondary blast fragments, reducing displacements and further increasing overall blast capacity. However, the use of high-strength steel and high-strength concrete also shows potential for brittle failures under extreme blast pressures. The static results show that specimens with high-strength steel bars do not increase beam stiffness, but significantly increase peak load carrying capacity when compared to beams with the same ratio of conventional steel reinforcement. The analytical research program aims at predicting the response of the test beams using dynamic inelastic single-degree-of-freedom (SDOF) analysis and includes a sensitivity analysis examining the effect of various modelling parameters on the response predictions. Overall the analytical results demonstrate that SDOF analysis can be used to predict the blast response of beams built with high-strength concrete and steel reinforcement with acceptable accuracy.

APA, Harvard, Vancouver, ISO, and other styles

41

Angelakos, Dino. "The influence of concrete strength and longitudinal reinforcement ratio on the shear strength of large-size reinforced concrete beams with, and without, transverse reinforcement." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0003/MQ45934.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

42

Garcia, Talia. "The effect of reinforcement on alkali-aggregate reactivity in concrete /." Thesis, McGill University, 2004. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=80013.

Full text

Abstract:

Alkali-aggregate reactivity (AAR) is known to cause detrimental effects in reinforced and prestressed concrete structures. To be able to design for these disruptive deformations and structural distress, it is necessary to have a clear understanding of the basic mechanics of reactivity, and its effect on cracking, engineering properties of the deteriorating concrete, and the resulting structural deformations.
This research will provide a brief overview of alkali-aggregate reactions in concrete, the causes of the problem and its symptoms in existing concrete structures. The goal of this study is to assess the role of the steel reinforcement on the response of AAR-affected concrete; the paper will also review how the reaction affects the mechanical properties of concrete. Expansion and compression tests as well as Poisson's elastic modulus are being studied. The results show that reinforcement has a significant effect in decreasing the expansive effect of the AAR.
Some preventive measures are reviewed, focusing on the minimization of AAR with the use of quality aggregate, portland cement, and mineral and chemical admixtures.

APA, Harvard, Vancouver, ISO, and other styles

43

Shehata, Emile F. G. "Fibre-reinforced polymer (FRP) for shear reinforcement in concrete structures." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1999. http://www.collectionscanada.ca/obj/s4/f2/dsk1/tape8/PQDD_0001/NQ41626.pdf.

Full text

APA, Harvard, Vancouver, ISO, and other styles

44

Chadwick, Rennie. "Performance of concrete repair materials as corrosion protection for reinforcement." Thesis, University of Surrey, 1993. http://epubs.surrey.ac.uk/757/.

Full text

APA, Harvard, Vancouver, ISO, and other styles

45

Ofori-Darko, Francis Kwame. "Crack frequency and the minimisation of reinforcement corrosion in concrete." Thesis, London South Bank University, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310062.

Full text

APA, Harvard, Vancouver, ISO, and other styles

46

Gomes, Ronaldo Barros. "Punching resistance of reinforced concrete flat slabs with shear reinforcement." Thesis, University of Westminster, 1991. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.303158.

Full text

APA, Harvard, Vancouver, ISO, and other styles

47

Nokhasteh, Mohammad-Ali. "Corrosion damaged reinforced concrete beams with debonded tensile span reinforcement." Thesis, University College London (University of London), 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.294542.

Full text

APA, Harvard, Vancouver, ISO, and other styles

48

Nandy, Sujay. "Assessing external reinforcement on reinforced concrete beams using neural networks." [Gainesville, Fla.] : University of Florida, 2001. http://etd.fcla.edu/etd/uf/2001/anp1590/thesis%5Fetd%5Fversion.PDF.

Full text

Abstract:

Thesis (M.S.B.C.)--University of Florida, 2001.
Title from first page of PDF file. Document formatted into pages; contains ix, 144 p.; also contains graphics. Vita. Includes bibliographical references (p. 61-63).

APA, Harvard, Vancouver, ISO, and other styles

49

Garbis, Leonidia Maria. "Lightweight concrete : investigations into the production of natural fiber reinforcement." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82261.

Full text

Abstract:

Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Architecture, 2013.
Cataloged from PDF version of thesis.
Includes bibliographical references (p. 34).
The purpose of this study is to investigate the benefits of adding natural fiber tensile reinforcement to aerated concrete. Concrete is a great composite material which can be created in various proportions and with various materials to alter its strength, density and porosity, amongst other properties. Concrete which is used commonly in construction of columns, beams, and slabs acts well in compression but fails under tension. The common solution is to reinforce the structure in areas where it experiences tension with steel. There are other materials besides steel which also take tension well. Natural fibers for example come in various strengths and types and would create lighter and perhaps more sustainable beam designs. Natural fibers have been used for their availability, workability, and high tensile strengths for centuries. This research discovers how the natural fibers distribute within the mixture and how they affect the aeration of the concrete, as well as how they affect the strength. Multiple samples are cured with different fiber types and in different proportions within the mixture. Furthermore, similar experimentation is conducted to discover an ideal ratio of aggregate to aerated concrete mix. The aggregate gives the concrete greater strength and economy, but could negatively affect the aeration. The various concrete mixes are poured and allowed to cure to maximum strength before indirect tensile tests and compression tests are conducted. The effects of creating smooth aerated concrete molds are also investigated. All experiments conducted are precursory to an ultimate tensile reinforced aerated concrete beam design with an aggregate mix and smooth surfaces.
by Leonidia Maria Garbis.
S.B.

APA, Harvard, Vancouver, ISO, and other styles

50

Fisher, Matthew John. "Experimental Evaluation of Reinforcement Methods for Concrete Beam-Column Joints." The Ohio State University, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=osu1243628129.

Full text

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!