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Rozprawy doktorskie na temat „Flexural Strength of Concrete”

Autor: Grafiati

Data publikacji: 3 czerwca 2025

Data aktualizacji: 31 lipca 2025

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1

Choi, Wonchang. "Flexural Behavior of Prestressed Girder with High Strength Concrete." NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-10302006-114609/.

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The advantages of using high strength concrete (HSC) have led to an increase in the typical span and a reduction of the weight of prestressed girders used for bridges. However, growing demands to utilize HSC require a reassessment of current provisions of the design codes. The objective of one of the research projects, recently initiated and sponsored by the National Cooperative Highway Research Program (NCHRP), NCHRP Project 12-64, conducted at North Carolina State University is to extend the use of the current AASHTO LRFD design specifications to include compressive strength up to 18,000 psi

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2

Yosefani, Anas. "Flexural Strength, Ductility, and Serviceability of Beams that Contain High-Strength Steel Reinforcement and High-Grade Concrete." PDXScholar, 2018. https://pdxscholar.library.pdx.edu/open_access_etds/4402.

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Utilizing the higher capacity steel in design can provide additional advantages to the concrete construction industry including a reduction of congestion, improved concrete placement, reduction in the required reinforcement and cross sections which would lead to savings in materials, shipping, and placement costs. Using high-strength reinforcement is expected to impact the design provisions of ACI 318 code and other related codes. The Applied Technology Council (ATC-115) report "Roadmap for the Use of High-Strength Reinforcement in Reinforced Concrete Design" has identified key design issues t

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3

Islam, Md Shahidul. "Shear capacity and flexural ductility of reinforced high- and normal-strength concrete beams." Thesis, Hong Kong : University of Hong Kong, 1996. http://sunzi.lib.hku.hk/hkuto/record.jsp?B1766536X.

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Higgs, Arek Tilmann. "Shear and Flexural Capacity of High Strength Prestressed Concrete Bridge Girders." DigitalCommons@USU, 2013. https://digitalcommons.usu.edu/etd/1757.

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The section of highway over the 400 South roadway in Orem, Utah is made up of two separate three span bridges. The bridges were originally constructed in 1960 and were expanded in 2004 to accommodate for one extra lane per bridge. During the fall of 2012 both bridges were scheduled for demolition and four girders were salvaged from the southernmost span of the 2004 expansion. These girders were transported to the Structural Materials And Systems Health Lab (SMASH Lab) where a series of tests were performed to determine the prestressing losses, flexural, shear, and shear-flexure capacity of the

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5

Carlin, Brian Patrick. "Investigation of the Strength and Ductility of Reinforced Concrete Beams Strengthed with CFRP Laminates." Thesis, Virginia Tech, 1998. http://hdl.handle.net/10919/36546.

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The use of fiber reinforced plastics (FRP) in repairing and strengthening bridges has been researched in recent years. In particular, attaching unidirectional FRP to the tension face of reinforced concrete beams has provided an increase in stiffness and load capacity of the structure. However, due to the brittle nature of the unidirectional FRP, the ductility of the beam decreases. One possible solution to this problem is the use of cross-ply or off-axis FRP laminates. This thesis focuses on the investigation of the flexural behavior of reinforced concrete beams strengthened with one of tw

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6

Peng, Jun, and 彭军. "Strain gradient effects on flexural strength and ductility design of normal-strength RC beams and columns." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2012. http://hub.hku.hk/bib/B48329630.

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The stress-strain characteristics of concrete developed in flexure is very important for flexural strength design of reinforced concrete (RC) members. In current RC design codes, the stress-strain curve of concrete developed in flexure is obtained by scaling down the uni-axial stress-strain curve to account for the strain gradient effect. Therefore, the maximum concrete stress that can be developed under flexure is smaller than its uni-axial strength, and the use of which always underestimates the flexural strength of RC beams and columns even though the safety factors for materials are taken

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7

Chen, Mantai, and 陈满泰. "Combined effects of strain gradient and concrete strength on flexural strength and ductility design of RC beams and columns." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/206429.

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The stress-strain relationship of concrete in flexure is one of the essential parameters in assessing the flexural strength and ductility of reinforced concrete (RC) structures. An overview of previous research studies revealed that the presence of strain gradient would affect the maximum concrete stress and respective strain developed in flexure. Previously, researchers have conducted experimental studies to investigate and quantify the strain gradient effect on maximum concrete stress and respective strain by developing two strain-gradient-dependent factors k3 and ko for modifying the flexu

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8

Brahmachari, Koushik, of Western Sydney Hawkesbury University, of Science Technology and Agriculture Faculty, and School of Construction and Building Sciences. "Connection and flexural behaviour of steel RHS filled with high strength concrete." THESIS_FTA_CBS_BRAHMACHARI_K.xml, 1997. http://handle.uws.edu.au:8081/1959.7/526.

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Steel hollow section members filled with concrete have been frequently used in recent construction industry as columns and beams and beam-columns because of their superior performance and constructability. Previous research demonstrated that such system has large energy absorption capacity which is critical in the event of an earthquake. By filling steel RHS with concrete, the failure of the steel shell due to local buckling can be delayed and the ductility of the concrete core can be improved as a result of the confinement of the steel shell. This type of composite section may be used in vari

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9

Tabassum, Javeria, and javeriaajaz@yahoo co in. "Analysis of current methods of flexural design for high strength concrete beams." RMIT University. Civil, Environmental & Chemical Engineering, 2008. http://adt.lib.rmit.edu.au/adt/public/adt-VIT20080725.143153.

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Considerable amount of research was carried out into the properties and structural performance of high strength concrete for more than few decades. Whilst this research has produced relevant and useful results, there are several properties of high strength concrete like compressive and tensile strengths, stiffness, durability etc. that need to be evaluated and investigated to determine an accurate representation for the determination of different structural properties of beams made of high strength concrete. For this purpose, an investigation into the behaviour of beams made of higher con

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10

Brahmachari, Koushik. "Connection and flexural behaviour of steel RHS filled with high strength concrete." Thesis, View thesis, 1997. http://handle.uws.edu.au:8081/1959.7/526.

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Steel hollow section members filled with concrete have been frequently used in recent construction industry as columns and beams and beam-columns because of their superior performance and constructability. Previous research demonstrated that such system has large energy absorption capacity which is critical in the event of an earthquake. By filling steel RHS with concrete, the failure of the steel shell due to local buckling can be delayed and the ductility of the concrete core can be improved as a result of the confinement of the steel shell. This type of composite section may be used in vari

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11

Brahmachari, Koushik. "Connection and flexural behaviour of steel RHS filled with high strength concrete /." View thesis, 1997. http://library.uws.edu.au/adt-NUWS/public/adt-NUWS20030708.160244/index.html.

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Thesis (Ph. D.)--University of Western Sydney, Hawkesbury.<br>"Thesis presented for the Degree of Doctor of Philosophy, School of Construction and Building Sciences, Faculty of Science, Technology and Agriculture, University of Western Sydney, Hawkesbury, December 1997.

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12

Chau, Siu-lee. "Effects of confinement and small axial load on flexural ductility of high-strength reinforced concrete beams." Click to view the E-thesis via HKUTO, 2005. http://sunzi.lib.hku.hk/hkuto/record/B31997661.

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13

Lee, Stephen Kim Lon. "Flexural strength of reinforced concrete beams strengthened using carbon fibre reinforced composite sheets." Thesis, University of Southampton, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.420192.

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14

ARAUJO, AELLINGTON FREIRE DE. "EXPERIMENTAL STUDY ON THE FLEXURAL STRENGTH OF CONCRETE BEAMS PRESTRESSED WITH SYNTHETIC TENDONS." PONTIFÍCIA UNIVERSIDADE CATÓLICA DO RIO DE JANEIRO, 1997. http://www.maxwell.vrac.puc-rio.br/Busca_etds.php?strSecao=resultado&nrSeq=1927@1.

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COORDENAÇÃO DE APERFEIÇOAMENTO DO PESSOAL DE ENSINO SUPERIOR<br>Nos últimos anos a protensão externa tem sido empregada tanto na recuperação e reforço de estruturas existentes quanto na concepção de novas estruturas. A protensão externa pode ser feita com cabos de aço ou com cabos sintéticos. Dentre esses, podem-se destacar os cabos Parafil, cujo núcleo é constituído de fibras kevlar. Essas fibras têm alta resistência (3700MPa), alto módulo de elasticidade (126000MPa) e excelente resistência à corrosão. Neste trabalho é feito um estudo do comportamento de vigas protendidas com cabos ext

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15

Roth, Michael Jason 1975. "Flexural and tensile properties of thin, very high-strength, fiber-reinforced concrete panels." Master's thesis, Mississippi State : Mississippi State University, 2007. http://library.msstate.edu/etd/show.asp?etd=etd-11062007-215816.

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16

Nassar, Adil J. "Investigation of Transfer Length, Development Length, Flexural Strength and Prestress Loss Trend in Fully Bonded High Strength Lightweight Prestressed Girders." Thesis, Virginia Tech, 2002. http://hdl.handle.net/10919/32941.

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Encouraged by the performance of high performance normal weight composite girders, Virginia Department of Transportation has sought to exploit the use of high strength lightweight composite concrete (HSLWC) girders to achieve economies brought about by the reduction of dead loads in bridges. Transfer Length measurements conducted on two AASHTO Type IV HSLWC prestressed girders, resulted in an average transfer length of 17 inches, well below the AASHTO and ACI guidance. Two girders composed of HSLWC AASHTO Type II girders and a 48" x 8" normal weight 4000-psi concrete deck were produced. The

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17

Chau, Siu-lee, and 周小梨. "Effects of confinement and small axial load on flexural ductility of high-strength reinforced concrete beams." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2005. http://hub.hku.hk/bib/B31997661.

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18

Zhang, Lihe. "Impact resistance of high strength fiber reinforced concrete." Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/705.

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Concrete structures may be subjected to dynamic loading during their service life. Understanding the dynamic properties of concrete structures is becoming critical because of the increased concern about the dynamic loading of both civilian and military structures, and especially, the recent increase in terrorist attacks on structures. Fiber reinforced concrete (FRC) is known to exhibit superior performance in its post-peak energy absorption capacity, (i.e., toughness) under flexural and tensile loading. However, the behavior of fiber reinforced concrete under compressive impact has not previo

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19

Esposito, Alessandro. "Creep deflection of low-strength reinforced concrete flexural members strengthened with carbon fiber composite sheets." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2016. http://amslaurea.unibo.it/10340/.

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The low-strength concrete is defined as a concrete where the compressive cubic strength is less than 15 MPa. Since the beginning of the last century, many low-strength concrete buildings and bridges have been built all over the world. Being short of deeper study, composite sheets are prohibited in strengthening of low-strength reinforced concrete members (CECS 146; ACI 440). Moreover, there are few relevant information about the long-term behavior and durability of strengthened RC members. This fact undoubtedly limits the use of the composite materials in the strengthening applications, there

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20

Collins, Travis Collins. "Estimating in-situ flexural strength of heat-affected prestressed concrete beams using constituent material models." Connect to this title online, 2008. http://etd.lib.clemson.edu/documents/1219953974/.

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21

Alazemi, Athbi. "Investigate the Effects of Nano Aluminum Oxide on Compressive, Flexural Strength, and Porosity of Concrete." University of Dayton / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1544693885397299.

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Alrumaih, Mohammed Aulwai. "Investigation of the Effect of Nano SiO₂ on Porosity." University of Dayton / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=dayton155744355992274.

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Peng, Jun, and 彭軍. "Effects of strain gradient on maximun concrete stress and flexural capacity of normal-strength RC members." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2009. http://hub.hku.hk/bib/B43085787.

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Peng, Jun. "Effects of strain gradient on maximun concrete stress and flexural capacity of normal-strength RC members." Click to view the E-thesis via HKUTO, 2009. http://sunzi.lib.hku.hk/hkuto/record/B43085787.

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25

Thamboo, Julian Ajith. "Development of thin layer mortared concrete masonry." Thesis, Queensland University of Technology, 2014. https://eprints.qut.edu.au/73815/1/Julian_Thamboo_Thesis.pdf.

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This research was a step forward to developing data sets for thin layer mortared concrete masonry through systematic experimental and numerical studies. Since thin layer mortared concrete masonry is relatively new type of masonry construction, methodical research studies have been undertaken to properly address the gaps in understanding of this masonry system. As part of the ARC Linkage research project, this thesis has been developed to extend the knowledge on thin layer mortared concrete masonry.

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Trent, Justin David. "Transfer Length, Development Length, Flexural Strength, and Prestress Loss Evaluation in Pretensioned Self-Consolidating Concrete Members." Thesis, Virginia Tech, 2007. http://hdl.handle.net/10919/33161.

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The first objective of this thesis was to determine the effect of using self-consolidating concrete versus normal concrete on transfer and development lengths, and flexural strengths of prestressed members. Three small rectangular members were made, two cast with SCC mixes and one cast with a conventional mix, to determine the transfer length of each mix. Transfer lengths of both ends of each member were determined by measuring the concrete surface strains. The change in the transfer length was monitored by determining the transfer length of each member at prestress release, 7 days after re

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27

Momeni, Amir Farid. "Effect of concrete properties and prestressing steel indentation types on the development length and flexural capacity of pretensioned concrete members." Diss., Kansas State University, 2016. http://hdl.handle.net/2097/32682.

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Doctor of Philosophy<br>Civil Engineering<br>Robert J. Peterman<br>A study was conducted to determine the effect of different concrete properties and prestressing steel indentation types on development length and flexural capacity of pretensioned members. Wires and strands commonly used in the manufacturing of prestressed concrete railroad ties worldwide were selected for the study. Thirteen different 5.32-mm-diameter prestressing wire types and six different strands (four, seven-wire strands and two, three-wire strands) were used to cast prisms with a square cross section. The ratio of concre

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Nilsson, Jonas, and Peter Sargenius. "Effect of microfibrillar cellulose on concrete equivalent mortar fresh and hardened properties." Thesis, KTH, Byggvetenskap, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-60485.

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A pilot project in 2010, conducted at CBI, showed the capacity for pulp, micro fibrilars from the forest industry to act as Viscosity Modifying Agent (VMA) in concrete. This project was, however, too limited to find answers for optimal use of this kind of material. The forest industry company Stora Enso wants to find out if their pulp can be used in concrete in order to somehow improve its properties. Two micro fibrilar suspensions have been tested. The tested fibrils are in two sizes, the finer material named MFC1 has undergone more homogenization than the course material named MFC2. The fibr

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Lin, Y. "Optimum design for sustainable 'green' overlays : controlling flexural failure." Thesis, Coventry University, 2014. http://curve.coventry.ac.uk/open/items/b5ba73e5-9cb8-4a0b-ac99-c53b3c3e54ed/1.

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The target of the ‘Green Overlays’ research was a cost effective, minimal disruption, sustainable and environmentally friendly alternative to the wholesale demolition, removal and complete reconstruction of the existing structural concrete pavement. The important problem of flexural resistance for strengthening concrete pavements with structural overlays has been scrutinised. A new mix design method for steel fibre reinforced, roller compacted, polymer modified, bonded concrete overlay has been proposed. The mixes developed were characterized of high flexural strength and high bond strength wi

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Mohamed, Ahmed Abdeldayem. "Behavior, strength and flexural stiffness of circular concrete columns reinforced with FRP bars and spirals/hoops under eccentric loading." Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/11406.

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Abstract : Deterioration of concrete structures reinforced with steel bars can be seen daily in regions with aggressive weather as steel-corrosion problems worsen. Fiber-reinforced-polymers (FRP) reinforcement has proven its feasibility through different civil structural elements. Present guidelines for FRP structures in North-America and Europe have not yet handled axially loaded members, due to the lack of research and experiments. This research takes charge of providing experimental database as well as extensive analyses and design recommendations of circular concrete columns reinforced tot

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Zhang, Xuesong, and n/a. "Punching Shear Failure Analysis of Reinforced Concrete Flat Plates Using Simplified Ust Failure Criterion." Griffith University. School of Engineering, 2003. http://www4.gu.edu.au:8080/adt-root/public/adt-QGU20051104.153239.

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Failure criteria play a vital role in the numerical analysis of reinforced concrete structures. The current failure criteria can be classified into two types, namely the empirical and theoretical failure criteria. Empirical failure criteria normally lack reasonable theoretical backgrounds, while theoretical ones either involve too many parameters or ignore the effects of intermediate principal stress on the concrete strength. Based on the octahedral shear stress model and the concrete tensile strength under the state of triaxial and uniaxial stress, a new failure criterion, that is, the simpli

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Zhang, Xuesong. "Punching Shear Failure Analysis of Reinforced Concrete Flat Plates Using Simplified Ust Failure Criterion." Thesis, Griffith University, 2003. http://hdl.handle.net/10072/365777.

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Failure criteria play a vital role in the numerical analysis of reinforced concrete structures. The current failure criteria can be classified into two types, namely the empirical and theoretical failure criteria. Empirical failure criteria normally lack reasonable theoretical backgrounds, while theoretical ones either involve too many parameters or ignore the effects of intermediate principal stress on the concrete strength. Based on the octahedral shear stress model and the concrete tensile strength under the state of triaxial and uniaxial stress, a new failure criterion, that is, the simpli

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33

Mansour, Marwan. "Experimental tests on the effect of temperature on the short term behavior of FRC beams." Master's thesis, Alma Mater Studiorum - Università di Bologna, 2021.

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The effect of temperature under short term behavior on macro-synthetic polypropylene fibers reinforced concrete (MSFRC) was evaluated, to understand how this condition may affect the performance of this material. An experimental campaign of three-point bending, compressive tests and elastic modulus tests have been performed on prisms, cubes and cylinders cured at 6 temperatures, ranging from -30°C to +60°C. The results highlighted that, for the material tested, the increment of temperature causes a decrement of the peak and post-peak flexural strength. Further analysis have been done on the fi

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34

Tan, Chor Suan. "Theoretical analysis of the flexural strength and behaviour of unbonded partially prestressed concrete beams and slabs with and without bonded reinforcement." Thesis, University of Canterbury. Department of Civil Engineering, 1989. http://hdl.handle.net/10092/2450.

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A modified version of the computer program written by Chan (1986) for the analysis of unbonded prestressed concrete members under third point loading was developed. The new program carries out the analysis more quickly and efficiently while still maintaining the required accuracy level. The program was used to analyse twenty-two unbonded beams with bonded steel tested in China and twelve unbonded slabs with bonded steel and a futher six unbonded slabs without bonded steel tested at the University of Canterbury. All analytical and experimental results were compared . The comparison revealed tha

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35

Moawad, Mohamed Abdalla Mohamed Mohamed. "Flexural behavior of NSM FRP strenthened reinforced concrete beams under sustained loading." Doctoral thesis, Universitat de Girona, 2020. http://hdl.handle.net/10803/670950.

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The main objective of this work is to study the long-term and residual flexura! strength of Near Surface Mounted (NSM) strengthened Reinforced Concrete (RC) beams with Carbon Fiber Reinforced Polymers (CFRP) strips when subjected to sustained loading. This work involved twenty-eight RC beams divided into two series, A and B, with two concrete batches of different compressive strength. In each series, sorne of the beams were strengthened with CFRP strips using the NSM strengthening technique and the others were un-strengthened. Series A was divided into two groups, Al and A2, while series B was

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Robles, Sáenz Randolp Julián, and Medina Juan Carlos Sánchez. "Evaluación de pavimentos rígidos mediante la determinación de correlaciones entre el módulo de rotura a la flexión y la resistencia a la compresión para el Centro Poblado San Cristóbal de Chupán – Huaraz." Bachelor's thesis, Universidad Ricardo Palma, 2015. http://cybertesis.urp.edu.pe/handle/urp/1350.

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La resistencia a flexión y la resistencia a la compresión representan parámetros fundamentales en el correcto desarrollo de los pavimentos rígidos, porque definen la calidad del concreto, principal componente de los pavimentos rígidos, después de cumplir satisfactoriamente su ciclo de fraguado y curado. En nuestro enfoque cuantitativo, el problema principal radica en intentar efectuar ensayos de rotura a la flexión en zonas alejadas, como en el centro poblado San Cristóbal de Chupán, reconociendo que sólo es posible realizarlo en pocos laboratorios a nivel nacional. Por esta razón se determinó

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Mondo, Eleonora. "Shear Capacity of Steel Fibre Reinforced Concrete Beams without Conventional Shear Reinforcement." Thesis, KTH, Bro- och stålbyggnad, 2011. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-41016.

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While the increase in shear strength of Steel Fibre Reinforced Concrete (SFRC) is well recognized, it has yet to be found common application of this material in building structures and there is no existing national standard that treats SFRC in a systematic manner. The aim of the diploma work is to investigate the shear strength of fibre reinforced concrete beams and the available test data and analyse the latter against the mostpromising equations available in the literature. The equations investigated are:Narayanan and Darwish’s formula, the German, the RILEM and the Italian guidelines. Thirt

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Carroll, James Christopher. "Grade 300 Prestressing Strand and the Effect of Vertical Casting Position." Diss., Virginia Tech, 2009. http://hdl.handle.net/10919/28806.

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The purpose of this study was to investigate the influence an increase in strand strength and the effect the as-cast vertical location had on transfer length, development length, and flexural strength and to resolve the discrepancies regarding the definition of the top-bar/strand effect. Two types of test specimens were fabricated and tested investigating each respective item. The increase in strand strength was found to influence transfer length, development length, and flexural strength, while the as-cast vertical location was only found to influence transfer length, and in turn developmen

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39

Vinter, Václav. "Latexy modifikované cementové materiály." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216351.

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In this thesis, the development of mechanical properties and structure of latex modified cementious materials during hydration was studied. Latex modified materials are composites of inorganic cement (portland cement) and organic polymer latex. Preparation, processing and fabrication of the polymer cement material based on portland cement was optimized with aim to reach the most compact structure of the product with the finest mechanical characters. The experimental part was pointed to observe influence of the type and amount of polymer latex with focus on mechanical characters and hydration k

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40

Bastami, Roukaya. "Structural Performance of High-Strength Reinforced Concrete Beams Built with Synthetic Fibers." Thesis, Université d'Ottawa / University of Ottawa, 2019. http://hdl.handle.net/10393/39957.

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This thesis presents the results of a research program examining the effects of macro-synthetic fibers on the shear and flexural behaviour of high-strength concrete (HSC) beams subjected to static and blast loads. As part of the study, a series of seventeen fiber-reinforced HSC beams are built and tested under either quasi-static four-point bending or simulated blast loads using a shock-tube. The investigated test parameters include the effects of: macro-synthetic fibers, fiber hybridization, combined use of fibers and stirrups and longitudinal steel ratio and type. The results show that unde

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41

Arafa, Ahmed. "Assessment of strength, stiffness, and deformation capacity of concrete squat walls reinforced with GFRP bars." Thèse, Université de Sherbrooke, 2017. http://hdl.handle.net/11143/11057.

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Abstract : The present study addressed the feasibility of reinforced-concrete squat walls totally reinforced with GFRP bars to attain reasonable strength and drift requirements as specified in different codes. Nine large-scale squat walls with aspect ratio (height to length ratio) of 1.33—one reinforced with steel bars (as reference specimen) and eight totally reinforced with GFRP bars—were constructed and tested to failure under quasi-static reversed cyclic lateral loading. The key studied parameters were: (1) use of bidiagonal web reinforcement; (2) use of bidiagonal sliding reinforcement; a

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Hanuš, Petr. "Experimentální ověření vlivu typu vláken na chování vláknobetonů." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2019. http://www.nusl.cz/ntk/nusl-392039.

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This diploma thesis deals with the comparison of different properties of fibre-reinforced concrete according to the type of fibres. The main monitored property is flexural strength, tested on prisms with a cross section of 150x150 mm and a length of 600 mm. Four concretes of natural aggregate and four concrete of lightweight aggregate were prepared for the experiment. There were 2 reference concrete and 6 fibre-reinforced concrete. Three types of fibres were used: steel, polypropylene and glass. More than 2500 kg of concrete was produced. The aim of the thesis is to assess the influence of fib

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Reeves, Eric E. "Structural reliability of ultra-high performance concrete in flexure." Ohio : Ohio University, 2004. http://www.ohiolink.edu/etd/view.cgi?ohiou1177090784.

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Ganaw, Abdelhamed I. "Rheology of grout for preplaced aggregate concrete : investigation on the effect of different materials on the rheology of Portland cement based grouts and their role in the production of preplaced aggregate concrete." Thesis, University of Bradford, 2012. http://hdl.handle.net/10454/5766.

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Preplaced aggregate concrete (PAC) is produced by grouting high workability cement based grouts among the voids of compacted coarse aggregate mass. Because of its low shrinkage, PAC has been used for many repair jobs like; tunnel lines, dams and bridge piers. Moreover, it has been used for underwater construction. Grout has a major effect on the properties of produced PAC and well defined grout controls the properties of resulted PAC. The effect of types and amount of powder materials, admixtures, sand and water content on the properties of fresh and hardened grout for the production of PAC ha

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Hrout, Ghassan. "Investigate the Effect of Nano SIO2 on Porosity, Compressive and Flexural Strengths of Concrete Has 2% Fly Ash and 2% Silica Fume." University of Dayton / OhioLINK, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=dayton1608296326325322.

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Zanella, Andrigo Kemel. "ANÁLISE DAS PROPRIEDADES MECÂNICAS DE CONCRETOS PARA PAVIMENTAÇÃO EMPREGANDO DIFERENTES PROCESSOS DE CURA." Universidade Federal de Santa Maria, 2014. http://repositorio.ufsm.br/handle/1/7861.

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To develop a project sizing concrete pavement is necessary to know the mechanical properties and the different treatment processes of material to be used. This study aimed to analyze the mechanical properties such as flexural strenght, compressive strength, indirect tensile strength and static modulus of concrete paving. The three types of concrete were studied: An actual reference (typically used in paving, one with the addition of polypropylene fibers (common practice for floors), and a high strength concrete used to rapidly release the traffic. Different methods of curing were applied: chem

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Sáček, Josef. "Vysokohodnotné betony na bázi druhotných surovin." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2008. http://www.nusl.cz/ntk/nusl-216352.

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This work is devoted to study of physical-mechanical properties and structure of high performance concretes (HPC) based on portland cement. The attention is focused on possibility of substitution of economic high-cost components of concrete with utilization of secondary raw materials or cheaper components. Properties of raw materials and their influence on whole quality of concrete were tracked by various methods. Mechanical properties of prepared HPC samples were tested especially (compression and flexural strength) with further microscopic study of structure. Isoperibolic calorimetry and X-r

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Osorio, Gomez Laura Isabel. "Behavior of synthetic fiber-reinforced concrete circular columns under cyclic flexure and constant axial load." Mémoire, Université de Sherbrooke, 2008. http://savoirs.usherbrooke.ca/handle/11143/1435.

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La ductilité et la capacité à dissiper de l'énergie sont deux qualités très importantes pour les éléments structuraux des structures situées dans les régions sismiques comme l'est du Canada. Soulignons que Montréal occupe la deuxieme place en ce qui a trait au risque sismique au Canada. De plus, la réduction des coûts de maintenance des infrastructures est un sujet d'intérêt pour les propriétaries alors que ces derniers doivent en tout temps garantir la sécurité des usagers. Or, le béton renforcé avec des fibres synthétiques semble être un matériau qui remplit ces caractéristiques. Pourtant, s

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Plochý, Ondřej. "Vývoj sklobetonů s vysokými mechanickými vlastnostmi." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2018. http://www.nusl.cz/ntk/nusl-371943.

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This master thesis summarizes the current knowledge regarding the design and properties of glass fiber reinforced concrete products. It also deals with the design of a new concrete recipe for Dako spol. s.r.o company. There is verified effect of changes in input materials in real conditions the company to increase tensile bending strength above 20 MPa.In particular, verification of the use of building chemistry like superplasticizing additives, polymer-cement matrix or a change type or dose of glass fiber.

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Julon, Zambrano Neiser Aldeir, and Quispe Elvis Smith Marcañaupa. "Mejoramiento de la resistencia a compresión y flexión de concreto sostenible a elevadas temperaturas, con adición de cenizas puzolánicas." Bachelor's thesis, Universidad Peruana de Ciencias Aplicadas (UPC), 2021. http://hdl.handle.net/10757/657263.

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El presente artículo de estudio analizó la resistencia al fuego del concreto con adición de cenizas de cascara de arroz (CCA) y bagazo de caña de azúcar (CBCA). Se adoptó un método experimental como diseño de investigación, que produjo setenta y dos probetas cilíndricas (72) y cincuenta y cuatro vigas (54), para ensayos a compresión y flexión respectivamente. Se utilizaron cenizas en porcentajes de 5% y 10% y además una combinación binaria de 5% y 5% de ambas cenizas como reemplazo parcial de cemento. Las muestras fueron ensayadas luego de 28 días de curado a temperaturas de 24 °C (ambiente),

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