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Dissertations / Theses on the topic 'Workability and strength'

Author: Grafiati

Published: 3 June 2025

Last updated: 31 July 2025

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1

Ahmed, El-Mahadi. "Rheological properties, loss of workability and strength development of high-strength concrete." Thesis, University College London (University of London), 2002. http://discovery.ucl.ac.uk/1317867/.

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The successful production of high-strength concrete which meets the desired strength and durability is dependent on optimising its rheological (or flow) properties and reducing its loss of workability during the transportation, placing and compaction stages. The research presented in this thesis aimed to: 1. Determine whether mix stability and compactability can be adequately described by the two Bingham parameters of yield value and plastic viscosity. 2. Reduce the uncertainties in material selection with regards to the performance of superplasticizers and cement replacement materials. 3. Exa

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2

Soutsos, Marios Nicou. "Mix design, workability heat evolution and strength development of high strength concrete." Thesis, University College London (University of London), 1992. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308062.

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A literature survey of the properties and uses of high strength concrete, defined for this study as having a strength in excess of 60 N/tnm2, has shown that of prime need is a systematic, reproducible procedure for attaining high strength concrete. The "Maximum Density Theory", i.e. the requirement that the aggregate occupies as large a relative volume as possible, has been adopted as an approach to optimisation of the mix proportions. However, this does not consider the effect that the aggregate suIface area has on the requirement of excess paste for lubrication. To investigate the combined e

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3

Mahlaba, Jabulani Samuel. "The influence of brine chemistry on the workability, strength development and mineralogy of fly ash pastes." Thesis, University of Pretoria, 2011. http://hdl.handle.net/2263/31034.

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The ever-increasing demand for energy due to industrialization and population growth necessitates the combustion of more coal , which results in enormous fly ash production. The scarcity of pot able water as well as high water consumption during mineral and coal processing leads to inevitable saline brine production. Both saline brines and fly ashes pose an environmental threat, where utilization of fly ashes is negligible. The management of industrial brines is a concern for inland industries because oceanic disposal is uneconomical . It is therefore imperative to develop an innovative w

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4

Halabi, Amer, and Tor Grimlund. "Inverkan av flisig krossballast på betong." Thesis, KTH, Betongbyggnad, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-137182.

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Concrete is one of the world’s most common construction materials and is composed of 70-80 % stone material. Today crushed stone is used as aggregate in concrete in order to replace natural aggregates due to strong environmental reasons. Stone crushing yields flaky material and in this thesis studies are made on the flaky particle shape and how it influence properties of concrete such as workability, rheology and strength. The concrete recipes used in this thesis have fixed values, the only variable is the flakiness of the crushed stone. Flakiness is varied between 0 %, 17 %, 50 %, and 100 % i

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5

Pavlík, Tomáš. "Studium pojivového systému pro žárobetony na bázi kyseliny fosforečné a hlinitanového cementu." Master's thesis, Vysoké učení technické v Brně. Fakulta chemická, 2020. http://www.nusl.cz/ntk/nusl-414129.

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This thesis deals with refractory concrete binding system based on aluminous cement and phosphoric acid. The prepared refractory concretes were fired at 1 000 °C. Various effects on compressive strength of refractory concrete were studied. The influence of aluminous cement content and phosphoric acid content, the influence of various admixtures, the influence of plasticizers and the influence of time and method of sample storage were studied. Simultaneous thermogravimetry and differential thermal analysis of the basic unfired sample were performed. Finally, selected refractory concretes were f

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6

Rahman, Abdulsattar, and Hassan Ali. "Återvunnen betong som ballast i ny betong : experimentell studie om partikelgradering, arbetbarhet och tryckhållfasthet." Thesis, Högskolan i Borås, Akademin för textil, teknik och ekonomi, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:hb:diva-15446.

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Betong är idag och har länge varit det allra vanligaste byggnadsmaterial i Sverige. Det är ett robust och mångsidigt byggnadsmaterial med flera fördelar. Detta arbete är en experimentell studie av betongavfall från Hedareds sand & betong för betongprogrammet RE: Concrete och Högskolan i Borås. Betongavfallet krossas till ny ballast och därefter siktas och gjuts till ny betong enligt olika betongrecept. Försöken sker i betonglabbet i Högskolan i Borås för att krossa och tillverka betong. Grundreceptet har tillhandhållits av Hedareds sand & betong. Syftet med arbetet har varit att unders

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7

Padovan, Rafaela Gava. "Influência da pré-molhagem nas propriedades de concretos produzidos com agregado reciclado de concreto." Universidade do Vale do Rio dos Sinos, 2013. http://www.repositorio.jesuita.org.br/handle/UNISINOS/3270.

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Submitted by Maicon Juliano Schmidt (maicons) on 2015-04-09T19:46:05Z No. of bitstreams: 1 Rafaela Gava Padovan.pdf: 7081051 bytes, checksum: 9e1501c4f4ebed520c7882be21164038 (MD5)<br>Made available in DSpace on 2015-04-09T19:46:05Z (GMT). No. of bitstreams: 1 Rafaela Gava Padovan.pdf: 7081051 bytes, checksum: 9e1501c4f4ebed520c7882be21164038 (MD5) Previous issue date: 2013-09-05<br>CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior<br>FINEP - Financiadora de Estudos e Projetos<br>Os agregados reciclados de concreto, de um modo geral, apresentam elevada absorção de água,

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8

Dvořák, Richard. "Studium efektu aplikace celulózových vláken v cementových kompozitech." Master's thesis, Vysoké učení technické v Brně. Fakulta stavební, 2016. http://www.nusl.cz/ntk/nusl-240420.

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This diploma thesis is focused on composition and processing of cellulose fibers and their usage in cementitious composites. It describes key attributes of cellulose fibers, which has to be acquired for effective use in cement composites. There are stated effects of cellulose fibers on concrete properties, such as workability, physical and mechanic attributes and freeze-thaw resistance. In experimental part is designed a mixture with portion of cellulose fibers. There has been performed various tests to define the effect of cellulose fibers. There was designed experiment to determine its alkal

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9

Moraes, Mayara Queiroz. "Contribuição aos estudos da influência da nanossílica nas propriedades mecânicas e na trabalhabilidade de concretos para produção em centrais e para fabricação de pré-moldados." Universidade Federal de Goiás, 2012. http://repositorio.bc.ufg.br/tede/handle/tede/3429.

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Submitted by Erika Demachki (erikademachki@gmail.com) on 2014-10-21T20:50:08Z No. of bitstreams: 2 Dissertação - Mayara Queiroz Moraes - 2012.pdf: 2306074 bytes, checksum: 39f99dfabbb79296b809313dd0730f16 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)<br>Approved for entry into archive by Jaqueline Silva (jtas29@gmail.com) on 2014-10-22T19:07:28Z (GMT) No. of bitstreams: 2 Dissertação - Mayara Queiroz Moraes - 2012.pdf: 2306074 bytes, checksum: 39f99dfabbb79296b809313dd0730f16 (MD5) license_rdf: 23148 bytes, checksum: 9da0b6dfac957114c6a7714714b86306 (MD5)<br>

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10

He, Huan. "Analyse de l'effet d'un adjuvant biosourcé pour élaborer des matériaux cimentaires plus éco-respectueux." Thesis, Strasbourg, 2015. http://www.theses.fr/2015STRAD023.

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Cette thèse s’inscrit dans le cadre du projet SEPOLBE qui a pour ambition d’élaborer des adjuvants respectueux de l’environnement qui doivent se substituer à des produits soumis à autorisation REACH. Elle a pour but de mettre en évidence les propriétés de mortiers enrichis d’un adjuvant fabriqué à partir de produits extracellulaires issus de bactéries selon un protocole original. Ce travail consiste en l’étude des caractéristiques de mortiers bioadjuvantés dans le but de développer l’usage de bétons plus éco‐respectueux en améliorant leurs compositions chimiques et leur durabilité. L’action du

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11

Hsien-sheng, Peng, and 彭獻生. "Effects of Pozzolanic Materials on the Strength and Workability of Recycled Aggregate Concrete." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/88470251244887583544.

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碩士<br>國立中興大學<br>土木工程學系<br>88<br>Due to lower compressive strength and worser workability of recycled aggregate concrete (RAC), it will be limited in the application of construction. Pozzolanic materials such as fly ash and slag could increase compressive strength and workability when it applies on concrete. In this research the recycled aggregate concretes were produced by using a same water to binder ratio and different replacing percentage of fly ash and slag to cement. The engineering properties of recycled aggregate concrete were investigated to determine the optimum replacing amount and r

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12

Wey, Jing Jang, and 魏敬楨. "Influence of Fly Ash and Slag on the Workability and Compressive Strength of High-Performance Concrete." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/47938918855957109795.

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碩士<br>國立中興大學<br>土木工程學系<br>84<br>The main objective of this study is to research the workability and compressive strength of High-performance concrete under different water-cement ratio and various propotion of pozzolan materials（fly ash and slag）replacing cement 550kg/m3 as 100kg/ m3 , 200kg/m3, 300kg/m3 and partial amounts of sand , and to get the optimum replacement for economic benefit . The propotion of pozzolan materials is divided into five categories , such as 100％ , 80％ , 50％ , 20％

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13

Wei, Jing Zhen, and 魏敬楨. "Influence of fly ash and slag on the workability and compressive strength of high-performance concrete." Thesis, 1996. http://ndltd.ncl.edu.tw/handle/56340757797774816619.

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14

Cunha, Mário Jorge Forte Martins. "Durabilidade de geopolímeros monofásicos." Master's thesis, 2013. http://hdl.handle.net/1822/30909.

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Dissertação de mestrado integrado em Engenharia Civil (área de especialização em Perfil de Construções)<br>Tendo em conta que o consumo de cimento Portland aumenta ano após ano, levando ao aumento das emissões de CO2 na produção do mesmo, torna-se necessário encontrar novos materiais ligantes alternativos mais eco-eficientes. Segundo estudos realizados com materiais de ativação alcalina (também designados por geopolímeros), estes possuem maiores resistências do ponto de vista mecânico, têm maior durabilidade e estabilidade, e atingem estes comportamentos com maior rapidez do que os mater

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15

Zulu, Sabelo N. F. "Optimizing the usage of fly ash in concrete mixes." Thesis, 2017. http://hdl.handle.net/10321/2673.

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Improving on our construction practices to promote sustainable development in engineering and to promote eco-friendly living is vital in the fight against global warming and associated problems. This study looked at one of the ways in which engineering can contribute to this fight through promoting the recycling of waste by-products such as fly ash (FA), on a larger scale in the cement and concrete industry, by utilizing the FA to the optimum. In this study concrete mixes of 25 MPa, 35 MPa and 50 MPa with FA partially substituting the cement at 30%, 40%, 50% and 60% were produced and numer

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16

Kannangara, A. M. U. Thathsarani. "The Behaviour of Reactive Powder Geopolymer Concrete at Elevated Temperature." Thesis, 2018. https://vuir.vu.edu.au/37855/.

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Concrete is one of the most widely used materials within the construction industry due to its versatility, durability, superior mechanical properties and excellent resistance to fire. In addition to this, the rapid growth in population and urbanisation has accelerated the demand for high strength concretes. However, high strength concretes suffer a condition called spalling when exposed to elevated temperature levels which is associated with the breaking away or exploding of concrete layers due to the internal stresses. Additionally, concrete is a material having a very high carbon footprint m

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