The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays

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dc.contributor.advisorBeushausen, Hans-Dieteren_ZA
dc.contributor.advisorMoyo, Pilateen_ZA
dc.contributor.authorChibulu, Chizyaen_ZA
dc.date.accessioned2016-07-20T11:58:48Z
dc.date.available2016-07-20T11:58:48Z
dc.date.issued2016en_ZA
dc.description.abstractThe concrete repair industry is driven by deterioration of, damage to, and defects in concrete structures. The impact of deterioration or damage is a reduction in the service life of the concrete structure. One of the common methods used to repair and rehabilitate damaged concrete structures is the bonded overlay technique. However, bonded overlays are prone to restrained shrinkage cracking which impairs their performance. The mechanism leading to restrained shrinkage cracking of bonded concrete overlays is complex and depends on material properties, such as shrinkage, tensile strength, elastic modulus, and tensile relaxation. In order to reduce the risk of cracking in bonded concrete overlays, one or a combination of the following is required: lower shrinkage strains, higher tensile strength, lower elastic modulus, and increased stress relaxation. The development of these material properties depends on the degree of hydration of the binder material. Fly ash (FA) and slag (GGBS) are known to influence the hydration reaction when added to the binder material. This change in hydration reactions affects the development of the mechanical properties of the concrete, which ultimately affects the outcome of restrained shrinkage. An increase in age at cracking with the use of fly ash and slag in bonded concrete overlays was hypothesised. The research aimed at investigating the influence of fly ash and slag on the performance of bonded concrete overlays with regards to restrained shrinkage cracking. The research also aimed at using the influence of fly ash and slag on the specific material properties governing restrained shrinkage to analyse and predict the performance of the overlay materialsen_ZA
dc.identifier.apacitationChibulu, C. (2016). <i>The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Concrete Materials and Structural Integrity Research Unit (CoMSIRU). Retrieved from http://hdl.handle.net/11427/20521en_ZA
dc.identifier.chicagocitationChibulu, Chizya. <i>"The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Concrete Materials and Structural Integrity Research Unit (CoMSIRU), 2016. http://hdl.handle.net/11427/20521en_ZA
dc.identifier.citationChibulu, C. 2016. The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Chibulu, Chizya AB - The concrete repair industry is driven by deterioration of, damage to, and defects in concrete structures. The impact of deterioration or damage is a reduction in the service life of the concrete structure. One of the common methods used to repair and rehabilitate damaged concrete structures is the bonded overlay technique. However, bonded overlays are prone to restrained shrinkage cracking which impairs their performance. The mechanism leading to restrained shrinkage cracking of bonded concrete overlays is complex and depends on material properties, such as shrinkage, tensile strength, elastic modulus, and tensile relaxation. In order to reduce the risk of cracking in bonded concrete overlays, one or a combination of the following is required: lower shrinkage strains, higher tensile strength, lower elastic modulus, and increased stress relaxation. The development of these material properties depends on the degree of hydration of the binder material. Fly ash (FA) and slag (GGBS) are known to influence the hydration reaction when added to the binder material. This change in hydration reactions affects the development of the mechanical properties of the concrete, which ultimately affects the outcome of restrained shrinkage. An increase in age at cracking with the use of fly ash and slag in bonded concrete overlays was hypothesised. The research aimed at investigating the influence of fly ash and slag on the performance of bonded concrete overlays with regards to restrained shrinkage cracking. The research also aimed at using the influence of fly ash and slag on the specific material properties governing restrained shrinkage to analyse and predict the performance of the overlay materials DA - 2016 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2016 T1 - The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays TI - The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays UR - http://hdl.handle.net/11427/20521 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/20521
dc.identifier.vancouvercitationChibulu C. The influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlays. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Concrete Materials and Structural Integrity Research Unit (CoMSIRU), 2016 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/20521en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentConcrete Materials and Structural Integrity Research Unit (CoMSIRU)en_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherCivil Engineeringen_ZA
dc.titleThe influence of fly ash and ground granulated blastfurnace slag on restrained shrinkage cracking of bonded overlaysen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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