Fatigue and fracture of cement mortars containing fly ash

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dc.contributor.advisorTait, Ren_ZA
dc.contributor.advisorDe Kock, M Oen_ZA
dc.contributor.authorTaylor, Peter Clementen_ZA
dc.date.accessioned2016-09-06T14:42:01Z
dc.date.available2016-09-06T14:42:01Z
dc.date.issued1995en_ZA
dc.description.abstractThe aim of the work described in this thesis was two-fold; to investigate the effects of fly ash on the fatigue resistance of cement mortars when included as a partial cement replacement, and to seek to improve the understanding of cyclic fatigue crack growth mechanisms in cementitious materials. Mortar mixes were prepared with similar compressive cube strengths using a range of three fly ash contents from 0% to 25% (by mass of cement). Samples prepared using these mixes were tested in a double torsion facility under cyclic loading, and the rates of crack growth measured and recorded. These crack velocities were plotted against the applied stress intensities on log-log scales in so called V-K diagrams. An advantage of using the double torsion system was that the applied stress intensity was constant for constant load conditions and changing crack length, unlike many other configurations. However, the amount of scatter inherent in the system, and in testing cementitious materials, is large. This has meant that comparison between sets of data has had to be carried out on the basis of comparing the positions of clouds of data, rather than comparing the slopes of best fit lines. Another advantage of the OT system is that some of the parameters pertaining to the test can be changed whilst the test is in progress. This means that the effects of changing, say, load amplitude or cyclic frequency can be observed on the same specimen. Parameters that were considered in the test matrix. included the following: fly ash content, sample age, cyclic frequency and amplitude, maximum applied stress intensity, relative humidity and temperature of the environment, drying preparation of the sample and the type of fluid in which the samples were tested. The relative effects of all of these variables were compared in a series of V-K plots and trends were noted.en_ZA
dc.identifier.apacitationTaylor, P. C. (1995). <i>Fatigue and fracture of cement mortars containing fly ash</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering. Retrieved from http://hdl.handle.net/11427/21688en_ZA
dc.identifier.chicagocitationTaylor, Peter Clement. <i>"Fatigue and fracture of cement mortars containing fly ash."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1995. http://hdl.handle.net/11427/21688en_ZA
dc.identifier.citationTaylor, P. 1995. Fatigue and fracture of cement mortars containing fly ash. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Taylor, Peter Clement AB - The aim of the work described in this thesis was two-fold; to investigate the effects of fly ash on the fatigue resistance of cement mortars when included as a partial cement replacement, and to seek to improve the understanding of cyclic fatigue crack growth mechanisms in cementitious materials. Mortar mixes were prepared with similar compressive cube strengths using a range of three fly ash contents from 0% to 25% (by mass of cement). Samples prepared using these mixes were tested in a double torsion facility under cyclic loading, and the rates of crack growth measured and recorded. These crack velocities were plotted against the applied stress intensities on log-log scales in so called V-K diagrams. An advantage of using the double torsion system was that the applied stress intensity was constant for constant load conditions and changing crack length, unlike many other configurations. However, the amount of scatter inherent in the system, and in testing cementitious materials, is large. This has meant that comparison between sets of data has had to be carried out on the basis of comparing the positions of clouds of data, rather than comparing the slopes of best fit lines. Another advantage of the OT system is that some of the parameters pertaining to the test can be changed whilst the test is in progress. This means that the effects of changing, say, load amplitude or cyclic frequency can be observed on the same specimen. Parameters that were considered in the test matrix. included the following: fly ash content, sample age, cyclic frequency and amplitude, maximum applied stress intensity, relative humidity and temperature of the environment, drying preparation of the sample and the type of fluid in which the samples were tested. The relative effects of all of these variables were compared in a series of V-K plots and trends were noted. DA - 1995 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1995 T1 - Fatigue and fracture of cement mortars containing fly ash TI - Fatigue and fracture of cement mortars containing fly ash UR - http://hdl.handle.net/11427/21688 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/21688
dc.identifier.vancouvercitationTaylor PC. Fatigue and fracture of cement mortars containing fly ash. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 1995 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/21688en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Civil Engineeringen_ZA
dc.publisher.facultyFaculty of Engineering and the Built Environment
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherCivil Engineeringen_ZA
dc.titleFatigue and fracture of cement mortars containing fly ashen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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