A study of the influence of aggregate grading on concrete penetrability

dc.contributor.advisorAlexander, Mark Gavinen_ZA
dc.contributor.advisorBeushausen, Hans-Dieteren_ZA
dc.contributor.authorLoseby, Michael Johnen_ZA
dc.date.accessioned2015-07-03T13:23:56Z
dc.date.available2015-07-03T13:23:56Z
dc.date.issued2014en_ZA
dc.description.abstractConcrete is generally perceived as being an inherently durable material. However, many concrete structures need substantial repairs and maintenance during their service life, with the resultant costs to the economy reaching 3-5 % of GNP in some countries. Durability is therefore key in concrete design and specification. Aggregates constitute between 60 and 80 %, by volume, of typical concretes and have a profound influence on the physical properties of hardened concrete. The aggregate particle size distribution is usually selected so as to achieve a particle packing density that is equal to or near the maximum, which is seen as optimal for strength and durability. However, the influence of aggregate grading on durability apart from that which it has through its effect on particle packing density is not understood. Alternative mechanisms through which grading may effect durability include tortuosity and the porosity of the interfacial transition zone. This research aimed to determine the extent of the influence that aggregate grading has on concrete durability independently of particle packing density and to determine whether fineness modulus (FM) is a suitable and sufficient parameter for the characterisation of aggregate particle size distribution with regard to the performance based specification of concrete where durability is the concern. The coefficient of uniformity (Cu) and the use of gap or continuous grading were two further factors considered.en_ZA
dc.identifier.apacitationLoseby, M. J. (2014). <i>A study of the influence of aggregate grading on concrete penetrability</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering. Retrieved from http://hdl.handle.net/11427/13385en_ZA
dc.identifier.chicagocitationLoseby, Michael John. <i>"A study of the influence of aggregate grading on concrete penetrability."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 2014. http://hdl.handle.net/11427/13385en_ZA
dc.identifier.citationLoseby, M. 2014. A study of the influence of aggregate grading on concrete penetrability. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Loseby, Michael John AB - Concrete is generally perceived as being an inherently durable material. However, many concrete structures need substantial repairs and maintenance during their service life, with the resultant costs to the economy reaching 3-5 % of GNP in some countries. Durability is therefore key in concrete design and specification. Aggregates constitute between 60 and 80 %, by volume, of typical concretes and have a profound influence on the physical properties of hardened concrete. The aggregate particle size distribution is usually selected so as to achieve a particle packing density that is equal to or near the maximum, which is seen as optimal for strength and durability. However, the influence of aggregate grading on durability apart from that which it has through its effect on particle packing density is not understood. Alternative mechanisms through which grading may effect durability include tortuosity and the porosity of the interfacial transition zone. This research aimed to determine the extent of the influence that aggregate grading has on concrete durability independently of particle packing density and to determine whether fineness modulus (FM) is a suitable and sufficient parameter for the characterisation of aggregate particle size distribution with regard to the performance based specification of concrete where durability is the concern. The coefficient of uniformity (Cu) and the use of gap or continuous grading were two further factors considered. DA - 2014 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2014 T1 - A study of the influence of aggregate grading on concrete penetrability TI - A study of the influence of aggregate grading on concrete penetrability UR - http://hdl.handle.net/11427/13385 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/13385
dc.identifier.vancouvercitationLoseby MJ. A study of the influence of aggregate grading on concrete penetrability. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 2014 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/13385en_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.titleA study of the influence of aggregate grading on concrete penetrabilityen_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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