Influence of mix design parameters on restrained shrinkage cracking in non-structural concrete patch repair mortars

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dc.contributor.advisorBeushausen, Hans-Dieteren_ZA
dc.contributor.advisorAlexander, Mark Gavinen_ZA
dc.contributor.authorArito, Philemonen_ZA
dc.date.accessioned2018-05-03T12:20:46Z
dc.date.available2018-05-03T12:20:46Z
dc.date.issued2018en_ZA
dc.description.abstractThere is a dearth of clear and consistent information on the effects of mix design parameters, and their corresponding interactions, on restrained shrinkage cracking in non-structural concrete patch repair mortars (PRMs). This dearth of information makes the design and development of PRMs with improved resistance to cracking challenging. The problem is further compounded by the fact that the existing code of practice for concrete repair - the EN 1504-3:2005 - specifies many material properties such as chloride ion content, compressive strength, bond strength, skid resistance and capillary absorption. Some of these material properties, such as skid resistance and chloride ion content, are not relevant to cracking. Also, empirical analytical models for predicting stresses and the age at cracking in PRMs need improvement to accommodate recent developments in materials such as admixtures and additives. Accurate prediction models help design engineers make informed choices during the selection of PRMs. The principal objective of this study was to generate new knowledge that would inform the design of non-structural PRMs and the development of performance requirements for these PRMs. This was accomplished through an investigation into the influence of multiple mix design parameters and crack-determining material properties on restrained shrinkage cracking, involving a critical review of literature and a comprehensive laboratory experimental programme. The experimental work was organised into two phases. Phase one entailed an investigation into the effect of water content, binder content, binder type, curing type, shrinkage reducing admixture (SRA) dosage, polymer type and polymer content on cracking. A 2⁵ full factorial experiment approach with three replicates was used in this phase. 32 mixes were studied. The sensitivity of cracking to the listed mix design parameters was determined with respect to the age at cracking in ring specimens made in accordance with ASTM C 1581. A trend analysis of the investigated mix design parameters and cracking was also done.en_ZA
dc.identifier.apacitationArito, P. (2018). <i>Influence of mix design parameters on restrained shrinkage cracking in non-structural concrete patch repair mortars</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/11427/27879en_ZA
dc.identifier.chicagocitationArito, Philemon. <i>"Influence of mix design parameters on restrained shrinkage cracking in non-structural concrete patch repair mortars."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Concrete Materials and Structural Integrity Research Unit (CoMSIRU), 2018. http://hdl.handle.net/11427/27879en_ZA
dc.identifier.citationArito, P. 2018. Influence of mix design parameters on restrained shrinkage cracking in non-structural concrete patch repair mortars. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Arito, Philemon AB - There is a dearth of clear and consistent information on the effects of mix design parameters, and their corresponding interactions, on restrained shrinkage cracking in non-structural concrete patch repair mortars (PRMs). This dearth of information makes the design and development of PRMs with improved resistance to cracking challenging. The problem is further compounded by the fact that the existing code of practice for concrete repair - the EN 1504-3:2005 - specifies many material properties such as chloride ion content, compressive strength, bond strength, skid resistance and capillary absorption. Some of these material properties, such as skid resistance and chloride ion content, are not relevant to cracking. Also, empirical analytical models for predicting stresses and the age at cracking in PRMs need improvement to accommodate recent developments in materials such as admixtures and additives. Accurate prediction models help design engineers make informed choices during the selection of PRMs. The principal objective of this study was to generate new knowledge that would inform the design of non-structural PRMs and the development of performance requirements for these PRMs. This was accomplished through an investigation into the influence of multiple mix design parameters and crack-determining material properties on restrained shrinkage cracking, involving a critical review of literature and a comprehensive laboratory experimental programme. The experimental work was organised into two phases. Phase one entailed an investigation into the effect of water content, binder content, binder type, curing type, shrinkage reducing admixture (SRA) dosage, polymer type and polymer content on cracking. A 2⁵ full factorial experiment approach with three replicates was used in this phase. 32 mixes were studied. The sensitivity of cracking to the listed mix design parameters was determined with respect to the age at cracking in ring specimens made in accordance with ASTM C 1581. A trend analysis of the investigated mix design parameters and cracking was also done. DA - 2018 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2018 T1 - Influence of mix design parameters on restrained shrinkage cracking in non-structural concrete patch repair mortars TI - Influence of mix design parameters on restrained shrinkage cracking in non-structural concrete patch repair mortars UR - http://hdl.handle.net/11427/27879 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/27879
dc.identifier.vancouvercitationArito P. Influence of mix design parameters on restrained shrinkage cracking in non-structural concrete patch repair mortars. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Concrete Materials and Structural Integrity Research Unit (CoMSIRU), 2018 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/27879en_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.otherConcrete Researchen_ZA
dc.titleInfluence of mix design parameters on restrained shrinkage cracking in non-structural concrete patch repair mortarsen_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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