Investigating repair mortars containing superabsorbent polymers as a method of internal curing to improve concrete patch repair performance

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dc.contributor.advisorBeushausen, Hans-Dieteren_ZA
dc.contributor.advisorAlexander, Mark Gen_ZA
dc.contributor.authorGillmer, Marcen_ZA
dc.date.accessioned2015-10-30T10:37:58Z
dc.date.available2015-10-30T10:37:58Z
dc.date.issued2012en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractConcrete structures are designed with a specific service life in mind and deteriorate over time due to their exposure to environmental conditions. In order to increase the service life of concrete structures, they can sometimes be rehabilitated and repaired using concrete overlays. However, problems may develop between the new and old concrete due to differential shrinkage between the concrete substrate and overlay. These differential shrinkages typically result in the build - up of tensile stresses within the overlay. If the concrete does not possess sufficient tensile strength, the overlay will crack and or delaminate, which is usually considered failure. To prevent cracking, the quantity of shrinkage that occurs in the overlay needs to be minimised. Literature suggests that the addition of superabsorbent polymers (SAP's) to the concrete overlay can reduce the total shrinkage that occurs. A large amount of research exists pertaining to the use on SAP's in high performance concrete (HPC), while very little research has been done regarding their influence of overlays. This research investigated how the addition of SAP's to overlays containing silica fume (SF) would improve bonded concrete overlay performance. Testing was conducted on overlay samples with a water:binder (W/b) ratio of 0.45 and 0.55 with SAP contents of containing 0%, 0.2%, 0.4% and 0.6% of the total binder content. Samples were subjected to a large number of tests including compressive, tensile and shear bond strength, durability, tensile relaxation, elastic modulus, carbonation, bulk diffusion and free and restrained shrinkage. The results of this research indicate d that the SAP's had a greater influence on samples with a higher w/b ratio. The results also suggested that an increase in SAP content resulted in improved tensile strength, tensile relaxation and durability while also reducing the rate of drying shrinkage at early ages . This indicated that SAP's can be used in mix design to improve bonded concrete overlay performance.en_ZA
dc.identifier.apacitationGillmer, M. (2012). <i>Investigating repair mortars containing superabsorbent polymers as a method of internal curing to improve concrete patch repair performance</i>. (Thesis). University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering. Retrieved from http://hdl.handle.net/11427/14553en_ZA
dc.identifier.chicagocitationGillmer, Marc. <i>"Investigating repair mortars containing superabsorbent polymers as a method of internal curing to improve concrete patch repair performance."</i> Thesis., University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 2012. http://hdl.handle.net/11427/14553en_ZA
dc.identifier.citationGillmer, M. 2012. Investigating repair mortars containing superabsorbent polymers as a method of internal curing to improve concrete patch repair performance. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Gillmer, Marc AB - Concrete structures are designed with a specific service life in mind and deteriorate over time due to their exposure to environmental conditions. In order to increase the service life of concrete structures, they can sometimes be rehabilitated and repaired using concrete overlays. However, problems may develop between the new and old concrete due to differential shrinkage between the concrete substrate and overlay. These differential shrinkages typically result in the build - up of tensile stresses within the overlay. If the concrete does not possess sufficient tensile strength, the overlay will crack and or delaminate, which is usually considered failure. To prevent cracking, the quantity of shrinkage that occurs in the overlay needs to be minimised. Literature suggests that the addition of superabsorbent polymers (SAP's) to the concrete overlay can reduce the total shrinkage that occurs. A large amount of research exists pertaining to the use on SAP's in high performance concrete (HPC), while very little research has been done regarding their influence of overlays. This research investigated how the addition of SAP's to overlays containing silica fume (SF) would improve bonded concrete overlay performance. Testing was conducted on overlay samples with a water:binder (W/b) ratio of 0.45 and 0.55 with SAP contents of containing 0%, 0.2%, 0.4% and 0.6% of the total binder content. Samples were subjected to a large number of tests including compressive, tensile and shear bond strength, durability, tensile relaxation, elastic modulus, carbonation, bulk diffusion and free and restrained shrinkage. The results of this research indicate d that the SAP's had a greater influence on samples with a higher w/b ratio. The results also suggested that an increase in SAP content resulted in improved tensile strength, tensile relaxation and durability while also reducing the rate of drying shrinkage at early ages . This indicated that SAP's can be used in mix design to improve bonded concrete overlay performance. DA - 2012 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2012 T1 - Investigating repair mortars containing superabsorbent polymers as a method of internal curing to improve concrete patch repair performance TI - Investigating repair mortars containing superabsorbent polymers as a method of internal curing to improve concrete patch repair performance UR - http://hdl.handle.net/11427/14553 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/14553
dc.identifier.vancouvercitationGillmer M. Investigating repair mortars containing superabsorbent polymers as a method of internal curing to improve concrete patch repair performance. [Thesis]. University of Cape Town ,Faculty of Engineering & the Built Environment ,Department of Civil Engineering, 2012 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/14553en_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.titleInvestigating repair mortars containing superabsorbent polymers as a method of internal curing to improve concrete patch repair performanceen_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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