Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Interfacial Transition Zone (ITZ) Analysis in Hydraulic Lime Restoration Mortars for Grouting of Historical Masonries
In this study, binder-aggregate interfacial transition zone (ITZ) of some hydraulic lime based mortars is analyzed in order to determine the way in which their morphological and compositional structure is related to strength and durability development. To achieve this determination, using a lime mortar as a starting point, several hydraulic mixes were prepared with metakaolin (MK), sepiolite, and Portland cement additions. Lime mortar ITZ was compared with hydraulic mortars, obtained both from a natural hydraulic lime (NHL) and from the mentioned artificial hydraulic lime mixes. Scanning electron microscopy (SEM) and energy dispersion X-ray analysis (EDX) microanalysis techniques in combination with stress tests were carried out. Results showed the most radical behavior with the MK addition to mortar rather than with the Portland cement addition, even at 1:1 ratio. Continual transition zones together with higher strengths correspond to mortars with smaller aluminate phases and hydrogarnets. Thus, a small contribution of the latter to binder-aggregate bonding and mechanical resistance can be considered. Finally, sepiolite addition does not affect mechanical behavior under these work conditions.
Interfacial Transition Zone (ITZ) Analysis in Hydraulic Lime Restoration Mortars for Grouting of Historical Masonries
In this study, binder-aggregate interfacial transition zone (ITZ) of some hydraulic lime based mortars is analyzed in order to determine the way in which their morphological and compositional structure is related to strength and durability development. To achieve this determination, using a lime mortar as a starting point, several hydraulic mixes were prepared with metakaolin (MK), sepiolite, and Portland cement additions. Lime mortar ITZ was compared with hydraulic mortars, obtained both from a natural hydraulic lime (NHL) and from the mentioned artificial hydraulic lime mixes. Scanning electron microscopy (SEM) and energy dispersion X-ray analysis (EDX) microanalysis techniques in combination with stress tests were carried out. Results showed the most radical behavior with the MK addition to mortar rather than with the Portland cement addition, even at 1:1 ratio. Continual transition zones together with higher strengths correspond to mortars with smaller aluminate phases and hydrogarnets. Thus, a small contribution of the latter to binder-aggregate bonding and mechanical resistance can be considered. Finally, sepiolite addition does not affect mechanical behavior under these work conditions.
Interfacial Transition Zone (ITZ) Analysis in Hydraulic Lime Restoration Mortars for Grouting of Historical Masonries
Sepulcre Aguilar, Alberto (Autor:in) / Hernández-Olivares, Francisco (Autor:in)
International Journal of Architectural Heritage ; 6 ; 396-414
01.07.2012
19 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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