Modeling and Design of Modern Cocciopesto Mortars

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F15%3A00240810" target="_blank" >RIV/68407700:21110/15:00240810 - isvavai.cz</a>

Výsledek na webu

<a href="http://mech.fsv.cvut.cz/~nezerka/theses.html" target="_blank" >http://mech.fsv.cvut.cz/~nezerka/theses.html</a>

DOI - Digital Object Identifier

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Jazyk výsledku

angličtina

Název v původním jazyce

Modeling and Design of Modern Cocciopesto Mortars

Popis výsledku v původním jazyce

The major goal of the presented research was to study the behavior of lime-based mortars containing crushed bricks, also known as cocciopesto, on multiple scales, develop a computational model for an optimization of the mortar composition, and demonstrate the superior structural performance of the designed mortar through a full-scale masonry testing. The enhanced strength, durability and increased resistance of the cocciopesto mortars to seismic loading had been traditionally attributed to the formation of hydration products at the interface between the crushed brick fragments and the surrounding lime matrix. However, according to the outcomes analyses to study the chemical composition and microstructure of lime-based pastes and mortars, combined with grid nanoindentation results and outputs of micromechanical modeling, it was concluded that the thin coating of hydration products does not have such a positive influence on the effective mortar properties. The crushed bricks are rather seen as a very suitable filler for their compliance resulting in a mitigation of shrinkage cracking. The porous microstructure of brick fragments and their stiffness similar to that of the lime-based matrix ensures a good adhesion between the aggregates and the matrix. Moreover, their water retention resulting from their high porosity, promotes the pozzolanic reaction. Therefore, it seems reasonable to combine brick fragments with pozzolans of a higher reactivity, such as metakaolin. The findings were used for the development of a modern cocciopesto mortar to be used for repairs of cultural heritage. The enhanced strength of the developed mortar was reflected in a significantly increased load-bearing capacity of masonry piers loaded by the combination of compression and bending, which can explain the extraordinary resistance and durability of ancient masonry structures with cocciopesto.

Název v anglickém jazyce

Modeling and Design of Modern Cocciopesto Mortars

Popis výsledku anglicky

The major goal of the presented research was to study the behavior of lime-based mortars containing crushed bricks, also known as cocciopesto, on multiple scales, develop a computational model for an optimization of the mortar composition, and demonstrate the superior structural performance of the designed mortar through a full-scale masonry testing. The enhanced strength, durability and increased resistance of the cocciopesto mortars to seismic loading had been traditionally attributed to the formation of hydration products at the interface between the crushed brick fragments and the surrounding lime matrix. However, according to the outcomes analyses to study the chemical composition and microstructure of lime-based pastes and mortars, combined with grid nanoindentation results and outputs of micromechanical modeling, it was concluded that the thin coating of hydration products does not have such a positive influence on the effective mortar properties. The crushed bricks are rather seen as a very suitable filler for their compliance resulting in a mitigation of shrinkage cracking. The porous microstructure of brick fragments and their stiffness similar to that of the lime-based matrix ensures a good adhesion between the aggregates and the matrix. Moreover, their water retention resulting from their high porosity, promotes the pozzolanic reaction. Therefore, it seems reasonable to combine brick fragments with pozzolans of a higher reactivity, such as metakaolin. The findings were used for the development of a modern cocciopesto mortar to be used for repairs of cultural heritage. The enhanced strength of the developed mortar was reflected in a significantly increased load-bearing capacity of masonry piers loaded by the combination of compression and bending, which can explain the extraordinary resistance and durability of ancient masonry structures with cocciopesto.

Druh

O - Ostatní výsledky

CEP obor

JI - Kompositní materiály

OECD FORD obor

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Projekt

<a href="/cs/project/DF11P01OVV008" target="_blank" >DF11P01OVV008: Vysokohodnotné a kompatibilní vápenné malty pro extrémní aplikaci při restaurování, opravách a preventivní údržbě architektonického dědictví</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2015

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů