Mechanical interaction between historical brick and repair mortar: experimental and numerical tests

Bocca, Pietro Giovanni; Grazzini, Alessandro; Masera, Davide; Alberto, Andrea; Valente, Silvio

doi:10.1088/1742-6596/305/1/012126

Cited by 8 publications

(9 citation statements)

References 8 publications

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“…The results of compressive static tests are shown in Figure 19. A numerical simulation based on the cohesive crack model was us```ed to follow the experimental data, in order to describe the evolutionary phenomenon of de-bonding as a function of a small number of parameters [13][14][15]. The composite specimen stone-mortar displayed four stress singularity points: two notch tips at the specimen's top, and two at the specimen's bottom.…”

Section: Composite Stone-repair Mortar Specimensmentioning

confidence: 99%

Experimental Fatigue Test for Pre-Qualification of Repair Mortars Applied to Historical Masonry

Grazzini¹

2018

Advanced Engineering Testing

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Restoration work on historical masonry buildings requires new repair materials capable of providing adequate durability over time. The interface between strengthening mortar and historical masonry can be the site of various stresses due to mechanical and thermohygrometric actions, also causing delamination actions. At the Non-Destructive Testing Laboratory of the Politecnico di Torino, an experimental methodology has been developed through static, freezing-thawing and cyclic tests on mixed mortar-bricks specimens. The aim of the laboratory tests was to select a durable and compatible repair mortar before the application. Fatigue tests simulated all main stresses that can be generated at the interface between repair mortar and original masonry, both mechanical and thermo-hygrometric aspects. The experimental results were interpreted by evaluating the variation of deformation parameters over time during the tests. From a range of four strengthening mortars, the experimental procedure was able to select the one with the greatest guarantees of durability and compatibility. A similar experimental procedure has also been developed to test the durability of dehumidified mortars suitable for the recovery of historical plasters subjected by rising dump effects. The same selected mortars have been used successfully at prestigious restoration sites, demonstrating their validity over time.

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Section: Composite Stone-repair Mortar Specimensmentioning

confidence: 99%

Experimental Fatigue Test for Pre-Qualification of Repair Mortars Applied to Historical Masonry

Grazzini¹

2018

Advanced Engineering Testing

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“…Outside the FPZ the material had a linear-elastic behavior. The fracture process starts symmetrically, but loses this property afterwards [10][11][12] because of the propagation of the round-off errors. In this case the numerical simulation was controlled according a uniform downward velocity to the upper edge on the rock.…”

Section: Numerical Simulationmentioning

confidence: 99%

Detachment of Plasters in Masonry Buildings: Analysis by Acoustic Emission and Numerical Simulation

Grazzini

Lacidogna

Valente

et al. 2018

The 18th International Conference on Experimental Mechanics

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An innovative laboratory procedure is described for testing the mechanical adhesion of new dehumidified mortars applied in the restoration works. A specific adherence test was carried out on composite specimens made by stone block and repair mortar. During the laboratory test the acoustic emission (AE) technique was employed, in order to estimate the amount of energy released from fracture propagation in the adherence surface between mortar and stone. A numerical simulation follows the experimental data. The evolution of detachment process of mortar in a coupled stone brick–mortar system was analysed by AE signals, which can improve the numerical model and predict the failure mode in the adhesion surface of repair plaster.

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“…This means they not only region specific but also time specific characteristics (Bocca, et al, 2011). The consequence of restrained deformation normal to the joint flank can be flank failure.…”

Section: Causes Of Cracksmentioning

confidence: 99%

Engineering Models of Masonry by Joint Repairing Techniques

Kaptan¹

2016

APJES

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When repointing historic masonry, it is the quality of the bond between mortar and stones that decides on the lifecycle of the structure. Once the composite system or the mortar start cracking, moisture can penetrate into the masonry and destroy the system. What mortar to use for what kind of masonry is normally an empirical decision. But in how far the mortar eventually selected is really suited for the purpose in question will not turn out until several years later. It is with this knowledge in mind that a simple engineering model has been developed, which is easy to use and which is to permit the likelihood of cracks to be assessed quantitatively. The model is based on calculations made for stresses occurring on the surface of the masonry and only requires a few material parameters. A combined, complex research model is being developed, which is to provide for exact structural analysis. For this model, the temperature and moisture transport is calculated with the aid of an FDM program. The temperature and moisture fields thus determined are then transferred to an FEM program which uses the material models of Rots (1997), Lourenço (1996) and Van Zijl (2000) for stress and deformation calculation.

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Mechanical interaction between historical brick and repair mortar: experimental and numerical tests

Cited by 8 publications

References 8 publications

Experimental Fatigue Test for Pre-Qualification of Repair Mortars Applied to Historical Masonry

Experimental Fatigue Test for Pre-Qualification of Repair Mortars Applied to Historical Masonry

Detachment of Plasters in Masonry Buildings: Analysis by Acoustic Emission and Numerical Simulation

Engineering Models of Masonry by Joint Repairing Techniques

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