| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Lubelli, Barbara
Delft University of Technology
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (12/12 displayed)
- 2024On the necessity of new hydrophobic treatment after repointing of water repellent masonrycitations
- 2024Capsule controlled release of crystallisation inhibitors in mortarscitations
- 2024Encapsulated crystallisation inhibitor as a long-term solution to mitigate salt damage in hydraulic mortarscitations
- 2023Tunable chitosan-alginate capsules for a controlled release of crystallisation inhibitors in mortarscitations
- 2023Experimental Study on Properties of Hydraulic Mortars with Mixed in Crystallisation Inhibitors
- 2023Leaching behaviour of a crystallisation inhibitor in mortarscitations
- 2023A study on leaching of crystallisation inhibitor in mortars
- 2023Factors favouring vegetation in quay masonry walls: A pilot field study
- 2022Effect of a mixed-in crystallization inhibitor on the properties of hydraulic mortarscitations
- 2021Effect Of Alkali Ferrocyanides On Crystallisation Of Sodium Chloride
- 2019Characterization and compatibility assessment of commercial stone repair mortars
- 2016Effect of solvent on nanolime transport within limestonecitations
Places of action
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article
On the necessity of new hydrophobic treatment after repointing of water repellent masonry
Abstract
<p>The impregnation of the exterior surface of a masonry wall with a water repellent is a common intervention in (historic) building renovation and maintenance. Such treatments, whilst degrading at the surface with time under influence of ultra violet light, remain effective below the surface several decades after their application. During renovation works of masonry previously treated with a water repellent, the question arises whether it is necessary to repeat the hydrophobic treatment of the entire masonry after repointing. Opposing opinions exist with this regard, but no research clearly supporting one or the other. This research investigates for the first time the effect of hydrophobic treatment when applied on previously treated and repointed masonry walls. Small masonry walls were subjected to rain periods in the laboratory and their water uptake and drying behaviour were studied. Moreover, this laboratory research was followed by 30 months of outdoor exposition of the masonry specimens. The following cases were considered: (1) wall treated with water repellent, (2) wall treated with water repellent, followed by repointing but without new water repellent treatment, (3) wall treated with water repellent, followed by repointing and retreatment. This was done for three different types of pointing mortar: ordinary Portland cement and natural hydraulic lime with standard sand, and natural hydraulic lime with sand with one grain size. The results show that, after prolonged rain periods, the water uptake by repointed but not retreated masonry is comparable to that of untreated, non-hydrophobic masonry, whereas drying is considerably slower. This leads to a high saturation degree in repointed but not retreated masonry, which, in turn, increases the risk of damage to the masonry by e.g. frost. Therefore, retreating repointed hydrophobic masonry should definitively be considered.</p>