Desalination of historical masonry using hydrophilic mineral wool boards

Michálek, P.; Tydlitát, Vratislav; Jerman, Miloš; erný,

doi:10.2495/cmem070391

Cited by 4 publications

(7 citation statements)

References 2 publications

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“…The same behaviour was described by Michálek et al [14] for a different type of sandstone having total open porosity 31.2 %. In that study, sandstone performance was compared with brick and autoclaved aerated concrete.…”

Section: Fig 5 Progress Of Drying Processsupporting

confidence: 83%

Properties of Hydrophilic Mineral Wool for Desalination of Historical Masonry

Antepara¹,

Pavlík²,

Žumár³

et al. 2016

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Hydrophilic mineral wool (HMW) is considered as a possible alternative to the commonly used cellulose in desalination of historical masonry. HMW also allows water and salt solutions transport along the hydrophilic fibres, which is the necessary condition for its possible application for desalination measures, but contrary to cellulose it is inorganic material, which reduces maintenance of the poultice. On this account, the hygric transport and storage properties of newly developed HMW is determined in the paper. In order to get detailed information on HMW performance, its thermal properties are measured as well. For its basic characterization, bulk density, matrix density, saturation moisture and salt content, and apparent total open porosity are accessed. The results are in good agreement with those published in literature for similar types of HMW. The process of drying of three different types of sandstone, as typical materials frequently used in historical buildings, using HMW board is monitored to analyse the practical applicability of the proposed desalination treatment. The obtained results show that HMW slows the drying process. However, the final level of drying is the same as without the HMW, which indicates the possible applicability of studied HMW for desalination purposes.

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Section: Fig 5 Progress Of Drying Processsupporting

confidence: 83%

Properties of Hydrophilic Mineral Wool for Desalination of Historical Masonry

Antepara¹,

Pavlík²,

Žumár³

et al. 2016

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show abstract

“…The second strategy is based on assumption that reducing of water transport in a porous media implies that the salt transport will be reduced as well. In the past few decades, an increased use of injection of chemical damp-proof courses in masonry walls was detected due to high cost of several other treatments, such as replacement of poulticing [46]. Among the most frequently used chemicals, liquid water based silane/siloxane products were showed to spread homogeneously and reduce water uptake the most efficiently [47].…”

Section: Passive Techniquesmentioning

confidence: 99%

“…Based on previous observations [60], the electrokinetic method seems to work ion-selectively. The best results have been achieved related to alkaline and chloride ions while the removal rate depends on the associated cation [46]. On the other hand, only the minor part of magnesium part can be extracted.…”

Section: Active Desalination Techniquesmentioning

confidence: 99%

“…Therefore, a development of new conservation treatments is required that can preferably be applied for both preventing salt damage development and promoting effective desalination. Hydrophilic mineral wool is often mentioned in that respect as an alternative to commonly used cellulose [46]. Contrary to cellulose, mineral wool is an inorganic material that does not support the mold growth affecting negatively the maintenance of the poultice.…”

Section: Active Desalination Techniquesmentioning

confidence: 99%

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Salt Damage and Rising Damp Treatment in Building Structures

Delgado

Guimarães

Freitas

et al. 2016

Advances in Materials Science and Engineering

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Salt damage can affect the service life of numerous building structures, both historical and contemporary, in a significant way. In this review, various damage mechanisms to porous building materials induced by salt action are analyzed. The importance of pretreatment investigations is discussed as well; in combination with the knowledge of salt and moisture transport mechanisms they can give useful indications regarding treatment options. The methods of salt damage treatment are assessed then, including both passive techniques based on environmental control, reduction of water transport, or conversion to less soluble salts and active procedures resulting in the removal of salts from deterioration zones. It is concluded that cellulose can still be considered as the favorite material presently used in desalination poultices but hydrophilic mineral wool can serve as its prospective alternative in future applications. Another important cause of building pathologies is the rising damp and, in this phenomenon, it is particularly severe considering the presence of salts in water. The treatment of rising damp in historic building walls is a very complex procedure and at Laboratory of Building Physics (LFC-FEUP) a wall base hygroregulated ventilation system was developed and patented.

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“…Mineral wool is widely used as a thermal insulation material on buildings in the Central Europe. It is due to its very good insulating properties, such as high vapour permeability that avoids condensation problems, excellent thermal properties and easy application on the building structures [1]. Moreover, this material is gentle on environment without any known effects on human health.…”

Section: Introduction *mentioning

confidence: 99%

Moisture dependent thermal properties of hydrophilic mineral wool: application of the effective media theory

Antepara¹

2015

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Thermal properties of mineral wool based materials appear to be of high importance because the most widespread practice is using them as thermal insulation boards. Their thermal conductivity is easily found, i.e. data sheets from producers, often including specific heat capacity, but usually only characteristic values for dry state. Exposure to outside climate or any other environment containing moisture can negatively affect the thermal insulation properties of the mineral wool. This is why the presence of water inside the mineral wool is undesirable for the majority of applications; so, they are often provided with hydrophobic substances, whereas hydrophilic additives are seldom used. However, the later combination has good potential for some applications (i.e. desalination of masonries and green roofs). In those cases, mineral wool will work with a certain moisture content, which will change the thermal properties it had in the dry state. On this account, moisture dependent thermal properties (thermal conductivity and specific heat capacity) of hydrophilic mineral wool (HMW) are studied in a wide range of moisture content using impulse technique. The experimentally determined thermal conductivity data are analysed using a several homogenization formulas based on the effective media theory. In terms of homogenization, a porous material is considered as a mixture of two or three phases: solid (basalt fibres) and gaseous (air) phase for the dry state, adding the liquid phase (water) when moisten. The homogenization techniques are first applied to calculate the thermal conductivity of the solid matrix. Then, it dependence on moisture content is evaluated using some mixing formulas. To verify the obtained results, Wiener's and Hashin-Shtrikman's bounds are used. As a summary, the application of homogenization techniques can successfully estimate measured data for a highly inhomogeneous fibrous material (i.e. mineral wool), even consuming less time.

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Desalination of historical masonry using hydrophilic mineral wool boards

Cited by 4 publications

References 2 publications

Properties of Hydrophilic Mineral Wool for Desalination of Historical Masonry

Properties of Hydrophilic Mineral Wool for Desalination of Historical Masonry

Salt Damage and Rising Damp Treatment in Building Structures

Moisture dependent thermal properties of hydrophilic mineral wool: application of the effective media theory

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