Durability of the hydrophobic treatment on brick and mortar

Soulios, Vasilis; Hansen, Ernst Jan de Place; Peuhkuri, Ruut Hannele; Møller, Eva B.; Ghanbari-Siahkali, Afshan

doi:10.1016/j.buildenv.2021.107994

Cited by 15 publications

(5 citation statements)

References 41 publications

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“…Janus wettability membranes feature asymmetric surface wettability. Determination of WAC is the best method to test the immediate efficiency of the hydrophobization treatment [30,31]. Its popularity is rising.…”

Section: Discussionmentioning

confidence: 99%

Laboratory Assessment of Selected Protective Coatings Applied on Two Sandstone Types

et al. 2022

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The efficiency of three commercial hydrophobic coatings applied on two types of sandstones was subjected to the tests of water absorption by capillarity, water absorption by complete immersion, and frost resistance. Two days of the curing time of coatings on samples were chosen for the laboratory tests. The effects of the used coatings were different (ambiguous). Two coatings proved their effectiveness and thus, relevance of their use, but different coatings were effective on each type of sandstone. The coating F showed the best efficiency for the Hořice sandstone and coating A for the Malé Skalky sandstone. The third testing coating H was ineffective on both types of sandstone. The water absorption tests by capillarity showed a loss of the coating effectiveness over time. By completely immersing the samples in water, all three coatings lost their effectiveness and the hydrophobic effects disappeared. Applied protective coatings helped to preserve the frost resistance of the Hořice sandstone when looking at the uniaxial compressive strength after 25 freeze–thaw cycles, regardless of their fading hydrophobic effect. In addition, a penetration depth test for Hořice sandstone was performed. The impregnation depth reflects the effectiveness of the coatings and confirmed the results obtained by the water absorption tests by capillarity. The findings presented in the article are also useful in practice, as Hořice sandstone will be mined and frequently used in the future as well.

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Section: Discussionmentioning

confidence: 99%

Laboratory Assessment of Selected Protective Coatings Applied on Two Sandstone Types

et al. 2022

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“…The chemistry of treatments has advanced significantly in the century since some of the basic molecules were first synthesised (Charola, 2001). Due to their ease of application and the absence of organic solvents (which have environmental implications), water-based emulsion type products are increasingly popular (Soulios et al, 2021a;UCL and BRE, 2021b;Weeks and Jones, 2021;Witte et al, 1996), but several other types of compound can create a hydrophobic effect (Charola, 2001;Soulios et al, 2020). Improved chemistry has led to at least some products which block the pores to a lesser extent and therefore reduce the vapour diffusion resistance by only a small proportion (D'Ayala et al, 2021;Soulios et al, 2020).…”

Section: General Descriptionmentioning

confidence: 99%

“…A multinational research project including in-situ case studies found that treatments can be expected to provide a hydrophobic effect for significant periods, (van Hees, 1998a;Witte et al, 1996). One laboratory study using accelerated weathering with simulated rain and UV exposure showed that while the beading effect on the exposed surface may deteriorate (probably due to UV degradation of the exposed product (van Hees and Lubelli, 2016)), the treatment below the surface is not impaired and absorption coefficient in fact reduces (Soulios et al, 2021a). On the other hand, other researchers find a gradual decline in performance with limestones under accelerated weathering (Witte et al, 1996).…”

Section: Longevitymentioning

confidence: 99%

An overview of hydrophobic treatments and their application with Internal Wall Insulation

Cambray

Marincioni

Altamirano

2022

Preprint

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Hydrophobic (or water-repellent) treatments have been proposed to mitigate moisture risks associated with Internal Wall Insulation when applied to solid masonry walls. This can reduce risks associated with moisture accumulation within the structure such as mould growth or the deterioration of joist ends and other embedded timber. Where treatments perform well there is a net reduction of moisture content and risk. However, such treatments slow down drying processes, and therefore may result in a net increase in moisture if the treatment is bypassed by e.g. cracks. Some treatments have may lead to damage to external masonry surfaces in some situations. Freeze-thaw and salt crystallisation are the two main causes Hygrothermal simulations may give some indication of risks but techniques to assess the risk of surface damage are either simplistic, impractical outside of the research environment, or both. This paper reviews the state of the art of assessing and predicting the risk of surface damage associated with surface treatments.

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“…There are two common ways of aging of building materials-artificial accelerated aging (hereinafter referred to as 'artificial aging') and natural environmental aging (hereinafter termed as 'natural aging') [7]-with various specific methods and standards. Artificial aging involves simulating a certain temperature [8,9], humidity [10,11], drying-wetting changes [12,13], freeze-thaw cycles [14], ultraviolet radiations [15], and other conditions in the aging test box based on the characteristics of the service life environment of the studied material and the characteristics of the material itself. Natural aging is mostly to place the test specimen in a typical service life environment for a certain period to allow it to accept the aging effect of the environment that is most in line with the actual state to evaluate the material durability [16].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on water absorption and mechanical properties of expanded perlite mortar under accelerated and natural aging conditions

Yuan

Xiong

et al. 2022

Mater. Res. Express

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The objective of this paper is to study the variation in the physical and mechanical properties of expanded perlite mortar with environmental factors and analyze its deterioration mechanism. In this paper, the influence of the heat-rain cyclic and natural aging on the physical and mechanical properties of expanded perlite mortar has been studied. The expanded perlite mortar specimens were subjected to 80 heat-rain cycles (the maximum temperature rises to 70℃, and the spray volume reaches 1 L/(m² min)) and 60-day natural aging tests (the daily average temperature is 23°C, with the maximum temperature reaching 36°C). The corresponding mass loss rate, water absorption, and compressive strength of the specimens at every 10 heat-rain cycles and 10 days were determined. The results show that the mass loss rate gradually increases with the increase in heat-rain cycles and the natural aging days. The variation range was found as about 0.2%~0.7% and -0.4%~0.2%, respectively. The water absorption rate gradually decreases with the number of heat-rain cycles and natural aging days; however, the decay rate of the water absorption rate differs by orders of magnitude in the two weathering conditions. The compressive strength does not have an obvious change with the number of heat rain cycles, but it first increases and then decreases with the number of natural aging days. Under artificial and natural aging, the deterioration mechanism and aging speed of expanded perlite mortar are much different. The comparative analysis of the physical and mechanical properties of expanded perlite mortar under artificially accelerated and natural aging conditions can further reveal its evolution model and the corresponding relationships under the two conditions and provide a theoretical basis for establishing a more scientific and reasonable aging system.

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Durability of the hydrophobic treatment on brick and mortar

Cited by 15 publications

References 41 publications

Laboratory Assessment of Selected Protective Coatings Applied on Two Sandstone Types

Laboratory Assessment of Selected Protective Coatings Applied on Two Sandstone Types

An overview of hydrophobic treatments and their application with Internal Wall Insulation

Experimental investigations on water absorption and mechanical properties of expanded perlite mortar under accelerated and natural aging conditions

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