Effect of Surface Temperature on Water Absorption Coefficient of Building Materials

Mukhopadhyaya, Phalguni; Kumaran, Kumar; Normandin, Nicole; Goudreau, Patrick

doi:10.1177/0075424202026002974

Cited by 45 publications

(35 citation statements)

References 1 publication

(3 reference statements)

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“…Mukhopadhyaya et al confirmed the temperature influence on capillary absorption coefficient of brick specimens in his study with different porous materials [16]. In order to minimize the effect of temperature on our results, tests were performed in a room with controlled temperature.…”

Section: Introductionmentioning

confidence: 72%

Effect of salts and absorption cycles in the capillary coefficient of building materials with different joints

2016

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in buildings, may be explained by the capillary water migration from the the soil through the porous network of the materials in the building elements. In old buildings, mostly constucted in mansory, the effects of rising damp assume a greater expression, due to the porous materials tipically used such as ceramic bricks, mortars and stones [1], [2].The presence of dissolved salts in the water, which up rises through the porous network of building elements, constitutes an annoying factor for its degradation [8], [9]. The salts follow the water during its rise in liquid phase, however the same doesn't occur when the water evaporates. The salts remain in the pores of the building materials, eventually crystallizing after the solution has reached its super-saturation state. The salt crystallization can occur on the surface of the materials, developing efflorescence that disturb the aesthetical appearance of the building, or inside the porous network, dealing great pressures in the pore walls that can fragment them when exceeds its mechanical resistance [10], [11]. The hygrothermal variations of the surronding environment may promote cycles of crystallization/dissolution and develop breaking tensions in the pores for each cycle.The elements and components in the constructive systems, specially the masonry, hinge their functional efficiency on the combination of different materials and characteristics, which adds to the complexity of the moisture transfer analysis. This heterogeneity require knowledge about the individual characteristics of the materials as well as the continuity conditions of the interface that separates the different materials, bidding the crucial importance of the study of the joints influence in the transport phenomenon [12], [13], [14].This paper intends to report the experimental work carried out with brick specimens, aiming to evaluate the effect of salt solutions in the capillary absorption of monolithic and multilayer brick specimens in comparison with water. Sodium sulphate and potassium chloride were the chosen salts to perform the experiments. The first is one of the salts that impose more degradation to buildings, the second was chosen for being very commonly found in building materials, especially the ion chloride. Materials and methodsThe test specimens used were nine red brick monolithic samples with the dimensions 5 × 5 × 10 cm 3 (three for each Rising damp can reduce building's aesthetical value, comfort and health mark, when combined with the existence of soluble salts in the building components and in the ground water can even lead to material decomposition and compromise its structural performance. This research work intended to study the effect of different absorption cycles of two saturated solutions of sodium sulphate and potassium chloride in the capillary absorption curves obtained through the partial immersion of red brick samples without and with different joints. The results revealed significant differences in the capillary coefficients obtained when samples were tested wit...

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Section: Introductionmentioning

confidence: 72%

Effect of salts and absorption cycles in the capillary coefficient of building materials with different joints

2016

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“…Currently researchers from the Institute for Research in Construction (IRC) are looking at the possibility to incorporate temperature effects on the moisture (both liquid and vapor) transport properties of building materials into the moisture management strategy. As a part of it, recent studies at the IRC [13] established that higher surface temperature of the material causes higher liquid moisture diffusion into 'eastern white pine wood'. However, negligible or little effects were found on liquid moisture diffusion in the same study when the materials were 'red clay brick' or 'concrete'.…”

Section: Research Background and Significancementioning

confidence: 99%

Use of the Modified Cup Method to Determine Temperature Dependency of Water Vapor Transmission Properties of Building Materials

Petersen¹,

Link²,

Mukhopadhyaya

et al. 2005

Journal of Testing and Evaluation

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/npsi/ctrl?lang=en http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/ctrl?lang=fr Access and use of this website and the material on it are subject to the Terms and Conditions set forth at http://nparc.cisti-icist.nrc-cnrc.gc.ca/npsi/jsp/nparc_cp.jsp?lang=en NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. Testing and Evaluation, 33, 5, pp. 316-322, 2005-09-01 Use of the modified cup method to determine temperature dependency of water vapor transmission properties of building materials Mukhopadhyaya, P.; Kumaran, M. K.; Lackey, J. C. Abstract: This paper describes a 'modified cup method' and its application to investigate the effects of temperature on the water vapor transmission properties of building materials. 'Modified cup method' is a simple and versatile technique that allows the user to vary the temperature condition of the test without altering the relative humidity. Two commonly-used building materials considered in this study were fiberboard, and gypsum board. The five temperature levels under consideration were between 7°C and 43°C. The water vapor transmission properties were measured at 50 % average relative humidity. The results obtained from these tests are critically analyzed and reported in this paper. These results demonstrate that there is a steady exponential increase of water vapor transmission (WVT) rate, through both the materials tested, with temperature. However, water vapor permeability (WVP) through the materials shows no significant change due to the variation of temperature between 7 and 43°C. The general observations made in this study confirm that the 'modified cup method' could be used reliably to measure water vapor transmission properties of building materials. Detailed analysis of the test results also reaffirm the fact that, for fiberboard and gypsum board, at 50 % average relative humidity condition, the water vapor permeability is not dependent on the temperature condition. Journal of

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“…There was no significant difference between the results of the two planes. The absorption coefficient for the chestnut was lower than that of the pine, 1.1x10 -2 kg·m -2 ·s -0.5 (Mukhopadhyaya et al 2002). Even though the coatings had an organic solvent base, the water absorption coefficient can be considered an indication of the mechanisms for liquid absorption which could explain the differences between chestnut and pine.…”

Section: Resultsmentioning

confidence: 93%

The Effect of Wood Species on the Anti-Skid Resistance of Coatings

Fernández¹,

Fernández²,

Rodríguez³

et al. 2013

Maderas, Cienc. tecnol.

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The anti-skid resistance of six coatings (Alfa, Beta, Gamma, Lambda, Mu and Theta) designed for outdoor wood flooring were tested in chestnut (Castanea sativa Mill.) and pine (Pinus pinaster Ait.) using a Portable Skid Resistance Tester according to standard ENV 12633. Film thickness, coating retention level, and presence of mineral particles were determined for each coating. Furthermore, the liquid water absorption coefficient of chestnut was determined in accordance with standard UNE-EN 1609, to relate all parameters.The highest value of skid resistance in both chestnut and pine was obtained with coating Mu (49.75) and coating Gamma (53.16), respectively. Film thickness and coating retention level were consistently higher for pine than for chestnut. Gamma presented the highest presence of minerals. For chestnut the absorption coefficient of liquid water in the tangential direction was 0.0056 ± 0.0010 kg·m -2 ·s -0.5 , considerably lower than the value found for pine: 0.011 kg·m -2 ·s -0.5 . The different performance of the system wood-coating, and consequently the anti-skid resistance, was attributed to the absorption properties of the different species.

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Effect of Surface Temperature on Water Absorption Coefficient of Building Materials

Cited by 45 publications

References 1 publication

Effect of salts and absorption cycles in the capillary coefficient of building materials with different joints

Effect of salts and absorption cycles in the capillary coefficient of building materials with different joints

Use of the Modified Cup Method to Determine Temperature Dependency of Water Vapor Transmission Properties of Building Materials

The Effect of Wood Species on the Anti-Skid Resistance of Coatings

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