The moisture buffering performance of plasters when exposed to simultaneous sinusoidal temperature and RH variations

Cascione, Valeria; Maskell, Daniel; Shea, Andrew; Walker, Pete

doi:10.1016/j.jobe.2020.101890

Cited by 7 publications

(10 citation statements)

References 18 publications

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“…Specimens were tested in an environmental chamber (ACS Compact Test Chambers DY110), into which a mass balance were placed to continuously measure the change in weight, as shown in Figure 1. More details of the set-up can be seen in [8] The tests followed the general guidelines for humidity variations and test set-up of the NORDTEST protocol [14]. The materials were exposed before each tests to 24 h pre-conditioning at 23 • C and 54%RH, and to six cyclic humidity and temperature variations at an air speed of 0.1 m/s.…”

Section: Experimental Designmentioning

confidence: 99%

“…The lack of heating and well insulated walls might generate significant daily or seasonal indoor humidity and temperature fluctuations, depending on the climate and location of the building [6,7]. The simultaneous variations of temperature and RH can produce significant variation in moisture exchange between materials and the environment [8].…”

Section: Introductionmentioning

confidence: 99%

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Moisture Buffering in Surface Materials Due to Simultaneous Varying Relative Humidity and Temperatures: Experimental Validation of New Analytical Formulas

et al. 2020

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Buildings are subjected to the indoor environment, especially in non-controlled climates. Temperature and humidity variations might effect or even damage materials sensitive to moisture. For this reason, it is important to understand the response of hygroscopic materials to variable indoor environmental conditions. Existing methods looked into the dynamic sorption capacity of materials, by analysing the impact of only humidity fluctuations, with temperature usually considered non-influential or non variable. However, temperature fluctuations may impact the moisture capacity of the materials, as materials properties might substantially vary with temperature. Moreover, in existing protocols, the humidity variations are considered to be varying under square wave fluctuations, which may not be applicable in environments, where the indoor is influenced by daily and seasonal climate variations, which presents more complex fluctuation. In this study, a simulation method that can predict the impact of environmental condition on materials under simultaneous temperature and humidity fluctuations was developed. Clay and gypsum plaster were analysed in the numerical model and results were then validated with experimental data. Materials were subjected to either sinusoidal and triangular temperature and RH variations and different cycle time intervals. The investigation of sinusoidal and triangular environmental variations pushed to a better understanding of materials response to different environments and to the improvement of the simplified model. The development of a simplified model can realistically predict the potential future impact of climate changes on buildings without the use of complex and memory demanding computational methods.

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Section: Experimental Designmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Moisture Buffering in Surface Materials Due to Simultaneous Varying Relative Humidity and Temperatures: Experimental Validation of New Analytical Formulas

et al. 2020

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“…The common practice adopted for measuring hygroscopic properties of building materials is the NORDTEST [2], and the evaluation of the Moisture Buffering Value (MBV) is the typical method to compare different materials. Usual plasters, such as gypsum and lime, have experienced moderate values of MBV within the range of 0.6-1.5 g/(m 2 %RH) [5] and own the label of moderate and good materials according to NORDTEST. A typical strategy to increase the MBV of construction materials, like cement and limestone, is using additional hygroscopic compounds, like natural or synthetic fibers such as palm and hemp.…”

Section: Introductionmentioning

confidence: 99%

“…The addition of zeolite, for example, increases the number of active sites to operate the moisture sorption and desorption that, together with an increase of global porosity, improve the buffering properties of the mortar. Based on this concept, He et al [7] tested a composite mortar based on zeolite (20%wt), PCM, and gypsum, obtaining a practical MBV of 2.9 g/(m 2 %RH), consistently higher than pristine gypsum plaster [5]. An alternative approach belonging to the same category is using hygroscopic polymers.…”

Section: Introductionmentioning

confidence: 99%

Super adsorbent bio-polymer additive to improve hygroscopic and acoustic properties of a conventional lime plaster

Gentile,

Libralato,

Fantucci

et al. 2023

J. Phys.: Conf. Ser.

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The paper introduces a new lime plaster composition, with a Super Bio-Polymeric Adsorbent (SABP), for interior applications to improve hygrothermal and acoustic comfort. Alginate SABP is added to a conventional lime plaster to improve hygroscopic and acoustic performance. The hygrothermal and acoustic properties of the modified plaster are compared with the ones of the original plaster with a preliminary moisture uptake test, the evaluation of the sorption isotherm, the moisture buffering value (MBV), and the acoustic absorption. The results show a significant increase in the equilibrium moisture contents and the MBV (from 0.7 to 6.2 g/(m2⋅%RH)). At the same time, the sound absorption coefficient is slightly improved, increasing 0.1-0.2 at frequencies higher than 500 Hz compared to the reference conventional lime plaster. The paper describes the material characterization: the sorption isotherm and the MBV are obtained using a dynamic vapor sorption (DVS) analyzer. The acoustic absorption is measured using the impedance tube method.

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“…In the literature, the MBV was determined at a constant temperature (e.g., 23 • C), while, in reality, the indoor temperature in buildings is under variable dynamic conditions. Some experimental studies found in the literature on hygroscopic materials [13,33,34] showed that the MBV is influenced by the temperature and the increase in temperature induces an increase in the MBV. For example, MBVs of palm concrete which were measured at 23 • C and 10 • C by Chennouf et al (2018) [13] were 2.96 and 2.03 g/(m 2 %RH), respectively (with a percentage deviation of 31.42%).…”

Section: Introductionmentioning

confidence: 99%

Impact of Temperature on the Moisture Buffering Performance of Palm and Sunflower Concretes

Igue

Bourdot

et al. 2021

Applied Sciences

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The use of bio-based materials (BBM) in buildings is an interesting solution as they are eco-friendly materials and have low embodied energy. This article aims to investigate the hygric performance of two bio-based materials: palm and sunflower concretes. The moisture buffering value (MBV) characterizes the ability of a material or multilayer component to moderate the variation in the indoor relative humidity (RH). In the literature, the moisture buffer values of bio-based concretes were measured at a constant temperature of 23 °C. However, in reality, the indoor temperature of the buildings is variable. The originality of this article is found in studying the influence of the temperature on the moisture buffer performance of BBM. A study at wall scale on its impact on the indoor RH at room level will be carried out. First, the physical models are presented. Second, the numerical models are implemented in the Simulation Problem Analysis and Research Kernel (SPARK) suited to complex problems. Then, the numerical model validated with the experimental results found in the literature is used to investigate the moisture buffering capacity of BBM as a function of the temperature and its application in buildings. The results show that the temperature has a significant impact on the moisture buffering capacity of bio-based building materials and its capacity to dampen indoor RH variation. Using the numerical model presented in this paper can predict and optimize the hygric performance of BBM designed for building application.

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The moisture buffering performance of plasters when exposed to simultaneous sinusoidal temperature and RH variations

Cited by 7 publications

References 18 publications

Moisture Buffering in Surface Materials Due to Simultaneous Varying Relative Humidity and Temperatures: Experimental Validation of New Analytical Formulas

Moisture Buffering in Surface Materials Due to Simultaneous Varying Relative Humidity and Temperatures: Experimental Validation of New Analytical Formulas

Super adsorbent bio-polymer additive to improve hygroscopic and acoustic properties of a conventional lime plaster

Impact of Temperature on the Moisture Buffering Performance of Palm and Sunflower Concretes

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