Evaluation of the hygrothermal properties of thermal rendering systems

Maia, Joana; Ramos, Nuno M. M.; Veiga, Rosário

doi:10.1016/j.buildenv.2018.08.055

Cited by 45 publications

(23 citation statements)

References 36 publications

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“…As one can see, an increased amount of SAP content in mixture induced a reduction in the bulk density, while the matrix density was kept almost at the same level. The particular importance needs to be paid on the changes in the amount of pores since the water vapor absorption correlates with the volume of the porous space [39]. The lowest total porosity belonged to the reference plaster, while the modified plaster by SAPs resulted in an increased level of porosity.…”

Section: Resultsmentioning

confidence: 99%

Influence of Superabsorbent Polymers on Moisture Control in Building Interiors

et al. 2020

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Moisture loads in building interiors are accompanied by a deterioration of the indoor air quality. Such a phenomenon may induce serious health risks for building inhabitants as well as degradation of furnishing. Unfortunately, the employment of additional heat, ventilation and air conditioning (HVAC) devices does not comply with the sustainability principle due to increased energy consumption, thus cannot be viewed as an efficient solution. This study deals with the use of superabsorbent polymers (SAP) in cement-lime plasters, thus extends the current state of knowledge and outlines further possible development of novel moisture responsive plasters since lightweight aggregates do not provide the desired performance. To be specific, this paper contemplates the experimental analysis of novel plasters modified by 0.5, 1 and 1.5 wt. % of SAP to obtain input parameters for computational modeling. Based on the obtained outputs, the incorporation of SAP admixture resulted in a substantial increase in moisture transport properties including the water absorption coefficient and water vapor diffusion properties. The performed computational modeling revealed a considerable reduction of relative humidity fluctuations, thus mitigation of potential health issues associated with undesired moisture content in building interiors. Achieved results indicate that the SAP enhanced plasters have substantial passive moisture buffering performance and thus may contribute to the improvement of indoor air quality.

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Section: Resultsmentioning

confidence: 99%

Influence of Superabsorbent Polymers on Moisture Control in Building Interiors

et al. 2020

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“…According to the requirements applicable to thermal mortars and considering their relevant properties, a methodology regarding the application of the thermal mortars in multi-layer systems is presented in Figure 5. The knowledge of the physical and hygrothermal behaviour of the referred systems is based on the work developed in Maia, Ramos, and Veiga (2018).…”

Section: A New Durability Assessment Methodology -Methodological Processmentioning

confidence: 99%

Development of an Integrated Durability Assessment Methodology of Thermal Mortars Applied in Multi-layer Systems

Maia¹,

Ramos²,

Veiga³

2020

XV International Conference on Durability of Building Materials and Components. eBook of Proceedings

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A gap in the durability assessment of thermal mortars applied in multi-layer systems was observed. The existing standardisation for the durability assessment of hardened mortars does not include a consistent evaluation of thermal coatings applied in multilayer systems, which motivated the development of a new durability assessment methodology. The determination of the physical, hygrothermal and mechanical properties allowed deepening the knowledge of thermal mortars, contributing to develop more reliable simulations. The existing durability methodologies applicable to one-coat mortars and those applicable to thermal multilayer systems (such as ETICS-External Thermal Insulation Composite Systems) are suitable to be adapted to thermal rendering and plastering systems since they present some similar characteristics. The methodology takes into account the material characteristics and specific requirements, such as the application and climatic conditions. The knowledge of these parameters allows the definition of representative accelerated ageing cycles of the relevant degradation mechanisms. The combination of existing procedures with hygrothermal simulation allowed the development of accelerated ageing cycles, taking into account the European climatic context. The existing procedures allowed analysing several degradation mechanisms, but the fixed parameters are not transversal to different climates. The developed methodology allows a realistic durability evaluation since the ageing cycles are adapted to thermal mortars and real climate conditions, contrary to the existing standardised procedures.

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“…Such intentions complied with the increased efforts of scientists towards improvements in the thermal performance of building envelopes. In this sense, many research studies aimed at the investigation of thermal insulation walls, heat transfer in porous building materials, application of different material layers including insulation materials, or utilization of various admixtures including phase change materials were carried out on this account [2][3][4][5][6][7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Highly porous materials were considered as potentially suitable admixtures to plasters and mortars by various researchers in order to access passive solutions for the abovementioned issue [27,28]. In particular, the lightweight Polymers 2021, 13, 2279 2 of 17 aggregates, such as perlite, charcoal, and vermiculite, became popular for the attempts to provide the required material performance [6,[29][30][31]. Notwithstanding, the effectiveness of these admixtures did not provide satisfactory results and only minor improvements were achieved.…”

Section: Introductionmentioning

confidence: 99%

Functional Properties of SAP-Based Humidity Control Plasters

et al. 2021

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The application of materials with high moisture storage capacity close to the interior surface presents a prospective passive method for improving indoor relative humidity conditions. In this paper, lime-cement plasters containing three different types of superabsorbent polymers (SAPs) in varying dosages are introduced and their mechanical, hygric, and thermal characteristics are analyzed in a relation to microstructure. The experimental results show a significant effect of both SAP amount and chemical composition on all functional properties of studied plasters. The incorporation of 1.5% of SAP may induce up to 2.5 better moisture buffering, thus significantly improving the passive humidity control capability. Considering overall functional parameters of SAP-modified plasters, the dosage of 1 wt.% can thus be viewed as a rational compromise between the moisture storage capability and mechanical properties. The obtained wide sets of parameters can be utilized directly as input data of computational models suitable for the assessment of the interior microclimate of residential and administrative buildings.

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Evaluation of the hygrothermal properties of thermal rendering systems

Cited by 45 publications

References 36 publications

Influence of Superabsorbent Polymers on Moisture Control in Building Interiors

Influence of Superabsorbent Polymers on Moisture Control in Building Interiors

Development of an Integrated Durability Assessment Methodology of Thermal Mortars Applied in Multi-layer Systems

Functional Properties of SAP-Based Humidity Control Plasters

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