Parametric Analysis to Study the Influence of Aerogel-Based Renders’ Components on Thermal and Mechanical Performance

Ximenes, Sofia; Silva, Ana; Soares, António O.; Flores‐Colen, Inês; Brito, Jorge de

doi:10.3390/ma9050336

Cited by 11 publications

(3 citation statements)

References 41 publications

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“…Recently, a lot of research effort has been made on evaluating and improving the mechanical strength of the material without compensating its thermal performance (Ximenes et al 2016;de Fátima Júlio et al 2016;Westgate et al 2018). Most of these studies are based on several time-consuming laboratory-based measurements where the material composition of the samples is modified.…”

Section: Introductionmentioning

confidence: 99%

Determination of the Effective Thermal Conductivity of Aerogel-Based Coating Mortars Using Numerical Simulations—Random Packing

Karim,

Hagentoft

2023

Environmental Science and Engineering

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Aerogel-based coating mortars have declared thermal conductivities of 0.03-0.05 W/(m • K), similar to those of conventional thermal insulation materials. Due to the high porosity and fragility of aerogel granules, the material obtains a reduced mechanical strength compared to conventional mortars. Recently, there has been a large research effort on developing new mixtures with improved thermal and mechanical properties. This paper presents and evaluates two-dimensional numerical simulations, based on the random packing technique, as an alternative method to laboratory measurements in predicting the effective thermal conductivity of these mortars. Experimental data from the literature, on thermal conductivity of aerogelbased coating mortars containing 50-90 vol% aerogels were used to validate the simulation results. In this preliminary validation study, a relative error of 6-10% was observed. Future work can focus on improving the accuracy and including the prediction of mechanical properties in the suggested model.

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Section: Introductionmentioning

confidence: 99%

Determination of the Effective Thermal Conductivity of Aerogel-Based Coating Mortars Using Numerical Simulations—Random Packing

Karim,

Hagentoft

2023

Environmental Science and Engineering

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“…Additionally, the incorporation of nanoparticles in mortars could improve their durability compared to traditional building materials [8]. In the specific case of aerogel-based renders, the incorporation of these nanomaterials allowed a reduction in building energy consumption [9][10][11] and wall U-value [12], since they present specific properties (low density and high porosity [13,14] due to its mesoporous structure) that leads to a very low thermal conductivity [15][16][17]. In addition, it is possible to include aerogel in different materials and components [18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Durability of a New Thermal Aerogel-Based Rendering System under Distinct Accelerated Aging Conditions

et al. 2021

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The widespread application of innovative thermal enhanced façade solutions requires an adequate durability evaluation. The present work intends to assess the durability of a new aerogel cement-based rendering system through the adaptation of different accelerated aging cycles, such as heating–freezing, freeze–thawing, and heat–cold. Several mechanical properties and also capillary and liquid water absorptions were tested for uncoated and coated specimens. A decrease in the mechanical strength, especially after freeze–thaw cycles, was observed. However, the water action promoted the late hydration of the cement paste contributing to the densification of the matrix and, consequently, the increase of the adhesive strength. Additionally, a decrease in the dynamic modulus of elasticity and an increase in the Poisson’s ratio were observed after aging, which indicates a higher capacity of the render to adapt to substrate movements, contributing to a reduction of cracking.

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“…The investigation concludes that an overall improvement of the rendering's performance needs an adaptation of the composition, such as water to binder ratio and surfactant content. An extensive parametric analysis of the influence of different binders on the performance of aerogel-based renders is given in [21]. The lowest thermal conductivity reported therein was around 0.057 W/(m•K), which is not competitive as there are conventional insulating plasters with a slightly higher value of around 70-80 W/(m•K) at a much lower price.…”

Section: Introductionmentioning

confidence: 99%

Stability Relevant Properties of an SiO2 Aerogel-Based Rendering and Its Application on Buildings

2021

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Aerogel-based renderings and plasters have been spreading throughout Europe for nearly a decade. Several national and EU-funded projects have addressed this interesting building product, both at research level within academia and at application level within R&D of renowned industrial enterprises. At present, a number of investigations into the hygro-thermal, chemical and application properties of a commercially successful aerogel-based rendering and its main ingredient, SiO2 aerogel granules, have been undertaken. Immersion in water showed that even under harsh circumstances water does not enter the aerogel granules, but rather accumulates in the porous phase surrounding the granules. A further immersion in calcium hydroxide at different temperatures did not affect the aerogel granule either, which indicates the robustness of the granules with respect to their exposure to moisture and chemical deterioration emerging from the construction materials the rendering is applied on. An executed application to a historic building with a structured finish, and without any reinforcement mesh, showed the advantage of a versatile applicability of this rendering when the external appearance and visible details of a façade must be kept unchanged. The investigation is rounded off by an infrared picture taken on a cold day showing the thermal influence of the aerogel-based rendering, and its effectiveness for reducing heat loss in buildings.

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Parametric Analysis to Study the Influence of Aerogel-Based Renders’ Components on Thermal and Mechanical Performance

Cited by 11 publications

References 41 publications

Determination of the Effective Thermal Conductivity of Aerogel-Based Coating Mortars Using Numerical Simulations—Random Packing

Determination of the Effective Thermal Conductivity of Aerogel-Based Coating Mortars Using Numerical Simulations—Random Packing

Durability of a New Thermal Aerogel-Based Rendering System under Distinct Accelerated Aging Conditions

Stability Relevant Properties of an SiO2 Aerogel-Based Rendering and Its Application on Buildings

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