Physical, mechanical, and microstructural characterisation of an innovative thermal insulating render incorporating silica aerogel

Pedroso, Marco; Flores‐Colen, Inês; Silvestre, José Dinis; Gomes, M. Glória; Silva, L.; Ilharco, Laura M.

doi:10.1016/j.enbuild.2020.109793

Cited by 70 publications

(32 citation statements)

References 49 publications

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“…The silica aerogel granules represent around 58% in volume or a total of 37 % (m/m) in the weight, both for the mixture powder. The water/binder ratio was 1.33 (Pedroso et al, 2019;Sousa et al, 2019). This render has also a multilayer coating composed by a basecoat layer, fibreglass mesh, key coat, and an acrylic finishing coat (Pedroso et al, 2019).…”

Section: Methodsmentioning

confidence: 99%

In-Situ Tests on Silica Aerogel-Based Rendering Walls

Flores‐Colen¹,

Pedroso²,

Soares³

et al. 2020

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

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In this paper, two aerogel-based renders are characterized based on in-situ testing of walls prototypes. The in-situ tests to assess the mechanical performance are: pull-off, surface impact tests and compressive strength on collected samples. The physical performance includes the water resistance and thermal conductivity coefficient. The tests carried out to assess water-resistance are: Karsten tube, moisture meter and capillary water absorption of collected samples. The thermal performance was tested based on infrared thermography and thermal conductivity transient method. The combination of these in-situ tests allowed a better performance characterization of the aerogelbased renders and characterized the applied renders. These results were carried out under two national research projects (Nanorender and P2020 PEP).

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Section: Methodsmentioning

confidence: 99%

In-Situ Tests on Silica Aerogel-Based Rendering Walls

Flores‐Colen¹,

Pedroso²,

Soares³

et al. 2020

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

Self Cite

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“…With the inclusion of this nanomaterial in mortars, first done in 2012 by Stahl [31], it started being possible to significantly decrease the thermal conductivity of mortars (<0.060 W•m −1 •K −1 ) [32][33][34], leading to the development and market reach of high-performance thermal insulating mortars [20,32,[35][36][37][38][39].…”

Section: Introductionmentioning

confidence: 99%

Nanomaterials’ Influence on the Performance of Thermal Insulating Mortars—A Statistical Analysis

et al. 2020

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This research provides a statistical analysis of the mechanical and physical properties of thermal insulating mortars developed in the laboratory and by the industry with and without the incorporation of nanomaterials. This was evaluated by carrying out a uni and bivariate analysis, principal components and factor analysis, cluster analysis, and the application of regression models. The results show that it is possible to find associations between these mortars’ properties, but also how these formulations’ development can be approached in the future to achieve better overall performance. They also show that the use of nanomaterials, namely silica aerogel, significantly improved the mortars’ thermal insulation capabilities, allowing us to obtain mortar formulations with thermal conductivities below the values presented by classic thermal insulating materials. Therefore, with this investigation, other researchers can support their product-development choices when incorporating nanomaterials to reduce mortars’ thermal conductivities, increasing their production efficiency, overall multifunctionality, and sustainability.

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“…The experimental methodology used in assessing the durability of a new aerogel cement-based rendering system was studied by Pedroso et al [ 40 ] and is based on adapting existing methodologies. Figure 1 summarizes the experimental methodology, comprising the different specimens, accelerated aging methods, and corresponding durability tests.…”

Section: Methodsmentioning

confidence: 99%

“…In this research, the durability of the new aerogel cement-based rendering system [ 40 , 42 ] was tested under different accelerated aging cycles. This mortar presents a mixture of mineral binders, rheological agents, resins, and hydrophobic agents, among others, in its composition.…”

Section: Methodsmentioning

confidence: 99%

“…Twenty percent (m/m) corresponded to mineral binders, ~37% (m/m) or 70% (of the total volume) to silica aerogel hydrophobic granules, with the remaining proportion related to other components (e.g., lightweight filler) but without sand. This formulation was based on the work developed by Pedroso et al [ 40 ]. The render was mechanically projected onto a wall built using lightweight concrete blocks.…”

Section: Methodsmentioning

confidence: 99%

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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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Physical, mechanical, and microstructural characterisation of an innovative thermal insulating render incorporating silica aerogel

Cited by 70 publications

References 49 publications

In-Situ Tests on Silica Aerogel-Based Rendering Walls

In-Situ Tests on Silica Aerogel-Based Rendering Walls

Nanomaterials’ Influence on the Performance of Thermal Insulating Mortars—A Statistical Analysis

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

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