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

Joana Maia,Luís Silva,Pedro F Pereira,Inês Flores-Colen,Nuno M M Ramos,Marco Pedroso

doi:10.3390/ma14185413

Joana Maia, Luís Silva + Show 4 more

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https://doi.org/10.3390/ma14185413

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Journal: Materials	Publication Date: Sep 18, 2021
Citations: 13	License type: CC BY 4.0

Affiliation: University of Porto, University of Lisbon

Abstract

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.

Highlights

IntroductionTo obtain more durable and, more sustainable buildings, the improvement of materials, with a particular emphasis on envelopes, takes a very important role by increasing their performance, enhancing the service life, and lowering the production and accumulation of waste [1]
Regarding the high disruption of results were compared with a specimen that was not submitted to accelerated aging
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Summary

Introduction

To obtain more durable and, more sustainable buildings, the improvement of materials, with a particular emphasis on envelopes, takes a very important role by increasing their performance, enhancing the service life, and lowering the production and accumulation of waste [1]. Regarding the strict European criteria for the U-value (thermal transmittance) of building envelopes [3], several studies on the development of thermal enhanced building materials and components have been performed, with a special interest in thermal mortars [4,5,6,7]. 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

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