Moisture buffer, fire resistance and insulation potential of novel bio-clay plaster

Jiang, Yunhong; Phelipot-Mardelé, Annabelle; Collet, Florence; Lanos, Christophe; Lemke, Manfred; Ansell, Martin P.; Hussain, Atif; Lawrence, Michael B.

doi:10.1016/j.conbuildmat.2020.118353

Cited by 29 publications

(16 citation statements)

References 28 publications

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“…In a comparison of MBV values measured for SAP-modified plasters in this paper with the results obtained by other investigators for different plasters designed with the same goal, SAPs utilization seems to be very efficient. Jiang et al [ 56 ], who used hemp powder as a hygroscopic agent, achieved only moderate improvement; the studied bio-clay plaster remained classified as good, with MBV ranging between 1.2 and 1.6 g/(m 2 ·% RH). MBV obtained by the utilization of perlite, sepiolite, or vermiculite showed only limited improvement <25% [ 32 , 38 ].…”

Section: Resultsmentioning

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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Section: Resultsmentioning

confidence: 99%

Functional Properties of SAP-Based Humidity Control Plasters

et al. 2021

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“…Theoretically, clay can be recycled indefinitely. Since both components, clay and mycelium composite, can be used in agriculture to soil admendment, 26 it is not obligatory to separate both layers during demolition. Figure 9 shows that the growth of the mycelium is very strong on the clay surface, which indicates a reliable connection on a large scale.…”

Section: Discussionmentioning

confidence: 99%

Investigation of the interface of fungal mycelium composite building materials by means of low‐vacuum scanning electron microscopy

Lehmann,

Schmidt,

Stephan

et al. 2024

Journal of Microscopy

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Low‐vacuum scanning electron microscopy (low‐vacuum SEM) is widely used for different applications, such as the investigation of noncoated specimen or the observation of biological materials, which are not stable to high vacuum. In this study, the combination of mineral building materials (concrete or clay plaster) with a biological composite (fungal mycelium composite) by using low‐vacuum SEM was investigated.Fungal biotechnology is increasingly gaining prominence in addressing the challenges of sustainability transformation. The construction industry is one of the biggest contributors to the climate crises and, therefore, can highly profit from applications based on regenerative fungal materials. In this work, a fungal mycelium composite is used as alternative to conventional insulating materials like Styrofoam. However, to adapt bio‐based products to the construction industry, investigations, optimisations and adaptations to existing solutions are needed. This paper examines the compatibility between fungal mycelium materials with mineral‐based materials to demonstrate basic feasibility. For this purpose, fresh and hardened concrete specimens as well as clay plaster samples are combined with growing mycelium from the tinder fungus Fomes fomentarius. The contact zone between the mycelium composite and the mineral building materials is examined by scanning electron microscopy (SEM).The combination of these materials proves to be feasible in general. The use of hardened concrete or clay with living mycelium composite appears to be the favoured variant, as the hyphae can grow into the surface of the building material and thus a layered structure with a stable connection is formed.In order to work with the combination of low‐density organic materials and higher‐density inorganic materials simultaneously, low‐vacuum SEM offers a suitable method to deliver results with reduced effort in preparation while maintaining high capture and magnification quality. Not only are image recordings possible with SE and BSE, but EDX measurements can also be carried out quickly without the influence of a coating. Depending on the signal used, as well as the magnification, image‐recording strategies must be adapted. Especially when using SE, an image‐integration method was used to reduce the build‐up of point charges from the electron beam, which damages the mycelial hyphae. Additionally using different signals during image capture is recommended to confirm acquired information, avoiding misinterpretations.

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“…Clay materials, compared to other building materials, have both a low environmental impact [ 14 , 15 , 16 ] and a high specific surface area [ 17 , 18 , 19 , 20 ]. Therefore, it is a very suitable material for interior moisture control [ 21 , 22 , 23 ].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Clay Structures to the Hygrothermal Component of the Indoor Environment

Diviš

Růžička

2022

Materials

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In this article, research on the sorption properties of clay materials in comparison with commonly used building materials is published. The topic is mainly focused on the dynamic sorption properties and their influence on the relative humidity in the indoor environment. The results of comparisons of clay structures, rammed earth panels, clay plaster, and unburned bricks, with commonly used building materials, concrete, lime plaster, and gypsum board are examined. Statistically evaluated results in the form of confidence intervals are presented and the rate of dynamic sorption is analyzed. It is clear from the results that clay materials have a positive effect on the rapid adsorption and desorption of air moisture in the interior of buildings. However, there are many variables, band not every clay material has such excellent sorption properties.

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Moisture buffer, fire resistance and insulation potential of novel bio-clay plaster

Cited by 29 publications

References 28 publications

Functional Properties of SAP-Based Humidity Control Plasters

Functional Properties of SAP-Based Humidity Control Plasters

Investigation of the interface of fungal mycelium composite building materials by means of low‐vacuum scanning electron microscopy

The Influence of Clay Structures to the Hygrothermal Component of the Indoor Environment

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