Intrinsic Hydrophobicity of Rammed Earth

Holub, Marián; Stone, Clayton; Bálintová, Magdaléna; Grul, R

doi:10.1088/1757-899x/96/1/012024

Cited by 4 publications

(7 citation statements)

References 3 publications

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“…Recently, following the major priority of more sustainable construction, earth resurged as a more ecofriendly building material [7][8][9]. The high abundance, low cost of production and raw materials, insulation properties, ability to regulate humidity in the building environment, reduced environmental impact and low embodied energy are some of the main reasons for the renewed interest in earth construction [1,7,[10][11][12][13]. Moreover, some of the existing earth buildings repressent historical heritage and have to be preserved [14].…”

Section: Introductionmentioning

confidence: 99%

“…Due to their hygroscopic and hydrophilic nature, water penetration is heightened in earth building materials and severe degradation may occur in rainy climates [17,18]. Moreover, damp walls lead to problems of staining, mold growth, cryptoflorescences, and reduction of insulation properties [12,15,18]. This makes these materials impractical under current unsheltered, exposed conditions.…”

Section: Introductionmentioning

confidence: 99%

“…As mentioned, one major challenge is mitigating the effect of moisture ingress and consequent decay of earth building materials properties. This is especially relevant because uncoated earth solutions are usually considered due to their recognized aesthetical value [12].…”

Section: Introductionmentioning

confidence: 99%

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Influence of Water-Repellent Admixtures on the Water-Resistance of Unstabilized and Stabilized Compressed Earth Blocks

Bogas¹

2020

Int. J. Archit. Eng. Technol.

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The low durability of water action has been the main issue of earth construction since ancient times. In this way, sustainable solutions are needed to improve the earthen building materials water-resistance performance without significantly changing their appearance and eco-friendly nature. This study aims at characterizing the water-resistance of compressed earth blocks (CEB) produced with or without different types of colorless water-repellent admixtures. To this end, different types of unstabilized and 8% cement stabilized CEB were protected with two post-surface treatments, namely a silane-siloxane based surface water-repellent (SWR) and a natural linseed oil (LO), as well as one olein based integral water-repellent (IWR). Unprotected reference CEB were also considered for comparison purposes. More sustainable CEB were produced with 20% replacement of earth by recycling waste building materials. The CEB were tested in terms of compressive and flexural strength, capillary water absorption, immersion absorption, water permeability, low-pressure water absorption, and water erosion resistance from drip and spray tests. The influence of the moisture content on the compressive strength was also analysed. The cement-stabilization and water-repellent treatments were able to overcome the non-water-resistant nature of unstabilized CEB. In general, the best performance was attained with SWR, followed by IWR. The LO was less effective in reducing the long-term absorption but was able to protect unstabilized CEB from light rainfall simulated conditions. Under severe water erosion, the surface treatments were less effective, but water penetration was reduced up to near 40%. The mechanical strength, total porosity, water permeability and immersion absorption were not significantly affected by water-repellent products. Moreover, the mechanical strength reduction of stabilized CEB after saturation was about 30%, regardless of the water-repellent treatment. The main contribution of water-repellent admixtures occurred in all properties involving capillary absorption.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of Water-Repellent Admixtures on the Water-Resistance of Unstabilized and Stabilized Compressed Earth Blocks

Bogas¹

2020

Int. J. Archit. Eng. Technol.

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“…Silane-based materials have also been used as hydrophobic coatings and have proven effective in monuments and historical earthen buildings with no ill effect on their strength (e.g. Holub et al, 2015). Using cementing or bonding additives in the soil matrix (or so-called stabilizers or integral admixtures) to enhance the strength is widely accepted.…”

mentioning

confidence: 99%

Stabilization of an earthen material with Tung oil: compaction, strength and hydrophobic enhancement

Lin

Liu

Lourenço

et al. 2021

Construction and Building Materials

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“…The clay minerals that act as a binder in unfired earthen materials acquire their strength only during the drying process and clay minerals lose strength due to the influence of moisture. Creating a water-repellent coating on the surface of unfired earthen material structures provides a good protection against the influence of moisture [2,6,[22][23][24][25].…”

mentioning

confidence: 99%

Mechanical Properties of Rammed Earth With Respect to Clay Mixture Composition

Otcovská¹,

Mužíková²,

Padevět³

2019

Acta Polytech

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Unfired earth is a traditional building material, but it is less used than other building materials, such as concrete or steel. But the use of unfired earth is experiencing a renaissance. ammed earth is a type of unfired earth and is usually used for load bearing structures. This paper descries an experimental determination of the tensile bending strength and compressive strength of the rammed earth specimens with known compositions. Mechanical properties are dependent on these compositions (kind of clay, amount of clay, amount of mixture water). Laboratory specimens were produced without inorganic binders or fibrous admixtures. We observed higher tensile bending strengths and lower compressive strengths in specimen mixtures containing more clay. The obtained results were evaluated in a context of a previous research. The results were also compared with results published by another author.

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Intrinsic Hydrophobicity of Rammed Earth

Cited by 4 publications

References 3 publications

Influence of Water-Repellent Admixtures on the Water-Resistance of Unstabilized and Stabilized Compressed Earth Blocks

Influence of Water-Repellent Admixtures on the Water-Resistance of Unstabilized and Stabilized Compressed Earth Blocks

Stabilization of an earthen material with Tung oil: compaction, strength and hydrophobic enhancement

Mechanical Properties of Rammed Earth With Respect to Clay Mixture Composition

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