Erosion Behaviour of Bio-Stabilised Earthen Materials

Audren, M.; Guihéneuf, Simon; Rangeard, Damien; Perrot, Arnaud

doi:10.4028/www.scientific.net/cta.1.234

Cited by 3 publications

(1 citation statement)

References 40 publications

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“…Finally, a method by which to formulate an optimal earth mix from several quarry wastes is suggested by linking an inherent material property (clay activity) and a processing property (density) to aim for a final mechanical property (compressive strength). Therefore, the present study complements previous studies on the ability of different quarry byproducts as earth material [33,34], providing a better understanding of their formulation.…”

Section: Introductionsupporting

confidence: 71%

Strategy for the Mix Design of Building Earthen Materials Made of Quarry By-Products

Audren,

Guihéneuf,

Le Borgne

et al. 2023

Buildings

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The use of quarry by-products can enable the commercialization of a clay building material (reconstituted earth) thanks to minimal valorized and perennial stocks of materials. This study shows that quarry by-products can be used to mix design a clay-based building material for the manufacture of CEB. These soils are composed of quarry tailing and clayey muds. Proctor and dry compressive strength tests have shown that the proportion of mud that achieves the highest possible compressive strength is a balance between increasing density through the aggregate arrangement, increasing clay activity, and decreasing density through the increase in water content. These tests resulted in the formulation of materials with compressive strengths of 5.8 MPa and 8.4 MPa at densities of 2135 kg/m3 and 2178 kg/m3. The influence of mud incorporation on the material granulometry and on its characteristics was also studied. Moreover, a model allowing us to link the compressive strength, the clay activity, and the dry density is proposed for the materials composed of quarry by-products. This model enables us to facilitate the mix design and the standardization of the earth material.

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Section: Introductionsupporting

confidence: 71%

Strategy for the Mix Design of Building Earthen Materials Made of Quarry By-Products

Audren,

Guihéneuf,

Le Borgne

et al. 2023

Buildings

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Linseed Oil and Xanthan Gum: Promising Stabilisers for Earthen Building Materials

Guihéneuf

Perrot

Rangeard

2022

Construction Technologies and Architecture

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In the current context, the development of new bio-based and local building materials is becoming mandatory. Among them, earthen materials have a strong potential to be used as sustainable structural materials but their variability and their water sensitivity impact their mechanical properties that are difficult to guaranty. Recent developments have emphasised the ability of some bio-based additions to help to ensure these properties: linseed oil and xanthan gum are part of them. In this paper three different Breton earths, representative of a certain local variability, are studied. The impact of the selected bio-based additions on earths’ rheological behaviour is followed in order to adapt it to different forming processes. Then, the mechanical properties of different earth-addition combinations at the dry state, exposed to hygric variations and immersion are investigated for different forming processes. The findings highlight the fact that xanthan gum and linseed oil have a relevant ability to stabilise earthen blocks, that can be processed using different promising forming methods.

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Bio-Stabilised Earthen Blocks: A Critical Study on Compression Tests of Immersed Samples

Guihéneuf

Perrot

Rangeard

et al. 2022

Construction Technologies and Architecture

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Currently, much consideration is given to earthen building materials regarding their highly sustainable properties. Numerous studies have highlighted their structural ability but their water sensitivity is still limiting a potentially more spread use. To limit this sensitivity several studies have recently brought out the positive effects of bio-stabilisers such as linseed oil or xanthan gum. These recent developments allow bio-stabilized earthen materials to be resistant to immersion in water. Also, a French experimental standard (XP P 13-901) for compressed earth blocks already asks for a minimal compressive strength after a two-hour immersion that is overly severe and is difficult to satisfy without the addition of high contents of hydraulic binders. In this paper, a critical study of this compressive test after immersion is conducted on bio-stabilized (linseed oil and xanthan gum) samples of different Breton earths. Some testing adjustments are suggested and the water-diffusion in the samples is followed and linked to previously obtained capillary absorption coefficients. It is shown that the effect of immersion on the mechanical strength depends on the sample size and that an equivalence between size and immersion time can be made based on an equivalent penetration depth. Linseed oil and xanthan gum help to significantly increase the compressive strength of the earthen materials after immersion and allow to avoid the addition of hydraulic binders in earthen blocks to obtained a strong water resistance. The water diffusion in the sample during the immersion can be linked to capillary absorption behaviour, thus a water content and a compressive strength after a given time of immersion could be easily predicted.

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Erosion Behaviour of Bio-Stabilised Earthen Materials

Cited by 3 publications

References 40 publications

Strategy for the Mix Design of Building Earthen Materials Made of Quarry By-Products

Strategy for the Mix Design of Building Earthen Materials Made of Quarry By-Products

Linseed Oil and Xanthan Gum: Promising Stabilisers for Earthen Building Materials

Bio-Stabilised Earthen Blocks: A Critical Study on Compression Tests of Immersed Samples

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