Erosion Behaviour of Bio-Stabilised Earthen Materials

Abstract:

Development of earthen building materials is one of the answers that the construction sector can provide to tackle the accelerated climate change issue. However, these materials present a wide variability, even at the local scale, and their water durability can be difficult to ensure. In order to improve their durability regarding water and avoid its prejudicial effect on earthen material’s properties, the stabilisation with bio-polymers is an increasingly studied solution. In this paper a ten-minute erosion drip test is developed and performed for various combinations of Breton earths and bio-based additions or surface treatments (linseed oil, xanthan gum, casein, alginate, vegetal varnish and tannins). The final pitting depths and eroded volumes are compared and the evolution of erosion during the test is monitored. These results are also linked to previously obtained water capillary absorption coefficients. The obtained results enable to highlight the impact of bio-based additions on erodibility of earthen materials: linseed oil and xanthan gum help to protect the earth-based samples from erosion. Other original parameters characterizing the erosion of the samples during the drip test are suggested. Limitations of this type of erosion tests are also brought out.

• Periodical: Construction Technologies and Architecture (Volume 1)
• Pages: 234-244
• DOI: https://doi.org/10.4028/www.scientific.net/CTA.1.234
• Online since: January 2022
• Authors: Mathieu Audren*, Simon Guihéneuf, Damien Rangeard, Arnaud Perrot
• Keywords: Bio-Based Stabilisation, Drip Test, Durability, Earthen Construction, Erosion

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