While raw earth can be used as a structural material, its water sensitivity limits its use in modern construction. Earth has a strong affinity with water. Both water imbibition and water vapour transfer have to be taken into consideration. This affinity can be a positive point to regulate indoor ambience, but it can also negatively affect earth’s mechanical properties. To avoid this possible detrimental effect, bio-based additions are used all around the world to stabilize, protect from water and enhance the mechanical properties of earth-based building materials. Bio-based stabilizers have to limit liquid water absorption and maintain mechanical properties without acting as a water vapour barrier that can lead to durability issues. In this article, capillary water absorption and water vapour permeability measurements are performed for combinations of various earths and bio-based additions (linseed oil, xanthan gum, casein, alginate and tannins). Linseed oil and xanthan gum help to protect the earth-based samples from absorbing liquid water without affecting the water vapour transfer in these materials.

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生物稳定剂对毛细吸收和水蒸气转移到原土中的影响

虽然原土可用作结构材料，但其对水的敏感性限制了其在现代建筑中的使用。地球与水有很强的亲和力。必须同时考虑吸水和水蒸气转移。这种亲和力可以是调节室内氛围的积极因素，但它也会对地球的机械特性产生负面影响。为了避免这种可能的不利影响，世界各地都使用生物基添加剂来稳定、防水并增强土基建筑材料的机械性能。生物基稳定剂必须限制液态水的吸收并保持机械性能，而不会充当可能导致耐久性问题的水蒸气屏障。在本文中，对各种土和生物基添加剂（亚麻籽油、黄原胶、酪蛋白、藻酸盐和单宁）的组合进行毛细管吸水率和水蒸气渗透率测量。亚麻籽油和黄原胶有助于保护地球样品免于吸收液态水，同时不会影响这些材料中的水蒸气传输。