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首页> 美国卫生研究院文献>other >The Influence of the Type of Lime on the Hygric Behaviour and Bio-Receptivity of Hemp Lime Composites Used for Rendering Applications in Sustainable New Construction and Repair Works
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The Influence of the Type of Lime on the Hygric Behaviour and Bio-Receptivity of Hemp Lime Composites Used for Rendering Applications in Sustainable New Construction and Repair Works

机译：石灰类型对可持续新建和维修工程中用于渲染应用的大麻石灰复合材料的液压性能和生物接受度的影响

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摘要

The benefits of using sustainable building materials are linked not only to the adoption of manufacturing processes that entail reduced pollution, CO2 emissions and energy consumption, but also to the onset of improved performance in the building. In particular, hemp-lime composite shows low shrinkage and high thermal and acoustic insulating properties. However, this material also shows a great ability to absorb water, an aspect that can turn out to be negative for the long-term durability of the building. For this reason, the hygric properties of hemp-based composites need to be studied to ensure the correct use of this material in construction and repair works. The water absorption, drying and transpirability of hemp composites made with aerial (in the form of dry powder and putty) and hydraulic limes were investigated here and related to the microbial growth induced by the water movements within the material. Results show that hemp-natural hydraulic lime mixes exhibit the highest transpirability and drying rate, the lowest water absorption by immersion and capillary uptake and the least intense microbial attack and chromatic change. A microscopical study of the hemp shives also related their great ability to absorb water to the near-irreversible swelling of their structure under dry-wet conditions.
机译：使用可持续建筑材料的好处不仅与采用减少污染，减少二氧化碳排放和降低能源消耗的制造工艺有关，而且与建筑性能的提高有关。特别地，大麻-石灰复合材料显示出低收缩率以及高的隔热和隔音性能。但是，这种材料也显示出强大的吸水能力，这对于建筑物的长期耐用性可能是不利的。因此，需要研究大麻基复合材料的保湿性能，以确保在建筑和维修工作中正确使用该材料。本文研究了用气溶胶（以干粉和油灰的形式）和水硬性石灰制成的大麻复合材料的吸水，干燥和蒸腾作用，并与材料中水的运动引起的微生物生长有关。结果表明，大麻天然水硬性石灰混合物表现出最高的蒸腾作用和干燥速率，通过浸入和毛细管吸收的吸水率最低，而微生物侵袭和颜色变化最小。大麻细屑的微观研究还表明，它们在干湿条件下吸收水分的巨大能力与其结构几乎不可逆的膨胀有关。

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