Banaba Grégoire, Murer Sébastien, Rousse Céline, Beaumont Fabien, Bliard Christophe, Chatelet Éric, Polidori Guillaume
Interdisciplinary Research on Society-Technology-Environment Interactions (InSyTE), Université de Technologie de Troyes, F-10004 Troyes, France.
Institut de Thermique, Mécanique, Matériaux (ITheMM), Université de Reims Champagne-Ardenne, F-51100 Reims, France.
Materials (Basel). 2025 Jul 17;18(14):3364. doi: 10.3390/ma18143364.
In the context of efforts to reduce greenhouse gas emissions in the building sector, the reintegration of traditional earthen construction into modern architectural and renovation practices offers a sustainable alternative. To address the mechanical and water-resistance limitations of adobe bricks, the use of agricultural waste-such as rice husk-is increasingly being explored. This experimental study evaluates the effects of rice husk addition on the mechanical, hygrothermal, and acoustic properties of adobe bricks. Two soil types-one siliceous and one calcareous-were combined with 1, 2, and 3 wt% rice husk to produce bio-based earthen bricks. The influence of rice husk was found to depend strongly on the soils' mineralogical and granulometric characteristics. The most significant improvements were in hygrothermal performance: at 3 wt%, thermal conductivity was reduced by up to 35% for calcareous soil and 20% for siliceous soil, indicating enhanced insulation. Specific heat capacity also increased with husk content, suggesting better thermal inertia. The moisture buffering capacity, already high in raw soils, is further improved due to increased surface porosity. Mechanically, rice husk incorporation had mixed effects: a modest increase in compressive strength was observed in siliceous soil at 1 wt%, while calcareous soil showed slight improvement at 3 wt%. Acoustic performance remained low across all samples, with minimal gains attributed to limited macro-porosity. These findings highlight the importance of soil composition in optimizing rice husk dosage and suggest promising potential for rice husk-stabilized adobe bricks, especially in thermally demanding environments.
在建筑行业努力减少温室气体排放的背景下，将传统土坯建筑重新融入现代建筑和翻新实践提供了一种可持续的选择。为了解决土坯砖的机械性能和防水性能限制，人们越来越多地探索使用农业废弃物，如稻壳。这项实验研究评估了添加稻壳对土坯砖的机械性能、湿热性能和声学性能的影响。将两种土壤类型（一种硅质土和一种钙质土）与1%、2%和3%（重量）的稻壳混合，制成生物基土砖。研究发现，稻壳的影响在很大程度上取决于土壤的矿物学和粒度特征。最显著的改善在于湿热性能：在3%（重量）时，钙质土的热导率降低了35%，硅质土降低了20%，表明隔热性能增强。比热容也随着稻壳含量的增加而提高，表明热惯性更好。由于表面孔隙率增加，原生土壤中本来就很高的吸湿缓冲能力进一步提高。在机械性能方面，掺入稻壳有不同的效果：在1%（重量）时，硅质土的抗压强度有适度增加，而钙质土在3%（重量）时略有改善。所有样品的声学性能仍然较低，由于宏观孔隙率有限，改善甚微。这些发现突出了土壤成分在优化稻壳用量方面的重要性，并表明稻壳稳定土坯砖具有广阔的潜力，特别是在对热性能要求较高的环境中。
