Cervilla-Maldonado Ana, Valverde-Palacios Ignacio, Martín-Villegas Francisco, Fuentes-García Raquel
Department of Building Construction, Technical Upper School of Architecture, University of Granada, Campo del Principe, E18071 Granada, Spain.
Materials (Basel). 2024 Dec 14;17(24):6118. doi: 10.3390/ma17246118.
Modern construction is largely dependent on steel and concrete, with natural materials such as earth being significantly underutilised. Despite its sustainability and accessibility, earth is not being used to its full potential in developed countries. This study explores innovative building materials using Alhambra Formation soil (Granada, Spain) reinforced with difficult-to-recycle agricultural waste: polypropylene fibres contaminated with organic matter and leachates. Fibres were added at a ratio between 0.20 and 0.80% of the soil mass, leachates at a ratio between 4.25 and 8.50%, and lime was incorporated at 2.00% and 4.00% for specimens with higher residue content. Physico-mechanical properties, including uniaxial compressive strength and longitudinal strain, were analysed together with the microstructure. The results showed that polypropylene fibres, in comparison to the use of leachates, improved compressive strength and ductility, reaching a compressive strength of 1.76 MPa with a fibre content of 0.40%. On the other hand, this value is 7.4% lower than the reference sample without additives. The fibre-reinforced samples showed a higher porosity compared to the samples with leachates or without additives. This approach highlights the potential of agricultural waste for the development of sustainable construction materials, offering enhancements in the strength and ductility of reinforced soils.
现代建筑在很大程度上依赖于钢铁和混凝土，而诸如泥土等天然材料的利用率则极低。尽管泥土具有可持续性且易于获取，但在发达国家，它并未得到充分利用。本研究探索了一种创新型建筑材料，该材料使用阿尔罕布拉组土壤（西班牙格拉纳达），并用难以回收的农业废弃物进行增强：被有机物和渗滤液污染的聚丙烯纤维。纤维的添加比例为土壤质量的0.20%至0.80%，渗滤液的添加比例为4.25%至8.50%，对于残留量较高的试样，石灰的添加量为2.00%和4.00%。对包括单轴抗压强度和纵向应变在内的物理力学性能以及微观结构进行了分析。结果表明，与使用渗滤液相比，聚丙烯纤维提高了抗压强度和延展性，纤维含量为0.40%时，抗压强度达到1.76兆帕。另一方面，该值比未添加添加剂的参考样品低7.4%。与含有渗滤液或未添加添加剂的样品相比，纤维增强样品显示出更高的孔隙率。这种方法突出了农业废弃物在开发可持续建筑材料方面的潜力，增强了加筋土的强度和延展性。
