Hussein Nasreddine , Nicolas Dujardin , Assia Djerbi , Thouraya Salem , Laurent Gautron
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引用次数: 0
摘要
本文研究了将大麻叶(HS)纤维掺入偏高岭土(MK)、燃煤粉煤灰(FA1)和生物质粉煤灰(FA2)配制的地聚合物复合材料中,对其热性能和力学性能的影响。HS含量变化(0,200,250,300和350 wt%的粘合剂),以评估其对干密度,孔隙率,导热性和微观结构的影响。结果表明,HS含量的增加会显著增加孔隙率,导致所有粘结剂类型的密度和导热系数降低。在350 wt% HS下,fa2基复合材料的孔隙率最高(68.6%),导热系数最低(0.068 W.m−1. k−1),增强了其保温应用的适用性。扫描电镜分析显示,大量的界面空隙和裂缝,特别是在fa基复合材料中,有助于提高绝缘性能,但降低抗压强度。在高纤维含量的复合材料中观察到不完全地聚合,这可能是由于活化剂溶液被HS纤维吸收,从而影响了基体的凝聚力。尽管结构发生了这些变化,但所有复合材料仍然符合NF EN 998-1标准,用于渲染和抹灰砂浆,其中fa2基复合材料显示出最大的隔热应用潜力,有助于建筑的可持续性。
Impact of hemp shiv content and binder type on the thermal and mechanical properties of geopolymer composites
This study investigates the impact of incorporating hemp shiv (HS) fibers into geopolymer composites formulated with metakaolin (MK), coal combustion fly ash (FA1), and biomass fly ash (FA2) on their thermal and mechanical properties. HS content was varied (0, 200, 250, 300, and 350 wt% of the binder) to assess its effect on dry density, porosity, thermal conductivity, and microstructure. Results show that increasing HS content significantly increased porosity, leading to reduced density and thermal conductivity across all binder types. FA2-based composites exhibited the highest porosity (68.6%) and the lowest thermal conductivity (0.068 W.m−1.K−1) at 350 wt% HS, reinforcing their suitability for thermal insulation applications. SEM analysis revealed substantial interfacial voids and cracking, particularly in FA-based composites, contributing to enhanced insulation properties but reducing compressive strength. Incomplete geopolymerization was observed in high-fiber-content composites, likely due to the absorption of activator solution by HS fibers, which affected matrix cohesion. Despite these structural changes, all composites remained within NF EN 998–1 standards for rendering and plastering mortars, with FA2-based composites demonstrating the greatest potential for thermal insulation applications, contributing to sustainability in construction.
期刊介绍:
Construction and Building Materials offers an international platform for sharing innovative and original research and development in the realm of construction and building materials, along with their practical applications in new projects and repair practices. The journal publishes a diverse array of pioneering research and application papers, detailing laboratory investigations and, to a limited extent, numerical analyses or reports on full-scale projects. Multi-part papers are discouraged.
Additionally, Construction and Building Materials features comprehensive case studies and insightful review articles that contribute to new insights in the field. Our focus is on papers related to construction materials, excluding those on structural engineering, geotechnics, and unbound highway layers. Covered materials and technologies encompass cement, concrete reinforcement, bricks and mortars, additives, corrosion technology, ceramics, timber, steel, polymers, glass fibers, recycled materials, bamboo, rammed earth, non-conventional building materials, bituminous materials, and applications in railway materials.