Mechanical and thermal properties of wood fiber reinforced geopolymer composites

ABSTRACT

Geopolymers based on fly ash are an emerging alternative to ordinary Portland cement, with a low impact on the environment and a potential to increase the sustainability of the concrete-based construction. Reported here is the design and investigation of new wood fiber reinforced geopolymer composites (WFRGC) based on fly ash and wood fiber (5–35 wt%). These WFRGC showed reduced mechanical properties with rising wood fiber addition as calculated by compressive strength with the cylindrical test (7.83–59.82 MPa); compressive strength at cubic test (6.95–50.23 MPa); force load at upper yield (0.70–5.02 KN); flexural strength (1.71–11.05 MPa); compressive modulus at cubic test (0.13–054 GPa); and flexural modulus (3.91–1293.61 MPa). The adding of wood fiber showed decreases of the density WFRGC (1.58–1.87 g/cm³) and decreases the thermal conductivity of WFRGC. The addition 20 wt% wood fiber could be the limit for acceptable mechanical properties. WFRGC with 20–35 wt% wood fibers may be a promising green material for building.

摘要

以粉煤灰为基础的地质聚合物是一种新兴的普通硅酸盐水泥替代品，对环境的影响较小，有可能提高混凝土建筑的可持续性. 本文报道了以粉煤灰和木纤维（5～35wt%）为基料的新型木纤维增强地质聚合物复合材料（WFRGC）的设计与研究. 这些WFRGC的力学性能随着木纤维添加量的增加而降低，用柱状抗压强度计算（7.83-59.82MPa）; 立方体抗压强度（6.95-50.23MPa）; 上屈服时的力载荷（0.70-5.02KN）; 抗折强度（1.71-11.05MPa）立方体试验的压缩模量（0.13-054GPa）和弯曲模量（3.91-1293.61MPa）. 木纤维的加入降低了WFRGC的密度（1.58-1.87g/cm3），降低了WFRGC的导热系数. 添加20%的木纤维可作为可接受机械性能的极限. 含20-35%木纤维的WFRGC是一种很有前途的绿色建筑材料.

KEYWORDS:

• Wood fiber
• Fly ash
• Geopolymer composites
• Fiber-reinforced geopolymer composites
• Mechanical properties
• Thermal properties

Keywords:

• 关键词Wood fiber
• 木纤维
• Fly ash
• 粉煤灰
• Geopolymer composites
• 地质聚合物复合材料
• Fiber-reinforced geopolymer composites
• 纤维增强地质聚合物复合材料
• Mechanical properties
• 机械性能
• Thermal properties. 热性能

Declaration of competing interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Additional information

Funding

This work was supported by the ERANET- LAC-FIBER [ERANET- LAC-FIBER 17/2017]; Polish National Centre for Research and Development [LIDER/31/0168/L-10/18/NCBR/2019]; PN III [P2-2.1-PED-2019-3739, no. 565PED/2020].