Cheng Tonggui, Xiong Chengfeng, Zhou Caihong, Li Zhenyang, Zhang Xinli
College of Materials Science and Engineering, Central South University of Forestry and Technology, Changsha 410004, P. R. China.
ACS Omega. 2024 Oct 15;9(43):43766-43778. doi: 10.1021/acsomega.4c06416. eCollection 2024 Oct 29.
This study investigated the properties of fly ash-based geopolymers containing waste glass powder (WGP) and bamboo fiber (BF) after exposure to ambient and high temperatures. Precursor replacement of fly ash by WGP at 2.5, 5, 7.5, and 10% levels coupled with the addition of BF at 1, 1.5, 2, and 2.5% levels was used to enhance the reactivity and toughness of the geopolymer matrix. The impact of WGP and BF on the fluidity, setting time, density, water absorption, and compressive and flexural strengths of the geopolymer pastes was examined. The experimental results showed that the physical properties of the geopolymer were altered by adding WGP and BF. The optimal percentages of WGP replacement and BF addition were 5 and 2%, respectively. Additionally, tests such as thermogravimetric analysis, mass loss, thermal shrinkage, compressive and flexural tests, visual observation, optical microscope, scanning electron microscopy, and X-ray diffraction analysis were conducted to assess the behavior of the geopolymers after exposure to high temperatures (200-800 °C). Addition of WGP and BF led to higher residual strengths, demonstrating that the geopolymer composites tended to gradually densify with increasing temperature due to the pore-filling effects of WGP and the channel effects of BF, while the pure geopolymer continuously developed more cracks and wider pores. The study provides a viable approach for using solid waste materials and renewable resources in the production of high-performance geopolymer composites as sustainable building materials.
本研究调查了含有废玻璃粉（WGP）和竹纤维（BF）的粉煤灰基地质聚合物在暴露于环境温度和高温后的性能。采用2.5%、5%、7.5%和10%水平的WGP替代粉煤灰，并添加1%、1.5%、2%和2.5%水平的BF，以提高地质聚合物基体的反应活性和韧性。研究了WGP和BF对地质聚合物浆料的流动性、凝结时间、密度、吸水率以及抗压强度和抗折强度的影响。实验结果表明，添加WGP和BF会改变地质聚合物的物理性能。WGP替代和BF添加的最佳百分比分别为5%和2%。此外，还进行了热重分析、质量损失、热收缩、抗压和抗折试验、目视观察、光学显微镜、扫描电子显微镜和X射线衍射分析等测试，以评估地质聚合物在暴露于高温（200-800°C）后的性能。添加WGP和BF导致更高的残余强度，表明由于WGP的孔隙填充效应和BF的通道效应，地质聚合物复合材料倾向于随着温度升高而逐渐致密化，而纯地质聚合物则不断产生更多裂缝和更宽的孔隙。该研究为在高性能地质聚合物复合材料生产中使用固体废料和可再生资源作为可持续建筑材料提供了一种可行的方法。
