Utilization of Municipal Solid Waste Incineration Fly Ash for Non-Bearing Masonry Units Containing Coconut Fiber

ABSTRACT

This research investigated the properties of coconut fiber (CF) reinforced lateritic soil (LS) mixed with municipal solid waste incineration fly ash (MSWI FA) based geopolymer as a green construction material. The MSWI FA was a by-product of the municipal solid waste burning process to generate electricity. The influence factors studied included LS/MSWI FA ratio, CF content, sodium silicate (Na₂SiO₃)/sodium hydroxide (NaOH) ratio, and NaOH concentration. The unconfined compressive strength (UCS), flexural strength (FS), and microstructure analysis were evaluated. The maximum dry unit weight of specimens increased as the LS/MSWI FA ratio and NaOH concentration increased due to the higher specific gravity of LS and the higher concentration of NaOH. The optimum ingredient mixture for the specimen was found at an LS/MSWI FA ratio of 1/1, an Na₂SiO₃/NaOH ratio of 80/20, an NaOH concentration of 5 molar, and a CF content of 0.5%, which meets the 7-day UCS requirement for non-bearing masonry units and offers the highest FS. The specimen containing CF developed a denser matrix compared to the sample without CF because the addition of CF content promotes a geopolymerization reaction. The P-values of independent parameters were less than 0.05, indicating statistical significance at the 95% confidence level.

摘要

本研究调查了椰子纤维(CF)增强红土(LS)与城市垃圾焚烧飞灰(MSWI-FA)基地质聚合物混合作为绿色建筑材料的性能. MSWI FA是城市固体废物燃烧发电过程的副产品. 研究的影响因素包括LS/MSWI FA比、CF含量、硅酸钠(Na2SiO3)/氢氧化钠(NaOH)比和NaOH浓度. 评估了无侧限抗压强度(UCS)、弯曲强度(FS)和微观结构分析. 试样的最大干容重随着LS/MSWI FA比和NaOH浓度的增加而增加,这是由于LS的比重和NaOH的浓度较高. 在LS/MSWI FA比为1/1、Na2SiO3/NaOH比为80/20、NaOH浓度为5摩尔、CF含量为0.5%的情况下,找到了试样的最佳成分混合物,该混合物满足非承重砌块的7天UCS要求,并提供了最高的FS. 与不含CF的样品相比,含有CF的样品形成了更致密的基质,因为CF含量的添加促进了地质聚合反应. 独立参数的P值小于0.05,表明在95%置信水平下具有统计学意义.

KEYWORDS:

• Lateritic soil
• unconfined compressive strength
• flexural strength
• statistical significance
• construction material
• microstructural analysis

关键词:

• 红壤
• 无侧限抗压强度
• 抗弯强度
• 统计学意义
• 建筑材料
• 微观结构分析

Acknowledgments

The second author would like to acknowledge the support of the Rajamangala University of Technology Isan.

Disclosure statement

No potential conflict of interest was reported by the author(s).

Additional information

Funding

This research project is supported by Thailand Science Research and Innovation via Rajamangala University of Technology Srivijaya Contract 63A171000023.