Development of a high-temperature inorganic synthetic foam with recycled fly-ash cenospheres for thermal insulation brick manufacturing

JOURNAL OF CLEANER PRODUCTION

卷:246

Article

Brooks, Adam L.¹  Shen, Zhenglai²  Zhou, Hongyu¹ 

[1] Univ Tennessee, Dept Civil & Environm Engn, 851 Neyland Dr, Knoxville, TN 37996 USA

[2] Univ Alabama, Dept Civil & Environm Engn, 5000 Technol Dr, Huntsville, AL 35899 USA

关键词: Fly-ash cenosphere;    Synthetic foam;    Thermal insulation;    Thermal modeling;   

DOI  :  10.1016/j.jclepro.2019.118748

来源: Elsevier

【 摘 要 】

In this study, a novel inorganic synthetic solid foam composed of recycled fly-ash cenospheres (FACs) is developed with low-density, good thermal insulation performance, and reasonable mechanical strength. The manufacturing process utilizes low-fraction clay binder materials diluted in water, enabling a self-assembling mechanism assisted by natural capillary effect to form minimal contacts among the FACs. The microstructure and minimal contact formation were confirmed by optical and electron microscope imaging. Both thermal and mechanical properties of the fly-ash cenosphere synthetic solid foam (FAC-SSF) materials were experimentally studied as functions of key material parameters including cenosphere particle size and clay content. A numerical model was developed to predict the effective thermal conductivity of FAC-SSF using a three-step homogenization method which takes into account different thermal percolation paths within the material. The inorganic synthetic foam developed has the potential for thermal insulation applications taking advantage of their relatively simple, low-cost, and scalable manufacturing process, minimal use of binder materials, and relatively high mechanical strength and highly tailorable properties. (C) 2019 Elsevier Ltd. All rights reserved.

【 授权许可】

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