Eco-friendly treatment of low-calcium coal fly ash for high pozzolanic reactivity: A step towards waste utilization in sustainable building material

被引：200

作者：

Yang, Jin ^{[1
,3
]}

Huang, Jianxiang ^{[1
]}

Su, Ying ^{[1
,3
]}

He, Xingyang ^{[1
,3
]}

Tan, Hongbo ^{[2
]}

Yang, Wei ^{[5
]}

Strnadel, Bohumir ^{[1
,4
]}

机构：

[1] Hubei Univ Technol, Sch Civil Engn Architecture & Environm, 28 Nanli Rd, Wuhan 430068, Hubei, Peoples R China

[2] Wuhan Univ Technol, State Key Lab Silicate Mat Architecture, Wuhan 430070, Hubei, Peoples R China

[3] Hubei Univ Technol, Bldg Waterproof Engn & Technol Res Ctr Hubei Prov, Wuhan 430068, Hubei, Peoples R China

[4] VSB Tech Univ Ostrava, Ctr Adv Innovat Technol, Ostrava 70833, Czech Republic

[5] China Construct Third Bur Ind Investment Co Ltd, Wuhan 430100, Hubei, Peoples R China

来源：

JOURNAL OF CLEANER PRODUCTION | 2019年 / 238卷

关键词：

Wet-milling; Coal fly ash; Pozzolanic reactivity; Industrial solid waste; Cement-based material; BLAST-FURNACE SLAG; MECHANICAL-PROPERTIES; SULFOALUMINATE CEMENT; GRINDING PROCESS; PORTLAND-CEMENT; BY-PRODUCTS; ACTIVATION; HYDRATION; STRENGTH; STABILIZATION/SOLIDIFICATION;

D O I：

10.1016/j.jclepro.2019.117962

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Fly ash is a coal combustion by-product with low pozzolanic reactivity which limits its resource utilization and engineering properties in building materials. The present study investigates a wet-milling treatment to activate the coal fly ash and promote its sustainable utilization. It was found that wet-milling is a suitable, efficient and eco-friendly technology for solid waste refinement. The pozzolanic reactivity is greatly improved after wet-milling treatment, as high as 140% at 60 days with particle size of 2.51 mu m. It was observed that ettringite formation has occurred during the wet-milling. Physical structure, chemical evolution and ion leaching behavior during the wet-milling were discussed. It was proved that activation mechanism of wet-milling is a combined effect of physical breakage and ion dissolution acceleration. Binding energy was found decreased and SiQ(n) structural units were found less polymerized which are helpful for the depolymerization during the pozzolanic reaction. Furthermore, technical applicability of wet-milling for various industrial solid wastes was also investigated. (c) 2019 Elsevier Ltd. All rights reserved.

引用

页数：13

共 67 条

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