Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 353, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.129100
Keywords
Iron ore tailings; High -volume; Ultra -fine treatment; Cementitious materials; Hydration mechanism
Categories
Funding
- Natural Science Foundation of Fujian Province, China [2022J011195]
- Natural Science Foundation of Nanping of China [N2021J002]
- Guangdong Basic and Applied Basic Research Foundation, China [2020A1515110304]
- Guangzhou Science and Technology Plan, China [202102020224]
- Teachers and Students Co-construction Team of Wuyi University, China [2021-SSTD-04]
- Young and Middle-aged Teacher Education Research Project of Fujian Province, China [JAT210456]
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Iron ore tailings (IOT) are a type of mining waste that can cause environmental and safety issues. This study investigates the effect of high-volume ultra-fine IOT on the mechanical properties and hydration mechanism of cementitious materials. The results show that the ultra-fine treatment enhances the hydration activity of IOT particles and improves the mechanical properties of cementitious materials.
Iron ore tailings (IOT) are a type of mining solid waste and cause many environmental and safety problems. The aim of this paper was to investigate the effect of high-volume ultra-fine IOT on the mechanical properties and hydration mechanism of cementitious materials. To obtain ultra-fine particles, IOT was processed via grinding in water, and the particle characteristics were characterized using a laser particle-size analyzer, scanning electron microscope (SEM), Fourier transform infrared spectroscopy (FT-IR) and inductively coupled plasma (ICP). The influence of the IOT particle size (D50 = 47.63 mu m, 4.32 mu m, 1.09 mu m), substitution percentage (30 %, 40 %, 50 %), and hydration age (1 d, 7 d, 28 d) on the compressive strength of mortar specimens were also studied. The results show that ultra-fine treatment enhances the hydration activity of IOT particles and has a positive effect on the mechanical properties of cementitious materials. The addition of IOT increases the setting time and reduces the hydration heat at early hydration stage; however, the ultra-fine treatment can minimize this problem and meet the requirements of practical engineering applications. Compared with raw IOT, the ultra-fine IOT exhibits more remarkable filling effect and hydration activity. They can consume a large amount of portlandite, which is produced by cement hydration to form densified calcium silicate hydrate gel and accelerate the development of strength. This study provides a design method and experimental data support for the preparation of a kind of low-carbon cementitious materials.
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