Preparation and properties of composite cementitious materials containing vanadium-titanium iron ore tailings

Wang Changlong; Ma Jintao; Yang Fenghao; Zhang Gaoqing; Chen Jingliang; Jing Jianlin; Li Xin; Zhai Yuxin; Liu Feng

doi:10.7513/j.issn.1004-7638.2023.01.017

Volume 44 Issue 1

Feb. 2023

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Wang Changlong, Ma Jintao, Yang Fenghao, Zhang Gaoqing, Chen Jingliang, Jing Jianlin, Li Xin, Zhai Yuxin, Liu Feng. Preparation and properties of composite cementitious materials containing vanadium-titanium iron ore tailings[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(1): 98-105. doi: 10.7513/j.issn.1004-7638.2023.01.017

Citation:

Wang Changlong, Ma Jintao, Yang Fenghao, Zhang Gaoqing, Chen Jingliang, Jing Jianlin, Li Xin, Zhai Yuxin, Liu Feng. Preparation and properties of composite cementitious materials containing vanadium-titanium iron ore tailings[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(1): 98-105. doi: 10.7513/j.issn.1004-7638.2023.01.017

Citation:

Wang Changlong, Ma Jintao, Yang Fenghao, Zhang Gaoqing, Chen Jingliang, Jing Jianlin, Li Xin, Zhai Yuxin, Liu Feng. Preparation and properties of composite cementitious materials containing vanadium-titanium iron ore tailings[J]. IRON STEEL VANADIUM TITANIUM, 2023, 44(1): 98-105. doi: 10.7513/j.issn.1004-7638.2023.01.017

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Preparation and properties of composite cementitious materials containing vanadium-titanium iron ore tailings

doi: 10.7513/j.issn.1004-7638.2023.01.017

1.
School of Civil Engineering, Hebei University of Engineering, Handan 056038, Hebei, China
2.
School of Resources and Environmental Engineering , Jiangxi University of Science and Technology, Ganzhou 341000, Jiangxi, China
3.
China Railway Construction Group Co., Ltd., Beijing 100040, China
4.
Construction Development Co., Ltd., China Railway Construction Group, Baoding 074207, Hebei, China

Received Date: 2022-08-31
Publish Date: 2023-02-28

Abstract

Abstract

In order to improve the high-quality and large-scale effective utilization of vanadium-titanium iron ore tailings (VIOTs), composite cementitious materials (CCM) were prepared with VIOTs as the main raw materials. The effects of grinding characteristics of VIOTs, content of VIOTs on the properties of CCM and hydration mechanism of CCM were investigated via means of particle size analysis, mechanical property test, X-ray diffraction (XRD) and scanning electron microscope (SEM). The results show that the specific surface area of VIOTs grinding for 30 minutes reaches 400 m²/kg, and its 28-day activity index is close to 70%. When the content of VIOTs is 27%, the cement-sand ratio is 1∶3 and the water-binder ratio is 0.4, the 3-day and 28-day compressive strength of the CCM are 14.9 MPa and 32.6 MPa respectively, the standard consistency is 32.6%, the initial setting time is 125 min and the final setting time is 396 min. The 14-day shrinkage value of CCM paste is 51.8% lower than that of P·O 42.5 cement paste at the same age. The hydration products of the CCM are mainly C-S-H gel, Ca(OH)₂, Mg(OH)₂ and ettringite (AFt) under standard curing conditions, and the coagulation effect of quartz and diopside particles and hydration products after the hydration reaction of vanadium-titanium iron ore tailings is the guarantee for the strength of the CCM. The hydration of diopside to form Mg(OH)₂ can inhibit the early self-shrinkage of the cementitious system.
- vanadium-titanium iron ore tailings (VIOTs),
- composite cementitious materials (CCM),
- content,
- diopside,
- coagulation effect

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References(32)

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