Analysis of the strength mechanism of lime-base activated titanium gypsum composite cementitious material

Yang He

doi:10.7513/j.issn.1004-7638.2021.03.017

Volume 42 Issue 3

Jun. 2021

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Yang He. Analysis of the strength mechanism of lime-base activated titanium gypsum composite cementitious material[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 111-118. doi: 10.7513/j.issn.1004-7638.2021.03.017

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Yang He. Analysis of the strength mechanism of lime-base activated titanium gypsum composite cementitious material[J]. IRON STEEL VANADIUM TITANIUM, 2021, 42(3): 111-118. doi: 10.7513/j.issn.1004-7638.2021.03.017

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Analysis of the strength mechanism of lime-base activated titanium gypsum composite cementitious material

doi: 10.7513/j.issn.1004-7638.2021.03.017

Yang He^{1, 2
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1.
China Railway Tunnel Stock Co., Ltd., Zhengzhou 450001, Henan, China
2.
School of Civil Engineering, Architecture and Environment, Xihua University, Chengdu 610039, Sichuan, China

Received Date: 2020-10-10
Publish Date: 2021-06-10

Abstract

Abstract

Titanium gypsum, flue gas desulphurization gypsum and titanium slag are used as main raw materials of titanium industrial solid wastes, and lime is used as an alkaline activator to make titanium gypsum composite cementing materials. Orthogonal experiments, combined with XRD, SEM and other analytical testing methods, are used to analyze the strength mechanism of lime-base activated titanium gypsum composite cementing materials. The experimental results show that the content of titanium gypsum is between 42.9% and 50.3%, which can produce a titanium gypsum composite cementing material with strength of 2.0 in “Building Gypsum” (GB/T 9776—2008). The initial strength contribution of the lime-based titanium gypsum composite cementing material mainly comes from the dihydrate gypsum produced by the hydration of titanium gypsum and flue gas desulphurization gypsum, and the later strength contribution mainly comes from the further reaction of cement, lime and gypsum to produce ettringite. The hydration mechanism is as follows: First, CaSO₄·0.5H₂O hydrates to produce CaSO₄·2H₂O; Second, the 3CaO·Al₂O₃ in the cement reacts with CaSO₄·2H₂O to produce ettringite, the lime reacts with water to produce Ca(OH)₂, and the combination of CaSO₄·2H₂O and CaO·Al₂O₃ react to produce ettringite. Therefore, the strength of the titanium gypsum composite cementitious material is further improved.
- titanium gypsum,
- FGD,
- titanium slag powder,
- titanium industrial solid waste,
- composite cementitious material,
- strength mechanism

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References(18)

References

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