Preparation technology and mechanism of cementitious material based on solid waste phosphogypsum

ZHENG Yulong; JI Shuai; LU Chunhua; SUN Yutao; ZHAO Hang

doi:10.13801/j.cnki.fhclxb.20230731.001

Volume 41 Issue 3

Mar. 2024

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ZHENG Yulong, JI Shuai, LU Chunhua, et al. Preparation technology and mechanism of cementitious material based on solid waste phosphogypsum[J]. Acta Materiae Compositae Sinica, 2024, 41(3): 1436-1446. doi: 10.13801/j.cnki.fhclxb.20230731.001

Citation:

ZHENG Yulong, JI Shuai, LU Chunhua, et al. Preparation technology and mechanism of cementitious material based on solid waste phosphogypsum[J]. Acta Materiae Compositae Sinica, 2024, 41(3): 1436-1446. doi: 10.13801/j.cnki.fhclxb.20230731.001

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Preparation technology and mechanism of cementitious material based on solid waste phosphogypsum

doi: 10.13801/j.cnki.fhclxb.20230731.001

1.
Faculty of Civil Engineering Mechanics, Jiangsu University, Zhenjiang 212013, China
2.
Danyang Jiling Jiagu New Building Materials CO., LTD., Zhenjiang 212300, China

Funds: National Natural Science Foundation of China (52108147; 51878319); Jiangsu Planned Projects for Postdoctoral Research Funds (2020Z350); Senior Talent Foundation of Jiangsu University (20JDG19)

Received Date: 2023-05-25
Accepted Date: 2023-07-14
Rev Recd Date: 2023-06-29

Available Online: 2023-07-31

Publish Date: 2024-03-01

Abstract

Abstract

A large amount of industrial solid waste phosphogypsum has caused serious pollution to the environment. At the same time, the contradiction between the traditional cement industry with high energy consumption and the realization of the "double carbon" target has become increasingly prominent. Some studies have shown that the cementitious material based on phosphogypsum can replace part of ordinary Portland cement, but its working and mechanical properties are poor when using raw materials without treatment. In this paper, the green and high strength phosphogypsum based cementitious materials were prepared by using common industrial solid wastes such as original phosphogypsum, slag, steel slag and limestone. The results show that chelates are formed by mixing 0.5wt% plant protein with Ca²⁺ in the gelling system to produce a coordination compound covering the surface of gypsum nucleus, which not only delays the setting time of the gelling material, promotes the hydration reaction degree, but also improves its mechanical properties. The microstructure and composition analysis show that phosphogypsum is mainly used as a filler in the cementitious material, the slag is activated by the alkali of steel slag, and the limestone promotes the hydration reaction while providing Ca²⁺. Based on the original solid waste phosphogypsum, using the mixture ratio of m_{phosphogypsum}∶m_slag∶m_{steel slag}∶m_limestone = 0.45∶0.35∶0.1∶0.1, 28 days flexural strength of mortar specimen is 7.0 MPa, compressive strength is 39.1 MPa, and softening coefficient is 0.91, which is very close to the performance of P·O 42.5 grade ordinary Portland cement.
- solid waste phosphogypsum,
- cementitious material,
- plant protein,
- mechanical properties,
- setting and hardening mechanism
Long Abstrsct
Innovation Points

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References(38)

References

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