废旧纤维在水泥基材料中的应用研究进展

doi:10.11896/cldb.19070105

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Abstract Fiber reinforced composites (FRC) are widely used in modern industrial production due to their high strength, light weight and corrosion resistance. Their design service life is about 20—25 years. With the arrival of their design service life, a substantial amount of FRC will be decommissioned.
Only in the field of wind power generation, the total waste of this material will reach 43.4 million t by 2050. Waste FRC have a great impact on the environment. How to dispose those fiber composites waste is an argue problem to be solved.
Currently, there are three methods to recycle FRC: mechanical recycling, thermal processes, and chemical processes. Mechanical recycling refers to the use of a crusher to pulverize the recycled FRC into chips or fragments with different particle sizes. This recovery process is simple, efficient and without pollutant emission, but it will destroy the original morphology of fiber and reduces the performance of recycled fiber. Meanwhile, the resin attached to the fiber surface is not removed, which affects the reuse of the recovered fiber. Thermal processes uses high tempe-rature or oxidizing condition to oxidize or pyrolyze the resin attached to the surface of recycled fiber in order to remove the resin and recover the fiber. This method did not degrade the performance of recycled fiber, and the performance of recycled fiber is close to that of the virgin fiber. However, the thermal process consumes a lot of energy, and this heat treatment will produce toxic and harmful gases. Chemical recovery me-thods include supercritical technology and reagent method. The supercritical technology requires expensive special equipments and complex process, so it’s only suitable for small-scale laboratory use. Reagent method is the use of chemical reagents to weaken the adhesive property between recycled fiber and resin, which has the advantages of simple process and high efficiency. Combined with mechanical recycling, it is very suitable for recycling a large number of wastes FRC materials.
The recycle FRC are properly treated, before its use in cementitious mortar, which can not only realize the reuse of waste resources, but also improve the performance of cement-based materials. The enhancement mechanism of recycled fibers on cement-based materials is mainly as follows: (1) inhibition of the generation of initial microcracks during cement setting and hardening; (2) controlling the propagation and consolidation of micro-cracks in handened cement-based materials under loading; (3) absorbing energy in the process of failure to improve the toughness of cement-based materials.
In this paper, the advantages and disadvantages of various methods are expounded based on the current research status of recycling fibers at home and abroad. At the same time, the effects of recycled steel fiber, recycled carbon fiber, recycled plastic fiber and other types of fiber on the performance of cement-based materials are introduced emphatically, and their development prospects are prospected.

Key words： fibrous composite waste fiber recovery method cement-based materials

Published: 24 December 2020

CLC number:

TU528

Fund:This work was financially supported by the National Natural Science Foundation of China (51878549, 51590914), General Project of Natural Science Foundation of Shaanxi Province (2020JM-469).

About author:: Shaohui Zhang, received his B.S. degree from College of Materials Science and Engineering, Xi’an University of Architecture and Technology in 2017. He is currently a master-docter combined program graduate student in College of Civil Engineering, Xi’an University of Architecture and Technology under the supervision of Prof. Ditao Niu and associate professor Yan Wang. His research has focused on fiber and recycled fiber concrete and durability of tunnel concrete lining structure.
Yan Wang, doctor of engineering, associate professor of the college of materials science and engineering, Xi’an University of Architecture and Technology, member of State Key Laboratory of Green Building in Wes-tern China. Her research has focused on fiber concrete and durability of concrete and concrete structure. More than 30 articles have been published in journal articles,including 11 journal articles are retrieved by SCI. As the project leader or main accomplisher, she has completed 2 National Natural Science Foundation project, a number of Shaanxi Natural Science Foundation projects, and participated in 4 national scientific research projects. She also participated in the compilation of 1 national standard.
Ditao Niu, doctor of engineering, national grade two professor and distinguish professor of Xi’an University of Architecture and Technology. Winner of the National Science Fund for Distinguished Young Scholars, the leader talent of the national Million People Plan and the national candidate talents for New Century Talents Project. He is also the modern concrete structure safety and durability, of the Ministry of Education, and enjoy the special allowance of the State Council Government. He was selected as the top talent in the key areas of Shaanxi Province, the leader talent of the national Million People Plan and the national candidate talents for New Century Talents Project. He serves as the director of the engineering quality branch of the China Civil Engineering Society, the deputy director of the village disaster prevention Committee of the China Construction Society, deputy director of ACI (China branch). The main research interest of his team include durability of engineering structure and its countermeasures, reliability evaluation and reinforcement of existing structures, new materials and new structural systems.

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Cite this article:

ZHANG Shaohui,WANG Yan,NIU Ditao. Research Progress of the Application of Waste Fiber in Cement-based Materials[J]. Materials Reports, 2020, 34(23): 23042-23050.

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http://www.mater-rep.com/EN/10.11896/cldb.19070105 OR http://www.mater-rep.com/EN/Y2020/V34/I23/23042

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