Research Progress of the Application of Waste Fiber in Cement-based Materials
ZHANG Shaohui1, WANG Yan2,3, NIU Ditao1,3
1 College of Civil Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 2 College of Materials Science and Engineering, Xi’an University of Architecture and Technology, Xi’an 710055, China 3 State Key Laboratory of Green Building in Western China, Xi’an University of Architecture and Technology, Xi’an 710055, China
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.
张少辉, 王艳, 牛荻涛. 废旧纤维在水泥基材料中的应用研究进展[J]. 材料导报, 2020, 34(23): 23042-23050.
ZHANG Shaohui, WANG Yan, NIU Ditao. Research Progress of the Application of Waste Fiber in Cement-based Materials. Materials Reports, 2020, 34(23): 23042-23050.
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2020, Vol. 34 
