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含再生和工业钢纤维的超高性能混凝土的力学性能及抗剥落性能

Mechanical Properties and Anti-Spalling Behavior of Ultra-High Performance Concrete with Recycled and Industrial Steel Fibers.

作者信息

Yang Juan, Peng Gai-Fei, Shui Guo-Shuang, Zhang Gui

机构信息

Faculty of Civil Engineering, Beijing Jiaotong University, Beijing 100044, China.

出版信息

Materials (Basel). 2019 Mar 7;12(5):783. doi: 10.3390/ma12050783.

DOI:10.3390/ma12050783
PMID:30866450
原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC6427116/
Abstract

Experimental investigations on the mechanical properties of ultra-high performance concrete (UHPC) incorporating two types of recycled steel fiber processed from waste tires and three types of industrial steel fiber were carried out for comparison. Mechanical properties of UHPC include compressive strength, splitting tensile strength, fracture energy, and elastic modulus. Their explosive spalling behaviors under high temperatures were also investigated. The results show that all types of steel fiber exhibit a beneficial effect on the mechanical properties and the anti-spalling behavior of UHPC, except that recycled steel fiber with rubber attached (RSFR) has a slightly negative effect on the compressive strength of UHPC. Compared to industrial steel fibers, recycled steel fibers have a more significant influence on improving the splitting tensile strength and fracture energy of UHPC, and the improvement of RSFR was much higher than that of recycled steel fiber without rubber (RSF). UHPC that incorporates industrial hooked-end steel fiber (35 mm in length and 0.55 mm in diameter) exhibits the best resistance to explosive spalling, and the second is the RSF reinforced UHPC. The positive relationship between the fracture energy and the anti-spalling behavior of steel fiber reinforced UHPC can be presented. These results suggest that recycled steel fiber can be a toughening material and substitute for industrial steel fibers to be used in ultra-high performance concrete, especially RSFR.

摘要

开展了关于掺入两种由废旧轮胎加工而成的再生钢纤维和三种工业钢纤维的超高性能混凝土（UHPC）力学性能的试验研究，以作比较。UHPC的力学性能包括抗压强度、劈裂抗拉强度、断裂能和弹性模量。还研究了它们在高温下的爆炸剥落行为。结果表明，除附着橡胶的再生钢纤维（RSFR）对UHPC的抗压强度有轻微负面影响外，所有类型的钢纤维对UHPC的力学性能和抗剥落行为均有有益影响。与工业钢纤维相比，再生钢纤维对提高UHPC的劈裂抗拉强度和断裂能有更显著的影响，且RSFR的改善程度远高于无橡胶的再生钢纤维（RSF）。掺入工业钩端钢纤维（长度35毫米，直径0.55毫米）的UHPC表现出最佳的抗爆炸剥落性能，其次是RSF增强的UHPC。可以呈现钢纤维增强UHPC的断裂能与抗剥落行为之间的正相关关系。这些结果表明，再生钢纤维可以作为一种增韧材料，替代工业钢纤维用于超高性能混凝土，尤其是RSFR。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5318/6427116/8711252a0b58/materials-12-00783-g014.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5318/6427116/8e675a3ca774/materials-12-00783-g003.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5318/6427116/ea3e234f6a05/materials-12-00783-g005.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5318/6427116/27c2b926114c/materials-12-00783-g006.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5318/6427116/148239f4b8b1/materials-12-00783-g007.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5318/6427116/bd3c51524422/materials-12-00783-g008.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5318/6427116/01a82b930a49/materials-12-00783-g009.jpg
https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5318/6427116/0bec23689e54/materials-12-00783-g010.jpg
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https://cdn.ncbi.nlm.nih.gov/pmc/blobs/5318/6427116/8711252a0b58/materials-12-00783-g014.jpg

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Polymers (Basel). 2018 Mar 24;10(4):361. doi: 10.3390/polym10040361.
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