基于分形理论研究RTSF混凝土冲击压缩性能

doi:10.12068/j.issn.1005-3026.2022.02.016

东北大学学报（自然科学版） ›› 2022, Vol. 43 ›› Issue (2): 266-273.DOI: 10.12068/j.issn.1005-3026.2022.02.016

基于分形理论研究RTSF混凝土冲击压缩性能

陈猛¹，王瑜婷¹，陶云霄¹，王浩²

(1. 东北大学资源与土木工程学院，辽宁沈阳110819； 2. 中国水利水电科学研究院水资源研究所，北京100038)

修回日期:2021-01-25 接受日期:2021-01-25 发布日期:2022-02-28
通讯作者: 陈猛
作者简介:陈猛(1981-)，男，辽宁铁岭人，东北大学副教授；王浩(1953-)，男，北京人，中国水利水电科学研究院教授级高级工程师，中国工程院院士.
基金资助:
辽宁省自然科学基金资助项目(2020-MS-089)；中央高校基本科研业务费专项资金资助项目(N2001005).

Impact Compression Properties of Recycled Tyre Steel Fiber Reinforced Concrete Based on Fractal Theory

CHEN Meng¹， WANG Yu-ting¹， TAO Yun-xiao¹， WANG Hao²

1. School of Resources & Civil Engineering， Northeastern University， Shenyang 110819， China; 2. Department of Water Resources， China Institute of Water Resources and Hydropower Research， Beijing 100038， China.

Revised:2021-01-25 Accepted:2021-01-25 Published:2022-02-28
Contact: CHEN Meng
About author:-
Supported by:
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摘要/Abstract

摘要： 为了研究回收轮胎钢纤维(RTSF)混凝土的冲击压缩性能，利用分离式霍普金森压杆对普通混凝土(F0)、工业钢纤维(ISF)混凝土和RTSF混凝土进行冲击压缩试验，统计冲击破坏后的碎块数量并计算分形维数.结果表明:RTSF混凝土冲击破坏形态分为三种类型，即周边张应变破坏、留芯破坏和整体破坏；应变率在55~125s^-1左右时，不同掺量RTSF混凝土的分形维数范围为1.33~2.25；分形维数随RTSF掺量增加出现先减小后增大的趋势，RTSF 0.75混凝土分形维数最小；不同掺量的RTSF混凝土的分形维数随应变率增加而增大；不同应变率下RTSF混凝土的动态抗压强度及断裂能均随分形维数的增加而增大；ISF 1.00的分形维数、动态抗压强度和断裂能均介于RTSF0.75和RTSF1.00之间，RTSF 0.75比ISF 1.00(纤维长度为35mm，长径比为65)能更有效提高混凝土的冲击压缩性能.

关键词: 纤维混凝土；回收轮胎钢纤维；分离式霍普金森压杆；分形维数；冲击压缩

Abstract: In order to study the impact compression properties of recycled tire steel fiber(RTSF) reinforced concrete， the impact compression tests of general concrete(F 0)， industrial steel fiber(ISF)reinforced concrete and RTSF reinforced concrete were carried out by using split Hopkinson pressure bar. The crushed specimens were sieved and fractal dimensions were calculated. The results indicate that the impact failure modes of RTSF reinforced concrete can be divided into three types: peripheral tensile strain failure， core retaining failure and overall failure. The fractal dimension of RTSF reinforced concrete ranges between 1.33 and 2.25 under strain rates of 55 to 125s^-1. The fractal dimension decreases and then increases with the increase of RTSF content. The fractal dimension of RTSF 0.75 reinforced concrete is minimal. The fractal dimension of concrete reinforced with various fiber contents increases with the increase of strain rates. Under different strain rates， the dynamic compressive strength and fracture energy of RTSF reinforced concrete enhance with the increase of fractal dimension. The fractal dimension， dynamic compressive strength and fracture energy of concrete reinforced with ISF 1.00 are between those of concrete reinforced with RTSF 0.75 and RTSF 1.00.In terms of impact compression， RTSF 0.75 outperforms ISF 1.00 (the fiber length is 35mm and the aspect ratio is 65).

Key words: fiber reinforced concrete; recycled tyre steel fiber; split Hopkinson pressure bar; fractal dimension; impact compression

中图分类号:

TU528.572

陈猛，王瑜婷，陶云霄，王浩. 基于分形理论研究RTSF混凝土冲击压缩性能[J]. 东北大学学报（自然科学版）, 2022, 43(2): 266-273.

CHEN Meng， WANG Yu-ting， TAO Yun-xiao， WANG Hao. Impact Compression Properties of Recycled Tyre Steel Fiber Reinforced Concrete Based on Fractal Theory[J]. Journal of Northeastern University(Natural Science), 2022, 43(2): 266-273.

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基于分形理论研究RTSF混凝土冲击压缩性能

Impact Compression Properties of Recycled Tyre Steel Fiber Reinforced Concrete Based on Fractal Theory

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