Mechanical Properties of Hybrid Polypropylene Fiber‑Recycled Tyre Steel Fiber Reinforced UHPC after Exposure to Elevated Temperatures

被引：0
|
作者：
Chen M. [1 ,2 ]
Li A. [1 ]
Zhang T. [1 ]
机构：
[1] School of Resources and Civil Engineering, Northeastern University, Shenyang
[2] Institute for Frontier Technologies of Low‑Carbon Steelmaking, Northeastern University, Shenyang
来源：
Jianzhu Cailiao Xuebao/Journal of Building Materials | 2023年 / 26卷 / 07期
关键词：
elevated temperature; mechanical property; polypropylene fiber; recycled tyre steel fiber; ultra‑high performance concrete;
D O I：
10.3969/j.issn.1007-9629.2023.07.003
中图分类号：
学科分类号：
摘要：
The workability and compressive strength of hybrid polypropylene fiber（PPF）‑recycled tyre steel fiber （RTSF）ultra‑high performance concrete（UHPC）were tested after exposure to elevated temperatures. The results show that the 0.9% volume fraction of PPF can prevent from spalling of UHPC during heating process. The compressive strength increases and then decreases with the increasing temperature，reaching its maximum value after being treated at 400 ℃ ，which is 9.2%-19.9% higher than that after being treated at 20 ℃ . After the same temperature effect，the compressive strength of UHPC decreases with the increases of PPF volume fraction. PPF effectively adheres to the matrix before fiber melting，and can play a bridging role with RTSF. After fiber melting，PPF forms channels in the matrix，improving the high temperature resistance of UHPC. © 2023 Tongji University. All rights reserved.
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页码：716 / 722
页数：6
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