聚丙烯-钢纤维混凝土蠕变特性的温度-荷载耦合效应

俎琪, 肖东, 彭德坤, 王育康, 黄锐

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塑料科技 ›› 2025, Vol. 53 ›› Issue (03) : 71-76. DOI: 10.15925/j.cnki.issn1005-3360.2025.03.013
加工与应用

聚丙烯-钢纤维混凝土蠕变特性的温度-荷载耦合效应

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Temperature-load Coupling Effect on Creep Characteristics of Polypropylene Steel Fiber Reinforced Concrete

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摘要

为研究温度-荷载耦合下混杂纤维混凝土蠕变行为,开展钢纤维和聚丙烯纤维混凝土在20~800 ℃的压缩蠕变试验。测试变量包括温度、荷载水平、加热速率、混凝土强度和混凝土中是否掺入纤维。结果表明:瞬态蠕变应变(ε trc)在总应变中的占比较大。温度范围和应力水平对ε trc有显著影响,特别是在温度高于500 ℃和应力水平高于40%时;目标温度一定,ε trc总量一定,加热速率与瞬态蠕变增长速率呈正相关关系;在普通强度混凝土中掺入钢纤维能够小幅降低混凝土的ε trc,而在高强混凝土中加入聚丙烯纤维可显著提高混凝土ε trc

Abstract

To investigate the creep behavior of hybrid fiber-reinforced concrete under coupled temperature and load conditions, compression creep tests were conducted on steel fiber and polypropylene fiber-reinforced concrete at temperatures ranging from 20 °C to 800 °C. The test variables included temperature, load level, heating rate, concrete strength, and the presence of fibers in the concrete. The results showed that transient creep strain (ε trc) accounted for a significant proportion of the total strain. The temperature range and stress level had a significant impact on ε trc, especially at temperatures above 500 °C and stress levels above 40%. When the target temperature was constant and the total ε trc was fixed, the heating rate was positively correlated with the rate of ε trc increase. Adding steel fibers to normal-strength concrete could slightly reduce the ε trc of the concrete, while incorporating polypropylene fibers into high-strength concrete significantly increased the ε trc.

关键词

蠕变应变 / 热力耦合 / 耐火性 / 钢纤维 / 聚丙烯纤维

Key words

Creep strain / Thermal coupling / Fire resistance / Steel fibers / Polypropylene fibers

中图分类号

U213.1

引用本文

导出引用
俎琪 , 肖东 , 彭德坤 , . 聚丙烯-钢纤维混凝土蠕变特性的温度-荷载耦合效应. 塑料科技. 2025, 53(03): 71-76 https://doi.org/10.15925/j.cnki.issn1005-3360.2025.03.013
ZU Qi, XIAO Dong, PENG Dekun, et al. Temperature-load Coupling Effect on Creep Characteristics of Polypropylene Steel Fiber Reinforced Concrete[J]. Plastics Science and Technology. 2025, 53(03): 71-76 https://doi.org/10.15925/j.cnki.issn1005-3360.2025.03.013

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基金

四川省轨道交通线路智慧运维工程研究中心课题(2024GD-Y13)

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