聚丙烯-钢纤维混凝土蠕变特性的温度-荷载耦合效应  

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

作　　者：俎琪 肖东 彭德坤 王育康 黄锐 ZU Qi;XIAO Dong;PENG Dekun;WANG Yukang;HUANG Rui(Xuchang Vocational and Technical College,Xuchang 461000,China;Chengdu Vocational&Technical College of Industry,Chengdu 610218,China;China MCC5 Group Corp.,Ltd.,Chengdu 610063,China;Sichuan Highway Planning,Survey,Design and Research Institute Co.,Ltd.,Chengdu 610041,China)

机构地区：[1]许昌职业技术学院,河南许昌461000 [2]成都工业职业技术学院,四川成都610218 [3]中国五冶集团有限公司,四川成都610063 [4]四川省公路规划勘察设计研究院有限公司,四川成都610041

出　　处：《塑料科技》2025年第3期71-76,共6页Plastics Science and Technology

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)。

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)。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℃ to 800℃.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(εtrc)accounted for a significant proportion of the total strain.The temperature range and stress level had a significant impact onεtrc,especially at temperatures above 500℃ and stress levels above 40%.When the target temperature was constant and the totalεtrc was fixed,the heating rate was positively correlated with the rate ofεtrc increase.Adding steel fibers to normal-strength concrete could slightly reduce theεtrc of the concrete,while incorporating polypropylene fibers into high-strength concrete significantly increased theεtrc.

关 键 词：蠕变应变 热力耦合 耐火性 钢纤维 聚丙烯纤维 

分 类 号：U213.1[交通运输工程—道路与铁道工程]