摘要
为了研究高温后纤维素对聚丙烯纤维混凝土力学性能影响,共设计90个立方体试块和90个棱柱体试块,对其进行200~800℃的高温试验,分析其高温后试块的质量损失和力学性能。结果表明:①温度低于400℃时,混凝土质量损失较慢,高于600℃后,试件质量损失率迅速增大,掺纤维素时试件的质量损失率有所降低;②抗压强度随着温度的升高而降低,并且随着纤维掺量的增加,试件的抗压强度有所提高,常温下1%纤维掺量的纤维混凝土抗压强度较好,温度高于400℃后,掺纤维素后混凝土的抗压强度会显著降低;③抗折强度随纤维掺量的增加而增大,但纤维素的掺入会降低聚丙烯纤维混凝土高温后抗折强度。
In order to study the effect of cellulose on the mechanical properties of polypropylene fiber concrete after high temperature,a total of 90 cube test blocks and 90 prism test blocks were designed and subjected to high temperature tests at 200~800℃to analyze the mass loss and mechanical properties of the test blocks after high temperature.The results show that:①when the temperature is below 400℃,the mass loss of concrete is slower,when the temperature is above 600℃,the mass loss rate of the specimen rapidly increases,and when cellulose is added,the mass loss rate of the specimen decreases;②the compressive strength decreases with the increase of temperature,and with the increase of fiber content,the compressive strength of the specimen increases,at room temperature,the compressive strength of fiber concrete with 1%fiber content is better,when the temperature is above 400℃,the compressive strength of concrete with fiber content will significantly decrease;③the flexural strength increases with the increase of fiber content,but the addition of cellulose will reduce the flexural strength of polypropylene fiber reinforced concrete after high temperature.
作者
程健
陈修成
宁熙雯
朱冠龙
刘浩然
CHENG Jian;CHEN Xiucheng;NING Xiwen;ZHU Guanlong;LIU Haoran(Department of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Linyi Key Laboratory,Linyi 273400,China)
出处
《四川建材》
2025年第1期32-34,67,共4页
Sichuan Building Materials
关键词
聚丙烯纤维混凝土
力学性能
高温
羟丙基甲基纤维素
抗压强度
polypropylene fiber concrete
mechanical properties
high temperature
hydroxypropyl methylcellulose
compressive strength
