高温后纤维素对聚丙烯纤维混凝土力学性能研究
Experimental study on the mechanical properties of polypropylene fiber concrete affected by cellulose after high temperature
程健 1陈修成 2宁熙雯 2朱冠龙 2刘浩然2
作者信息
- 1. 青岛理工大学土木工程学院,山东 青岛 266033;临沂市重点实验室,山东 临沂 273400
- 2. 青岛理工大学土木工程学院,山东 青岛 266033
- 折叠
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.
Abstract
In order to study the effect of cellulose on the mechan-ical properties of polypropylene fiber concrete after high tempera-ture,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 speci-men increases,at room temperature,the compressive strength of fiber concrete with 1%fiber content is better,when the tempera-ture 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.
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Key words
polypropylene fiber concrete/mechanical properties/high temperature/hydroxypropyl methylcellulose/compressive strength引用本文复制引用
出版年
2025
NETL
NSTL
万方数据