隧道二衬聚丙烯纤维混凝土耐火技术研究
发布时间:2018-01-05 03:02
本文关键词:隧道二衬聚丙烯纤维混凝土耐火技术研究 出处:《河北工业大学》2014年硕士论文 论文类型:学位论文
更多相关文章: 隧道 高温 混凝土 聚丙烯纤维 抗压强度 爆裂
【摘要】:随着交通经济发展,隧道长度和数量逐年增加。一旦发生火灾严重威胁人们的生命财产安全,因此隧道结构耐火性能不容忽视。隧道衬砌结构的耐火是隧道防火安全的重要组成部分,国内外大量的隧道火灾案例,均表明了发生火灾对衬砌结构的严重损害。最近几年研究表明,混凝土中掺入聚丙烯纤维,具有良好的防火性能。随着纤维混凝土应用日益普遍,研究聚丙烯纤维混凝土的高温性能具有重要意义。 本文针对隧道衬砌结构掺加聚丙烯纤维的混凝土,对其工作性及高温下耐火性能做了如下几方面的研究。 1、通过研究不同长度以及不同含量纤维对混凝土坍落度的影响规律,探讨了聚丙烯纤维对混凝土工作性能的影响。通过研究不同长度以及不同含量的聚丙烯纤维在不同温度场下对混凝土抗压强度的影响,并与素混凝土进行试验对比,归纳不同温度场下聚丙烯纤维混凝土和素混凝土的强度变化规律。研究结果表明,无论纤维混凝土还是素混凝土抗压强度均随温度升高逐渐降低,且纤维的含量在一定范围内对混凝土强度影响较小。 2、研究素混凝土以及纤维混凝土大板试件(不同长度不同含量的聚丙烯纤维)在高温作用下表观变化、裂缝发展、爆裂情况以及烧蚀作用后强度变化和内部结构的温度变化规律等。结果表明聚丙烯纤维能有效抵抗高温下混凝土结构的爆裂破坏,保证结构的完整性,并阐述了聚丙烯纤维在混凝土内部结构的作用机理以及应用前景。 3、在总结过火后混凝土的评价方法,,优缺点以及应用范围的基础上,研究了混凝土不同温度场下动弹模量的变化规律,以及检测混凝土火损的化学滴定法。为受火损伤混凝土的承载能力、损伤程度的分析和评估,提供参考依据。
[Abstract]:With the traffic economic development, tunnel length and the number increased year by year. Once the fire a serious threat to people's life and property safety, so the refractory tunnel structure can not be ignored. The performance of tunnel lining refractory is an important part of fire safety of tunnel tunnel fire, a large number of cases at home and abroad show that the fire damage to the lining structure in recent years study showed that polypropylene fiber in concrete, has good fireproof performance. With the increasingly widespread application of fiber reinforced concrete, has important significance to study on high temperature properties of polypropylene fiber reinforced concrete.
In this paper, the concrete with polypropylene fiber is added to the tunnel lining structure, and the working property and the fire resistance performance at high temperature are studied in the following aspects.
1, through the study of different length and different content of fiber on the influence of concrete slump, discusses the effect of polypropylene fiber on the performance of the concrete. Through the study of different length and different content of the influence of polypropylene fiber on the compressive strength of concrete in different temperature fields, and the contrast experiment with the plain concrete, the temperature field under different induction polypropylene fiber reinforced concrete and plain concrete strength variation. The results show that both fiber reinforced concrete or plain concrete compressive strength increased with temperature gradually decreased, and the content of fiber has little influence on the strength of concrete in a certain range.
2, the research of plain concrete and fiber reinforced concrete slab specimens (with different length of polypropylene fiber with different content) to change, in under the action of high temperature crack development, burst and ablation intensity changes and internal structure of the temperature variation. The results show that the polypropylene fiber can effectively resist the burst of concrete structure damage under high temperature and to ensure the integrity of the structure, and expounds the mechanism of polypropylene fiber in concrete structure and application prospects.
In 3, the evaluation method of concrete summary after the fire, the advantages and disadvantages and the application scope of the study, the variation of concrete elastic modulus under different temperature field, and the fire damage detection of concrete chemical titration. For the bearing capacity of fire damaged concrete, analysis and evaluation of the damage process, provide a reference.
【学位授予单位】:河北工业大学
【学位级别】:硕士
【学位授予年份】:2014
【分类号】:U455.91
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