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Development of conditioning and test method for assessment of durability of FRC exposed to severe environments.

机译：开发用于评估FRC在恶劣环境下的耐久性的条件和测试方法。

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摘要

An experimental program was performed to evaluate durability of FRC produced with four fiber types (polypropylene/PP, polyvinyl-alcohol/PVA, hooked-end steel/St, and cellulose/Cell). The effect of cellulose could not be evaluated because good fiber distribution was not achieved in laboratory mixing. Transport properties indicated that the addition of fibers to concrete improved the resistance of mass transport of deleterious materials; steel fibers were best. Fibers provided for post-cracking resistance; again, steel fibers were best. FRC beams produced with two concrete classes were subjected to simulated saltwater (immersed and wet/dry) and swamp (acid) environments for 27 months. Effect of fibers on durability could not be assessed reliably based on test results from either average residual strength (ASTM C1399) or flexural performance tests (ASTM C1609) because of non-uniform degradation and stress/strain distributions, as well as development of multiple cracks. Indirect tension testing (IDT) was identified as a more effective approach to achieve a uniformly-degraded cross-section and uniform stress/strain distribution. FRC specimens were subjected to an additional six months of saltwater conditioning, after which cracking and post-cracking behavior was assessed with IDT using testing and data interpretation procedures specifically designed to capture the effects of fibers. Test results indicated that PP fibers had the best resistance to saltwater environments (immersed and wet/dry), while PVA fibers had the worst, and resistance of steel fibers was somewhere between these two. However, steel fibers did not do well in fully immersed environments, but showed little or no degradation in wet/dry environments. The detrimental effect of acetic acid on aggregate and cement overwhelmed the degradation mechanism in swamp water, so the effect of fibers could not be distinguished for this environment. It was concluded that PP has the best durability for non-structural applications in saltwater environments. Steel may be suitable in non-submerged saltwater environments, particularly for structural applications, but should not be used if it will be in direct contact with reinforcing bars because it was found to accelerate corrosion of the bars. PVA should not be used in saltwater environments. Finally, it was concluded that transport properties alone are not necessarily good indicators of resistance to degradation.
机译：进行了一个实验程序，以评估四种纤维类型（聚丙烯/聚丙烯，聚乙烯醇/聚乙烯醇，钩端钢/苯乙烯和纤维素/纤维素）生产的FRC的耐久性。由于在实验室混合中无法获得良好的纤维分布，因此无法评估纤维素的效果。传输性能表明，向混凝土中添加纤维提高了有害物质的大规模传输的抵抗力。钢纤维是最好的。提供抗开裂性的纤维；同样，钢纤维是最好的。用两种混凝土等级生产的FRC梁在模拟盐水（浸泡和湿/干）和沼泽（酸）环境中经受了27个月的测试。由于平均降解强度（ASTM C1399）或弯曲性能测试（ASTM C1609）的测试结果，由于不均匀的降解和应力/应变分布以及出现多个裂纹，无法可靠地评估纤维对耐用性的影响。间接张力测试（IDT）被认为是实现均匀降解的横截面和均匀应力/应变分布的更有效方法。对FRC标本再进行六个月的盐水处理，然后使用专门设计用于捕获纤维效应的测试和数据解释程序，用IDT评估开裂和开裂后的行为。测试结果表明，PP纤维对盐水环境（浸泡和湿/干）的抵抗力最佳，而PVA纤维的抵抗力最差，而钢纤维的抵抗力介于两者之间。但是，钢纤维在完全浸入的环境中表现不佳，但在湿/干环境中几乎没有降解或没有降解。乙酸对骨料和水泥的有害作用使沼泽水中的降解机理不堪重负，因此在这种环境下无法区分纤维的作用。结论是，PP对于盐水环境中的非结构性应用具有最佳的耐久性。钢可能适合在非淹没盐水环境中使用，特别是用于结构应用，但是如果钢与钢筋直接接触，则不宜使用钢，因为它会加速钢筋的腐蚀。 PVA不应在盐水环境中使用。最后，得出的结论是，仅运输性质并不一定是抗降解的良好指标。

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  • 作者

    Kim, Byoungil.;

  • 作者单位

    University of Florida.;

  • 授予单位 University of Florida.;
  • 学科 Engineering Civil.;Engineering Mechanical.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 253 p.
  • 总页数 253
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

  • 入库时间 2022-08-17 11:38:25

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