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Carbon fibre reinforced reactive powder concrete (CFRRPC) anchorage system.

机译：碳纤维增强活性粉末混凝土（CFRRPC）锚固系统。

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摘要

An anchorage for Carbon Fibre Reinforced Polymer (CFRP) tendons was developed at the University of Calgary. The anchorage material used was Ultra High Performance Concrete (UHPC) with strengths in the order of 200 MPa at 7 days. Micro carbon fibres were incorporated in the mix to increase fracture toughness. The problem with this non-metallic anchor is its relatively large size compared to a standard steel pre-stressing anchorage, and the low strength of UHPC designed required four CFRP sheets for wrapping the barrel.; The objective of the research conducted in this thesis was to design, conduct a material investigation, and test a new non-metallic UHPC anchorage system for durability, creep and fatigue. The anchorage system is used for post-tensioning of concrete or masonry applications, using Carbon Fibre Reinforced Polymer (CFRP) tendons. The project involved the testing of concrete composites that consist of silica fume, micro carbon fibres, superplasticizer, and pozzolanic reactive aggregate. Reactive powder concrete (RPC) was utilized in order to reach ultimate mechanical, durability and corrosion free properties that assisted in the manufacture of a smaller and more durable anchorage system, with enhanced fracture toughness. Ultimate mix design and different curing regimes were examined with a view to achieving the close dimensional tolerance required of the anchorage system when demoulded.; The anchorage is used to hold the tendon through mechanical gripping. The anchorage consisted of a barrel and four wedges all made out of the Carbon Reinforced Reactive Powder Concrete (CFRRPC). The anchor barrel was wrapped in CFRP sheets to provide the tensile strength to resist barrel failure when the tendon is loaded and the wedges grip in the barrel.; For the CFRRPC: compressive strengths exceeding 500 MPa in four days were reached. The CFRRPC anchorage showed excellent mechanical performance with more than a 50% reduction in designed dimensions size compared to the original UHPC anchorage. The different requirements of a post-tensioning anchorage system were also fulfilled including passing PTI requirements for post-tensioning systems.; The new anchorage thus provides the convenience and compatibility of on-site post-tensioning of structures with a metal-free (non-corroding) system.
机译：卡尔加里大学开发了碳纤维增强聚合物（CFRP）筋的锚固件。所使用的锚固材料是7天内强度约为200 MPa的超高性能混凝土（UHPC）。将微碳纤维掺入混合物中以增加断裂韧性。这种非金属锚的问题在于，与标准的钢预应力锚相比，它的尺寸相对较大； UHPC设计的强度低，需要四张CFRP板包裹筒体。本文的研究目的是设计，进行材料研究，并测试一种新的非金属UHPC锚固系统的耐用性，蠕变和疲劳性。锚固系统使用碳纤维增强聚合物（CFRP）筋用于混凝土或砖石应用的后张。该项目涉及测试由硅粉，微碳纤维，高效减水剂和火山灰反应性骨料组成的混凝土复合材料。为了达到最终的机械，耐久性和无腐蚀性能，使用了反应性粉末混凝土（RPC），有助于制造更小，更耐用的锚固系统，并提高了断裂韧性。为了达到脱模时锚固系统所需的紧密尺寸公差，研究了最终混合物的设计和不同的固化方式。锚固用于通过机械抓握来固定肌腱。锚固包括一个桶和四个楔形，全部由碳增强活性粉末混凝土（CFRRPC）制成。锚杆筒用CFRP板包裹，以提供抗拉强度，以抵抗在加载腱并楔入筒体时的筒体破坏。对于CFRRPC：在四天内达到了超过500 MPa的抗压强度。与原始的UHPC锚固相比，CFRRPC锚固具有出色的机械性能，设计尺寸尺寸减少了50％以上。还满足了后张锚固系统的不同要求，包括通过了对后张锚固系统的PTI要求。因此，新的锚固提供了结构的现场无金属（无腐蚀）后张紧的便利性和兼容性。

著录项

  • 作者

    Shaheen, Ehab Abdel Hameed.;

  • 作者单位

    University of Calgary (Canada).;

  • 授予单位 University of Calgary (Canada).;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 292 p.
  • 总页数 292
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 建筑科学;
  • 关键词

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