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首页> 外文学位 >Development and construction of Low-Cracking High-Performance Concrete (LC-HPC) bridge decks: Construction methods, specifications, and resistance to chloride ion penetration.
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Development and construction of Low-Cracking High-Performance Concrete (LC-HPC) bridge decks: Construction methods, specifications, and resistance to chloride ion penetration.

机译：低裂缝高性能混凝土（LC-HPC）桥面的开发和施工：施工方法，规格和耐氯离子渗透性。

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摘要

The development, construction, and evaluation of Low-Cracking High-Performance Concrete (LC-HPC) bridge decks are described based on laboratory test results and experiences gained through the construction of 14 LC-HPC bridge decks. The study is divided into three parts covering (1) an evaluation of the chloride penetration into concrete using long-term salt-ponding tests, (2) a comprehensive discussion of specifications for LC-HPC construction and standard practices in Kansas, and (3) the description of the construction and the preliminary evaluation of LC-HPC bridge decks in Kansas. This report emphasizes the construction process a companion report provides a detailed discussion of the influence of material properties on the performance of LC-HPC bridge decks.The first portion of the study involves evaluating the effect of paste content, curing period, water-cement (w/c) ratio, cement type and fineness, mineral admixtures (ground granulated blast furnace slag and silica fume), a shrinkage reducing admixture (SRA), and standard DOT bridge deck mixtures on chloride penetration into solid concrete, tested in accordance with AASHTO T 259. The evaluation includes a total of 33 individual concrete batches and 123 test specimens. The results indicate that for concrete containing only portland cement, reductions in paste content result in increased permeability. A reduced paste content and increased w/c ratio result in increased permeability, whereas the presence of mineral admixtures (ground granulated blast furnace slag and silica fume) and longer curing periods result in decreased permeability. Concrete made with medium or coarse ground Type II cement has greater permeability than concrete made with Type I/II cement. It is not clear how the presence of an SRA affects concrete permeability. LC-HPC mixtures have lower permeability than standard DOT mixtures.The second portion of the study describes the specifications for the LC-HPC and Control bridge decks in Kansas. The focus is on the construction methods, including the evolution of the specifications over time.The third portion of the study details the development and construction of 14 LC-HPC and 12 conventional Control bridge decks built in Kansas. The design details, construction experiences, and lessons learned from the LC-HPC bridge decks are described in detail, and an overview of the materials is presented the design and construction data for each Control deck is provided and initial crack survey results are evaluated for various construction-related parameters. The results indicate that successful LC-HPC bridge deck construction is repeatable and that clear and consistent communication between the contractor, owner, and testing personnel is vital for successful construction of LC-HPC decks. Preliminary evaluation of cracking indicates that at early ages, LC-HPC decks are performing better than the Control decks, as well as earlier monolithic decks in Kansas.Keywords: bridge decks, cement fineness, chloride penetration, concrete mix design, concrete pumping, construction methods, cracking, curing, durability, finishing, high-performance concrete, permeability, salt-ponding, shrinkage reducing admixture, slag, silica fume, temperature control.
机译：根据实验室测试结果和通过建设14个LC-HPC桥面板获得的经验，描述了低裂缝高性能混凝土（LC-HPC）桥面板的开发，建设和评估。这项研究分为三个部分，内容包括：（1）使用长期盐渍试验评估氯离子在混凝土中的渗透；（2）堪萨斯州LC-HPC施工规范和标准规范的全面讨论；（3） ）堪萨斯州LC-HPC桥面板的施工说明和初步评估。本报告强调了施工过程，同时伴随报告对材料特性对LC-HPC桥面板的性能的影响进行了详细讨论。研究的第一部分涉及评估糊料​​含量，固化时间，水灰泥（ w / c）比率，水泥类型和细度，矿物掺合料（高炉矿渣和硅粉），减缩掺合料（SRA）和氯渗透到固体混凝土中的标准DOT桥面混合物，均根据AASHTO测试T 259.评估包括总共33个混凝土批次和123个试样。结果表明，对于仅含硅酸盐水泥的混凝土，减少浆糊含量会增加渗透性。减少的糊料含量和增加的w / c比导致增加的渗透性，而存在矿物掺合料（磨碎的高炉矿渣和硅粉）和更长的固化时间导致减少的渗透性。用中型或粗型II型水泥制成的混凝土的渗透性比用I / II型水泥制成的混凝土更高。尚不清楚SRA的存在如何影响混凝土的渗透性。 LC-HPC混合物的渗透性低于标准DOT混合物。研究的第二部分描述了堪萨斯州LC-HPC和控制桥面板的规格。研究的重点是施工方法，包括随着时间的推移规格的演变。研究的第三部分详细介绍了在堪萨斯州建造的14台LC-HPC和12台常规控制桥面板的开发和施工。详细介绍了LC-HPC桥面板的设计细节，施工经验和经验教训，并对材料进行了概述，并提供了每个控制面板的设计和施工数据，并对各种结构的初始裂缝测量结果进行了评估与施工有关的参数。结果表明，成功的LC-HPC桥面甲板施工是可重复的，承包商，业主和测试人员之间的清晰一致的沟通对于LC-HPC桥面甲板的成功施工至关重要。初步的开裂评估表明，在早期，LC-HPC甲板的性能优于控制甲板以及堪萨斯州的较早的整体式甲板。关键词：桥梁甲板，水泥细度，氯化物渗透，混凝土配合比设计，混凝土泵送，施工方法，开裂，固化，耐久性，整理，高性能混凝土，渗透性，盐浸，减少收缩剂，矿渣，硅粉，温度控制。

著录项

  • 作者

    McLeod, Heather Anne Kirkvold.;

  • 作者单位

    University of Kansas.;

  • 授予单位 University of Kansas.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 849 p.
  • 总页数 849
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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