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Development of a performance based, integrated design/selection mixture methodology for fiber reinforced concrete airfield pavements.

机译：针对纤维增强混凝土飞机场路面的基于性能的集成设计/选择混合方法的开发。

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摘要

Recent advances in polymer technology have given rise to new research regarding conventional building materials like concrete and the rheological material properties of polymer fiber-concrete composites. Polymers such as polypropylene fiber are now the industry standard for manufacture of geosynthetics which are used as the structural element in earth walls, stabilized slopes, and to improve soft soil bearing capacity. Both industry and researchers now recognize the benefits of polypropylene fiber reinforced concrete in reducing temperature and shrinkage cracking and crack widths, which is important distress criteria in airfield pavements. However, little attention has been given to the use of high tensile strength polypropylene as a structural component of concrete pavements. As important as the research, is the methodology used to obtain the results. There is a need to consider concrete mixture design and selection in conjunction with pavement design since specific mixture properties' behavior and performance characteristics are set by pavement design requirements. Such approach will permit the development of an "integrated mixture selection-pavement design methodology". This study quantified the beneficial strength properties of small volume (less than 0.5%) polypropylene fiber reinforced concrete (FRC) as an airfield pavement to meet both military and civilian aviation needs. Polypropylene fiber reinforcement in small volumes displays none of the historical problems of poor workability, or excessive pavement deflections associated with fiber-concrete composites in larger volumes. Through laboratory testing of material properties such as fatigue, toughness and flexural strength and computer modeling this composite showed a consistent improvement in those strength properties that would increase the life of the pavement structure under repetitive aircraft traffic. Perhaps, the most unique property of this composite is its ability to continue to absorb energy after first crack, ductile properties not typically associated with a brittle material like concrete. This increase in toughness is significant to the military in mitigating heaved pavement around bomb damaged runway craters during rapid runway repair. Analogues to safety glass, FRC will mitigate radial fracturing of airfield pavement located around the crater impact area reducing time to repair heaved pavement, an important criteria to air base survivability. This dissertation serves as a blueprint to comprehensively evaluate both design and performance of any fiber concrete composite.
机译：聚合物技术的最新进展引起了对常规建筑材料（如混凝土）和聚合物纤维-混凝土复合材料的流变材料性能的新研究。如今，聚合物（例如聚丙烯纤维）已成为制造土工合成材料的工业标准，被用作土墙，稳定的斜坡和提高软土承载能力的结构元素。工业界和研究人员现在都认识到聚丙烯纤维增强混凝土在降低温度，收缩裂缝和裂缝宽度方面的好处，这是飞机场路面的重要遇险标准。但是，很少有人注意使用高抗张强度聚丙烯作为混凝土路面的结构组分。与研究一样重要的是用于获得结果的方法。由于路面设计要求确定了特定的混合料性能和性能特征，因此需要结合混凝土路面设计来考虑混凝土的混合料设计和选择。这种方法将允许开发“集成的混合料选择-路面设计方法”。这项研究量化了作为飞机场路面的小体积（小于0.5％）聚丙烯纤维增强混凝土（FRC）的有益强度特性，可以同时满足军事和民航需求。小体积的聚丙烯纤维增强材料没有显示出可加工性差或大体积的纤维混凝土复合材料带来的过大路面变形的历史问题。通过对材料特性（例如疲劳，韧性和弯曲强度）进行实验室测试，并通过计算机建模，这种复合材料显示出这些强度特性的持续改善，从而可以在重复的飞机交通中延长路面结构的使用寿命。也许，这种复合材料最独特的性能是其在第一次开裂后能够继续吸收能量的能力，而韧性通常不与像混凝土这样的脆性材料相关。韧性的提高对于军方在快速跑道修复期间减轻炸弹损坏的跑道坑周围的沉重路面非常重要。与安全玻璃类似，FRC将减轻弹坑撞击区域周围的飞机场径向裂痕，从而减少维修重路面的时间，这是空军基地生存能力的重要标准。本文是全面评估任何纤维混凝土复合材料的设计和性能的蓝图。

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  • 作者

    Bennie, Stewart David.;

  • 作者单位

    University of Maryland, College Park.;

  • 授予单位 University of Maryland, College Park.;
  • 学科 Engineering Civil.
  • 学位 Ph.D.
  • 年度 2004
  • 页码 238 p.
  • 总页数 238
  • 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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