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Characterization and Performance of Eco and Crack-Free High-Performance Concrete for Sustainable Infrastructure

机译：可持续基础设施用生态和无裂纹高性能混凝土的表征和性能

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摘要

The main objective of this study is to develop, characterize, and validate the performance of a new class of environmentally friendly, economical, and crack-free high-performance concrete referred to as Eco and crack-free HPC that is proportioned with high content of recycle materials. Two classes of Eco-HPC are designed for: (I) pavement (Eco-Pave-Crete); and (II) bridge infrastructure (Eco-Bridge-Crete). Eco-HPC mixtures were designed to have relatively low binder content up to 350 kg/m3 and develop high resistance to shrinkage and superior durability. A stepwise mixture design methodology was proposed to: (i) optimize binder system and aggregate skeleton to optimize packing density and flow characteristics; (ii) evaluate synergy between shrinkage mitigating materials, fibers, and moist curing duration to reduce shrinkage and enhance cracking resistance; and (iii) validate performance of Eco HPCs. The composition-reaction-property correlations were developed to link the hydration kinetics of various binder systems to material performance in fresh state (rheological properties) and hardened state (strength gain and shrinkage cracking tendency). Results indicate that it is possible to design Eco-HPC with drying shrinkage lower than 300 mustrain after 250 days and no restrained shrinkage cracking even after 55 days. Reinforced concrete beams made with Eco-Bridge-Crete containing up to 60% replacement of cement with supplementary cementitious materials and recycled steel fibers developed significantly higher flexural toughness compared to the reference concrete used for bridge applications. In parallel, autogenous crack healing capability of concrete equivalent mortar mixtures was monitored using microwave reflectometry nondestructive testing technique. Research is in progress towards analyzing life cycle assessment of Eco-HPCs under field condition.
机译：这项研究的主要目的是开发，表征和验证新型环保，经济和无裂纹高性能混凝土，即高性能和无裂纹高性能混凝土。回收材料。两类Eco-HPC设计用于：（I）路面（Eco-Pave-Crete）； （II）桥梁基础设施（Eco-Bridge-Crete）。 Eco-HPC混合物被设计为具有相对较低的粘合剂含量，最高可达350 kg / m3，并具有较高的抗收缩性和出色的耐久性。提出了一种逐步的混合物设计方法，以：（i）优化粘合剂体系和骨料骨架，以优化填充密度和流动特性； （ii）评估减缩材料，纤维和湿固化持续时间之间的协同作用，以减少收缩并增强抗裂性； （iii）验证Eco HPC的性能。建立了组成-反应-性能相关性，以将各种粘合剂体系的水合动力学与新鲜状态（流变性质）和硬化状态（强度增加和收缩开裂趋势）下的材料性能联系起来。结果表明，有可能设计出250天后干缩率低于300的Mustrain的Eco-HPC，甚至在55天后也没有抑制收缩的开裂。与桥梁应用的参考混凝土相比，用Eco-Bridge-Crete制成的钢筋混凝土梁最多可替代60％的水泥，并补充了辅助胶结材料和再生钢纤维，从而产生了更高的抗弯韧性。同时，使用微波反射法无损检测技术监测了混凝土当量砂浆混合物的自生裂纹愈合能力。在现场条件下分析Eco-HPC生命周期评估的研究正在进行中。

著录项

  • 作者

    Mehdipour, Iman.;

  • 作者单位

    Missouri University of Science and Technology.;

  • 授予单位 Missouri University of Science and Technology.;
  • 学科 Civil engineering.
  • 学位 Ph.D.
  • 年度 2017
  • 页码 398 p.
  • 总页数 398
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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