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首页> 外文会议>NDE/NDT for Highways and Bridges >Experimental and Theoretical Investigations of Electrical Impedance Based Sensing for Microstructure and Property Determination of Concrete in Transportation Infrastructure
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Experimental and Theoretical Investigations of Electrical Impedance Based Sensing for Microstructure and Property Determination of Concrete in Transportation Infrastructure

机译：基于电气阻抗的微观结构和性能测定在运输基础设施中的微观结构和性能测定的实验与理论研究

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摘要

A significant number of bridges and pavements in the United States have Portland cement concrete as their major structural component. Estimating the properties of Portland cement concrete in the fresh and hardened stages is crucial in arriving at decisions regarding opening of the structure to service, condition assessment and repair procedures, c residual service life calculations. Concrete changes from a highly viscous fluid as soon as it is placed to a solid phase when it finally sets. Solid phases continue to form within the material structure even after this time, albeit at a slower rate, and this process will theoretically be complete only after either water that is needed for the cement to hydrate, or the unhydrated cement grains are no longer present in the system. The early-age behavior of concretes is very important because many of the later-age properties are inherently dependent on microstructural changes that occur at early ages. The formation of solid hydration products results in a reduction in porosity and connectivity of pore channels, that has implications in the mechanical as well as durability performance of the material. Since the strength of concretes is very closely related to its porosity, the determination of changes in porosity as the concrete ages (decrease in porosity with time because of cement hydration, and increase in porosity at later ages due to deterioration mechanisms) could be transformed into reliable indicators of mechanical performance.
机译：美国的大量桥梁和路面有波特兰水泥混凝土作为其主要结构部件。在新鲜和硬化阶段估算波特兰水泥混凝土的特性至关重要，在抵达有关服务，条件评估和修复程序的结构，条件评估和修理程序，C剩余使用寿命计算方面的决定是至关重要的。一旦它终于设置到固相时，混凝土从高度粘性流体变动。即使在这段时间之后，固体相也继续形成材料结构内，尽管以较慢的速率，但是在水泥水合物所需的水之后理论上，本方法理论上是完全的，或者不再存在未水解的水泥晶粒系统。混凝土的早期性行为非常重要，因为许多后期性质本质上是依赖于早期期间发生的微观结构变化。固体水合产物的形成导致孔通道的孔隙率和连通性降低，这在机械以及材料的耐久性性能中具有影响。由于混凝土的强度与其孔隙率密切相关，因此测定孔隙率的变化作为混凝土老化（由于水泥水合而随时间的孔隙率降低，并且由于劣化机构而在后续时代的孔隙率的增加）可以转化为可靠的机械性能指标。

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