Remote monitoring of concrete condition (REMOCC)

钢纤维混凝土的市场份额正在增加，这是因为其寿命性能的提高，以及减少或消除钢筋的机会。以前的工作表明，某些类别的钢筋钢纤维可以作为被动传感器，可以使用外部电磁传感器进行检测。研究表明，这些无源传感器在混凝土加载和卸载直至最终失效时都显示出可逆和不可逆效应。该项目开展的传感工作最初是基于使用交流电流频率调制(ACFM)或变种的现成仪器。虽然成功地证明了这种方法的可行性，但即使在FRC中工业使用的低钢纤维浓度(约2%)，它在空间分辨率和渗透深度方面也是有限的。现在需要发展传感器技术来优化传感器应用，以改进传感器应用，以便作为资产管理的一部分，在整个生命周期内监测混凝土结构的状况。还预计将出现下行创新。将传感能力轻松集成到混凝土结构中，将通过以下方式提高土木工程设计、建造和维护的竞争力：*确认指定水平的纤维分布*允许更精简的设计减少大型结构中的混凝土总质量，从而减少体现能量/碳*渐进或单一损坏事件后的损坏状态指示，从而使结构可以修复而不是更换*该项目将有助于加速FRC对钢筋的置换。安装钢筋的成本和时间都很昂贵，而且事故率也很高，因此转向FRM将提高竞争力

Steel Fibre Reinforced Concrete is gaining market share because of lifetime performance improvements and the opportunity to reduce or eliminate rebar. Previous work has shown that some classes of reinforcing steel fibres can act as passive sensors which can be inspected using external electromagnetic sensing. It was demonstrated that these passive sensors indicate reversible and irreversible effects in concretes loaded and unloaded up to eventual failure.The sensing work undertaken in the project was initially based on an off-the-shelf instrument using Alternative Current Frequency Modulation (ACFM) or variant. Although successful in demonstrating the feasibility of the approach even at the low steel fibre concentrations used industrially in FRC (around 2%) it was limited both in terms of spatial resolution and penetration depth. Development of the sensor technology is now needed to optimize for the sensing application to improve so that condition of concrete structures can be monitored through life as part of asset management.Downsteam innovations are also anticipated. Easy integration of sensing capability into concrete structures will improve competitiveness in civil engineering design, build and maintainance by* confirmation of distribution of fibres at specified levels* allowing leaner design to reduce total mass of concrete in large structure with consequential reduction in embodied energy/carbon* indications of damage state after progressive or singular damage events so structures can be repaired instead of replaced* the project will help accelerate the displacement of rebar by FRC. Rebar installation is expensive both in cost and time and also suffers from a high accident rate, so the shift towards FRM will enhance competitiveness