Remote monitoring of concrete condition (REMOCC)

钢纤维增强混凝土正在获得市场份额，因为寿命性能的改善和减少或消除钢筋的机会。以前的工作表明，某些类别的钢筋纤维可以作为被动传感器，可以使用外部电磁传感进行检查。结果表明，这些被动传感器表明，可逆和不可逆的影响，在混凝土加载和卸载到最终failure.The传感工作在该项目中进行的最初是基于一个现成的仪器，使用交流频率调制（ACFM）或变种。尽管成功地证明了该方法的可行性，即使在FRC工业中使用的低钢纤维浓度（约2%）下，它在空间分辨率和穿透深度方面都是有限的。现在需要开发传感器技术，以优化传感应用，以改善混凝土结构的状况，从而可以作为资产管理的一部分进行终身监测。将传感能力轻松集成到混凝土结构中将提高土木工程设计的竞争力，通过 * 确认纤维在指定水平的分布 * 进行更精简的设计，以减少大型结构中的混凝土总质量，从而减少隐含能量/碳 * 指示渐进或单一损坏事件后的损坏状态，以便结构可以修复而不是更换 * 该项目将有助于加快FRC取代钢筋。钢筋安装成本高、时间长，而且事故率高，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