Maurya Krishna Kumar, Rawat Anupam, Shanker Rama
Department of Civil Engineering, Motilal Nehru National Institute of Technology Allahabad, Prayagraj, 211004, India.
Environ Sci Pollut Res Int. 2023 Feb;30(10):25382-25401. doi: 10.1007/s11356-022-21949-6. Epub 2022 Jul 14.
Health monitoring of structures using techniques based on the smart material is an innovative concept that is exploding technological revolutions in the field of civil engineering. The electro-mechanical impedance (EMI) technique is used for structural health monitoring (SHM) and to investigate the damages in the structures. The bacterial incorporation in concrete produces calcite material through metabolism process in presence of moisture and carbon dioxide, which improves the mechanical properties of concrete. Hence, its application in construction of the buildings will improve the health of structures. In this research paper, dynamic behaviour of the bacterial concrete was investigated numerically. The beams of size 700 × 150 × 150 mm of bacterial concrete and control concrete were modelled using finite element-based package ANSYS19. The beam of bacterial concrete was simulated as per the characteristics of the materials produced after the bacterial metabolism reactions. The EMI technique was applied to investigate the health of these beams. Admittance (conductance and susceptance) signatures were determined using piezo-ceramic lead zirconate titanate (PZT) sensors installed at mid-point on the top surface of concrete beams. The beams were exposed to dynamic loading and the intensity of dynamic loading was increased in four sub-steps. For the quantification of strength development in the concrete beam, the root mean square deviation (RMSD) statistical index had been applied. It was observed that the bacterial concrete beam has more resistance to the dynamic loading.
利用基于智能材料的技术对结构进行健康监测是一个创新概念，正在引发土木工程领域的技术革命。机电阻抗（EMI）技术用于结构健康监测（SHM）以及调查结构中的损伤。细菌掺入混凝土中会在有水分和二氧化碳存在的情况下通过新陈代谢过程产生方解石材料，这会改善混凝土的力学性能。因此，其在建筑物施工中的应用将改善结构的健康状况。在本研究论文中，对细菌混凝土的动态行为进行了数值研究。使用基于有限元的软件包ANSYS19对尺寸为700×150×150mm的细菌混凝土梁和对照混凝土梁进行建模。根据细菌新陈代谢反应后产生的材料特性对细菌混凝土梁进行模拟。应用EMI技术来调查这些梁的健康状况。使用安装在混凝土梁顶面中点的压电陶瓷锆钛酸铅（PZT）传感器确定导纳（电导和电纳）特征。梁承受动态荷载，并且在四个子步骤中增加动态荷载的强度。为了量化混凝土梁中的强度发展，应用了均方根偏差（RMSD）统计指标。观察到细菌混凝土梁对动态荷载具有更强的抵抗力。
