Cracks in concrete are inevitable and they can adversely affect the service life of structures. An efficient method to heal the cracks coupled with a reliable monitoring technique is of paramount importance. Standard crack healing materials are unable to penetrate thin cracks [1]. This paper presents an experimental demonstration of healing of fine cracks of around 0.6 mm using the bacterial based healing technique. Simultaneously, the evidence and efficiency of bacterial healing is investigated using advanced monitoring techniques. Ultrasonic signals passing through the healing area have been recorded and the waveform has been studied to interpret the condition of the crack. It has been validated through a series of water-tightness tests. The bacterial technique was able to heal the crack to the extent that no water was seen to permeate through the crack. The evidence of bacterial healing was confirmed through scanning electron microscopy and X-ray dispersion spectrum. It was found that the ultrasonic technique is able to monitor the progression of healing.

混凝土中的裂缝是不可避免的，并且可能对结构的使用寿命产生不利影响。一种有效的方法来修复裂缝，再加上可靠的监控技术，是至关重要的。标准的裂纹愈合材料无法穿透细小裂纹[1]。本文介绍了使用细菌修复技术修复约0.6 mm细裂纹的实验证明。同时，使用先进的监测技术研究了细菌治愈的证据和效率。记录了穿过愈合区域的超声波信号，并研究了波形以解释裂纹的状况。它已通过一系列水密性测试验证。细菌技术能够将裂缝愈合到一定程度，以至于没有水渗透到裂缝中。细菌愈合的证据通过扫描电子显微镜和X射线弥散谱得到了证实。已经发现，超声技术能够监测愈合的进程。