Experimental study on structural health monitoring of RC columns using self-diagnosis materials

Abstract

The authors have been continuously conducting a series of research works on the development of the fiber reinforced composites as self-diagnosis materials. The function to detect damage is based on the property of carbon materials as a conductor of electricity. The conductive fiber reinforced composite, which is the glass fiber reinforced plastics added carbon particles for electrical conductivity, has been confirmed to possess excellent sensitivity as a self-diagnosis materials. In this study, a self-diagnosis material with the ability to memorize damage history has been applied. Irreversible resistance changes dependent on the strain histories of the composites were utilized to achieve this ability. The authors have also developed an electrically conductive film sensor bonded on the concrete surface to detect cracks and measure crack width. The specimens of the reinforced concrete bridge pier columns were tested under quasi-static cyclic lateral loading. The performance of the proposed self-diagnosis materials to detect damage to concrete structures is evaluated through confirmation of the relationship between the extent of damage and the variation of electrical conductivity of self-diagnosis materials. On the basis of the obtained experimental results, the applicability of selfdiagnosis materials to structural health monitoring for concrete structures are discussed in detail, and the practical monitoring techniques for structures are proposed.

Electrostatic self-assembled carbon nanotube/nano carbon black composite fillers reinforced cement-based materials with multifunctionality

“…resistivity strain gauges, optic sensors, piezoelectric ceramic, shape memory alloy and fiber reinforced polymer bar, etc.) into or onto the concrete structures [4][5][6][7][8]. However, these sensors have some drawbacks including low sensitivity, high cost, short lifespan and poor antiinterference performance, which make it difficult to utilize monitoring technology to a large scale in the realistic projects [9,10].…”

Research Progress in Environmental Response of Fiber Concrete and Its Functional Mechanisms

“…erefore, concrete deformation, cracks, and damage can be monitored by measuring the resistance [82]. Scholars used fiber-reinforced composites to detect the surface cracks of the bridge in the concrete, and the stress intelligent response phase is carbonaceous-glass fiber [81]. It can be seen from Figure 15 that the concrete resistance changes linearly with the crack width.…”

Embedded sensor system to detect chloride permeation in concrete: an overview

“…Self-diagnosing polymer composite contains conductive materials such as graphite powder, carbon black which detects the strains, cracks and damage in concrete by measuring electrical resistance [55][56][57][58]. This polymer composites are embedded in concrete and sensing materials themselves work as sensors to detect the chloride ion and monitor the corrosion process [59,60].…”