Study of cracking in concrete by neutron radiography

Pugliesi, R.; Andrade, M.L.G.

doi:10.1016/s0969-8043(96)00229-1

Cited by 23 publications

(12 citation statements)

References 1 publication

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“…Typical NDT-modalities based on the ionizing radiation are radiography (X-ray, gamma-ray) [84], neutron radiography or tomography [85][86][87] and computerized tomography (CT) [88,89]. In addition, backscattering techniques have been used [90].…”

Section: Methods Based On Radiationmentioning

confidence: 99%

Electrical Resistance Tomography imaging of concrete

Karhunen¹,

Seppänen²,

Lehikoinen³

et al. 2010

Cement and Concrete Research

217

135

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Cracking and deterioration of concrete are the leading causes of a premature failing of reinforced concrete structures. To assess the condition of concrete, a variety of destructive and non-destructive testing methods have been developed. From these two methods, the non-destructive testing (NDT) is a more favorable (albeit more challenging) option since the tested target is left undamaged. The NDT modalities include acoustic, electromagnetic and radiation based techniques. In this thesis, the feasibility of electrical resistance tomography (ERT) for NDT of concrete is studied. In ERT, electric currents are injected into the target through electrodes that are are attached to the boundary of the target. The resulting voltages between the electrodes are measured and this boundary voltage data is then used to reconstruct the internal conductivity distribution of the target. The reconstruction of the internal conductivity distribution of concrete is expected to provide valuable information about the condition of the structure so that appropriate repairs can be taken in time. The difficulty in ERT, as is in any other diffuse tomography modality, is that the problem has a nature of an ill-posed inverse problem. This implies that the solutions of the problem are unstable and nonunique in the classical sense. As a consequence, extra attention must be directed to the mathematical modeling of the measurements as well as to the reconstruction methods. Furthermore, concrete is strongly heterogeneous material composed of cement matrix, aggregate and different chemical compounds that create a challenging target for electrical modalities. Previous studies have shown that ERT is a potential tool for NDT of concrete, but the quality of the reconstruction was not yet sufficient for practical applications. In this thesis, especially localizing reinforcing bars and crack identification are considered. To meet those aims, novel computational methods for the image reconstruction are developed. For the crack identification and localizing reinforcing bars, a novel adaptive meshing approach was developed. In the new approach cracks and reinforcing bars are modeled as internal structures. The results show that by employing accurate mathematical models and statistical inversion techniques based on the Bayesian framework, ERT can become an applicable tool for practical NDT of concrete.

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Section: Methods Based On Radiationmentioning

confidence: 99%

Electrical Resistance Tomography imaging of concrete

Karhunen¹,

Seppänen²,

Lehikoinen³

et al. 2010

Cement and Concrete Research

217

135

View full text Add to dashboard Cite

show abstract

“…These include acoustic based methods (acoustic emission and ultrasonic testing) [8][9][10][11]; electro imaging methods such as thermography, ultrasonic pulse velocity (UPV), and ground penetrating radar (GPR) [12][13][14][15][16][17][18][19][20][21][22][23]; radiography such as X-ray, gamma-ray, and neutron ray [24]; and fiber optics methods [24][25][26]. The major drawbacks of these techniques are that they do not provide in-situ (excluding fiber optic methods) and distributed sensing [9,25,26].…”

Section: Introductionmentioning

confidence: 99%

Progress in triboluminescence-based smart optical sensor system

Olawale

Dickens

Sullivan

et al. 2011

Journal of Luminescence

150

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“…This method requires good experience and sophisticated analysis to fulfil its potential performance. 4) Radiation attenuation techniques: These include X-ray system [5], gamma ray system [6] and neutron radiography system [7][8][9][10][11][12][13][14][15]. Their attenuations can be related to water content within the materials.…”

Section: Introductionmentioning

confidence: 99%

“…For instance, Pleinert [7] studied the moisture distribution in mortar under drying condition by means of neutron radiography with high resolution; Hassanein [8,9] also presented the possibility and successfully studied the water imbibition into different building stones using neutron radiography; Masschaele [10] studied fluid motion into porous sand and limestone in three dimensions visibly; and Ridgway [11] established the network absorption model based on the experimental water absorption data of red clay brick and white siliceous brick by neutron radiography. Pugliesi [12] has utilized neutron radiography to observe cracks in concrete. In China, Zhang and Zhao [13] also started applying neutron radiography to study water uptake into porous cement-based materials.…”

Section: Introductionmentioning

confidence: 99%

Visualization and quantification of water movement in porous cement-based materials by real time thermal neutron radiography: Theoretical analysis and experimental study

Zhang

Wittmann

Zhao

et al. 2010

Sci. China Technol. Sci.

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Water movement in porous cement-based materials is of great importance when studying their deterioration processes and durability. Many traditional methods based on mass changes, electricity or nuclear magnetic resonances are available for studying water transport in cement-based materials. In this research, an advanced technique i.e. thermal neutron radiography was utilized to achieve visualization and quantification of time dependent water movement including water penetration and moisture vapor in porous cement-based materials through theoretical analysis and experimental study. Because thermal neutrons experience a strong attenuation by hydrogen, neutron radiography exhibits high sensitivity to small amounts of water. A neutron transmission analysis for quantitative evaluation of raw radiographic measurements was developed and optimized based on point scattered functions (PScF). The determinations of the real time and space dependent water penetration into uncracked and cracked mortar samples, as well as the drying process have been presented in this paper. It is illustrated that thermal neutron radiography can be a useful research tool for visualization and quantification of water movement in porous building materials. The obtained results will help us to better understand deteriorating processes of cement-based materials and to find ways to improve their durability. thermal neutron radiography, visualization, quantification, water penetration, moisture diffusion, cement-based materials Citation:Zhang P, Wittmann F H, Zhao T J, et al. Visualization and quantification of water movement in porous cement-based materials by real time thermal neutron radiography: Theoretical analysis and experimental study.

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Study of cracking in concrete by neutron radiography

Cited by 23 publications

References 1 publication

Electrical Resistance Tomography imaging of concrete

Electrical Resistance Tomography imaging of concrete

Progress in triboluminescence-based smart optical sensor system

Visualization and quantification of water movement in porous cement-based materials by real time thermal neutron radiography: Theoretical analysis and experimental study

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