Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Computer tomography of reinforced concrete
At present there are no satisfactory evaluation techniques for assessing the remaining life of concrete structures such as bridges and highways. This chapter will discuss two non-destructive methods that are being developed for evaluating reinforced concrete in a reliable, accurate, and timely manner: the use of X-rays and microwave tomography. Penetrating X-rays are nondiffracting waves; i.e., they propagate in a straight line. Therefore, the tomographic reconstruction occurs when data are not available from all directions, leading to a 'limited-angle' tomography where complex computer modelling is required to complete the reconstruction. Examples of this condition will be presented using PSIRRFAN, a new computer program which minimizes the artefacts due to the lack of data. Unlike X-rays, microwaves are diffracting waves; i.e., they do not propagate along linear path lines in a medium containing heterogeneity's. Thus, the interaction scheme between microwaves and matter requires using Maxwell's equations in their whole complexity. Laboratory and field results highlight the adequacy and limitations of these techniques. In addition, a new microwave camera capable of locating the position of the reinforcement in a concrete structure will be discussed.
Computer tomography of reinforced concrete
At present there are no satisfactory evaluation techniques for assessing the remaining life of concrete structures such as bridges and highways. This chapter will discuss two non-destructive methods that are being developed for evaluating reinforced concrete in a reliable, accurate, and timely manner: the use of X-rays and microwave tomography. Penetrating X-rays are nondiffracting waves; i.e., they propagate in a straight line. Therefore, the tomographic reconstruction occurs when data are not available from all directions, leading to a 'limited-angle' tomography where complex computer modelling is required to complete the reconstruction. Examples of this condition will be presented using PSIRRFAN, a new computer program which minimizes the artefacts due to the lack of data. Unlike X-rays, microwaves are diffracting waves; i.e., they do not propagate along linear path lines in a medium containing heterogeneity's. Thus, the interaction scheme between microwaves and matter requires using Maxwell's equations in their whole complexity. Laboratory and field results highlight the adequacy and limitations of these techniques. In addition, a new microwave camera capable of locating the position of the reinforcement in a concrete structure will be discussed.
Computer tomography of reinforced concrete
Monteiro, P.J.M. (Autor:in) / Pichot, C.Y. (Autor:in) / Belkebir, K. (Autor:in)
Materials Science of Concrete, Vol. 5 ; 537-572
1998
36 Seiten, 22 Bilder, 40 Quellen
Aufsatz/Kapitel (Buch)
Englisch
Investigations with reinforced concrete tomography
| Tema Archiv | 2008
Computerized Tomography Analysis of Reinforced Concrete
| Online Contents | 1993
Computed tomography assessment of reinforced concrete
| NTIS | 1991
Computed tomography assessment of reinforced concrete
| Tema Archiv | 1992
Computed Tomography Assessment of Reinforced Concrete
| British Library Online Contents | 1993