Page 82 - Riem-Vol6_nº2

253 IBRACON Structures and Materials Journal • 2013 • vol. 6 • nº 2
L. P. PERLIN | R. C. A. PINTO
the edges of the object (MALHOTRA et al. [18]) was approximately
2.25 cm for the specimens tested here. Such a recommendation
was not followed, because if the readings at the edges were not
executed, the system of equations would be underdetermined
(Figure 4-a), making it impossible to obtain a single solution. Thus,
it was already expected that the readings taken at the edges of
specimens might suffer some interference that could reflect in the
resulting tomograms.
4.3 Results
After the experimental program has been concluded, the geometry,
Figure 12 – Production of specimens – (a,b) concreting – (c) demolding – (d) grid spacing
A
C
B
D
A B
Figure 13 – Positioning of 200 kHz transducers – (a) location of the measuring points
(b) measuriments in analised section