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IBRACON Structures and Materials Journal • 2012 • vol. 5 • nº 5
Fatigue lifetime of a RC bridge along the Carajás railroad
studies that point to other factors that affect these correlations out-
lined by the calibration curves. According to Evangelista [5] factors
as the amount of cement, aggregate nature, maturity and moisture
content, carbonation and surface finish, can increased propagation
of errors in the results. The concrete strength was estimated based
on the arithmetic average of the resistances of nine points of each
study area (0.10 mx 0.10 m), according to NBR 7584 : 1995 [6].
Figure 11 shows the application of sclerometer and arrangement
of the points on the deck slab and stringer.
2.2 Destructive tests
Tests for determining the depth of carbonation in structural el-
ements of the OAE using a solution with the chemical indica-
tor phenolphthalein were performed “in situ”. After opening of
the windows in 0.05 m thick concrete coating, the tests were
conducted in various structural elements and showed that the
concrete is at a satisfactory level of alkalinity, with no visible
sign of corrosion. Figure 12 shows the final appearance of the
concrete after the alkalinity testing (pink color indicates the
Figure �� � ��lerometry testing on slab (left) and stringer (right)
Figure �� � Final as�ect of t�e stringer�s
concrete after alkalinity testing
Figure �� � �oncrete testimony extraction