Tugas Akhir Sipil
Korelasi Antara Nilai Pantul Uji Hammer Dengan Kekuatan Sisa Pada Beton Eksisting
Non-destructive test (NDT) method is preferred due to its benefits in evaluating or assessing
the residual strength of structural elements of the building when the quality are questionable. Usually,
this is caused by workmanship errors, additional loading plan and weathering of building materials due
to age factor. In this study, hammer test, which was one of the NDT (non-destructive test) equipment,
was used to determine the rebound values and the compressive strength of concrete that have
experienced a decrease in load capacity. Compression testing machine (destructive test) was used to
provide a load on the specimens. The purpose of this study is to discover the correlation between
rebound values of hammer test with the residual strength on existing concrete. Another purpose is to
provide convenience for can be applied in the project so it can be indicated the extent of existing
concrete conditions and decrease of the compressive strength values against the residual strength.
Forty cube specimens of 150 mm x 150 mm were used in this test. Before testing, calibration
has to be performed on the hammer tool. The surface of the concrete has to be flattened using the
whetstone. The concrete being tested was normal concrete and high strength concrete.
The results obtained on normal concrete and high strength concrete showed that the greater the
load given by DT (destructive test), the smaller the rebound values obtained on hammer test. The
correlation between rebound values of hammer test with the residual strength of structure is obtained
using two trends of equation, are polynomial models of orde 2 and bilinier models. From these
correlations, it indicates the condition of the existing concrete, knowing the group of concrete damage,
and the extent of decrease in residual strength on the existing concrete can be seen in the graph
correlation that has been obtained.
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