www.sefindia.org

[inchak at tatasteel.com]

Dear Mr. H.S.Rai

You have indeed raised a very valid point.

We did carry out elaborate pull out test for all sections with the embossed
part embedded in concrete. The results are tabulated below.
FOR 0.025 MM Slip (Specified Ratio 140%)

Size  Load Plain  Load TMT    Actual Ratio of Load for
(mm)     (Kg)             (Kg)               TMT / Plain bar (%)

8.00    125              450             360
10.00    120              210             175
12.00      290            470             162
16.00    610              940             154
20.00    650             1160             178
36.00    1280            3100             242


FOR 0.25 MM Slip (Specified Ratio 180%)

Size  Load Plain  Load TMT    Actual Ratio of Load for
(mm)     (Kg)     (Kg)         TMT / Plain bar (%)

8.00    310             1305             421
10.00    615             1400             228
12.00    1190            2270             191
16.00   1650             4030             244
20.00   3600             8630             240
36.00   6500            16250             250


It clearly shows that the actual bond strength is way above what is
required by the specification.

We have also carried out calculation of Ar values completely ignoring the
projected area provided by the embossed characters and taking into account
the transverse ribs on only one side. The calculated Ar values are also
well above what is required by the specification.

Trust this puts your doubts at rest.


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