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What would be the corrected rebound deflection if the rebound deflection obtained from BBD studies is 1.38 mm? The test was conducted at 30°C on a clayey soil having a plasticity of 10% and a moisture content of 4.5%. The annual rainfall of the area is obtained as 1450 mm.

What would be the corrected rebound deflection if the rebound deflection obtained from BBD studies is 1.38 mm? The test was conducted at 30°C on a clayey soil having a plasticity of 10% and a moisture content of 4.5%. The annual rainfall of the area is obtained as 1450 mm. Correct Answer 2.57 mm

The temperature correction needs to be applied first and then the moisture correction on the temperature corrected value. Corrected Dc=Dc+(Standard temperature-field temperature)×0.01 Corrected Dc=1.38+(35-30)×0.01=1.43 mm The correction for moisture content has to be done by referring to the graphs provided in IRC 81:1997. The code can be accessed from the below link: https://archive.org The graph labelled as in the code can be used for clayey soils with PI < 15% and annual rainfall > 1300 mm. From the graph, the correction factor is obtained as 1.8. Corrected Dc=Dc×correction factor Corrected Dc=1.43×1.8=2.57 mm

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