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What would be the corrected rebound deflection if the rebound deflection obtained from BBD studies is 1.33 mm? The test was conducted at 35°C on sandy soil with 5% moisture content. The annual rainfall of the area is obtained as 1050 mm.

What would be the corrected rebound deflection if the rebound deflection obtained from BBD studies is 1.33 mm? The test was conducted at 35°C on sandy soil with 5% moisture content. The annual rainfall of the area is obtained as 1050 mm. Correct Answer 1.56 mm

There is no need to apply temperature correction because the test has been carried out at standard temperature. 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 the code can be used for sandy soils with annual rainfall < 1300 mm. From the graph, the correction factor is obtained as 1.17. Corrected Dc=Dc×correction factor Corrected Dc=1.33×1.17=1.56 mm

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