Question
Download Solution PDFSelect the correct option for the given statements.
Statement 1: If CBR for 5 mm exceeds that for 2.5 mm, the CBR test should be repeated.
Statement 2: If identical results follow, the CBR corresponding to 2.5 mm penetration should be taken for design.
Answer (Detailed Solution Below)
Detailed Solution
Download Solution PDFConcept:
CBR Test:
- The California bearing ratio test is penetration test meant for the evaluation of subgrade strength of road and pavements. The results obtained by these tests are used with the empirical curves to determine the thickness of pavement and its component layers.
- This is the most widely used method for the design of flexible pavement.
- Generally CBR value is calculated at 2.5 mm and 5 mm penetration.
- The CBR value at 2.5 mm penetration will be greater than the CBR value at 5 mm penetration and in such a case the former will be taken as the CBR value.
- If CBR for 5 mm exceeds that for 2.5 mm, the test should be repeated. If identical result follows, the CBR for 5 mm penetration should be taken for design.
Last updated on May 28, 2025
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