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What is the value of maximum deviation in CBR for values up to 10% of CBR?

What is the value of maximum deviation in CBR for values up to 10% of CBR? Correct Answer 3.0%

Explanation

Following are the some of the important points recommended by the IRC for CBR method of design (IRC: 37-1970)

a) CBR tests should be performed on remolded soils in the laboratory. In situ tests are not recommended for design purposes.

b) For the design of new roads, the subgrade soil sample should be compacted to OMC to proctor density whenever suitable compaction equipment is available to achieve that density in the field, otherwise the soil sample may be compacted to the dry density expected to be achieved in the field.

c) In new constructions the CBR test samples may be soaked in water for four days period before testing.

d) At least 3 samples should be tested on each type of soil at the same density and moisture content.

e) If the maximum variation in CBR values of the three specimens exceeds the specified limits, the design CBR average should be average of at least six samples.

f) The specified limits of maximum variation in CBR are 3% for values up to 10% of CBR & 10 % for values of  30 - 60 %.

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