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Increased swell of soil sample during soaking for CBR test.

Increased swell of soil sample during soaking for CBR test.

(OP)

We use to soak CBR sample in the mould normally for 4 days and check the swell before testing. Can anyone tell me what is the limit allowed for swell for construction of Road Sub Base soil?

A Sub Base sample collected from the road section ,which was damaged immediately after construction indicated a swell value of 6 mm after 4 day soaking. Normal soil in other sections indicated swell value below 2 mm. Has this 6 mm value caused for the damages. Please help me by giving the reasons.
Thanks

RE: Increased swell of soil sample during soaking for CBR test.

Our DOT considers 5% unacceptable swell.

f-d

¡papá gordo ain’t no madre flaca!

RE: Increased swell of soil sample during soaking for CBR test.

If the sample swells during the test, it will swell in place as well. If I remember the dimensions correctly, 6mm would be close to the 5% limit f-d noted.

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