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Hi; The CBR test as per the AASHTO method T 193 requires the rate of penetration of piston in to the sample at 1.3 mm/minute uniformly and continuously. When there is no load (without sample) this rate is maintained properly. When test started with a soil specimen compacted, the rate of...

Hi There is an equipment called "Light Drop weight Tester" , "Light Weight Deflectometer" from "HMP LFG" for the use of soil compaction monitoring, testing of foundation backfil and for determination of "soil bearing capacity", according to the manufacturer. If any of you have used it, 1...

Dear Ron Thanks for your reply. May be, I have not forwarded my question clearly. If so, I questioned "what sort of action to be taken if the repeated slump is also a "sheared slump?". No action proposed by the BS. I believe that the shear slump occurs due to less fines, poor grading of...

To my memory 38% oversize means we can not apply the Proctor test if the oversize quantity is more than 30%. I hope my memory is correct.

As per the BS for concrete, there is a slump called "SHEAR" slump and if such a slump occurs the test shall be repeated. If the repeated result is also a "SHEAR" what is the meaning or action to be taken. Please educate me. Kind regards.

It is given in the AASHTO "Standards" and "Test methods" both at the beginning of these books published in the past like 1980s. I have not seen new editions.

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...

As per the BS there are two types of coarse aggregates gradings specified. One is "single sized" and other is "graded" For Concreting, is it acceptable If coarse aggregate comply only with single sized grading and falls within the "all-in aggregate" limits once it is mixed with sand.

Dear Sirs. I am a Pavement / Materials Engineer working for organization called BCEOM, from France. Please educate me whether the use of rebuild tires (tires worn-off and repaired with a rubber coating)are permitted for Benkelman beam deflection testing or not. If not please write why. All...