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Unconfined Compressive Strength(UCS) for stabilised subbase materials

Unconfined Compressive Strength(UCS) for stabilised subbase materials

Unconfined Compressive Strength(UCS) for stabilised subbase materials

(OP)
I'm carrying out cement stabilization on different gavel materials for use as stabilised subbase C1 by using different percentage of cement.The percentages used are 2.5%,3% and 3.5% of cement.The moulded specimens were cured for seven days in a water tight plastic bags and immensed in a water bath of a constant temperature of 25centigrades.The samples were then soaked in water fopr four hours prior to crushing.The very interesting phenomena here it that the test results show that the 2.5%of cement gave better strength than 3%cement. We have tried to repeat the tests precisely,but we have got the same results.According to my experience I could hope that the higher the cement the higher the strength to be achieved!What is the reasons for this!

RE: Unconfined Compressive Strength(UCS) for stabilised subbase materials

With such low cement contents, cement distribution within the sample is a problem.  Sometimes the distribution is good and you get good strength...sometimes it's not so good (inadequate mixing) and the strength suffers.

RE: Unconfined Compressive Strength(UCS) for stabilised subbase materials

  One case: The optimum of strength per dollar of mixed cement/soil was around 5-6% by dry weight for well graded granular soil with less than 6% passing #200 sieve. (75% portland & 25% flyash in Rita Ranch of Tucson, AZ).

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