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adding portland cement to soil

adding portland cement to soil

adding portland cement to soil

(OP)
Hello,

When adding portland cement to a silty or sandy material, what is the effect on the shear strength.  Obviously, the cohesion will increase, similar to a naturally cemented deposit but what happens to phi ?  

Does addding portland cement to soil only increse the cohesion and the frictional component remains essentially unchanged ?

OR ?

It would seem that as the cement content increases, the material would begin to behave more like traditional concrete (stress independant) rather than a frictional material.  Therefore, the strength of the soil would be determined using a test similar to how concrete is tested, unconfined compressive strength.

Your comments and/or references to technical publications would be appreciated.

RE: adding portland cement to soil

Hi Drt.

I did recently soil cement mix.
4.5% cement content mixed with sandy silty soil gave me 200KPa cohesion and frictional angle 35 degrees. Effective value from CIU test.

80 kilogram of cement mixed with 1 cubic meter of this soil gave me UCS 2 Mpa.

RE: adding portland cement to soil

Sorry, forgot to tell you that samples were compacted to 95% MPD and moisture content was 11 %.

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