Stabilization of first 6 inches

[Rubina Shaikh]

> On Fri, 23 May 1997, Marcos O. Camargo wrote:
> 
> > Can one use cement-stabilized cob for the first 6 inches above
> > ground?  Will a cement, sand, clay mix withstand humidity and frost?
> > Can I use this mixture instead of a course of rock?  Actually could
> > adobe bricks be made of this mixture and used as the first course?
> 
As long as using the cement for soil stabilisation , we have to 
analysis that how much amount of clay in soil , then we would be able 
to decide weither the cement would be suitable...
high plastic clay is rarely suitable for cement or stabilisttion some 
sand is required to aid to correct its particles size distribution.
Lime would be suitable for high plastic clay... using lime .. it 
takes time become more strong , lime stabilised soil increases its 
strength with time period...
if its difficult to do other tests than .. shrinkage test is possible 
on the site.. there is perscrbed amount of stabiliser with percentage 
of linear shrinkage..e.g
``````````````
Shrinkage            soil       cement        Lime
less than 15mm, soil is not suitable for stabilisation because of 
insufficient amount of clay
15-30mm    : 1 part of soil and 20m part of cement or 7 parts of lime
30-45mm :1 part of soil 15 of cement or 6 parts for lime
45-60mm: 1 part of soil 12 parts of cement 
more than 60mm shrinkage insuffiecent amount of sand.. sand need t5o 
be add....

Generally some book writes that almost all types of soil suitable for 
cement stabilisation except the soil which have high percentage of 
organic matter in soil and salt rich soils also not suitable for 
cement . cement could be used woith high percentage of clay in soil  
but for this you need high percentage of cement ...

Using Bitumen is also alternatives water resistance or controlling 
moisture migration.... but doesn'nt help for increasing strength of 
the soil... 
Note : please be care ful during using lime.. again lime have 
different types of lime.. it s depend on availability... overall 
hydraulic lime would be recomended...
 
please be free to discuss about stabilisation with me.. I want to 
increase my knowledeg regarding stabilisation..


Rubina Noor Shaikh         45E Kelvinhaugh street
Postgrad student           Glasgow G3 8PE U.K.  
Mackintosh School of 
Architecture
University of Glasgow
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