Highway Research Record No. 39 - Indian Roads Congress

7. Feasibility Study of a patented Commercial
soil stabiliser
Keywords: Soil stabilisation, silt and Clay
Date of Start: Feb. 2011
Date of Completion: March. 2012
CSIR- Central Road Research Institute, New
Delhi (R)
Scope and Objectives
•
•
To investigate the efficacy of a commercial soil
stabiliser for stabilization of different types of soils
used in road construction.
To carry out this study on four types of soils -
Coarse grained soils (Badarpur sand and Granular
sub base soil) and fined grained soils (Delhi silt and
Clayey soil).
Methodology
In order to assess the efficacy of Patented commercial
Stabiliser via-a-vis Cement (a conventional soil
stabilizer), two types of coarse grained soils (Badarpur
sand and Granular sub base material) and two types
of fine grained soils (Delhi silt and Clayey soil) were
stabilized both with cement and commercial soil
stabilizer separately. Strength gain was determined in
terms of Unconfined compressive strength and CBR.
The durability tests were also conducted to assess the
performance of stabilized soils under the wetting and
drying cycles which simulate the environment condition
in field.
Interim Conclusions/Conclusions/Supporting Data
Based on laboratory data, it was found that in case
of all the four types of soils as mentioned above, the
unconfined compressive strength of soil stabilized
with 2, 4 and 6% cement gives higher strength as
compared to with 2, 4 and 6% commercial stabiliser
for 7, 14 and 28 days curing period. The increase in
soaked CBR value with 2%, 4% and 6% cement and
commercial stabiliser was also evaluated. It was found
that CBR values increase significantly with the addition
of both cement as well as commercial stabiliser. From
durability test, it was concluded that silty soil sample
stabilized with 2% Cement as well as commercial
stabiliser failed, indicating necessity for higher dosage
of stabiliser. Accordingly, Delhi silt stabilised with 4 and
6% cement and commercial soil stabilizer, satisfied
durability test criteria as stipulated in ASTM D559 and
in IRC :SP:98-2010. In case of Badarpur sand samples
stabilized with 2%, 4% Cement and 2%, 4% and 6%
commercial stabiliser failed in durability test. However,
Badarpur sand sample stabilized with 6% Cement
ROAD RESEARCH IN INDIA 2011-12 35
could pass the durability test. In case of clayey soil the
samples made with both cement as well as commercial
stabiliser could not satisfy the criterion as stipulated
in ASTM D559 and prescribed by IRC: SP:98-2010.
However in case of Granular soil it was concluded that
soil sample stabilized with 2%, 4% and 6% Cement as
well as 2%, 4% and 6% commercial stabiliser could
pass the durability test.
Significance/ Utilisation Potential
Based on laboratory studies, it was concluded that
Delhi silt treated with both 4 and 6% cement as well
as commercial soil stabilizer, Badarpur sand with 6%
cement only and granular soil with 2%, 4% and 6%
cement as well as commercial soil stabilizer, can be
considered for its use for subgrade improvement as
well as in sub-base layer of a road pavement. However,
before recommending for large scale application, an
experimental section be constructed and monitored
over a period of time to assess the performance of
road.
Further information/Copy of report can be obtained
from
address: The Head, Geotechnical Engg. Division,
CSIR- Central Road Research Institute, New Delhi -
110025, Mobile: 9868858380, phone: 26832173,
Fax: 011-26845943, e-mail ID: vittal.crri@gmail.com
8. Feasibility Studies on Vedanta IPP Coal
Ash Samples for Road & Embankment
Construction
Keywords: Fly ash, bottom ash and pond ash,
clinker grinders
Date of Start: Nov. 2010
Date of Completion (Targeted): Nov. 2011
I.
Vedanta Group of Industries (S)
II. Central Road Research Institute, New Delhi
(R)
Scope and Objectives
•
•
•
To determine the suitability of pond ash for road
and embankment construction
Characterisation of different types of ash samples
produced at Vedanta Independent Power Plant
(IPP’)
Providing suggestions/recommendations regarding
their usage in road construction works
Methodology
Different types of ash samples produced at Vedanta
Independent Power Plant (IPP’) viz., fly ash, bottom