Highway Research Record No. 39 - Indian Roads Congress

angle of friction. A combination of WRP and cinder can
satisfy density requirements of the materials for the
embankment construction.
Significance/ Utilisation Potential
Interim results show that cinder waste material can be
used in embankment for road construction.
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
11. Suitability of Granular Materials for Capillary
Cut-Off
Keywords: capillary cut-off, Sub grade,
geotextile
Date of Start: July 2011
Date of Completion (Targeted): March. 2012
I.
II.
PWD, Jhajjar, Haryana.( S)
Central Road Research Institute, New Delhi
(R)
Scope and Objectives
To assess the suitability of locally available granular
materials, locally known as Tibba sand for the
construction of embankment, sub grade and capillary
cut-off.
Methodology
A stretch of about 4.2 km length of NH-71 near Jhajjar
in Haryana experiences frequent failures due to low
embankment height of the road and presence of an
canal adjacent to this road at this location. The subgrade
soil of this road gets saturated and subsequently it
results in failure. The water from canal saturates the
sub grade layer by capillary action. To rectify this
problem, it was decided that the height of embankment
be raised and a capillary cut-off layer be provided. For
this, locally available materials commonly known as
Tibba sand and GSB materials were investigated for the
construction of embankment, sub grade and capillary
cut-off. It was observed that Tibba sand may be used
for the construction of embankment and a mix of Tibba
sand and soil can be used for sub grade construction.
Interim Conclusions/ Supporting Data
Granular materials, available locally, did not satisfy the
required filter/drainage specifications for capillary cut-
ROAD RESEARCH IN INDIA 2011-12 37
off. However, these materials may be used along with
geosynthetic materials for construction of capillary cut.
Significance/ Utilisation Potential
Raising of the embankment height has now been taken
up based on CRRI recommendations.
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
12. Feasibility Study on Utilisation of
Phosphogypsum as Road Construction
Material
Keywords: Phosphogypsum, Fly ash, concrete
road, Bituminous mixes
Date of Start: April. 2011
Date of Completion (Targeted): June. 2012
I. M/s Paradeep Phosphates Ltd., Orissa,
India
II. CSIR- Central Road Research Institute,
New Delhi (R,I)
Scope and Objectives
In order to assess suitability of Phosphogypsum as a
road construction material, a laboratory study has been
taken up. The broad scope of work is as follows:
•
•
•
•
Characterization of Phosphogypsum
Characterization of locally available Soil /Fly ash
and Phosphogypsum mixes
Use of Phosphogypsum in concrete roads
Use of Phosphogypsum in Bituminous mixes of
flexible pavements.
Methodology
To carry out the study, Phosphogypsum samples
and locally available soil was collected. The locally
available soil is fine grained soil and clayey in nature.
Since fly ash is available in plentiful nearby, mixes of
phosphogypsum and fly ash at various proportions have
also been characterised. Physical and engineering
properties of phosphogypsum as such and mixes of
Phosphogypsum and soil/ fly ash have been determined
in CRRI laboratory. The properties determined include
specific gravity, particle size distribution, consistency
limits such as liquid limit and Plastic limit, OMC and
MDD, etc. The strength and engineering characteristics