Construction of road with Geo-Textiles A presentation by : ER. R.K. KANSAL, Executive Engineer.

GEO-SYNTHETICS: These are Polymerized Hydro Carbon products primarily produced during refining of Crude Oil in various refineries and during Distillation of Charcoal.

There are various types of Geo-synthetics available in the market detailed as under: Geo-Synthetics 1.Geotextiles 2.Geogrids 3.Geonets 4.Geomembranes 5.Geosynthetic Clay Liners 6.Geofoam 7.Geocells 8.Drainage / Infiltration Cells 9.Geocomposites 10.Paving Fabric & Glass grids

Functions of geo-synthetics Products/ Applications Geo- textiles Geo-grids / Geonets Geo- composites GabionsGeopipesGeocells Filtration Drainage Separation Reinforcement Barrier protection

Available capacity of Geo Textile in INDIA Available capacity of Geo Textile in INDIA

 Propagation of cracks in upper layer becomes almost nil.  Moisture barrier – the Geo Textile used is non woven, non biodegradable and waterproof. Even the Geo textile is not wetted by water and hence is perfect moisture barrier.  No rain water crosses the barrier of Geo Textile and the water percolating from surface drains off along the Geotextiles. ADVANTAGES OF GEO TEXTILES.

In case of saturation of sub-grade and subsequently the bases and sub-bases due to excessive rain fall or flooding, the water does not rise in the bituminous layers due to the barrier of Geo Textile. Hence the bituminous layers laid over the Geo Textile are protected. During excessive floods and overtopping of the crust by flood water the erosion of the road is prevented to the large extent due to presence of Geo Textile in the crust Due to non cracking of the road with the use of Geo Textile, the maintenance cost is reduced to large extent and the life of the bituminous courses is enhanced considerably. ADVANTAGES OF GEO TEXTILES.

 The cost per sq. m for 150 GSM Geo-textiles is around Rs.40 per sqm.  The cost per sqm. for surface dressing is around Rs.75 per sqm.  There is saving of Rs.35 per Sqm. If Geo-textiles is used instead of surface dressing to arrest cracks from propagating to wearing course.  For 3.66 meter wide 1 km of road the cost of laying of Geo-textiles is around Rs.1.45 lacs and for surface dressing, the cost is Rs.2.75 lacs. Cost implication of Geo-textiles.

Besides the above cost implication the use of Geo-textiles in road construction has other remarkable advantages like: i.Acting as a moisture barrier. ii.No water infiltrate the bases and sub-bases during rains. iii.Similarly no water rises to bituminous layers if the subgrade bases and sub-bases are saturated and capillary action is completely cut off. Cost implication of Geo-textiles.

Functions in Roads

IRC SP 59 and Section 700 of MORT&H approves the use of GEOSYNTHETICS in highway pavements and are as under: IRC- SP-59 The relevant sections of these codes are reproduced as under:

IRC SP 59 and Section 700 of MORT&H approves the use of GEOSYNTHETICS in highway pavements and are as under: MoRT&H Section th Revision

IRC SP 59 and Section 700 of MORT&H approves the use of GEOSYNTHETICS in highway pavements and are as under: MoRT&H Section-700 5th Revision

Construction of 200m stretch from RD 8120 to 8320m of Matheri Sheikhon Naneola road with GEO-SYNTHETICS Case Study of

 This road was widened and strengthened to 5.5m under PMGSY scheme during  Since 2006, no major / minor repair has been done on the road except pot hole / patch work repair. At present the road is having wide cracks and strengthening of the road has been approved with 50mm BM + 20mm PC with B type seal coat. A provision of surface dressing has been taken in the estimate to cover up the extensively cracked portions  The CBR of the sub-grade is 3% and the CVD is The existing crust of the road is 545mm, which includes 50mm BM + 20mm PC with seal coat. The rest are granular layers. Salient features of the road:

 The Geotextile has been used over the existing bituminous wearing course without doing any repair of existing cracks in RD 8120 to  The Geotextile has been provided by M/s JPD Precisions, Kala Amb. The raw material used for production of Geo Textile is poly propylene supplied by IOC Panipat refinery.  The Geotextile has been got tested from IOC Panipat refinery as per requirement of MoRT&H Section – 700.  The results of the sample supplied by IOC fulfill all the requirement of MoRT&H and are as follows: Salient features of the road:

The requirement and outcomes of Test results are as under: REQUIREMENTS

RESULT:

The sequence of construction of test stretch from 8120 to 8320 is depicted below through actual photographs of the site shown below: Existing condition of the road 1.Widely cracked 2.No treatment of cracks carried out. Cleaning of road with compressor. Tack coat with sprayer. Spreading of Geotextile after tack coat and rolling (existing road must have sufficient camber & no wrinkles are to be left). Laying of bituminous layers. Final product.

Existing condition of the road SEQUENCE OF CONSTRUCTION

Existing condition of the road SEQUENCE OF CONSTRUCTION

Existing condition of the road Existing condition of the road Cleaning of road with compressor Cleaning of road with compressor SEQUENCE OF CONSTRUCTION

Tack coat with sprayers SEQUENCE OF CONSTRUCTION

Tack coat with sprayers SEQUENCE OF CONSTRUCTION

Spreading of Geotextile after tack coat and rolling (no wrinkles are to be left). SEQUENCE OF CONSTRUCTION

Spreading of Geotextile after tack coat and rolling (no wrinkles are to be left). SEQUENCE OF CONSTRUCTION

Laying of bituminous layers. SEQUENCE OF CONSTRUCTION

Laying of bituminous layers. SEQUENCE OF CONSTRUCTION

Final Product SEQUENCE OF CONSTRUCTION

Final product