SoilTech Mk. III - 3rd Generation nano-polymer stabilization

    Treats the roads of Prestige Golfshire, Bangalore

    Prestige Golfshire

    SoilTech Mk. III - 3rd Generation nano-polymer stabilization
    Golfshire is a super-premium residential project in Bangalore, comprising luxury villas, a 18-hole PGA standard golf course, a large convention centre with seating capacity of 5000, and a 5-star hotel. The project is spread across 320 acres on Nandi Hill Road, which is 15 minutes-drive from Bangalore International Airport.

    Prestige Estates decided to use SoilTech to treat the roads at the new Golfshire project. SoilTech was selected because of its high-speed construction characteristics and superior quality. Prestige’s Project Manager Mr. Hara Kumar said that by using SoilTech, the budgeted cost of the project was reduced by 25%.

    The total arterial road requirement of the project was 7.5 km in length with two carriageways of 7.5 metre average width each. The project, which started in August 2008 during the monsoon season, was completed and handed over to the developer by November-end, 2008.

    70,000 litres of SoilTech was used. The standard process, as recommended for the usage of polymer-based soil stabilizer, was followed at all levels. It included:
    • Test Reports prior to designing
    • Designing
    • Construction Methodology
    • Construction Equipment required
    • Tests undertaken after 10 days and 90 days of stabilization
    Design process

    Designing for the pavements was undertaken based on characteristics of the soil, life of the road, expected traffic, and its composition.

    Material Design: The required characteristics of soil for the usage of polymer-based soil stabilizer with dosage of 0.5 percent of the dry weight of the soil include Plasticity Index (PI) of the soil to be between 5 and 15 and CBR of more than 5.

    If the soil does not meet the above criteria, the soil is modified by addition of clay or aggregate. Though the CBR of the soil was good, the PI was not within the required range as it had more clay content. The PI was brought down by addition of aggregate. The soil and aggregate mix was to be 80% soil and 20% aggregate. The composition of aggregate was 30% 20 mm metal, 30% 12 mm metal and 40% quarry dust.

    SoilTech Mk. III - Design Process

    Pavement Design

    There was one common specification including design life of 6MSA and expected traffic of 3000 PCU. Based on this, the pavement was designed as 150 mm thick with dosage of stabilizer being 1.5 liters per sqm.
    • Depth – 150 mm
    • Length – 7-5 km
    • SoilTech polymer – 1.5 litres p/m2
    • Material used – insitu plus 20% imported aggregate
    • Traffic Volume 20Msa
    • Control CBR <5
    • Stabilized CBR >122
    • Completion Time 60 days.
    Seal – unsealed for 3 years then 30 mm BC

    Construction Methodology

    Construction methodology was devised, based on the design process and included the following steps:
    • Pavement was outlined and pegged to maintain the alignment and levels
    • Soil was spread and modified; it was ripped after modification
    • Admixture of soil stabilizer and water was added to the ripped surface to reach 1% above OMC and mixed to evenly distribute the admixture
    • Profiled and compacted.
    SoilTech Mk. III - 3rd Generation nano-polymer stabilization

    Construction Equipment used
    • Hydraulic motor grader with ripper
    • Tractor with attached cultivator
    • Water tanker with attached sprinkler and carrying capacity of 4000 liters
    • Smooth drum vibratory soil 10-ton compactor
    • Backhoe loader for material handling and miscellaneous works
    The construction methodology was strictly followed and the above mentioned equipment were efficiently utilized to complete the project in three months during the monsoon season.

    The Results

    Field CBR tests were undertaken after 100 days of preparation of pavement. The average CBR was found to be 85.

    The client was fully satisfied and opted for using polymer-based soil stabilizer in another project as well.

    The stabilized layer did not show any wear and tear after 9 years of extensive construction activity. In 2012, Prestige started laying concrete over the stabilized layer. The thickness of the layer was 100 mm.

    Benefits of Soiltech Mk. III stabilizer
    • Utilizes existing road construction equipment
    • Faster to construct
    • Constructed according to international and local standards
    • Meets and exceeds all CBR/UCS strength requirements
    • Lower carbon emissions
    • Lower cost
    • Pavement flexibility means less maintenance and reduced costs
    Polymer Applications
    • Stabilisation of roads, parking lots and golf pathways
    • Stabilizing bunker walls
    • Bunkers – keep soils separated
    • Lining and sealing of dams
    PolySeal Dam Liners

    PolySeal is a cost-effective spray-on dam liner. The earthen dam is lined with a geotextile and then three coats of PolySeal are sprayed over the lining.
    • 10-year UV warranty
    • Environmental-friendly for fish, water-fowls and plants
    • Water is drinkable
    • Quick application
    • Elastomer with good tensile strength.

    NBM&CW November 2017

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