“RBI Grade 81 – A Natural Soil Stabilizer” (A Cost Effective , Rapid, Environment Friendly Soil Stabilizer )

By

Alchemist Touchnology Limited, New DelhiJuly 2010

Road Building International (RBI) Grade 81

Natural Inorganic Stabilizer which Re-engineers & Modify the Properties of Soil to strengthen the same.

Developed by South African Army in the beginning of 90’s for Pavement Engineering Applications by RBI.

PropertiesPowder stabilizer Grey color Water solubility of 0.2/1000 Non-inflammable

Effectiveness of RBI Grade 81 with Different Types of Indian Soils

Untreated (UT)

Treated (T)

Type of Soil

CBR %UCS, kg/sqcm

( all results are with 4% Stabilizer) * 6%

CRRI IITKgp IITR IITM RAASTA CRRI IITKgp IITR IITM RAASTA

UT Clay 4 3 - 2 5 5 0 0 3T with

RBI Clay 25 78 - 22 42 15 19 14 14

UT Silt 8 - 13 - 10 4 - - 16T with

RBI Silt 198 - 114 - 32 32 - - 39

UT Sand 22 - - - 14 0.5 - - 5T with

RBI sand 53 - - - 143 7 - - 23

UT Gravel 30 - 90 - 34 3 5 -- 2.1T with

RBI Gravel 197 - 361 - 180 26 35 - 19*

Effectiveness of RBI Grade 81 with Different Types of Indian Soils

Untreated (UT)

Treated (T)

Type of Soil

PI (Plasticity Index) (%) FSI (Free Swell Index) (%)

Sample 1

Sample 2

Sample 3

Sample 4

Sample 5

Sample 1

Sample 2

Sample 3

Sample 4

Sample 5

UT Clay 18 11.5 29 24.2 46.4 16.6 20 33 61.5 53.8

T with RBI Clay 11.7 5.2 8.8 13.3 21.2 3.2 4.3 13 23.1 21.2

UT Silt 10.3 11.6 10.3 5.6 23 5 16.6 0 9.1 8.3

T with RBI Silt 5.4 6 2.3 1 10.6 0 0 0 0.8 2.1

Construction cost reduction by 10 – 30%

Construction time reduction by 30 – 40%

Drastically increases the strength

Treated soil is water resistant &

prevents damage to the road foundation

Reduces transport & earth-moving costs

by about 60%

Longer Durability

Reduces Maintenance Cost

Reduces leaching and contamination of

ground water

Reduces use of bitumen.

Reduces energy consumed in road

construction

Saves construction material like

Aggregates, Good soil

Saves non-renewables resources in

construction process

Reduces the Carbon Emission resulting

into carbon credits

Advantages of RBI Grade 81 Environmental Benefits of using RBI 81

Application Areas

Pavements Highways & Expressways Hill Roads; High Altitude

Roads Unpaved Roads Pothole Repair Cold Recycling Helipads; Airfields Hard Standing Ground Op Tracks Mule tracks

Bricks & Paver Blocks Low Cost Housing

Footpaths; Boundary

Walls

Construction Equipments

2. Dozer

1. JCB 4. Rotavator

5. Water Sprinkler

Pavement Design Catalogue

Sub-Grade CBR 2% (CBR 10% using RBI)

Trafficmsa

Thickness mm

Pavement Composition

Bituminous Surfacing Base Sub-Base

BC DBM

250 460 (200)

10 850 (540) 40 100 (50)

20 850 (565) 40 130 (75)

30 900 (580) 40 150 (90)

50 925 (600) 40 175 (110)

100 955 (630) 50 195 (130)

150 975 (650) 50 215 (150)

IRC Code References For Reducing Pavement Thickness

Rise in CBR from 2% to 10 %, There is saving of DBM by 42 % Saving in aggregates for sub base will be 57 % More than 50% saving in aggregate as per IRC:37- 2001

Conventional Technology RBI Grade 81 Technology

LayerLayer

Thickness(mm)

LayerLayer

Thickness(mm)

SDBC 25 SDBC 25

BM 75Aggregate+ 4% RBI Grade 81 150

WBM 75

WBM 75Soil + 4% RBI Grade 81 150

WBM 75

WBM 100 Soil + 2% RBI Grade 81 100

GSB 150

Saving in Pavement Thickness

GSB 150

Total Thickness 725 Total Thickness 425

Case Study : Reasi - Pauni Road, Katra, J & K

Savings : Case Study Reasi - Pauni RoadComparison Chart

Conventional Pavement RBI 81 Pavement

Taking Core of RBI Grade 81 Patch After 9 Months

Construction of Airfield Using RBI Grade 81

Altitude of about 13500 Ft. Temperature of -30o C to +30o C Design: One layer of 250 mm of Sub Grade stabilization

with 4% RBI Grade 81

Construction of Airfield Using RBI Grade 81

Landing and Takeoff at Nyoma Airfield Runway

Source: http://livefist.blogspot.com/2009/09/iaf-32-lands-at-nyoma-ladakh.html

Applications in Perma-Frost Condition

RBI 81 Treated SurfaceUntreated Surface

Application in Italy Quarry Road Truck Load 40 MT 3 Years without Maintenance

Low Cost Housing RBI 81’s innovative technology enables the use and recycling of local readily

available materials while creating string and easy to use earth blocks.Advantages Capacity Building and empowerment of local population (men and women) Creation of jobs in the field of block production and Construction Protection of the environment

Cold Recycling with RBI Grade 81

Quarry Road State : Karnataka Project Name : Quarry Road near Weigh Bridge Location : Kolar

Road Made Using Iron Ore Waste From Mines State : Karnataka Project Name : PWD Approach Road to BBH Mines Location : Chitradurg

Instead of soil from outside mines waste was used in construction

Highway Road in the Hills State : Jammu & Kashmir Project Name : Km 63.10, Jammu Poonch Highway Location : Tanda Bamla Section, Jammu

Desert Roads State : Rajasthan Project Name : Kota Sawai Madhopur Road, SH-33 Location : KM 17, Kota

Desert Roads (Contd) State : Rajasthan Project Name : Mawali Tali Bhuria Dhora Road

Nr. South Camp Location : Mahajan Ranges, Suratgarh

Village Roads (Contd) State : Orissa Project Name : PMGSY Rural Road Location : Village Dhamra

City Road State : Delhi Project Name : Connecting Road Near Air force

School & CSD Canteen, Officers Quarters Location : Delhi Cantt.

Off Site Mixing State : Karnataka Project Name : Campus Road Location : KGA, Bangalore

Some International Applications

Main road into city of Kigali - RwandaSecondary paved roads - KenyaHeavy traffic paved road – Israel

Access road to a construction site Israel

Access roads and drilling pad Angola 

Township roads - South Africa

Forest Road Forestry roads – The benefits of using RBI 81 are particularly self-evident

when building roads in a fragile natural environment. RBI 81 do not place an additional burden upon their precious natural resources

 

Alchemist Touchnology Limited Global Business Park, Tower B, Unit 003

Gurgaon- 122002,Haryana (India)

Phone No.: +91-124- 4980000

Fax. No.: +91-124- 4980088

RBI 81 RoadAsphalt Road