Problems faced in Conventional Method of Road Construction
• Need for huge quantities of Crushed aggregates
• Strict Mining Policies / Environment Norms
• Cost of Material shooting up, increasing construction costs
• Non Availability of material leading to delay
TerraZyme – A bio enzymatic soil stabiliser
• To minimize the problems faced, we introduce TerraZyme an
alternate tool for building roads
• TerraZyme, manufactured by Nature Plus Inc – U.S, (under
ISO – 9002 procedures ) is an excellent replacement for
metalling and solling.
• TerraZyme is a liquid extract from sugar molasses that
improves the engineering qualities of the soil like CBR values
and density and decreases the OMC, plasticity index of soil.
Benefits of using TerraZyme• Cuts construction cost by 10%-20%
• Higher CBR value / higher road strength: TerraZyme base
structures have a much higher CBR value.
• Lowers the maintenance cost by 30-50%.
• Saves construction time by 50%
• Pavement thickness is reduced by 5-10% in phase of trials
• Environment friendly and bio-degradable product.
• The product has been accredited by IRC
How does TerraZyme Work• Clay Water Effect – TerraZyme reduces size of double layer of clay,
thereby reducing swell in clayey in soils
• Cation Exchange – Thickness of double layer is reduced permanently, which reduces the water adsorbed by clay, which in turn reduces plasticity in clay and increases molecular structure of clay.
• TerraZyme stabilization effects – Organic cations have large flat structures approaching size of clay particles , which then neutralizes the negative charge of clay by covering it
• Other TerraZyme effects – It facilitates the removal of pore water leading to higher densities and reduced void percentages, leading to realignment of particles, thereby reducing permeability of soil
Research In India- CRRI Test Results
Improvement in Soak CBR Lab (Pondicherry Soil)
14
10.3
4.19
02468
10121416
Untreated 2 4Curing in Weeks
CBR
%
Improvement in ITS (Pondicherry Soil)
146
137
11486
020406080
100120140160
untreated 2 3 4Curing in w eeks
ITS
in K
Pa
Improvement in Fatigue Life
35065
32325
17851
80760
500010000150002000025000300003500040000
Untreated 2 4 7Curing in weeks
No.
of r
epet
itive
cy
cles
Test Results - CRRI
Research In India- College of Engg TrivandrumFig 16. Change of CBR over time for various samples
05
1015
202530
3540
4550
Sample w eek 0 w eek 1 w eek 2 w eek 4 w eek 6 w eek 8Time
CBR
(%)
Sample 1Sample 2Sample 3Sample 4Sample 5
Test Results – University of Bangalore
CLOHCHCISX
UCS Results – NITK Surathkal
0200400600800
10001200
0 2 4 6 8
UC
S (K
pa)_
Curing period in weeks
Laterite Soil
Dosage 1Dosage 2Dosage 3Dosage 4
0
200
400
600
800
0 2 4 6 8
UC
S (K
pa
Curing Period (Weeks)
Black Cotton Soil
Dosage 1Dosage 2Dosage 3Dosage 4
UCS and Quality
• relationship between UCS and the quality of the sub-grade soils used in pavement applications(Das 1994)
UCS (kPa) Quality of sub-grade
25–50 Soft sub-grade
50–100 Medium sub-grade
100–200 Stiff sub-grade
200–380 Very stiff sub-grade
>380 Hard sub-grade
Design Guidelines
• Based on AASHTO Structural Number for design of flexible pavements
• In this phase of trials, the reduction of crust thickness is limited to max of 2” as compared to SP 72 design template
Cost Comparison As per APSRRDA – Kadappa Circle
The cost savings range from 1.5 L per km 4 L per km depending on the design
As per Convetional Method of SP-72 As Per SR rate ( DPR ) Amt in Sq.mtGravel base 150mm 659.92 98.99WBM Grade 2 75mm 1821.21 136.59WBM Grade 3 75mmTotal Cost per m2 235.58
Cost Savings per M2 35.57Cost Savings per KM 142,261.13 Savings in % % 15.10
Cost Comparison As per APSRRDA – Kadappa Circle
The cost savings range from 1.5 L per km 4 L per km depending on the design
As per Convetional Method of SP-72 As Per SR rate ( DPR ) Amt in Sq.mtGSB 150mm 1106.75 166.01WBM Grade 2 75mm 1821.21 136.59WBM Grade 3 75mmTotal Cost per m2 302.60
Cost Savings per M2 102.59Cost Savings per KM 410,359.13 Savings in % % 33.90
Indian Work and Tests
• PWD Maharashtra• DRDA Sundergarh• PMGSY Karnataka• NH 66 – Chennai Circle• NH 4A – Goa• Wipro• Orchid Health Care• Sobha Developers• Mantri Group• Semac Consultants
• NITK Suratkal• Bangalore University• CRRI• Anna University• Shanmuga College of
Engineering
Roads Constructed using TerraZyme - India
Rural Road – After PavingThe road has undergone 4 monsoons
Roads Constructed using TerraZyme - India
Industrial Roads – Schwing Stetter
Treated Surface With Concrete Top
International Accreditations
• Pennsylvania Highway Department
• Canada PWD• Brazil Highway• PORIM• Thailand• Congo• Mexico• Japan
• World Bank (BIRF 3685 – PA)
• USAID• Brigham Young
University• Columbia University
World Bank StudyThe world bank study with multiple stabilizers across the world were tested in Paraguay, in which TerraZyme stood
first, based on which over 1400km were specified in Paraguay
Report MOPC / World Bank (BIRF 3685 – PA), March 2002
Paul Guitink, ( World Bank )
Ruben Brazetti ( National Department of Roads & Highways, Parana, Brazil )
Close up view of the Road. The Road presently caters to 1,300 commercial vehicles / day.
National Highway – 66 , Tamil NaduA Case Study
Comparison between Conventional and TerraZyme treated road.
TerraZyme treated road without Asphalt.
Conventional road with Asphalt.
Economic Benefits of using TerraZyme
• The road construction was cheaper by 30%
• The road was used for one year with heavy traffic without any black topping.
• The use of TerraZyme gives the opportunity to the government agencies to plan diversion roads without any black topping
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