El sistema Spectra de Tensar entrega a los constructores una forma innovadora de reducir los costos, tanto de agregados, como de asfalto; además, aumenta el valor y resistencia del producto final en la construcción de una carretera. Emin Sistemas Geotecnicos.

1. spectra™Pavement
optimisationsystem

2. 2 3
The Tensar Spectra System exploits the proven performance of
a mechanically stabilised layer of aggregate incorporating TriAx
geogrids. The system comprises of the following components:
Tensar mechanically stabilised layer (msl)
Granular layers stabilised with Tensar TriAx geogrids will
perform as a composite due to the interlock mechanism that
develops between the aggregate and the stiff geogrid structure.
This geogrid/aggregate composite is known as a Tensar MSL.
DESIGN TOOLS
The performance properties of the Tensar mechanically
stabilised layer can be included in pavement analysis allowing
designers to benefit from:
˴˴ AASHTO 1993 design methodology
˴˴ Life cycle cost analysis assessment (LCCA)
˴˴ Environmental assessment in terms of carbon footprint (CO2
)
˴˴ Performance based system specifications
The Tensar Spectra Pavement Optimisation System Reducing Construction Costs and Longer Term Maintenance Needs
Asphalt
Granular Subbase
Subgrade
Aggregate Base
Tensar MSL
Aggregate Base
Tensar TriAx®
Geogrid
The US Corps of Engineers Engineering and Development Center performs full scale accelerated pavement tests on the Tensar MSL.
˴˴ The Tensar Spectra System delivers life cycle cost
savings based on extending the long term service
life of the pavement structure
˴˴ Tensar has tools available to allow engineers
to compare pavement options with different
construction costs and performance expectations
Tensar has carried out years of laboratory research and numerous full scale tests
to evaluate the stabilisation effect of Tensar geogrids in flexible pavements.
Large reductions in aggregate fill can be achieved (up to 50%) without
compromising the road performance.
Increased traffic life without increasing pavement layer thickness.
The primary life cycle costs of a flexible pavement
include initial construction costs plus periodic
rehabilitation and maintenance costs, offset by the
pavement’s salvage value at the end of its design life.
Costs are calculated on a present worth of cost (PWOC)
basis, which discounts future costs to current dollar
value to compare costs accurately over a lifetime.
IC = Initial Construction Cost
RC = Rehabilitation Cost
MC = Maintenance Cost
SV = Salvage Value
Cost
Time
End of
Design
Life
Life Cycle Costs
IC
MC
RC RC
MC MC MC
SV
INCREASED PAVEMENT LIFE
reduced life cycle cost
Reduced pavement thickness
The adoption of the Tensar Spectra System can extend
the service life of a road and offer benefits in terms of:
˴˴ Increased time between maintenance operations
˴˴ Ability to carry higher traffic load without increasing
layer thickness
The Tensar Spectra System has been shown to reduce
overall pavement layer thickness by as much as 50%
whilst maintaining performance targets.
By reducing the quantities of aggregate base and/or
asphalt required in the final pavement construction,
benefits can be demonstrated in terms of:
˴˴ Cash savings in the delivery, placement and
compaction of aggregate and/or asphalt materials
˴˴ Carbon savings in the extraction, delivery and
installation of aggregate and asphalt materials
The Tensar Spectra Pavement Optimisation System provides the tools and confidence to pavement design engineers to optimise their
projects to suit individual customer or project requirements and demonstrate the increased value available with this proven technology.
Non-stabilised
Tensar mechanically
stabilised layer
Same thickness - increased traffic loading
Non-stabilised Tensar mechanically stabilised layer
Tensar TriAx geogrid
Pavement Optimisation
with the Tensar®
Spectra™ System
The Tensar Spectra System uses the improved
performance properties of a Tensar mechanically
stabilised layer in whole pavement construction
to give designers an innovative way of reducing
both aggregate and asphalt costs and increasing
value in road construction.
SpectraPave4-PRO™
The SpectraPave4-PRO software will allow the
generation of designed pavement structures with
options available to engineers in terms of layer
thickness and pavement life to yield optimised cost
and carbon savings.
Applying Tensar's Spectra System, life cycle
costs can be reduced by:
˴˴ Reducing initial construction costs (IC)
˴˴ Increasing pavement performance to reduce
maintenance (MC) and rehabilitation costs (RC)
˴˴ Increasing end of life salvage value (SV)
research and performance testing
The enhanced performance properties of stabilised layers
incorporating Tensar geogrid have been the subject of extensive
research including the use of full scale accelerated pavement
facilities at the US Corps of Engineers and the University of
Illinois in the USA. This research is in keeping with AASHTO's
endorsement of quantifying the benefits of geosynthetics in
pavements with full scale performance data (Ref: AASHTO R50-09).
This extensive investment in research has allowed the
development of Tensar stabilisation factors that represent the
influence on the whole pavement of Tensar TriAx geogrids in an
aggregate base.
STABILISATION
The European Organisation of Technical Approvals (EOTA) define
stabilisation as the beneficial consequence on the serviceability
of an unbound granular layer via the inhibition of the movement
of the particles of that layer under applied load. This is the result
of the mechanical effect of confinement on an aggregate layer,
resulting from the mechanism of interlock provided by a stiff
geogrid structure. (EOTA Technical Report TR041).

3. Your local distributor is:
Contact Tensar or your local distributor to receive further
literature covering Tensar products and applications.
Also available on request are product specifications,
installation guides and specification notes.
The complete range of Tensar literature consists of:
˴˴Tensar Geosynthetics in Civil Engineering
A guide to products, systems and services
˴˴Subgrade Stabilisation
Mechanically stabilised layers for roads and trafficked areas
˴˴Asphalt Pavements
Reinforcing asphalt layers in roads and trafficked areas
˴˴TensarTech® Earth Retaining Systems
Bridge abutments, retaining walls and steep slopes
˴˴Railways
Mechanical stabilisation of track ballast and sub-ballast
˴˴Foundations Over Piles
Constructing over weak ground without settlement
˴˴Basal Reinforcement
Using Basetex high-strength geotextiles
˴˴TensarTech® Plateau™
Load transfer platform system over piled foundations
˴˴TensarTech® Stratum™
Cellular foundation mattress system for foundations
with controlled settlement
˴˴Erosion
Controlling erosion on soil and rock slopes
Tensar International Limited
Units 2-4 Cunningham Court
Shadsworth Business Park
Blackburn BB1 2QX
United Kingdom
Tel: +44 (0) 1254 262431
Fax: +44 (0) 1254 266867
e-mail: info@tensar.co.uk
tensar-international.com
Copyright © Tensar International Limited 2014
Printed August 2014, Issue 3, SDA: 777580
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Q 05288
ISO 9001:2008
EMS 86463
ISO 14001:2004
ETA 12-0529,0530,0531
Tensar TriAx geogrids have been awarded European Technical Approval for the function of stabilisation of unbound layers as defined in
European Technical Report TR041 and in accordance with CUAP 01.02/10 4.