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ACCELERATED PAVEMENTTESTING FACILITY -
HEAVY VEHICLE SIMULATOR(HVS)RESEARCH PROGRAM
An Overview for
the delegates of70th Annual Session
of IRC, Patna, 2009
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The controlled application of a prototype wheel
loading, at or above the appropriate legal load
limit to a prototype or actual, layered, structural
pavement system to determine pavementresponse and performance
under a controlled,
accelerated accumulation
of damage in a compressed
time period
WHAT IS APTF
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Current pavement design methods
are based on laboratory characteri-
sation, field investigations, computer
simulations etc.
To substantiate, use is made of a full
scale Long Term PavementPerformance (LTPP) study under
trafficking and modeling
WHY APTF IS REQUIRED ??
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APTF bridging the gap betweenLab Designs & LTPP
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WHAT APTF CAN DO ??
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Increasing road transportation demand
Phenomenal rise in vehicle population accompanied by heavy axleloads and correspondingly higher tyre pressures
Grossly inadequate structural capacity & stage constructionpractices
Scarce funds for M & R for road pavements Nation loses over Rs.15,000 crores/year on account of excess VOCs
due to poor road conditions
Heavy capital investments are needed to maintain the road networkat a desired serviceability level in order to minimize total
transportation costs Lack of experience in designing pavements for heavy-duty traffic
corridors, policies/ strategies for their upkeep & rehabilitation &materials/ specifications
NEED FOR APTF
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Most cost effective/ optimal solutions for development &
maintenance of roads demands the use of proven new materials &
specifications, technologies and practices
Evaluation of on-road test tracks under normal traffic has inherent
shortcoming because of the longer time needed to obtain the
results, affecting the quality and usefulness of such data because ofrapid changes taking place in technology over time
Complete life-cycle evaluation is done in just 3-6 months time with
APTF as compared to 10 to 15 years required under normal traffic,
thereby allowing results to be used immediately.
Advanced facilities are being widely used since early eighties in the
UK, USA, South Africa, France, Australia, Finland, Denmark, Holland
and China for accelerated load testing of pavements
NEED FOR APTF..... Contd .
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Advance information on pavement performance
Evaluation of New designs, specifications, mixes and materials
Studies for anticipated traffic conditions
Greater control over uniformity and quality of construction
because of small size of test sections
Control over environmental factors such as pavement
temperature and subgrade moisture Simulated field conditions
Economical and ready to use technical solutions
Substantial savings with improvements in pavement design
procedures and maintenance practices Well targeted pavement research programme can be undertaken
Knowledge gained from APTF affects decision of road authorities
Determination of magnitude and timing of asset establishment
and preservation costs
ADVANTAGES OF APTF
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Applications of HVS/APTF
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The need for establishing a national facility
for accelerated pavement testing was firstidentified and discussed by IRC-HRB
Committee in 1990- 91 through a Base paper
on Test Track Research in India prepared by
CRRI
The IRC- HRBs Identification, Monitoring &
Research Applications (IMRA) Committeeconsidered the proposal brought out in the
base paper and efforts were started
Background of Indian APTF
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Establishment of Centralised National
Accelerated Pavement Testing Facility
(APTF)
To generate data similar to Long Term
Pavement Performance (LTPP) Studies
and to develop pavement deteriorationmodels for flexible and rigid pavements
for typical pavement structures
Objectives of CreatingAPTF Facility
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CRRIs HVS
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Feature Capability
Mobility Towable over long distances; self-propelled over shortdistances
Load Application Static & Dynamic Load Applications
Wheel Loads Mean Load : 36 - 88 kN ; Peak Load : 30 - 105.6 kN
Test Wheel (s) Single, Super-single, Dual (truck) or Aircraft (Airbus
4616)
Tyre Pressure Typically 560-690 kPa on roads ; Upto 1450 kPa on
airfields
Repetitions PerDay
Upto 32000 (Bi-directionally) ; Upto 16000 (Uni-
directionally)
Trafficked Length 8m (test area length 6m)
Trafficked Width Upto 1.5 m, depending on wheel configuration
Trafficking Pattern Variable
Features of Standard Mark IV+
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Typical HVS Load Levels
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Performance Various Pavement Specifications Impact heavy vehicles on pavements (axle load, tyre type and
pressure)
Evaluation non-standard materials
Processes (insitu stabilisation, emulsions, by-products, recycledmaterials, reflection crack retarders etc.)
Maintenance efficacy of treatments, intervention strategies
Low volume roads surface treatments
Construction quality, effect of mechanisation
Major Priority Areas of
Research for India
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Construction of a Test Strip within CRRI
Specifications conforming to MoRT&H
Verify the Design Life as envisaged
Attempt to rationalise IRC design method
Proposed Immediate Study
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