SERVICES:
STRUCTURAL TESTING
Data Collection Ltd.
New Zealand
providers of innova ve technology and services for measuring and managing roads
© 2011 Data Collec�on Ltd.
Post: PO Box 348 | Motueka 7143 | NEW ZEALAND Office: 8C Bentinck Street | New Lynn | Waitakere |
Auckland 0600 |NEW ZEALAND
Ph: 0800 222 404 Fax: +64 9 827 7704 E-mail: [email protected] Web: www.dcl.co.nz
INTRODUCTION
Pavement structural tes�ng is required to ascertain
pavement strength and therefore performance. When a
heavy vehicle drives over a pavement it causes the
pavement to momentarily bend. This applies stresses and
strains within the pavement structure leading to surface
fa�gue and / or subgrade deforma�on.
A Falling Weight Deflectometer (FWD) simulates this by
non-destruc�vely dropping a known load onto pavement
surface. When the load plate strikes the pavement it
produces a half-sine loading pulse. This pulse (commonly
known as a deflec�on) is recorded by the sensors
posi�oned linearly from the plate, along the road.
Our survey is carried out in conformance with the
following standards:
• Austroads Test Methods
• NZTA Supplement Manuals.
WHAT YOU GET IF YOU PURCHASE
THIS SERVICE
Accurate, reliable data provided in the format you
require.
Raw files can be supplied allowing you to process and
analyse the data set. Alterna�vely data can be processed
and results uploaded into your Pavement Management
System or provided in PDF or excel format.
Deliverables include:
• Raw FWD file
• Deflec�on and curvature results to target
geotechnical tes�ng
• Structural Number (SNP) for RAMM
• Layer moduli results based on pavement layer
informa�on.
• Sub-grade CBR
• Remaining life and pavement designs based on traffic
count data.
BENEFITS OF USING OUR SERVICE
• Independent Surveyor
• Skilled operators with sound understanding of good
quality data and the importance of surface defect
comments
• Quick Mobilisa�on
• Stringent data checks conducted on-site and in the
office.
• User defined data formats
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SSTRUCTUALTRUCTUAL TTESTINGESTING
D AT A C O L L E C TI O N L I M I TE D
Post: PO Box 348 | Motueka 7143 | NEW ZEALAND Office: 8C Bentinck Street | New Lynn | Waitakere | Auckland 0600 |NEW ZEALAND
Ph: 0800 222 404 Fax: +64 9 827 7704 E-mail: [email protected] Web: www.dcl.co.nz
JILS FWD
The JILS FWD loads the pavement using forces developed by the
arrest of a falling weight. The weight is raised to a pre-
determined height from which it is dropped onto a set of buffer
springs. The arrest of the falling weight produces a half-sine
loading pulse. The system includes an engine to provide all of
the hydraulic and electrical power required for opera�on.
Applied Load & Load Cell
Our JILS Falling Weight Deflectometer (FWD) which has a
standard 300mm diameter load plate able to apply a load up to
120kN. The magnitude and dura�on of the applied load are
func�ons of three things, the weight dropped, the proper�es of
the buffer springs, and the height from which the weight falls.
The JILS FWD permits varia�on of each of these three system
elements.
Deflec�on Sensors
A set of up to eleven velocity transducers are used to measure
the displacement of the pavement in response to the applied
loading. These transducers are mounted in the “sensor boom”
and are posi�oned at set distances from the load cell. The
number of transducers and their spacing can be altered
according to contract requirement.
DGPS RECEIVER
This system u�lises a high-end Trimble GPS receiver connected to the Omnistar network to collect sub-
meter and real-�me DGPS co-ordinates na�onwide.
HIGH ACCURACY DISTANCE RECORDING
Accurate distance measurement is crucial for loca�on of structural data. Our system uses a robust Nu-
metrics Nitestar distance measuring unit that gives the operator the ability to accurately and reliably
posi�on the equipment.
DATA ACQUISITION SOFTWARE
The JILS FWD is a computer dependent system. The computer is used to control all of the opera�ons of the
system and to record the test results. The computer includes a display to provide the operator with
opera�ng instruc�ons, control op�ons, and numerical and graphic test results. The computer board,
through a high-speed data acquisi�on and control system interface controls, all system func�ons. Signals to
and from this board are passed through a special JILS interface board.
TTHEHE EEQUIPMENTQUIPMENT UUSEDSED ANDAND BBENEFITSENEFITS FORFOR CCUSTOMERSUSTOMERS
D AT A C O L L E C TI O N L I M I TE D
Post: PO Box 348 | Motueka 7143 | NEW ZEALAND Office: 8C Bentinck Street | New Lynn | Waitakere | Auckland 0600 |NEW ZEALAND
Ph: 0800 222 404 Fax: +64 9 827 7704 E-mail: [email protected] Web: www.dcl.co.nz
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