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: survey@dcl.co.nz 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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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: survey@dcl.co.nz 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.

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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: survey@dcl.co.nz Web: www.dcl.co.nz