Download - Standards 2583 & 2835
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Standards
ASTM E2583-07“Measuring Deflections with a
Light Weight Deflectometer (LWD)”
NOW….
ASTM E2835-11 “Measuring Deflections using a Portable Impulse
Plate Load Test Device
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SCOPEASTM D 2583-07
ASTM D 2835-11
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SUMMARY OF TEST METHOD
ASTM D 2583-07
ASTM D 2835-11
No possibility to investigate the material stress dependancy
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SIGNIFICANCE OF USEASTM D 2583-07
ASTM D 2835-11
Different way to measure deflection
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ASTM D 2583-07
Changing drop height and drop weight is possible to simulate the real stress applied by the design wheel load.
The standard 2583-07 recommend to be careful to the volume of soil involved but not to the stress level applied
ASTM D 2835-11
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APPARATUSASTM D 2583-07
ASTM D 2835-11
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-2.0
0.0
2.0
4.0
6.0
8.0
10.0
12.0
14.0
0.0 5.0 10.0 15.0 20.0 25.0 30.0 35.0
ms
kN
Load Dynatest
Load Zorn
Dynatest – Load cell output. Zorn – from a series of 15 kg laboratory test on load cells.
APPARATUS
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ASTM D 2583-07
ASTM D 2835-11
APPARATUS
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ASTM D 2583-07
ASTM D 2835-11
…………
APPARATUS
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ASTM D 2583-07 – Signal condition and Record System
ASTM D 2835-11 – Reagents and Materials
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ASTM D 2583-07 - Calibration
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ASTM D 2835-11 - Sampling
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ASTM D 2835-11 – Sampling + Verification
VERY LONG PROCEDURE
SAMPLING + VERIFICATION
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ASTM D 2835-11 – Maintenance and handling
d
rfE
21
f=2, r=150 mm,
σ=100 kPa ν=0.4
E(d=0.2mm)= 126 MPa Upper limit
E(d=3.0mm)= 8 MPa Lower limitBoussinesq Equation
UNIVERSITY OF PISA RESEARCH
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PRECISION AND BIASASTM D 2835-11
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UNIVERSITY OF PISA RESEARCH
NO CORRELATION!
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ASTM D 2583-07
ASTM D 2835-11
IAN 73/06 Revision 1 2009
PRECISION AND BIAS
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LWD DYNATEST LOADING
Loading Plate 100 mm 200 mm 300 mm
Drop weight mass 10 kg 15 kg 20 kg
Loading range >15 kN peak load using 20 kg
Pulse duration 15-30 ms
Drop height Variable depending to load level to be achieved
LOAD CELL
Range 0-25 kN
Accuracy 2% ± 2 kPa
Precision 0.0003 kN
DEFLECTION SENSOR
Type of sensors Velocity transducers-Geophone
Number 1 in a hole under the plate, additional 2 sensors
Range 0-2200 μm
Sampling period 60-120 ms, set by user
Accuracy 2% ± 2 μm
Precision 0.1 μm
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PRECISION AND BIASASTM D 2835-11
Additional error due to the absence of the load cell…
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Performance Foundation Group UK
• LWD Best Practice Guide
– The LWD is considered in general to be relatively rapid and cost effective tool
• Guide aims to provide a useful reference to LWD users, specifically to explain three key aspects:
– Principle of operation
– Use for construction testing
– Protocols for measurements and reporting
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LWD Best Practice Guide
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LWD Best Practice Guide