ductal-blast test australia
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8/8/2019 Ductal-Blast Test Australia
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Brian CavillBrian Cavill FIE Aust CPEngFIE Aust CPEngChief Technical OfficerChief Technical Officer
VSL Australia Pty LtdVSL Australia Pty Ltd
Ductal
An Ultra-high Performance Materialfor Resistance to Blasts
ENGINEERING AND RESEARCH FORUM
25th February 2005, Canberra
CompositionComposition
PropertiesProperties
ApplicationsApplications
Blast Trials atBlast Trials at WoomeraWoomera
Water/binder = 0.18
Silica fume
Fine quartz
Sand
High strength steel fibers156 AdditiveWater
Total = 2,450 kg/cu m
TypicalComposition
ofDuctal FM
150-200MPa
Cement700
kgFibres
Ductal FM
Material HT Steel
Tensile Strength 2,000 MPa
Youngs Modulus 200,000 MPa
Diameter 0.2 mm
Length 13 mm
Quantity 2% / cu m
COMPRESSION TESTS Cylinders 100mm dia x 200mm COMPRESSIVE STRENGTH after Heat Treatment
0
20
40
60
80
100
120
140
160
180
200
0
923
1845
2768
3690
4613
5535
6458
7380
8303
9225
1
0148
1
1070
Micro Strain
StressMPa
Test results : 174 - 186 MPa
Characteristic for design,
fc= 160 Mpa
E = 47 GPa
Typical concrete
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FLEXURE TESTS prisms 100mm x 100mm x 500mm
TYPICAL FLEXURAL TEST (to AS1012.11)
0
5
10
15
20
25
30
35
40
0 2 4 6 8
Deflection mm
Bending
Stress
M
Pa
FLEXURAL STRENGTH after Heat Treatment
Test results
Mod. of Rupture : 25-39 MPa
Characteristic for design
M.O.R. fcf min = 15 MPa
Typical concrete
TYPICAL FLEXURAL TEST (to AS1012.11)
0
5
10
15
20
25
30
35
40
0 2 4 6 8
Deflection mm
BendingS
tress
M
Pa
Plain concrete
FRACTURE ENERGY
Fiber reinforcedconcrete
Total Fracture Energy20,000 - 30,000 J/m2
Flexural toughness of Ductalis greater than 200 timesthat of conventional, non-fiber reinforced concrete
Durability Indicator Value Ductal compared to HighPerformance Concrete
Total porosity 2% - 6% 4 to 5 times lower
Microporosity (>10m) < 1% 10 to 30 times lower
Permeability (air) 2.5 x 10^-18 sqm 50 times lower
Water absorption < 0.2 kg/sqm 50 times lower
Chloride ions diffusion 0.02 x 10^-12 sqm/s 50 times lower
Electrical resistance(excl. fibre)Electrical resistance
(incl. fibre)
1.13 x 10^3 k.cm
137 k.cm
12 to 17 times greater
1.5 to 2 times greater
Abrasion resistancecoefficient
1.3 2 to 3 times greater
DURABILITY PROPERTIESCan provide a design life ofseveral hundred years in an
aggressive environment
APPLICATIONSAPPLICATIONS
Rhodia head office, Paris20mm Ductal FO Facade Panels, 2000
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Seoul footbridge - Lifting
120m span footbridgeSeoul
July 2004
RTA Bridge siteShepherds Creek,Lake Macquarie NSW1 x 15.4m span, 4 lanes
Ductal beams
Ductal formwork slabs
Load test of 25mm thick Ductal permanent formwork slabLoad = 960 kg = 6.6 kPa
25mm1300mmclearspan
Load test of 25mm thick Ductal permanent formwork slab
Load = 2,560 kg = 17.7 kPa
1300mm clear span
25mm
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Blast Tests at Woomera, May 2004Blast Tests at Woomera, May 2004
2 blasts of 5 tonnes of of Hexolite (60/40 RDX/TNT),equivalent to 6 tonnes of TNT
Testing of 2 types of Ductal panels at 3 distances
Panel size 2m x 1m x 100,75 & 50mm
Span 2m one way
Panels Type 1 - pretensioned - at 30m, 40m and 50m
Panels Type 2 - plain - at 40m and 50m Design pressure - 2000kPa at 30m, 800kPa at 40m, 420kPa at50m, (reflective pressure)
Test Measures actual blast pressure and panel deflections
2 blasts of 5 tonnes of of Hexolite (60/40 RDX/TNT),equivalent to 6 tonnes of TNT
Testing of 2 types of Ductal panels at 3 distances
Panel size 2m x 1m x 100,75 & 50mm
Span 2m one way
Panels Type 1 - pretensioned - at 30m, 40m and 50m
Panels Type 2 - plain - at 40m and 50m Design pressure - 2000kPa at 30m, 800kPa at 40m, 420kPa at50m, (reflective pressure)
Test Measures actual blast pressure and panel deflections
BLAST 13 Ductal panels
100mm stressed at 30m
75mm stressed at 40m
100mm stressed at 40m
Front of a support framebefore inserting the testpanel
Back of a support frame,with access hatch
Typical Ductal panel 2m x 1m
Inserting a panel into theslots in the support frame
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BLAST 1 - panels at 40m ready for blast test BLAST 1 - 100mm stressed at 30m,ready for blast test
5 tonne of hexoliteexplosives, equivalentto 6 tonne of TNT
Observation point 3km from blast
Blast Tests at
WoomeraMay 2004
Blast Tests at
WoomeraMay 2004
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Crater caused byBLAST 1
BLAST 1
100mm stressed at 30m
100mm RC at 30m
75mm stressed at 40m
100mm stressed at 40m
BLAST 1 - 100mm stressed at 30mMovement 50mm in from datum then to 37 out from
datum and then to final position on datumBasically undamaged
BLAST 1 - 100mm stressed at 40mFinal position on datumBasically undamaged
BLAST 1 - 100mmstressed at 40m
BLAST 1 - 75mm stressed at 40m
Movement 72mm in from datum then to 55 out from datum andthen to final position 18 in from datum
Fractured but intact, hairline crack in back face, no spalling
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BLAST 1 - 75mmstressed at 40m
BLAST 1 - 75mmstressed at 40m
75mm stressed at 30m
100mm plain at 40m
50mm stressed at 50m
50mm plain at 50m
BLAST 24 Ductal panels
BLAST 2 - 75mm stressed at 30mFractured, 150mm final deformation, no spalling
BLAST 2 - 75mmstressed at 30m
Back face -fractured, no spalling 50mm plain at 50m
BLAST 2
50mm stressed at 50m
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BLAST 2 - 50mm stressed at 50mFinal position on datum
Intact with shallow crack,no spalling or fragmentation
Reinf.concrete magazine at 20m - 250mm walls
The Ductal panels performed excellently, givingprotection from the blast pressure and having nofragmentation.
The stressed panels were able to sustainconsiderable deflection (up to span/28 ) withoutfracture.
The results of the tests on a range of paneltypes and distances from the blast provideconfidence in the design procedure.
Main ObservationsMain Observations Advantages of Ductal for Blast ResistanceAdvantages of Ductal for Blast Resistance
Ductal panels can be very much thinner thanconventional concrete or steel/concrete composites
Ductal panels eliminate the risk of injury or damagecaused by concrete schrapnel as they do not breakinto fragments when subject to blast loading
The ultra high durability of Ductal makes itparticularly suitable for applications exposed toaggressive environment in addition to having a risk ofblast loading
The lighter weight of the Ductal sections reducetransport & erection costs, and can reduce the cost ofthe supporting structure
Connections can be made using bolts or poured joints
Ductal panels can be very much thinner thanconventional concrete or steel/concrete composites
Ductal panels eliminate the risk of injury or damagecaused by concrete schrapnel as they do not breakinto fragments when subject to blast loading
The ultra high durability of Ductal makes itparticularly suitable for applications exposed toaggressive environment in addition to having a risk ofblast loading
The lighter weight of the Ductal sections reducetransport & erection costs, and can reduce the cost ofthe supporting structure
Connections can be made using bolts or poured joints
Brian CavillBrian Cavill
VSLVSL Australia Pty LtdAustralia Pty Ltd
Tel : 02 9484 5944 email : bcavill@vslsyd.aust.comTel : 02 9484 5944 email : bcavill@vslsyd.aust.com
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