ductal-blast test australia

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



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 RC at 30m



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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100mm plain at 40m


50mm plain at 50m

BLAST 24 Ductal panels

BLAST 2 - 75mm stressed at 30mFractured, 150mm final deformation, no spalling


Back face -fractured, no spalling 50mm plain at 50m

BLAST 2



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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 : [email protected] : 02 9484 5944 email : [email protected]

ductal-blast test australia

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