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TENSILE TEST FOR CARBON FIBER REINFORCED PLASTIC (UNIDIRECTION)

The tensile test was carried out according to the British Standard Aerospace SeriesBS EN 2561:1996 Carbon fibre reinforced plastics. The test was arranged at TESTECH SDN

BHD located at Selangor State.

The test was required to determine the characteristic or the properties of the carbon fibre E200

which proposed to strengthen the R.C deck slab.

Tensile Strength (MPa): 3300

Ultimate elongation (%): 1.4

Modulus of elasticity (GPa): 200

The carbon fibre E200 was camped by tensile machine with the

vertically checked to ensure the unidirectional test was carried

out. The pulling speed was preset at 2mm per min.

Specimens preparation

The specimen was cut into the 10mm width and 250 1 mm.

Both ends were bonded with the end tabs with epoxy to ensure

the griping during the pulling force applied.

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The test specimen was test to failure, until the specimen was brittle.

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PULL OFF TEST ON CARBON FIBRE SYSTEM

The tests are carried out on actual structural members strengthened with the composite Carbonfibre system. Although there are variations in the equipment for carrying out pull-off tests, the

general procedure can be summarized as follows:

1. After the composite strengthening system has hardened, core drill through the compositematerial and down 3 6 mm into the concrete substrate by means of an electric drill

fitted with a carbide-tipped or diamond core bit. The core bit should be of such size as toproduce a core the same diameter as the testing dolly, and which will have the appearance

of a small island of composite material. The normal size of the dolly is 50 mm diameter.Ensure that the drilling operation does not cause any detrimental effects on the system by

using wet drill techniques to minimise heat exposure, and ensure it is perpendicular to the

surface.

2. Prepare the top of the core surface to be tested. Preparation includes cleaning of thecomposite material surface, roughening it with sandpaper, and final cleaning of any dust.

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4. Allow epoxy adhesive to cure sufficiently (usually 24 hours or as required).5. Zero the machine and increase the load until a specified level is reached or the specimen

fails.

6. At failure, the maximum pull-force is registered and the pull-off tensile strength iscalculated by dividing the force by the cross-sectional area of the core. The mode of

failure shall be recorded i.e., within the concrete substrate, within the composite material,

between substrate and composite material, between composite material and dolly, or any

combination of the above.

7. Pull-off tests shall be carried out on each selected area. The average of the values shall betaken as a pull-off strength result.

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DATE TEST NO.

MATERIAL TYPEAGE OF

MATERIALSGauge

Reading

(N/Sq.mm)

Test size

sq. (mm)

Test Area,

A (sq.mm)

Min.

Requirement

(Tensile

strength, Mpa)

Tensile

bond

strength

(Mpa)

Failure

ModeRemarks

A B A B

22-Jun-13(Carbon fiber)

Specimen 1concrete

Mapei -Adesilex PG2

- 4 days 5.66 60 3600 1.5 3.09 6 ACCEPTED

22-Jun-13(Carbon fiber)

Specimen 2concrete

Mapei -Adesilex PG2

- 4 days 3.46 60 3600 1.5 1.89 1 ACCEPTED

22-Jun-13(Carbon fiber)

Specimen 3concrete

Mapei -

Adesilex PG2- 4 days 6.16 60 3600 1.5 3.36 1 ACCEPTED

Fr equent of test = 2 nos per proj ect or 100m per 2 nos samples

Failure Mode (A= Existing Substrate , B= Repair material , C= dolly )

Failure Mode 1 100% Bond failure at dolly (100% B/C)

Failure Mode 2 100% Cohesive failure of repair material (100% B)

Failure Mode 3 100% Bond failure of repair material (100% A/B)

Failure Mode 4 Partial Bond failure and cohesive failure of repair material (.....% A/B, .....%B)

Failure Mode 5 Partial Bond failure and cohesive failure of existing substrate (.....% A/B, .....%A)

Failure Mode 6 100% Cohesive failure at dolly (100% A)

A = Existing Substrate ( R.C Slab)

B = Repair Material

C = dolly