deflection and traction test

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CSTBDEPARTMENT SECURITY, STRUCTURE AND FIREDivision Studies and mechanical tests

TRANSLATIONTEST REPORT NoEEM 02 046

on the COFOR stay in place System

Requested by: AMILFI SARL

1, place du 18 juin 1940

74940 ANNECY LE VIEUX

FRANCE

PARIS MARNE-LA-VALLEE GRENOBLE - NANTES - SOPHIA ANTIPOLIS

CENTRE SCIENTIFIQUE ET TECHNIQUE DU BATIMENT


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CSTB test report noEEM 02 046 - translation

TABLE OF CONTENT

1.

OBJECT . 3

2. REFERENCE TEXT . 3

3. SAMPLES ..... 3

4. IDENTIFICATION OF LABORATORY AND TEST PROGRAM 4

5. NATURE OF THE TESTED PRODUCTS ..... 4

6.

TEST METHOD 6

6.1 Determination of bonding of C profile under traction .... 6

6.2 Deflection test on a COFFOR wall .. 8

7.

MEASUREMENT DEVICE. . 9

8. ACQUISITION AND PROCESSING DATA DEVICE ...10

9. TEST RESULTS ... 11


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1. OBJECT

At the request of the company AMILFI, bonding test on C channels and deflection test onthe stay-in-place COFOR wall were performed in order to determine the bonding

capacity of the C channels and the behaviour of the wall under instantaneous linear loads.

2. REFERENCE TEXTS

[1] The tests were made based on the order letter ref SdS/EM of May 21, 2002

defining the program and the tests methodology

[2] Norm NF P18-451: Concrete, depression test (December 1981).

[3] Norm NF P 18-406: Concrete, compression test (December 1981).

[4] Norm NF P 18-406: Concrete, splitting test (December 1981).

[5] Norm NF EN 10002-2. Metallic material. Traction test. Part 2. Verification of

the measurement System for the load of the traction test machine.

[6] Norm NF E 11 063. Sensors of linear displacements Specifications Test

methods.

3. SAMPLES

Implementation : CSTB

Manufacturer : AMILFI

Origin : China

Delivery Date : 18/10/2002

Observation : None

Done at Marne La Valle, December 12,

2002

The Engineer The Division Head

in charge of the tests

Emmanuel ORTUNG Philippe RIVILLON


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4. IDENTIFICATION OF THE LABORATORY AND TESTS PROGRAM

The tests took place on November 28, 2002 in the Laboratory of Structure ofDEPARTMENT SECURITY, STRUCTURE AND FIRE at the Research Center of

CSTB in MARNE LA VALLEE.

Exhibit 4.1: Program of tests performed

Test Nature of Dimensional characteristics

Number

of

Span

between

no tests of the tested products (mm) supports 2 supports

length width thickness (mm)

1 to4 Determination of

bonding of C

channels 700 1200 140 - -

under traction

5 Deflection of a

stay-in-place 2000 1200 140 2 1900

COFOR wall

5. NATURE OF THE TESTED PRODUCT

The COFOR System is a formwork made of two panels with vertical C channel made of

folded steel with 2 grids made of rib lath, connected with zigzag loop in steel. The panels

are manufactured and assembled in the factory.

5.1 Characteristics of the formwork

The C channels have the following characteristics (see Exhibit 5.1):

Width: 47 mm

Leg height: 17 mm

Length of return: 6 mmWidth of measured steel: 0.63 mm

Figure 5.1 Geometric characteristics of the C channels (dimensions in mm)

6

17

47


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5.2 Characteristics of the concrete used

The two walls were poured on September 19, 2002 from the same concrete whose

composition is given in exhibit 5.2.

The slump according to [2] was 10 cm.

The formwork were placed vertically and poured in 70 cm layers. Between each layer,

concrete was vibrated externally with a wooden hammer.

After concreting, the exterior was swept out to clean the excessive chalk.

The mechanical characteristics (resistance in compression and in traction by splitting

according to [3]) and the characteristics of concrete are given in exhibit 5.3.

Exhibit 5.2: Composition of concrete for the two walls

Components Quantity

dry kg/m3

Cement Calcia GAURAIN CEM II/B-M(LLS) 32.5R CP2 300

Aggregate 0/8 Morillon-Corvol BOUAFFLE silico-calcaire half crushed

clean 998

Aggregate 4/20 Lafarge LA BROSSE silico-calcaire 817

Water 240


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Exhibit 5.3: Physical and mechanical characteristics of the concrete for the 2 walls

Type Age Type Conditions Mass Volumic Resistance

of test of tubes of (g) Mass Mpa

conservation (kg/m3)

14421 2253 31.9

Outside 14245 2226 32.1

Compression Warehouse 14416 2253 30.1

28 days Cylinders Water 14703 2297 30.6

16 x 32

cm 20

o

C 14815 2315 32.8Traction by Outside 14354 2243 2.6

Splitting Warehouse 14280 2231 2.9

Outside 14401 2250 37.0

Compression 70 days Warehouse 14384 2248 36.6

14397 2250 33.0

6. TEST METHOD

Tests were performed according to procedures defined in [1].

Tests were performed in the Structure Laboratory equipped with frames and mobile

carriages. The frames have hydraulic jacks that allow transmission of the load to the

samples.

Each tested product is made of elements identical to those described in paragraph 5.

6.1 Determination of the bonding of the C channel under traction

6.1.1 Positioning of the tested products

The tested product is made of a panel identical to the panel described in paragraph 5,

whose interior extremities of the C channels were not embedded in concrete for more

than 10 cm.

These free extremities allow positioning of the jaw that transmits the traction effort to the

C channel (see exhibit 6.1). In order to avoid crushing the C channels, a steel dock (15 x

45 x 70 mm) was placed inside.


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6.1.2 Device for load transmission

The load is transmitted to the tested product with a hydraulic jack MATAIRCO. It is

equipped with a sensor to measure the effort.

6.1.3 Measurement device

It is made of:

- a force sensor BETA type N 1370, with +/- 50 kN stretching capacity, measures

the total load applied to the sample. The measuring device is classified class 1

according to Norm NF EN 10002-2 [5].

-

A displacement sensor CHAUVIN-ARNOUX, type L10R, with +/- 5 mmstretching capacity, measures the sliding of C channel from the wall. The

displacement sensor is classified as class 0.2 according to Norm NF E 11-063 [6].

Exhibit 6.1: Scheme of the loading device for testing bonding under traction

jawsCofor wall

C channel

Steel dockForce sensor

nucklejack

Displacement sensor

connected to the wall

Pole connected to

The C channel


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6.2 Deflection of Cofor wall

6.2.1 Positioning of the tested product

The sample is made of a panel identical to the one described in paragraph 5.

It lays over 2 rolls allowing a free longitudinal displacement and rotation of the supports.

A docking made with plaster placed between the rolls and the panels ensures uniform

spreading of the load on the supports.

The upper support is made of a reinforced metallic girder 160 cm wide. A docking with

sand between this girder and the panel is made. (see exhibit 6.2).

Exhibit 6.2: Scheme of the loading device for the deflexion test

6.2.2 Load transmission device

The load is transmitted to the sample with a hydraulic jack MATAIRCO, capacity 150

kN and stretching +/- 450 mm. It is equipped with a sensor.

950 mm 950 mm

rollPlaster decking

jack

knuckle

Force sensor

Frame

Plaster decking

W


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7. MEASUREMENT DEVICE

It is made of:

- A force sensor BETA type N 1370, with +/- 200 kN stretching capacity, measures

the total load applied to the tested product. The measuring device is classified as

class 1 according to Norm NF EN 10002-2 [5].

- A set of 4 displacement sensors CHAUVIN-ARNOUX, type L20R, with +/- 10

mm stretching capacity, measures the vertical displacement of the panel. The

displacement sensors are classified as class 0.2 according to Norm NF E 11-063

[6].

The placement scheme of the sensors is given in exhibit 7.1.

Figure 7.1: Measurement device

The loading mode is represented in the exhibit below.

Exhibit 7.2: Loading phase

21

3 4

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1/31/3

Rupture

Load


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8. ACQUISITION AND PROCESSING DATA DEVICE

The electric signals, transmitted by measurement instruments are received and processedby the following chain:

- A data acquisition central unit (HP 3421 A or HO 3497 for acquisition frequencies

lower than 1 Hz, HP 75000 VXi for frequencies below 10 kHz, HP 3852 for frequencies

below 50

kHz),

- An acquisition and data processing software designed by CSTB

- Peripheral equipment as necessary

Exhibit 8: Scheme of the acquisition and data processing System


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9. TEST RESULTS

9.1 Bonding of C profile under traction

The test results are given in:

- the summary exhibit 9.1 giving for each test, the breakage load and the breakage

mode

- The curves, as appendices, coming from the recording performed during the tests,

giving a graph of the displacement of the C channels compared to the wall,

according to the traction effort applied.

- Photos, in appendices, showing view of the measurement device and the tested

product after breakage.

Exhibit 9.1: Test results

Test Test Dimensional characteristics Embedding Breakage Breakage

no Ref. of the samples (mm) length load method

Length Width Thickness in concrete

(mm) (daN)

1 00253A 1985 R1

2 00253B 700 1200 140 100 2038 R23 00253C 2008 R2

4 00253D 2011 R2

R1 Destruction by sliding of the C channel

R2 Destruction by breakage of the C channel outside the panel


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9.2 Deflection of a Cofor wall

Test results are given in:

- The summary exhibit 9.2 giving for the test, the breakage load and the breakage

mode.

- The exhibit, in appendix, giving the following values:

F: value of the load applied to the sample by the jack, expressed in DaN

D(i) (1


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deflection and traction test

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