UNI11037-losas

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English Translation of UNI 11037

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ENGLISH TRANSLATION UNI 11037

"STEEL FIBRE TO BE USED IN THE PREPARATION OF REINFORCED CONCRETECONGLOMERATE"

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1 SCOPEThe standard specify the requirements for steel fibers used for reinforcement of concrete ormortar.

The standard do not specify the performance requirements of the fibers into the concrete or

mortar.- The standard covers straight or deformed fibers obtained from the following products

- Cold drawn steel wire from rod manufactured according to EN 10016 part 1 and 2 orpart 1 and 4 or EN 10088 part 3;

- Cold rolled strip in non alloy steel according to EN 10130 or in alloy steel according toEN 10088 part 2;

- Other types of product obtained from different manufacturing processes.

In addition to the requirement of this standard the EN 10021 shall also apply.

2 NORMATIVE REFERENCES

To be completed

3 TERMS AND DEFINITIONS3.1 Steel fiber

Steel product having a dimension prevailing the others, with smooth or worked surface,straight or deformed, used as a reinforcement of the concrete or mortar, suitable to behomogeneously mixed into fresh mix without loosing the geometrical characteristics.

3.1.1 Straight steel fiber

Steel fiber having on the longitudinal axis localized deformation less then30

L, where L is

the length of the fiber (see 3.4), but in any case not more the equivalent diameter (3.3).

3.2 Cross section of a steel fiberCross section transverse to the prevailing dimension, which shall be calculated as follows :

3.2.1 Fiber from wire from the actual diameter of the starting wire, or of the finished fiber

3.2.2 Fiber from strip from the length of the fiber, with a weight rounded to the nearestmicrogram and calculated using a volume mass of 7850 kg/m

3

3.2.3 Other fiber starting from the equivalent diameter.

3.2 Equivalent diameter (de)

3.3.1 Fibers from wire or stripDiameter of the circle with an area equal to that of the cross section area of the fiber,obtained from the following formula

(1)

Werede= equivalent diameter mmA =area of the cross section of the fiber mm

2

/2 Ade =

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3.3.2 Other FibersDiameter obtained from the average length and from the weight of a number of fibers,considering the volumic mass 7850 kg/m

3

3.4 LengthDistance between the outer ends of the fiber measured on the geometrical projection of theprevailing dimension.Example of the length of a steel fiber are shown in figure 1

Figure 1 Example of length

3.5 Shape or appearance ratio (L/de)

Ratio between the length and the nominal or equivalent diameter.

4 CLASSIFICATION AND DESIGNATION

4.1 ClassificationThe classification of the steel fiber is given in Table 1

Table 1 - Classification of steel fibers

4.2 DesignationFor the steel fibe covered by this standard the designation shall contain:

- The type of product: fiber

- The number of this standard: XXXXXX

- The dimensions: equivalent diameter and length

- The shape. Straight or deformed

- The classification of the fiber: see table 1

- The tensile strength class: see table 5

- Type and mass of coating: if required

Example 1

Steel fiber according to this standard from other manufacturing processes in non alloy highcarbon steel with equivalent diameter 0,75 mm and length 50 mm, tensile strength class

R3, deformed and zinc coated.Steel fiber XXXXXX C2 0,75 x 50 R3 deformed zinc coated

Example 2

Steel fiber according to this standard from cold rolled strip in non alloy low carbon steel withequivalent diameter 0,60 mm and length 30 mm, tensile strength class R1, straight.

Steel fiber XXXXXX B1 0,60 x 30 R1 straight

Example 3

Steel fiber according to this standard from cold drawn wire in non alloy low carbon steel withequivalent diameter 0,75 mm and length 60 mm, tensile strength class R2, deformed.

Steel fiber XXXXXX C2 0,75 x 60 R2 deformed

L L L L

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5. INFORMATION TO BE SUPPLIED BY THE PURCHASER

5.1 Mandatory information

The following information shall be supplied by the purchaser at the time of the enquiry andorder.

a) The quantity in mass;

b) The designation;

c) The type of package;

d) Bend test for fiber obtained from other processes.

5.2 Options

The following options may be agreed at the time of the enquiry and order.

a) The range of the carbon content (see table 4);

b) The range of the Manganese content (see table 4);

c) The cast analysis for special uses (see 6.3);

d) The shape for deformed fiber (see 6.2);

e) The packaging, when different from clause 9.1;

f) The additional marking (see table 8).

6. REQUIREMENTS

6.1 Dimensions

6.1.1 DiameterThe steel fiber are normally manufactured within the diameter range from 0,15 mm to 1,20mm.

The diameter tolerance are included in table 2.

Table 2 - Tolerances on equivalent diameters

6.1.2 Length

The steel fiber are normally manufactured within the length range from 6 mm to 70 mm.

The length tolerance are included in table 3.

Table 3 - Tolerances on length

6.1.3 Rapporto di forma o di aspetto

Il rapporto di forma o di aspetto delle fibre deve essere specificato da parte del fabbricante

e la tolleranza deve rientrare tra 20% per la singola fibra e 10% per la media aritmeticadelle misurazioni.

Shape or appearance ratio

The shape or appearance ratio of the fibres shall be specified by the manufacturer and the

tolerance shall be 20% for a single fiber and 10% for the average of the measurements

6.2 ShapeUnless specified at the time of enquiry and order the shape of the fiber is at the discretion of

the manufacturer.

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6.3 Chemical composition

The chemical composition of the cast shall be within the range listed in table 4.

For special uses the chemical composition of the cast shall be agreed at the time of the order.

Table 4 Cast analysis

6.4 Mechanical and technological properties

6.4.1 Tensile strengthThe starting products for manufacturing the steel fiber covered by this standard shallconform the tensile strength values listed in table 5

6.4.2 Bend testThe starting products for manufacturing the steel fiber covered by this standard shall besubmitted to reverse bend test and withstand 3 bend on a mandrel as specified in 7.5without breaks as listed in table 5.

Table 5 - Mechanical and technological properties

6.5 Surface properties

6.5.1 General

Surface imperfection shall not lead to rejection of the fiber, when the mechanical propertiesconform to the requirements of this standard and the mixing properties in the cement ormortar are maintained.

Rust, rolling scale and other type of coating shall not lead to rejection when each fiber isable to separate itself during mixing in the concrete or mortar and the when the mechanicaland bend properties conform to the requirements of this standard

6.5.2 Coating

When required the fiber may be supplied with zinc coating.

The coating shall be followed by a passivation.

In this case, the coating mass shall be according to table 6.

Table 6 - Coating Mass

7. TESTS

7.1 General

Starting products and steel fiber shall be delivered after the test listed in table 7.

Table 7 Test planning

7.2 Sampling

Sampling and preparation of the test pieces, for the mechanical test, shall be according toEN ISO 377.

Sampling and preparation of test pieces for chemical analysis shall be according to

ISO 14284.

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7.3 Cast analysis

Unless otherwise specified in the order, the choice of the method for determination of thechemical composition is left to the manufacturer of the steel.

In case of claims, the chemical analysis shall be made by a Laboratory approved by both

the manufacturer and purchaser. The method of the analysis shall be agreed bymanufacture and purchaser and shall be, as far as possible, selected from CEN CR 10261

7.4 Tensile test

The tensile test shall be made according to EN 10218-1 and EN 10002-1, on full sectiontest pieces.

The calculation of the tensile strength shall be made taking into account the actual sectionof the test piece.

7.5 Reverse bend testThe reverse bend test shall be made at 90 on a cylindrical mandrel having R= 2,5 mm.The test shall be made at ambient temperature according to EN 10218-1 for wire andUNI 5549 for strip.

For products from other processes the bent test shall be agreed at the time of order.

7.6 Dimensional control

The finished fibre shall be inspected for the verification of equivalent diameter, length andmass

7.7 Verification of the adherence and mass of the coatingThe verification of the adherence and the mass of the coating shall be according toEN 10244-2

7.8 Retest

The retest shall be made according to EN 10021.

8 INSPECTION DOCUMENT

The inspection document shall be agreed at the time of the order according with EN 10204.

9 CONFEZIONAMENTO, MARCATURA E ETICHETTATURA

9.1 PackagingUnless otherwise specified at the time of order, steel fiber according to this standard maybe supplied loose or as bit, in boxes of weight and shape at the discretion of themanufacturer, but according to the safety regulation in force. Each box shall containproducts having same type and dimension. The box shall guarantee proper protectionduring the handling and transportation.

9.2 Marking and labelling

Unless otherwise specified at the time of order, the marching shall be made with indelibleink on the package or using a label sticker to the package.

The marking shall include the information listed in table 8.

Table 8 Marking

10 PACKAGINGThe type of packaging shall be agreed between the manufacturer and purchaser

11 CLAIM

Shall be treated according to EN 10021

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UNI 11037 Tables English Page 7

Table 1 Classification of steel fibers

A

Fiber from wire

B

Fiber from strip

C

Other fiber

A1

Low C

A2

High C

A3

Inox

B1

Low C

B2

High C

B3

Inox

C1

Low C

C2

High C

C3

Inox

Table 2 Tolerance on equivalent diameter

de

mm

tolerance

%

On single fiber tutti 10

0,60 10On the average of themeasurements > 0,60 7

Table 3 Tolerance on length

L

mm

tolerance

mm

20 10 %On single fiber and on the averageof the measurements > 20 7 %

Table 4 Cast analysis

Chemical composition%, m/m

Steel type

C Mn Si Smax.

Pmax.

Cr Ni

A1-B1-C1 0,201)

0,601)

0,30 0,045 0,045 -- --

A2-B2-C2 > 0,201)

0,801)

0,30 0,06 0,05 -- --

A3-B3-C3 According to EN 10088-1

Note:

1) A narrower range can be agreed at the order with regard to the dimension of the fiber.

Table 5 - Mechanical and technological properties

Tensile strength

N/mm2

min.

Reverse Bendtest

R 1 R 2 R 3

1) 2) 1) 2) 1) 2)

Equivalentdiameter

de

mm

Rm Rp0,2 Rm Rp0,2 Rm Rp0,2 Rm Rp0,2 Rm Rp0,2 Rm Rp0,2

All classes

0,15 de< 0,50 400 320 480 400 900 720 1080 900 1700 1360 2040 1700

0,50 de< 0,80 350 280 450 350 800 640 1040 800 1550 1240 2015 1550

0,80 de 1,20 300 240 390 300 700 560 910 700 1400 1120 1820 1400

No cracks allowed

1) Starting product for manufacturing straight fibers.2) Starting product for manufacturing deformed fibers.

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Table6 - Coating mass

Equivalent diameter

demm

Coating mass

g/m

2

min.

0.15 de < 0.50 15

0.50 de < 0,80 20

0.8 de < 1,20 25

Table7 - Testing plan

Type of test Product 1) Test unit Test frequency samplingTest

methodRequirem

ents

Cast analysis steel + cast 1 per cast)

ISO 14284 7.3 6.3

Tensileproperties

Statingproduct

+ UNI EN ISO 377 7.4 6.4.1

Shape Steel fiber + 6.2

Dimension Steel fiber +

1 per day & per

production line7.6

6.1

Reverse bendStartingproduct

+ 1 each 20 ton 7.5 6.4.2

Coating mass o

Coatingadherence

Startingproduct orsteel fiber O

Manufacturinglot

2)

1 each 30 ton

Random sample

7.7 6.5

1) + = mandatory o = optional.2) Composed by fibers of the same dimension and shape.3) The certificate from the steel manufacture or the certificate from the starting product manufacture may be

used.

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Table 8 Marking

Classification +

Manufacturer +

Dimensions +

Coating o

Manufacturing date +

Cast Number o

Manufacturing lot +

Others o

Nota - + mandatory (0) optional.

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