Reinforcement Steel Bars Specifications

according to European Norm UNE 36-068-94

Chemical Composition: Types B 400 S & B 500 S

Analysis C% max.

Ceq 1)

% max.P

% max.S

% max.N 2)

% max.Washing 0,22 0,50 0,050 0,050 0,012Product 0,24 0,52 0,055 0,055 0,013

% Mn % Cr + % Mo + % V % Ni + % Cu 1) % Ceq = % C + ------------ + -------------------------------- + --------------------

6 5 15

Mechanical Characteristics: Traction Test

Steel Types Re 1) 2) 3) Rm 1) 2) 3) As 2) 4) Rm / Re 5)

min.MPa MPa %B 400 S 400 440 14 1,05B 500 S 500 550 12 1,05

1) 1 MPa = 1 N/mm2 = 0,102 kgf / mm2

2) Specified Characteristic Value.

3) Nominal section will be used to calculate de unitary charges (voltage).

4) The total lengthening under maximum charge shall be above 5 %.

5) Minimum acceptable relation between traction resistance values and elastic limit obtained in each test.

Fold – Unfold Test: Mandrel diameter, D’

Steel Types Mandrel Diameter D’Y1 = 90º Y2 = 20 º 1) 2) 3)

d ≤ 12 12 < d ≤ 16 16 < d ≤ 25 25 < d ≤ 40B 400 S 5 d 6 d 8 d 10 dB 500 S 6 d 8 d 10 d 12 d

1) d = nominal diameter

2) Y1 = angle of fold

3) Y2 = angle of unfold

Geometry of Corrugated Bars

Nominal Diameter

mm

Minimum Height of Corrugated Bars 1)

mm

Separation of Corrugated Bars 2)

fR Rate of the Corrugated Bars

min.B 400 S Steel B 500 S Steel

C1 C2 C6 0,39 5,8 4,2 5,0 0,0398 0,52 6,6 4,8 5,7 0,04510 0,65 7,5 5,5 6,5 0,05212 0,78 8,3 6,1 7,2 0,05614 0,91 9,7 7,1 8,4 0,05616 1,04 11,0 8,2 9,6 0,05620 1,03 13,8 10,2 12,0 0,05625 1,63 17,3 12,7 15,0 0,05632 2,08 22,1 16,3 19,2 0,05640 2,60 27,6 20,4 24,0 0,056

1) Measure in the centre of the corrugated bars.

2) Tolerance: ± 15 % for diameters above 8 mm and ± 20 % for diameters between 6 mm and 8 mm.

Adherence Characteristics (minimum values)

Nominal diameter (mm) Mean Tension τm (MPa) Broken Tension τu (MPa)Less than 8 6,90 11,30

From 8 to 32 7,80 – 0,12 d 12,70 – 0,19 dAbove 32 4,10 6,80

Coefficient of Acceptance k according to the size of the sample

n k n k5 3,40 30 2,086 3,09 40 2,017 2,89 50 1,978 2,75 60 1,939 2,65 70 1,9010 2,57 80 1,8911 2,50 90 1,8712 2,45 100 1,8613 2,40 150 1,8214 2,36 200 1,7915 2,33 250 1,7816 2,30 300 1,7717 2,27 400 1,7518 2,25 500 1,7419 2,23 1,000 1,7120 2,21 ∞ 1,64