Prestressed Steel Wire with Indentations

(Standard: IRAM/IAS U 500-245:2017)

Wire obtained by drawing and indentation forming, uncoated, with a low-relaxation thermal mechanical treatment for use as reinforcement in prestressed concrete. The surface of the wire has indentations that reduce longitudinal movement of the wire in such construction. The indentations along the longitudinal axis of the wire are found in two or more lines evenly spaced around the wire; one indentation line may be inclined in the opposite direction to the others (see Figure).

It is mainly used to enhance the bond between the wire and concrete. It is widely used in prestressed concrete structures such as buildings and bridges.

NOTE: The figure shows an example of indented wire, which may differ in design and shape.

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ADVANTAGES

Wire obtained by drawing and indentation forming, uncoated, with a low-relaxation thermal mechanical treatment for use as reinforcement in prestressed concrete.

The surface of the wire has indentations that reduce longitudinal movement of the wire in such construction.

The indentations along the longitudinal axis of the wire are found in two or more lines evenly spaced around the wire; one indentation line may be inclined in the opposite direction to the others.

It is mainly used to enhance the bond between the wire and concrete. It is widely used in prestressed concrete structures such as buildings and bridges.

USE

Mostly used in prestressed concrete components with high bonding performance requirements, such as bridge beams, floor slabs of large buildings, pile foundations, etc., especially suitable for structural parts that rely on the bonding strength between steel wire and concrete to exert the prestressing effect.

SPECIFICATIONS

Mechanical properties

Indented wires

Designation	Nominal diameter d (mm)	Load at 1% of total elongation min. Q1 (kN)	Breaking load min. Qt (kN)	Yield strength min. Re (MPa)	Tensile strength min. R (MPa)	Percentage elongation at break under load over 200 mm, min. At (%)	Alternating folding
Designation	Nominal diameter d (mm)	Load at 1% of total elongation min. Q1 (kN)	Breaking load min. Qt (kN)	Yield strength min. Re (MPa)	Tensile strength min. R (MPa)		nº of folds	mandrill radius (mm)
APC-1800	4,2	19,4	24,3	1 396	1 748	2.5	3	15
APC-1650	5,2	28,2	35,3	1 330	1 665		3	15
APC-1680 ^a	6,0	43,0	47,7	1 521	1 687		2	15
^a Wire for concrete sleepers. NOTA. Loading at 1% total elongation is considered equivalent to loading at 0.2% permanent deformation.

The nominal values of the diameter, cross-sectional area and mass of the wires must comply with those indicated in the table.

Indented wires

Designation	Nominal diameter d	Nominal cross-sectional area S	Mass per unit length^a
Designation	mm	mm²	kg/m	Discrepancies
APC-1800	4,2	13,9	0,109	± 8 %
APC-1650	5,2	21,2	0,167
APC-1680 ^b	6,0	28,26	0,221
^a The values of the nominal mass per unit of length are calculated considering that the density of steel is 7.85 kg/dm³ and with a value of π = 3.1416. ^b Wire for concrete sleepers.

Measurement of wire indentation for concrete sleepers

Designation

Nominal diameter

(mm)

Indentation depth

(mm)

Width

(mm)

Step

(mm)

APC-1680

0,14 ≤ h ≤ 0,21

Example of indentation dimensions

Nominal diameter d	Depth h	Width min. a	Step min. p	Periphery without entrants Σe
mm	mm	mm	mm	mm
d ≤ 5,0	0,12 ± 0,05	3,5	5,5	0,3 π · d
d > 5,0	0,15 ± 0,05	5,0	8,0	0,3 π · d