12.7mm Unbonded Prestressed Steel Strand

12.7mm Unbonded PC Strand / Unbonded Steel Strand for Prestressed Concrete

This product is suitable for cast-in-place concrete projects. Such as cast-in-place slabs, geotechnical projects, foudation piles, slope support,etc.

It has the characteristics of no need to reserve holes, easy construction, saving bellows materials, and random bending.

Its application in recoverable anchor cables saves a lot of cost for engineering projects.

The specifications is conforming with JG 161-2004.

Steel is in accordance with GB/T5224-2014, or EN10138/BS5896,or ASTM A416, or other standards clients require.

Sheathing: GB 11116,GB/T9341. Grease: JG3007-1993.

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ADVANTAGES

- Excellent Bare Wire Testing Performance: In various mechanical performance tests, the bare wire consistently meets key indicators such as tensile strength and elongation, effectively ensuring the structural load-bearing capacity during construction and use.

- Reliable Use of Professional Anti-corrosion Grease and HDPE Sheath : The specialized anti-corrosion grease used has excellent stability and durability, providing long-term insulation against corrosive media such as moisture and oxygen, protecting the steel strands from corrosion. The outer layer of HDPE (high-density polyethylene) offers high strength, abrasion resistance, and aging resistance, further enhancing the overall protective performance of the steel strands.

- HDPE Sheathing Available in Various Colors : The HDPE sheathing can be customized in different colors, facilitating quick identification of steel strands of different specifications and applications in complex engineering environments, meeting the personalized requirements of certain projects.

- The Length in Meters Can be Marked on the Sheath : Length information can be intuitively read during cutting and laying, eliminating the need for additional measurements. This significantly improves construction efficiency and reduces material waste caused by improper length control.

What makes this product different to other factory's unbonded prestressed steel strand?

12.7mm Unbonded Prestressed Steel Strand

Ours Appearance is very good.

Thickness uniform, surface smooth.

Friction coefficient between steel strands and inner wall of sheath in unbonded prestressing tendon is very excellent.

Friction coefficient considering local deviation per meter length of unbonded prestressing tendon is very small.

USE

The 12.7mm prestressed unbonded steel strand, with its ability to apply prestress without the need for additional bonding procedures, is widely used in various engineering fields:

- Construction engineering: Commonly used in concrete structures such as long-span floor slabs, frame beams, and transfer floors. By applying prestress, it counteracts part of the tensile force generated by loads, reduces component deflection, optimizes structural stress, and saves material usage.

- Bridge engineering: Suitable for precast beams, continuous beams, and bridge deck systems of small and medium-sized bridges. It enhances the crack resistance and load-bearing capacity of bridge structures, improving the stability of bridges during long-term use.

- Municipal and special engineering: Such as large parking lots, stadium stands, and nuclear power plant containment structures. It can meet the requirements for precision in prestress application and corrosion resistance of these structures, ensuring the safety and durability of the project.

- Water conservancy engineering: Plays a role in prestressed concrete structures of water conservancy facilities like sluices and aqueducts. It adapts to the humid and corrosive conditions of the water conservancy environment, ensuring the long-term reliable operation of the structure.

SPECIFICATIONS

YXXK-UPS Series Unbonded PC Strand (Ref. JG161-2004, Single layer HDPE Sheathing):

CODE	Steel			Grease	Sheathing thickness	μ	κ
				W3 (g/m)	(mm)
	Diameter (mm)	Section Area (mm2)	Tensile Strength (Mpa)	(no less than)	(no less than)
YXXK-UPS13	12. 7	98. 71	1860	43	1	0.04 ~ 0.1	0.003 ~ 0.004

μ- Friction coefficient between steel strands and inner wall of sheath in unbonded prestressing tendon.

κ- Friction coefficient considering local deviation per meter length of unbonded prestressing tendon.

Steel Part:

- High tensile strength steel strand is conforming with international standard, the T/S grade is more than 1920 Mpa,

- Straightness is excellent, bow height per meter is less than 2mm,

- the steel is newly produced, rust steel and old steel is forbidden.

- dust, granular objects, corrosive substances, oil, on the surface of steel is not allowed.

12.7mm Unbonded Prestressed Steel Strand

Grease Part:

- The anti-corrosion grease used in the production of unbonded prestressed steel strands has good chemical stability and have no corrosive effect on surrounding materials; it can block water, moisture and corrosion, good lubricating performance, reduce friction resistance, does not flow at high temperature and not brittle at low temperature within the specified temperature range.

Test Item		Test Ways	Requirement
Work cone penetration	25℃， 0.1mm	GB/T269	265-295
Corrosion	45# steel, 100℃, 24hours	SH/T0331	-
Drop point	℃, no less than	GB/T4929	160
Moisture	%, no more than	GB/T512	0.1
Stencil oil	%, (100℃, 24hours), no more than	SH/T0324	8
Evaporation losses	%, (99℃, 24hours), no more than	GB/T7325	2
Low temperature performance	-40℃, 30 minuts	SH0387	-
Humid heat test	grade, (45#steel30D), no more than	GB/T2361	2
Sailt spray analysis	grade, (45#steel30D), no more than	SH/T0081	2
Oxidation Stability	99℃, 100hours, 785kpa, pressure no more than	SH/T0325	147
Oxidation Stability	acide value after oxidation mgKOH/g, no more than	GB/T264	1
PH Value	-	PH test paper	7. 0-8. 0
Compatibility casing oil absorption	%, (65℃, 40D), no more than	HG2-146	10
Tensile strength change rate to casing compatibility	%, (65℃, 40D), no more than	GB1040	30

12.7mm Unbonded Prestressed Steel Strand

HDPE Part:

Properties	Test Ways	Requirements
Large and small grains, g/kg	SH/T 1541.1-2019	≤5
Black grain, piece/kg	SH/T 1541.1-2019	0
Color grains, piece/kg	SH/T 1541.1-2019	≤5
Snake skin grains, piece/kg	SH/T 1541.1-2019	≤10
Density (23℃), g/cm³	GB/T1033.2 or ASTM D1505	0.9510+-0.0020
Enviromental Stress Crack Resistance	Condition A, F50,100% lgepal CO-630,ASTM D1693	≥30 hours
Enviromental Stress Crack Resistance	Condition B, F50:35; Bottles ESCR:250, 60℃, F50	≥30 hours
Melt Flow	Condition 190/2.16,ASTM D1238	≤0.35 g/10min
Melt Flow	GB/T 3682. 1	1.0+-0.2
Tensile Strength	2 in per min, ASTM D638 Type IV	≥28MPA
Elongation at break	2 in per min, ASTM D638 Type IV	≥600%
Flexural Modulus	ASTM D790	1. 378Gpa
Brittleness Temperature	ASTM D746	Max -118℃