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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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-UPS9	9. 53	54. 84	1860	32	0. 8	0.04~ 0.1	0.003 ~ 0.004
YXXK-UPS13	12. 7	98. 71	1860	43	1	0.04 ~ 0.1	0.003 ~ 0.004
YXXK-UPS13	12. 9	100	1860	45	1	0.04 ~ 0.1	0.003 ~ 0.004
YXXK-UPS15	15. 24	140	1860	50	1	0.04 ~ 0.1	0.003 ~ 0.004
YXXK-UPS15	15. 7	150	1860	53	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

Why should I buy this unbonded prestressed steel strand?

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.

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

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℃

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

Unbonded PC 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.

Other factory's product

Granulated impurity in the coating, surface is not smooth, leak grease, μ and κ is not good.