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PACKING SIZE AND TESTING OF PRESTRESSED STEEL STRANDS

1MechanicalProperty Index

 

Steel strands

structure

Nominal OD mm

Strength

gradeMPa

 maximal force of the whole piece of steel strands/KN

Maximanl value of the maximal force of the whole piece of steel strands/KN

0.2%

yield strenghkN

The genera enlogation rate of maximal force 500mm

1000h

relaxation()

70the largest nominal loading

80the largest nominal loading

min

max

min

min

max

max

1×7

Standard type

15.2

1470

206

234

181

3.5

2.5

4.5

1570

220

248

194

1670

234

262

206

9.5

1570

94.3

105

83

11.1

1670

128

142

113

12.7

1720

170

190

150

15.2

241

269

212

17.8

327

365

288

18.9

1820

400

444

352

15.7

1770

266

296

234

21.6

504

561

444

9.5

1860

102

113

89.8

11.1

138

153

121

12.7

184

203

162

15.2

260

288

229

15.7

279

309

246

17.8

355

391

311

18.9

409

453

360

21.6

530

587

466

9.5

1960

107

118

94.2

11.1

145

160

128

12.7

193

213

170

15.2

274

302

241

l×7I

12.7

1860

184

288

162

15.2

1860

260

231

229

l×7C

12.7

1860

208

333

183

15.2

1820

300

428

264

18

1720

384

428

338

 

2 Packing Size

Size of per coil steel strandsthe insidediameter of steel strands coil ≥750mm (usually 800mm)when steel strands size OD≤18.9mmthe insidediameter of steel strands coil ≥1100mm when steelstrands size OD18.9mm width750±50mmsingle coil weightcould be controlledusually 2.5~3.0tbinding not lessthan 6 round

Container loading calculating methodcalculatingaccording to2.5ton per coil11 coils

in one 20containeralmost 27.5ton


3.Testing


3.1 including rawmaterial entering millsemi producttestingfinal producttesting


3.2  Testing Items


3.2.1 MachanicalPropertymaximal forcetentile strength)、yield strengh500mmstandard distance elongation≥3.5%stess relaxationrate during 1000 hours ≤2.5%elasticity modulusspecial experimentaxial fatigueexperimentskewness tensilestress corrosionneed both parties consult and indicate clearly in the contract


3.2.2 appearance andsizevisual qualityoutside diameterstraigtness

there is no any oillubricating greaseon the the surface of the steel strandstempering colorpermitted.

straightnessto put a piece ofsteel strands with one meter long chord on the planethe highest heightof the inside of the chord and arc