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EPOXY COATED AND FILLED STRAND (ECF strand)

(ASTM A882/A882M – 04, ISO 14655 1999-12-15, JSCE-E 141-2010)

  • High corrosion protection
  • Enough toughness at construction sites
  • Excellent resistibility against fretting fatigue
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With rising requirement for durability prestressed concrete structure, SEI developed the anticorrosive epoxy coated and filled strand. The strands are coated with epoxy resin which is fully filled among each wires, giving it high corrosion protection and outstanding resistibility against fretting fatigue.

Figure
Classification of strand JIS G3536
(Japan Industrial Standard)
Ultra-High tensile strand
Dia. without coating 9.3mm 12.7mm 15.2mm 15.7mm 17.8mm 21.8mm
Dia. with coating 10.5mm 13.9mm 16.4mm 16.9mm 19.0mm 21.8mm
Tensil strength 1720N/mm2 1860N/mm2 1860N/mm2 2230N/mm2 2040N/mm2 2000N/mm2
Characteristic ultimate force ≥88.8kN ≥183kN ≥261kN ≥335kN ≥387kN ≥573kN
Load at 0.2% permanent elongation ≥75.5kN ≥156kN ≥222kN ≥285kN ≥330kN ≥495kN
Normal cross sectional area 51.61mm2 98.71mm2 138.7mm2 150.0mm2 190.0mm2 285.9mm2
Unit weight 405g/m 774g/m 1101g/m 1180g/m 1500g/m 2244g/m
Relaxation ≤6.5% ≤2.5% *
≤6.5%
≤2.5% *
≤6.5%
≤6.5% ≤6.5% ≤6.5%
Thickness of epoxy coating Average thichness of crown part:400-900µm
Each thickness of crown part:400-1200µm
*In accordance with ASTM A882-04, ISO 14655-1999 and JSCE-E 141-2010

※ Low relaxation type of ECF has different chemical components from JIS G3536

Lineup for ECF Strand

Protection Diameter
mm
Description Appearance Applications
Single
Layer
12.7-15.2 FLO-GARDTM
(Basic Type)
PHOTO External cable
Stay cable
FLO-BONDTM
(High adhesion type)
PHOTO Internal cable
Stay cable
Ground anchorage
Double
Layer
12.7-15.2 PE tightly sheathed
FLO-GARD
PHOTO External cable
Stay cable
12.7-15.2 PE loosely sheathed
FLO-BOND
PHOTO Ground anchorage
19S 15.2
27S 15.2
31S 15.2
37S 15.2
Semi-prefabricated FLO-GARD/FLO-BOND cable PHOTO External cable
Stay cable
Triple
Layer
12.7-15.2 PE tightly sheathed and wax filled FLO-GARD PHOTO External cable
Stay cable

SEMI-Prefabricated strand Cable with ECF Strand

PHOTO

19S 15.2

SEMI-Prefabricated strand Cable is HDPE coated multiple Epoxy coated and filled strand. It is prefabricated with certain length adjustability and results in very short erection time on site.

Size 19S 15.2 27S 15.2 31S 15.2 37S 15.2
Normal diameter [mm] 95 115 120 130
HDPE thickness [mm] 5.0 5.0 5.5 7.0
Min. Breaking strength [kN] 4,959 7,047 8,091 9,657
Min. Yield strength [kN] 4,218 5,994 6,882 8,214
Cross-sectional area [mm2] 2,635.3 3,744.9 4,299.7 5,131.9
Mass of Strand [kg/m] 24 36 40 48

Coating performance of ECF Strand

Bending characteristics of coating

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The coating develops no abnormalities even under severe conditions: such as, when would around a cylinder mandrel with a diameter 32 times that of the strand diameter.

Adhesion and continuity of coating under tensioning

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The coating follows the steel wire and maintains continuity up until the wire breaks. Even after breakage, the coating demonstrates uniform behavior with the steel wire.

Comparison with Conventional Strands in 1000 hours in salt spray test

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Can be anchored from directly above the coating with an anchorage

Wedge for ECF Strand

Condition of ECF strand and an exclusive wedge after loading up to rated tension load.

It is possible to bite through the epoxy coating into steel directly.

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