Corrosion protection is key in the durability of cable structures

The monostrand technology:
full corrosion barrier and high fatigue resistance


One of the most important move in this area is the development of the Monostrand technology -for individually protected strands, that was carried out by Freyssinet at the end of the eighties and installed on a few bridges as soon as 1988. The objective was to get a protection that is durable, flexible enough to accommodate deformation and elongations and that can connect to the anchorage in a proper way.

Several years of R&D lead to the industrial development of the wax and HDPE (High Density Polyethylene) sheathed semi-bonded mono-strand for which the sheathing is semi-bonded to the steel strands thanks to a qualified amount of wax. The HDPE sheathing is tight enough on the strand so that thermal expansion is the same for both materials.

Key advantages

01. High corrosion protection

Triple barrier corrosion protection: the strands are galvanised, waxed and coated with HDPE.

02. Redundancy

Each strand is individually protected and anchored, which provides a high level of performance and durability.

03. Modularity

The number of strands is adjusted to the required force in the cable.

04. High durability

Improved service life, thanks to the proven endurance of the Monostrand system.

05. Optimized design

Steel grade up to 2160 Mpa strand for reduced cable size.

06. Longest track record

The first major reference for Monostrand system was the Normandy Bridge in France, which paved the way for modern stay cable technology.

07. A solution for each project

Monostrand systems are tailored to meet all your needs, from long-span cable-stayed bridges to suspension bridges.

08. Easy maintenance

Possible replacement of a partial cable section.

Cable systems: our range of strand technologies

Monostrand® technology

The strands are galvanized, waxed and individually sheathed with a continuous wear resistant HDPE sheathing, providing each strand with a triple protection system. The system is suitable for 1860 and 2160 MPa steel grades, and compliant with all national and international standards. A compact version is available for specific project requirements, whenever the wind fairing surface of the cable layers should be reduced. Applications: cable-stayed bridges, suspension bridges, extradosed bridges, stadiums.
  • Individual tensile elements for redundancy
  • Individual corrosion protection system,
    triple corrosion barrier
  • Cable force preserved,
    no cable elongation after initial tensioning

Cohestrand® technology

The specificity of the Cohestrand technology is the co-extrusion of a proprietary bonding resin and polyethylene onto the strand, with precise control of the extrusion parameters to achieve a sufficient bond. This process is carried out at Freyssinet’s production sites and is subject to strict quality control. The minimum shear resistance of the compound, between the outer sheath and the seven-wire strand, is 4 MPa at 20°C. This method ensures that the triple barrier strand protection is of industrial quality, consistency and reliability.
In order to reduce the cost of the technology, a specific Locally Cohesive Strand (LCS) has been developed for extradosed bridges. Applications: cable-stayed bridges, suspension bridges, extradosed bridges.
  • Full locking of sliding force
  • Continuity and redundancy of corrosion protection
    through pylon saddles or suspension collars
  • Cable force preserved,
    no cable elongation after initial tensioning

Carbon Fiber Reinforced Polymer strand

The Carbon Fiber Reinforced Polymer (CFRP) is an advanced composite material with the following advantages: high strength, light weight, no corrosion and excellent fatigue resistance.
Unidirectional CFRP can hence be used as an alternative to steel cables when the total weight of the cabled structure needs to be reduced. Applications: cable-stayed bridges, stadiums.
  • Flexible cable installation and replacement
  • Inert to corrosion mechanisms
  • Cable force preserved,
    no cable elongation after initial tensioning

Strands technologies

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