Macalloy was the first company in the world to develop a post-tensioning bar system in the 1940s. The product has since evolved to include a unique fatigue-resistant thread form that provides low lock-off losses on stressing.
Benefits of Post Tensioning Bar.
Fatigue resistant thread
Ideal for pre-stress concrete construction
Threaded to suit your requirements (fully and end threaded)
Can be cut to length on site
High impact resistance
Used for a variety of temporary and permanent constructions
Patented Macalloy thread allows low lock-off losses during stressing
The Macalloy 1030 and S1030 post-tensioning bar systems are high strength with superior fatigue properties. The Macalloy Post Tension bar provides an ultimate yield strength of 1030 N/mm2.
The Macalloy Post Tension bar is available in diameters from 26½ to 75mm and lengths of up to 11.8m. Longer lengths can be achieved by joining bars together with couplers. Custom sizes are available on request.
The 1030 bar is a carbon chrome steel bar with high strength properties achieved by cold working or heat treatment.
The stainless-steel version (S1030) is a martensitic nickel-chrome alloy steel, hardened during the manufacturing process. Available in diameters 20 to 75mm and lengths of 6m. again, longer lengths can be achieved by joining bars together with couplers and custom sizes are available on request.
We can also supply a range of accessories including nuts, washers, end plates and ducts.
For corrosion protection, Macalloy can supply bars with a factory-applied Denso Tape. This is a grease-impregnated tape, which has technical and cost-saving benefits over traditional duct and grout solutions.
Foundation Anchor Bolt Solution for on-shore Wind Turbines
The benefits of using Macalloy bars have been widely recognised across the construction industry, and they are now used extensively for wind turbine projects.
The high strength Macalloy steel bars, with their excellent fatigue properties, are ideally suited for use as wind turbine anchor bolts, in anchor bolt cages and in onshore concrete gravity-based foundations.
The Macalloy bar offers technical advantages over the standard 8.8 and 10.9 bolts – and can deliver significant cost savings.
The Macalloy bar has an ultimate failing load of 1035 N/mm2 and a fatigue detail category of 80. It can be comfortably stressed to 70% (or even up to 80%) of its failing load during installation.
The higher strength and fatigue properties allow for smaller diameter, and/or fewer bars to be used in the foundation, saving money on materials as well as installation and maintenance costs.
The Macalloy bars have excellent relaxation properties and low lock-off losses, helping to reduce installation time and eliminate or reduce the regular need to re-stress bolts after installation.
The Denso tape solution provides significant advantages over the traditional duct and heat shrink tubing applications and is a more cost-effective solution. Denso tape provides guaranteed corrosion protection, for well over the usual maximum 30 years design life of an onshore wind turbine.
We can offer duct and accessories for grouting purposes, and also offer alternative solutions for corrosion protection of exposed ends.