Post Tensioning

Macalloy 1030 and S1030.

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.

For more details of failing and proof loads of PT bar, stressing procedures and component dimensions, download the Macalloy Post Tensioning System brochure.

Contact a Macalloy agent today to discuss all things post-tensioning.

Larger Diameter 1030 Bar

Announcing  the launch of a new line of 1030 diameter bar systems, which will complement Macalloy’s existing comprehensive product line. This addition will broaden the current 1030 range and add versatility to our current options.

This new range, which adheres to the high quality standards associated with all Macalloy products, will retain the benefits of the present 1030 series, such as strong tensile qualities, robust thread form, exceptional  fatigue performance, and low  lock off losses

Fatigue Properties
in the S1030

Macalloy are proud to announce their Stainless 1030 post tensioning bar has successfully passed a fatigue test for a prestigious UK project at a UKAS accredited lab in Germany.

The fully threaded Ø32mm bar achieved 2 million cycles without failure at a Stress Range of 80MPa and a 65% Maximum Load. The testing requirements were in accordance with ETAG013, which corresponds to our ETA for the Carbon 1030 Post Tensioning System.

Prior to and following the fatigue test, a static load test was conducted, and the findings showed that the fatigue test had no negative impacts on the bar.

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 tensile strength of 1030 N/mm2 and a fatigue detail category of 64. 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.

Corrosion Protection

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.

For more details on the bar diameters, failing and proof loads, fatigue performance, contact our technical team, technical@macalloy.com or download our brochure.

Our Projects

Our supply chain continues to expand via an international network of Macalloy agents and distributors, ensuring continued growth in the global market.