Wastewater project with sulphate-resistant steel fiber-reinforced concrete segments

The 100,000 tunnel segments used for the main sewer line of the STEP project in Abu Dhabi are exposed to attacks of heat and high chloride and sulphate contents of the surrounding ground. A specially adjusted steel fiber-reinforced concrete mix is to withstand the aggressive boundary conditions.

The wastewater project (Strategic Tunnel Enhancement Program, STEP) of the ultramodern capital city of the United Arab Emirates, Abu Dhabi, gives an idea of the severe conditions, imposed on the durability of concrete, other regions are faced with. The tunnel segments of the miles long main sewer lines, which are driven by means of tunnel boring machines, are installed in an aggressive and hot environment: the fresh concrete may begin to boil there, when hardening, and extreme chloride concentrations are corroding concrete components in just few years. Neither conventional reinforcement nor...

Related articles:

Issue 05/2024

Controlled fiber orientation in steel-fiber-reinforced precast elements

Fiber orientation has a significant effect on the load-bearing capacity of steel-fiber-reinforced concrete (SFRC) components. To optimize this orientation, an extrusion-based concreting method...

Issue 04/2009 Tunneling

Use of steelfiber reinforced concrete in precast tunnel segment production

Steelfibers are more and more frequently used in structural concrete members since they increase the ductility of the concrete matrix by providing the brittle construction material concrete with a...

Issue 11/2014 Holcim (Schweiz) AG

Concrete as versatile building material in material cycles

Holcim (Schweiz) AG has been organizing the concrete conference at ETA Zurich for twenty years now. Therefore, this year‘s conference attended by more than 230 visitors was characterized by the...

Issue 06/2022

Fibers replace reinforcement – Rapid construction with fiber-reinforced semi-precast elements

Installing conventional reinforcement is expensive and time-consuming. This process step is eliminated by using steel fiber reinforced concrete. However, in general, fibers are not used as the only...

Issue 02/2015 An alternative to conventional steel reinforcement?

Steel-fiber-reinforced concrete for lining segments

To an increasing extent, specifiers envisage the use of steel fibers instead of conventional steel reinforcement to resist tensile forces in lining segments of tunnels or large sewers. Particularly on...