KrampeHarex GmbH & Co. KG
Pferdekamp 6-8
59075 Hamm

 +49 02381 977 977
F +49 02381 977 955

Office hours

Mon - Thurs 7 a.m. - 5 p.m.
Fri 7 a.m. - 2 p.m.

Shipping times

Mon - Fri 6 a.m. - 2 p.m.

Project information

CO₂ savings:

3,686 t

KrampeHarex GWP 257 kg CO₂-Eq. compared to steel fibers from other manufacturers with a GWP of 800-2100 kg CO₂-Eq.

This corresponds to approximately 57 transatlantic flights from Frankfurt to New York.


A century project

The city-state of Singapore covers a significant proportion of its drinking water requirements with a modern rainwater and wastewater treatment system. The national water authority PUB laid the foundations for this back in the 1990s with the huge “Deep Tunnel Sewerage System” project, or DTSS for short. 

The second phase of the project (DTSS Phase II) involves the construction of around 50 kilometers of tunnels deep underground in the island state. Their task is to transport the wastewater produced in the south and west to the new Tuas Water Reclamation Plant. You can see the route of the tunnels in the diagram on the right.

“Honest communication at eye level and very good technical support! Thank you KrampeHarex for the cooperative partnership in this important project.”

Alexander Bahr
CPL Manager
Ed. Zublin AG – DTSS Phase 2 Project, Contract T-07

Using the right concrete mix design

to combat microbial induced corrosion

Concrete corrosion is a serious problem in waste water and sewage tunnels. Colonization with microorganisms can cause sulphuric acid to form in the tunnels, which can lead to biogenic sulphuric acid corrosion.

Inorganic and organic sulphur compounds in wastewater are converted by bacteria into sulphides, which then become hydrogen sulphide. The resulting sulphur oxidized on the concrete surfaces is converted to sulphuric acid by bacteria and the acid attack on the concrete begins.

The MIC concrete project was developed and tested as steel fibre reinforced concrete with high resistance to biogenic sulfuric acid corrosion in order to meet the required 100-year durability requirement.

DE 60/0,9 H

The tunnel's best buddy

The reinforcement of the inner lining is ensured with DE 60/0.9 H from KrampeHarex. This cold-drawn wire fibre has a length of 60 mm, a diameter of 0.9 mm and a tensile strength of 1,900 MPa.

It provides optimal reinforcement for the tunnel while increasing durability, service life and significantly reducing CO₂ emissions compared to conventional reinforcement with steel bars.

Would you like to find out more about this fibre?

Get in touch

Further references from

the sector tunnel construction

DTSS2 T-07 Inner Lining


Read more

Wakrah & Wukair Drainage Tunnel

Doha | Qatar

Read more

Stormwater System

Dubai | UAE

Read more


Hengsberg | Austria

Read more

Do you have questions
about the project?

We look forward to hearing from you.

Ja, ich habe die Bedingungen gelesen und akzeptiere sie.