BTSYM | WORKSHOP REPORT


● Highlights: 47% total CO₂ savings (13,177 tons), 35% per m3


● Key Focus: Carbon reduction and reduced concrete cover


IJboulevard Central Station, Amsterdam On the last section of our presentation, we covered the advantages of using steel fibres for crack width design, from the methodology based on EN 1992-1-1:2023 where a hybrid reinforcement is used (steel fibres + rebar), to obtaining a solution with reduced stress in rebar, leading to smaller, more distributed cracks. IJboulevard Central Station, in Amsterdam, provided


a case study to discuss. It is an underground bicycle parking garage where 4000 Amsterdammers and tourists can park their bicycles. IJboulevard is a hydraulic engineering project, an immersed tunnel, where the outer walls has a crack width-driven design, which allowed for a 10% - 20% cost saving and a potential reduction between 20% to 30% CO2


emissions with a


hybrid SFRC design compared with a traditional steel reinforcement design, while maintaining the same crack width performance.


CONCLUSION Throughout the workshop, the young engineers posed insightful questions, leading to dynamic discussions and a deeper understanding of the topics covered. The event was a testament to the importance of knowledge sharing and collaboration in advancing the field of tunnelling. Bekaert is grateful for the opportunity to work


with BTSYM and to contribute to the professional development of the next generation of engineers. We look forward to future collaborations and continuing to promote sustainable and innovative solutions in the industry.


Authors Vini Casas - Dramix - Underground Solutions – UK & Ireland Ben Vanheuverzwijn - Dramix - Underground Solutions - North, Central & Eastern Europe


Top & Centre:


Bored tunnel lining segments made with steel fibre reinforced concrete (SFRC)


Right:


IJboulevard – Central Station in Amsterdam. Crack Width Design Case Study


28 | June 2025


Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45