Per Aarsleff A/S, COWI, and Port of Aalborg are currently pushing the limits of green and functional quality in major construction projects.
The three partners are working on a 100-meter quay expansion, a new 250-meter rockfill, and a 27,800 sqm new terminal area in the port’s East Harbour in Aalborg (read more about the expansion).
In the spring, Port of Aalborg, in close cooperation with COWI, decided to tender the project in form of a partnership model instead of a traditional turnkey contract. This decision has so far reduced the project’s CO2 emission by up to 30 percent.
– While our operation composes a small part of our CO2 records, the situation is different with construction. With this project, we wanted to challenge ourselves and the industry on how far we can go within sustainable construction. The result is a significant reduction of CO2 emissions and a blueprint of our new partnership model that we intend to use for similar projects in the future, says Brian Dalby Rasmussen, Project Manager at Port of Aalborg.
A partnership built on trust
Unlike traditional construction projects, contractors and suppliers are in close cooperation during the early stages of the project, while the consulting engineers continue through most of the construction.
– To raise the bar for sustainable constructions, we have forced ourselves to broaden our perspective beyond the usual, seeking inspiration and ideas from outside our organisation. We thus benefit from advising and utilising experts in design, delivery, and more, allowing us to challenge each other and increase quality throughout the project. This has so far reduced the project’s carbon footprint and increased the quay’s efficiency, says Brian Dalby Rasmussen.
Even though partnerships offer several benefits, construction projects rarely use a model like this, says Casper Holmgaard Jensen, Leading Project Manager at the consulting engineering company, COWI:
– Efficient partnerships are usually based on trust between the involved parties, as they are more open compared to standard tenders that often restraints the contractor. This openness is the model’s strength because it allows the project to continuously create value for all parties.
With the partnership agreement, the budget is also defined in advance. If the parties find savings along the way, they will be reinvested in the project. That is also why the quay’s loading capacity will be 7,5 tons per sqm instead of the initial 5 tons, increasing crane location flexibility.
Perfect conditions for recycling
From 2023, new Danish legislation will limit the level of CO2 that new buildings can emit over a 50-year period.
According to Patrick Justesen, Project Manager at Per Aarsleff A/S, the quay expansion is an opportunity to prepare for the coming legislation. Per Aarsleff A/S is a Danish construction group won the partnership tender before the summer holidays in front of two other contractors.
– This project allows us to develop our company in a sustainable direction that will soon be a legal requirement and already is a competitive parameter. We consider this partnership a framework rather than a straitjacket because it makes us think outside the box and find solutions that can raise functionality and sustainability, Patrick Justesen explains and continues:
– The recycled materials are a good example of this. To avoid issues with the contractor, the developer in a traditional tender usually makes sure the project can include recycled materials before it is written into the tender. This hampers opportunities during the project that could potentially result in a cheaper, greener solution.
The initial CO2 reduction of 30 percent was achieved through greener transport, HVO diesel, and recycling of spuns, bollards, and crushed granite — among other things. The crushed granite is a waste material originating from renovated railway lines in North Jutland.
The construction has already commenced, and the new quay area is expected to be commissioned on 1 June 2022.
For further information please contact:
Brian Dalby Rasmussen, Project Manager, Environment & Port Facilities, Port of Aalborg, +45 2920 7252 and firstname.lastname@example.org
Patrick Justesen, Project Manager, Construction, Per Aarsleff A/S, +45 2137 3147 and email@example.com
Casper Holmgaard Jensen, Leading Project Manager, COWI, +45 5640 1188 og firstname.lastname@example.org
Presseservice: Maja Thordahl Schou, Head of Branding & PR, Port of Aalborg A/S,
tel. 22 61 83 08 and email@example.com
Facts: Weighting in the partnership tender
Three contractors were allowed to formulate an offer for the project. In the assessment, three selected criteria were weighted as follows:
- Organisation, collaboration, and sustainability: 50 percent
- References: 30 percent
- Gross margin: 20 percent
Facts: CO2 reducing measures during the quay construction
- Stacked foundations (saving on steel)
- Transport of marine foundations and anchor bars by railway directly to the site
- New concrete recipes tailored for the project (grain size, strength, and cement)
- Recycling of foundations and spun residues as anchor punches
- “Eco” spun profiles rolled exclusively on solar and wind energy (first project in Denmark)
- Recycling of discarded railway carves as a carrier layer and loose coating instead of new stable gravel
- Recycling of surplus stones from the area
- Energy-optimised construction site, including extra insulated sheds with heat pumps
- HVO diesel on construction site
- Purchase of green power for construction site
- Focus on distance in choice of equipment and materials
- Focus on sustainable planning and behaviour
- Collaboration with a socio-economic company on employees and waste management