How environmental impacts can be part of the DB (Design and Build) Tendering? Leena Korkiala-Tanttu Aalto University School of Engineering Geoengineering
Contents Background The decision of environmental impacts Ecoeffiency in DB tendering Conclusions Further research needs Source: NVF slides 2012 2
Background 1 Several research projects published mainly in Finnish All life cycle aspects should be included: economical, environmental and social/performance Ecoefficiency should be taken into account in different phases of planning, in construction and in use The impacts, which are not known well, are usually ignored or have less stress The quality and quantity of the available data limits the studies and their reliability However, the carbon footprint can be evaluated with reasonable quality 3
Background 2 In Finland the infra sector uses about 50 60% of the nonrenewable natural resources and around 1% of the energy The social acceptance together with the actions of road administration are remarkable guidance methods. Pilot projects have shown that LCA and performance based tendering can be used already today better backevaluation methods and tools are needed One of the biggest problems is how the evaluate economical, technical and environmental aspects together. 4
Source: Korkiala-Tanttu et al. 2006 DB Tendering According to latest studies in road sector: more than 90 % carbon dioxide emissions is generated during usage! Design 5
Ecoefficiency in DB tendering A practical project aiming at implementation of ecoefficiency instruments in Finnish DB tendering (2006-2007) Concentrated on the most important environmental impacts, which can be taken into account in DB construction phase Besides above other research questions were: What ecoefficiency means in a DB project? How a contractor can act in an ecoefficient way? How to make a contractor to act in an ecoefficent way? The basic assumption was: the contractor s purpose to minimize costs improves in most cases also ecoefficiency 6
The instruments of orderer and contractor in DB tendering Orderer: Project based solutions, invitations for bid Project plan General guidance of the orderer Performance / Service life (life cycle) Costs/ annual costs Ecoefficiency/ environmental impacts Contractor: Execution of the project Solutions in tenders (technical solutions, quality plan) Company s inhouse solutions (resources, development, methods) Society s guidance 12 June and 2012 impact (social acceptance) 7
Which impact we can affect during construction and maintenance? Many earlier fixed environmental impacts can no longer be affected -> so attention has to put to the right issues The most important impacts, which can be affected, are: the efficient use of material resources (natural materials or crushed rock, energy, recycling) Utilization of local materials (can be of low-quality or refined) The material transportation distances, location of material treatment areas Used machinery, equipments and tools Physical and mechanical impacts (e.g. noise, dust, vibrations) The durability of the structures 8
The construction tasks / phases where the ecological potential is largest Demolition works (e.g. AC, pavement materials) Earth excavations and embankments Rock cuttings Ground improvement methods, reinforcement and lightweight embankment materials Selection of new pavement materials incl. bound layer materials Noise barrier structures Roundabout arrangements during construction work Moulds, casting and support structures (e.g. bridges) Lighting General arrangements of construction work, like timing and timetable 9
Conclusions 1 Infra sector is the biggest user of non-renewable natural resources The importance of carbon footprint impact has increased clearly The basic assumption in DB tendering is that the contractor s purpose to minimize costs improves in most cases also ecoefficiency So cost-effectiveness is part the ecoefficiency, but it is not enough itself The contractors conditions to act in an ecoefficient way has to taken into account in choosing of the contractor 10
Conclusions 2 The social acceptance and guidance of traffic administration should be developed together. The need for project based guidance is obvious Methods can be: Regulations Post-evaluations, Sanctions and Bonus systems 11
Most important research needs Development of the service life-based design methods and tools, including deterioration models Development of an ecoindicator system and its tools Development of the coherent evaluation and procurement methods 12
More information: leena.korkiala-tanttu@aalto.fi 13