Anders Vennstrom, Thomas Olofsson, William Fawcett, Attila Dikbas, Esin Ergen
Determination and Costing of Sutainiable Construction Projects: Option Based Decision Support
Abstract: The building stock in Europe accounts for over 40% of the final energy consumption in the European Union. Moreover, the construction sector is one of the largest producers of industrial waste contributing 40-50% of landfill in some EU countries. A common way of creating a forward planning for optimal resource efficiency in construction project is to apply Life cycle cost (LCC) and Life Cycle Assessment (LCA) in the decision process. There are, however, difficulties in assessment of the impact of the whole project on the environment and estimating its sustainability. The EU funded 7th framework project CILECCTA sets out to develop a LCCA (Life Cycle Cost and Analysis) tool supporting the determination and costing of sustainable project strategies.Current LCC software can assist the decision making process in simulating different alternatives for the design, build, maintenance and demolition of assets – allowing both client and builder to determine the favoured alternative for them. Through linking LCC and LCA methodologies, the CILECCTA project will go one stage further by enabling an assessment of the impact of the whole project on the environment and estimating its sustainability. It will also include the recently developed new generation of Whole Life Costing (WLC) methodology including a probabilistic approach to the development of sustainable WLC strategies, using a real options approach. This paper sets out the framework of current LCCA tools and the challenges in developing a modular LCCA engine integrating asset-related data in price banks and life cycle inventories across Europe. The research leading to these results has received funding from the European Community's Program FP7/2007-2013 under grant agreement no 229061.
Keywords: Decision support, Life Cycle Cost, Life Cycle Assessment, real option analysis
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Robert Lundkvist, Anders Vennstrom
Requirements of an Inter-Project Digital Inspection System
Abstract: Characteristics of the construction industry are mobility, project orientation and the set-up of new organization in every project. The products are one-of-a-kind and seldom develop beyond the prototype phase. This is often suggested as reasons for the the low development of productivity in the construction industry, and continuous improvement and experience feedback becomes harder to accomplish from project to project. The production results are handed over from contractor to client through different inspections. The inspector creates a "punch list" with all found faults, for the contractor to correct before the construction work can be finally accepted. These often lengthy lists on documented faults are full of information that can be useful for the contractor company’s learning and experience feedback process. A previous study shows that contractors acknowledge this potential use, but they need some sort of IT system to support the inter-project management of the inspection information collected.The aim of this paper is to analyze what type of information is valuable in an inter-project inspection information system (IPSIIS), to enhance learning and feedback in construction contractor companies. Interviews have been carried out with experienced inspectors and construction engineers, and a “best practice” for building inspections in Sweden is described. The requirements of a digital IPSIIS are analyzed, both from a regulatory point of view and from the perspective of making the inspection data useful for knowledge mining. Based on best practice, a strategic approach for the design of the user interface is presented for the successful acceptance in the industry. Some principals for codification are also discussed.
Keywords: experience feedback, information technology, inspection, quality
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