Construction Sustainability involves the processes, decisions, and actions during the construction phase of capital projects that enhance current and future environmental, social, and economic needs while considering project safety, quality, cost, and schedule. Most of the currently available published literature and advances in project level sustainability practices have focused on the early Concept Planning and Design phases of capital projects. Knowledge of sustainability practices during the Construction phase of capital projects is still in the early development stages and is highly fragmented; information regarding the selection, assessment, and implementation of construction sustainability solutions has remained largely unavailable or underdeveloped. Moreover, capital project owners and constructors increasingly seek practical guidance and resources to better integrate and evaluate sustainability decisions and actions within project construction services. The dearth of research on effective sustainability practices during the construction phase suggests that higher levels of sustainability attention and effort are needed in this area, in addition to the creation of support guidance and tools. To fill this gap in knowledge, this research has identified 54 unique actions that project teams can apply during construction to enhance the overall sustainability of their project. These construction phase sustainability actions (CPSAs) have been cataloged, characterized, and evaluated to facilitate their consideration and implementation by project teams. To further support the selection process and implementation of these actions, the research team developed a high-level strategic work process, a spreadsheet-based CPSA Screening Tool, and additional in-depth guidance for three CPSAs. In addition, both input- and output-oriented construction sustainability metrics have been developed and identified. Equipped with the findings from this study, owners and construction contractors will be better prepared to implement sustainability actions during the construction phase of capital projects. / text

State Highway Agencies (SHAs) are being forced to focus more on rehabilitation, resurfacing, and reconstruction of existing roadways rather than the construction of new facilities. These activities can create several challenges when they must be conducted on roadways with high traffic volumes. This research identified numerous strategies that can be implemented by SHAs that have the potential to influence the overall success of roadway projects with high traffic volumes. This research also created a framework for when to implement these different strategies. These strategies were identified through an in-depth literature review and through case studies conducted on highway projects that were under construction. Through the case studies the different strategies were documented within the context that warranted their use. Information from the case studies was collected and documented through interviews and site visits. The strategies identified through this research were used to create four matrices that summarize the research findings. A general matrix was created to show the motivating project conditions that warrant the use of each strategy. A public relations matrix was created to display the influence the impacted road user groups have on public relations and information strategies. A traffic management matrix was created to show different types of traffic management strategies and the potential impact they will have on the project. Finally, an interdependency matrix was created to show groups of strategies that are related to each other or require the use of other strategies to be able to influence the success of the project. These matrices could be further developed to create a set of guidelines that could be used by a SHA during the planning phases of a roadway project.

Construction productivity improvement is a key concern for construction companies and the industry. Productivity in construction is a complex issue because: (1) it is influenced by multiple factors interactively; and (2) it is measured in different forms and at different levels of detail for different purposes. This objective of this research is to develop an internal Benchmarking and Metrics (BM&M) model for industrial construction enterprises to help them understand and implement mechanisms for continuously improving construction productivity. Processes are developed in the model for: 1. Measuring and reporting craft labour productivity performance in a consistent form for the purposes of internal benchmarking and comparison with a selected third-party benchmark, 2. Examining productivity influencing factors in two categories with respect to construction environment factors and construction practices implementation, 3. Establishing a productivity performance evaluation model to understand the mechanisms by which the environment factors and construction practices impact construction productivity, and 4. Conducting strategic gaps analysis of construction practices implementation within a company aimed at achieving “best in class” and continuous improvement. System functions in the model are validated through functional demonstration by applying statistical analysis on data collected by the designed benchmarking process and metrics from an industrial construction company. It is concluded that the model developed can be effectively used to understand the impact of practices implementation levels on construction productivity.

Recognized as one of the main obstacles to sustainable development, climate change is caused and accelerated by the greenhouse gas (GHG) emissions generated from all energy end-user sectors. The building sector alone consumes around 40% of all produced energy worldwide. Reducing this sector’s energy consumption has therefore come into focus as one of the key issues to address in order to meet the climate change challenge.Implementing sustainable construction practices, such as LEED, can significantly reduce the building’s energy and water consumption. Prescribing these practices may however encounter several barriers that can produce other than intended results. Since the beginning of 2008 Dubai mandates a LEED certification for the better part of all new constructions developed within the emirate, nevertheless the success of this regulation is debatable.This thesis identifies the barriers the introduction of the sustainable construction practices in Dubai faced and analyses the reasons why the regulatory and voluntary policy instruments were not effective in dealing with these barriers. Understanding these barriers as well as the merits and weaknesses of the policy instruments will help future attempts to introduce sustainable construction practices.To put the research into context a literature review of relevant printed and internet sources has been performed. In order to further understand the barriers the construction market in Dubai faced, qualitative observational research methods have been used. In addition the input of different key stakeholders with unique knowledge of the construction market was deemed to be necessary. Finally, for purposes of verification, the research relied on quantitative methods using different databases that provide detailed information about construction projects in the United Arab Emirates.The thesis concludes that several barriers, such as a) financial, b) market related, c) behavioral and organizational, d) political and structural, d) technical and e) information barriers hindered the introduction of sustainable construction practices in Dubai. Furthermore the introduced policy mechanisms were not effective in providing clarity on the scope of the policies and environmental goals, failed to provide financial incentives to investors or developers and considered only weak enforcement mechanisms.As a final outcome the thesis presents a number of suggestions that should increase the number of LEED certified projects. These suggestions include changes in the current regulations, the introduction of new policy mechanism such as a building code and major changes to the energy policy such as the correction of the utility prices and the liberalization of the energy market.

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