Search results for "53"
showing 10 items of 2908 documents
Approaches and strategy development towards more sustainable ultra-high-performance concrete
2023
The main research objective of this thesis is to investigate how the use of UHPC can contribute to improving the sustainability of the concrete industry by investigating alternative approaches and develop a comprehensive strategy. Some cost aspects have been discussed to indicate whether the strategy is commercially viable. The research involved six studies: Paper I describes a background study to identify directions for a more sustainable concrete industry. Papers II–V report on how approaches to improve sustainability influence the mechanical properties of UHPC. These studies include both literature reviews and experimental activities. Paper VI concludes the research by developing a compr…
Development of Motion Control Systems for Hydraulically Actuated Cranes with Hanging Loads
2023
Automation has been used in industrial processes for several decades to increase efficiency and safety. Tasks that are either dull, dangerous, or dirty can often be performed by machines in a reliable manner. This may provide a reduced risk to human life, and will typically give a lower economic cost. Industrial robots are a prime example of this, and have seen extensive use in the automotive industry and manufacturing plants. While these machines have been employed in a wide variety of industries, heavy duty lifting and handling equipment such as hydraulic cranes have typically been manually operated. This provides an opportunity to investigate and develop control systems to push lifting e…
Towards Efficient Use of Cement in Ultra High Performance Concrete
2021
Abstract This paper presents an investigation on substituting the cement content with an inert material, in a typical locally produced UHPC mix. A structured literature review was performed to enrichen the discussion and to benchmark the results towards already reported investigations in the research society. Investigations on cement substitution in UHPC are frequently reported. However, usually the cement is substituted with other binding materials – often pozzolanic by-products from other industries. Reports from investigations on the use of inert materials for cement substitution in UHPC seem scarce. An experimental program that included a total of 210 test specimens was executed. This p…
Lowering environmental impact from UHPC, utilizing industrial by-products
2018
Ultra High Performance Concrete (UHPC) is a material having some properties superior to ordinary concrete, such as strength and durability. Production ofUHPC often includes large amount of cement, leading to high cost and environmental footprint. This study aimed at demonstrating the potential of reducing both cost and environmental impact from production of UHPC, by reducing cement content through substitution with inert materials. Locally available industrial by-products were utilized as ag-gregates, as another mean to reduce cost and environmental impact. It has been proven possible to substitute 40% of the cement with inert materials, without significantly reducing the compressive stren…
Prosessorientert planlegging : Tverrfaglig analyse av flyt og forutsetninger i byggeprosjekter
2018
Masteroppgave bygg BYG508 - Universitetet i Agder 2018 Introduction: The construction industry is undergoing constant changes and the complexity of today’s buildings is increasing. Simultaneously, there is a constant pressure to deliver projects faster and cheaper, without sacrificing quality. Lean construction is a philosophy that seeks to reduce waste, create flow and improve plan-reliability in construction projects. This master thesis is written in collaboration with Skanska, investigating the possibilities of location-based planning and flowoptimization in the interior works of the Bjørndalen KF5 residential project, using an interdisciplinary approach. Methodology: The study is based …
Livssyklusanalyse (LCA) av vegger i bindingsverk med kontinuerlig isolasjon : En sammenlignende LCA-studie av ytterveggsystemer i tre for miljøoptima…
2020
Master's thesis in Civil and structural engineering (BYG508) The building industry istaking measures in order to reduce its large carbon footprint. However, even more ecofriendly building solutions need to be used. External walls are constructed with a great usage of materials -in addition to being the building component were large portions of heat escape.This study answers the research question “How does timber-framed external walls with continuous outer insulation(BKI)perform from an environmental point of view?”. The software SimaPro is used to compare different types of external walls with regards to CO2-emissions. The findings in the study show thatBKI wallsdo have good energy efficien…
Evaluating the effect of mineralogy and mechanical stability of recycled excavation materials by Los Angeles and micro-Deval test
2021
This paper presents the findings of the mechanical performance of recycled excavation materials (REM). The aim was to document the stable performance of REM and to suggest its suitability for unbound applications. Test operations were performed at different schedules with the Los Angeles (LA) and micro-Deval (MD) test machine. X-ray diffraction (XRD) analysis was performed to examine the effect of mineralogy on the performance of REM. The results showed that REM showed consistent LA performance, but significant variations were observed in MD values. XRD results showed that up to 20% of chlorite and mica minerals had no influence on the LA performance of REM.
Implementation of Building Information Modeling in Infrastructure Construction : Lessons from Norway and Vietnam
2021
Industrialization, innovation, and infrastructure are important drivers in improving employment and income (United Nations, 2015b). To meet the United Nation’s Sustainable Development Goals by 2030, developing countries need to invest more in research and innovation that aims to improve their infrastructure (United Nations, 2015a). More basic infrastructure, such as roads, information and communication technology (ICT) systems, and electrical power grids, is essential to improving standards of living and protecting the environment in developing countries (ibid.). Construction researchers have found that the use of ICT increases construction efficiency. Adwan and Al-Soufi (2016) classified 2…
Conceptual design of a concrete staircase based on topology optimization : A feasibility study on the development and application of topology optimiz…
2021
Master's thesis in Civil and structural engineering (BYG508)
Sustainability assessment of an apartment building containing reinforced concrete or cross-laminated timber (CLT)
2019
Master's Thesis Civil and Constructional Engineering BYG508 - University of Agder 2019 Today, the construction industry contributes to40% of the world’s energy consumption and greenhouse gasemissions(GHGs). According to theIntergovernmental Panel on Climate Change’s(IPCC)report, the greenhouse gas emissions must be reduced by 40-50 percent to limit Global Warmingto 1.5 degreesrather than 2 degreesby 2030. The United nation’s (UN)SustainabilityGoals are the world's common work plan to stop climate change by 2030. To achieve the above goals, it is crucial for the construction sectors to look forbetter,alternative construction materials as top concern to sustainability and environmental issues…