Search results for "VDP::Teknologi: 500::Materialteknologi: 520"
showing 10 items of 23 documents
Biochar-pellets as substitute for fossil coal in metallurgical processes
2018
Master's thesis Renewable Energy ENE500 - University of Agder 2018 This thesis serves as a base for later research on substituting fossil coal and coke with biochar in the Norwegian metallurgical industry. Because Norwegian electricity production is almost entirely based on carbon dioxide - neutral hydropower, the nation’s main pollutant is fossil coal. Biochar serves as an alternative to coal but can currently only partially satisfy the quality requirements for use in top-loaded smelting facilities. With comparison to fossil coal, biochar has a higher price and a lower mechanical strength. A coupling of pyrolysis and pelletising is therefore investigated to obtain a sustainable product wit…
Design av en offshore gangbru i fiberarmert polymer
2018
Masteroppgave bygg BYG508 - Universitetet i Agder 2018 Innovation and development are essential for a market in demand of faster, lighter and stronger solutions. As a material with high strength to weight ratio, and good possibilities of being premade, fiber reinforced polymers can meet those requirements. However, it has yet to challenge concrete, steel and aluminum as a structural material. This is the underlying challenge for the problem statement of this assignment, to construct an offshore gangway using fiber reinforced polymers. The design concept is based on existing steel and aluminum constructions within the size range of 25- 30m fully extended. To solve the problem and answer the …
A study of densified biochar as carbon source in the silicon and ferrosilicon production
2019
Abstract Biochar pellets were investigated as renewable reducing agents in substitution of coal and coke in the silicon and ferrosilicon production, where a high reactivity, good mechanical properties and low feedstock costs are appreciated. The usage of pyrolysis oil as binder was investigated as way to improve the quality of the pellets. Norway spruce biochar produced at 500, 800 and 1100 °C, was pelletized blended with pyrolysis oil and lignosulphonate. A second heat treatment was carried out at the same temperatures to evaluate the interaction between biochar and pyrolysis oil and to imitate the thermal stability of the pellets when used in a furnace. Density, tensile strength and mecha…
Advances in Permanent Deformation Modeling of Asphalt Concrete-A Review.
2022
Permanent deformation is one of the dominant asphalt concrete damages. Significant progress has been made to realistically predict the damage. In the last decade, the mechanistic approach has been the focus of research, and the fundamental theories of viscoelasticity, viscoplasticity, continuum mechanics, and micromechanics are applied to develop the material laws (constitutive equations). This paper reviews the advancement of permanent deformation models including analogical, microstructural, and continuum-based methods. Pavement analysis using the nonlinear damage approach (PANDA) is the most comprehensive and theoretically sound approach that is available in the literature. The model cou…
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…
Nytt resirkulert tilslag produsert fra grave- og byggavfall
2020
Master's thesis in Civil and structural engineering (BYG508) Recycled aggregate produced from excavation and construction waste is an important resource. This is because increased use of recycled aggregate will contribute to reduce the amount of waste delivered to landfill, which is an important environmental benefit. Recycled aggregate will replace some of the application areas of natural crushed aggregate, this will reduce the extraction of primary raw materials. The focus of this master thesis is to investigate and document variations in mechanical properties of recycled aggregate produced from excavation mass. The purpose of this is to document the stability of mechanical properties and…
UHPC i norsk brobygging
2020
Master's thesis in Civil and structural engineering (BYG508)
Skjærkapasitet av ultrahøyfast fiberarmert betong – verifikasjon av designstandard
2018
Masteroppgave bygg BYG508 - Universitetet i Agder 2018 Ultra High Performance Fiber Reinforced Concrete (UHPFRC) is a concrete that is still not in use in Norway. This is, as the name implies, a strong concrete, with high ductility from the fibres. To be able to use this concrete in Norway in the future, it is necessary to develop a national standard for UHPFRC. The concrete is in use in some countries, some of these are France, USA, Japan and Canada. The French standard NF P18-710 is based on Eurocode 2, but it is customized for UHPFRC. The method to calculate the shear capacity is different, both because of the concrete and because of the use of fibres. To calculate how much the fibres wi…
Silica Green Stone as an SCM in concrete paving stones production : In order to reduce the total environmental footprint
2021
Master's thesis in Civil and structural engineering (BYG508) The cement industry is responsible for around 7% of the global CO2 emissions. Reducing this number has been on the forefront of the industry's mind for decades, but even with constant improvement and constant reduction in CO2 emissions per tonne cement used, the increasing globalization has kept the emissions high. Research in the industry has discovered supplementary cementitious materials (SCMs), that when partly replacing cement will produce most of the same results. SCMs are by-products from other industries and natural progression has led to the need for new ones. This thesis is, together with UiA, Aaltvedt Betong, SINTEF and…
Post weld heat treatment of welded low alloyed steel pipes : Use of AISI 4130 steel in hydrogen sulfide environment and its post weld heat treatment …
2019
Master's Thesis Civil and Constructional Engineering BYG508 - University of Agder 2019 Based on the results from pre-projectand workcovered by this thesis, no better alternatives to AISI 4130 material was found, neither could it be safely concluded for removal of NACE MR0175/ISO 15156 requirementsin any parts of high-pressure drilling fluid system. SinceAISI 4130 hasshown to be the optimal choice for the system,it was decided to look forimprovementsof welding procedure by optimization ofpost weld heat treatmentforthis steel.Heat treatment is an expansive and time-consuming procedure that,if not done correctly,could weaken the materialand jeopardize the safetyof the system.Inthis thesis, whi…