Blar i UiS Brage på forfatter "Vrålstad, Torbjørn"
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Plug & abandonment of offshore wells: Ensuring long-term well integrity and cost-efficiency
Vrålstad, Torbjørn; Saasen, Arild; Fjær, Erling; Øia, Thomas; Ytrehus, Jan David; Khalifeh, Mahmoud (Peer reviewed; Journal article, 2019-10)There is an upcoming "P&A wave" of wells that need to be permanently plugged and abandoned, especially in mature, offshore areas such as the North Sea and Gulf of Mexico. It is important to ensure that plugged wells do not ... -
Rheological properties of rock-based geopolymer slurries with different dispersant and counterion combinations
Alsvik, Inger-Lise; Vrålstad, Torbjørn; Perumal, Priyadharshini; Saasen, Arild (Peer reviewed; Journal article, 2023)The production of Ordinary Portland Cement (OPC) is responsible for a significant part of global CO2 emissions. A potential alternative to OPC is alkali-activated materials (AAM), which do not contain OPC and are not ... -
Vurdering av egenskaper til geopolymerbetong Assessment of the properties of Geopolymer concrete
Shanmugam, Anojan; Årbu, Haakon Venås (Master thesis, 2023)Through an analysis of tests, the aim was to identify the optimal concrete mix for geopolymers, a mix that maintains the high mechanical properties of geopolymer materials while providing improved durability and environmental ...