Blar i SINTEF Open på forfatter "Danner, Tobias"
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25 years of field exposure of pre-cracked concrete beams; combined impact of spacers and cracks on reinforcement corrosion
Geiker, Mette Rica; Danner, Tobias; Michel, Alexander; Belda Revert, Andres; Linderoth, Oskar; Hornbostel, Karla (Peer reviewed; Journal article, 2021)The state of corrosion of three pre-cracked concrete beams was investigated after 25 years of marine exposure (atmospheric, tidal and submerged). The influence of inadequate plastic spacers was found to overrule the possible ... -
Acid Activation of Natural Rocks - A Case Study with Norwegian Anorthosite and Phosphoric Acid
Danner, Tobias; Justnes, Harald (SINTEF; 2021:00335, Research report, 2021)Norway is rich in natural resources, especially different types of rocks that could potentially serve as raw material for alternative binder concepts like alkali activated binders or magnesium phosphate and magnesium hydroxy ... -
Alkali-reduced Bauxite Residue as Novel SCM
Danner, Tobias; Sletnes, Malin; Justnes, Harald (Peer reviewed; Journal article, 2020)Bauxite residue is a major waste stream available in large volumes globally that can cause risks to the surrounding environment (e.g. ecotoxicity) when disposed and stored by conventional methods. There is yet no large-scale ... -
Aske fra energigjenvinning kan erstatte sement
Engelsen, Christian John; Døssland, Line Teigen; Danner, Tobias; Justnes, Harald; Heyn, Richard H. (Journal article, 2022)t forskningsprosjekt fra SINTEF viser at aske fra forbrenningsanlegget på Haraldrud har gode egenskaper som sementerstatter. Resultatene åpner for økt sirkulær økonomi i byggenæringen. -
Bauxite Residue as Supplementary Cementitious Material – Efforts to Reduce the Amount of Soluble Sodium
Danner, Tobias; Justnes, Harald (Peer reviewed; Journal article, 2020)This study investigates the feasibility of using bauxite residue (BR) as supplementary cementitious material (SCM) for the cement and concrete industry. It is shown from pastes of BR and calcium hydroxide, that BR is highly ... -
Calcareous smectite clay as a pozzolanic alternative to kaolin
Danner, Tobias; Norden, Geir; Justnes, Harald (Journal article; Peer reviewed, 2019)The hydration of cement pastes with addition of a kaolinite rich clay (Clay A) and a calcareous smectite rich clay (Clay B) was investigated with isothermal calorimetry, in-situ XRD, PXRD, TGA and EPMA. Portland cement was ... -
Characterisation of calcined raw clays suitable as supplementary cementitious materials
Danner, Tobias; Norden, Geir; Justnes, Harald (Journal article; Peer reviewed, 2018)The potential use of two raw clays (Clay A: kaolin; Clay B: calcareous montmorillonite) as supplementary cementitious material (SCM) in blended cements was investigated. Cement replacement in mortars by 20% calcined Clay ... -
Characterisation of calcined raw clays suitable as supplementary cementitious materials
Danner, Tobias; Norden, Geir; Justnes, Harald (Journal article; Peer reviewed, 2018)The potential use of two raw clays (Clay A: kaolin; Clay B: calcareous montmorillonite) as supplementary cementitious material (SCM) in blended cements was investigated. Cement replacement in mortars by 20% calcined Clay ... -
Determining alkali leaching during accelerated ASR performance testing and in field exposed cubes using cold water extraction (CWE) and μXRF
Lindgård, Jan; Østnor, Tone Anita; Fournier, Benoit; Lindgård, Øyvind; Danner, Tobias; Plusquellec, Gilles; De Weerdt, Klaartje (Journal article; Peer reviewed, 2018)Considerable leaching of alkali metals was documented, both in concrete samples exposed to accelerated laboratory testing and field samples. CWE allowed to quantitatively determine the free alkali metal profiles as a ... -
Durability aspects of cracks in concrete: field observations
Geiker, Mette Rica; Danner, Tobias; Hornbostel, Karla; Michel, Alexander (Nordic Concrete Research;17, Chapter, 2019)The research presented in this paper briefly summarises findings from a project on impact of cracks on reinforcement corrosion within the Norwegian Public Roads Administration’s R&D program “Ferry-free coastal route E39”. ... -
Effekt av Magnesiumklorid på Betongbestandighet
Danner, Tobias; Vikan, Hedda (Statens vegvesens rapport;652, Research report, 2016)Bruk av salt til is- og snøsmelting er en viktig del av dagens vinterdrift på vei og bruer. I dag er det i hovedsak NaCl som er i bruk. Det er velkjent at MgCl2 er i tillegg til andre positive egenskaper mer effektiv til ... -
Evaluating the effect of mineralogy and mechanical stability of recycled excavation materials by Los Angeles and micro-Deval test
Adomako, Solomon; Thorstensen, Rein Terje; Akhtar, Naureen; Norby, Mariann; Engelsen, Christian John; Danner, Tobias; Barbieri, Diego Maria (Chapter, 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 ... -
Field Station Sandnessjøen, Effect of cracks in concrete after 25 years - Data report
Danner, Tobias; Belda Revert, Andres; Geiker, Mette Rica (Statens vegvesens rapporter;374, Research report, 2020)Tre opprissede betongbjelker støpt med forskjellige bindemiddelsammensetninger ble undersøkt etter 25 års marin eksponering ved feltstasjon Sandnessjøen. Betongbjelkene ble undersøkt med tanke på effekten av riss på ... -
Kloridbestandighet av 1980-tallets offshorebetong; 30 års eksponering ved DNV GLs feltstasjon i Bergen
Rodum, Eva; Danner, Tobias (Statens vegvesens rapporter;504, Research report, 2019)I perioden 1983-1988 produserte Norwegian Contractors i Hinnavågen store prøveelementer (betongsøyler) med offshore-betong for utplassering ved DNV GLs marine feltstasjon i Bergen. Søylene ble produsert i henhold til ... -
Mineralogical Sequence of Self-Healing Products in Cracked Marine Concrete
Danner, Tobias; Jakobsen, Ulla Hjorth; Geiker, Mette Rica (Journal article; Peer reviewed, 2019)Self-healing of cracked concrete beams after 25 years of marine exposure was investigated. The extent of self-healing and the chemical and mineralogical composition of the self-healing products were characterized, and ... -
Non-destructive Test Methods for Corrosion Detection in Reinforced Concrete Structures
Hornbostel, Karla; Danner, Tobias; Geiker, Mette Rica (Peer reviewed; Journal article, 2020)Several inspection methods can be used to assess the corrosion state of steel reinforcement in concrete. Especially for periodical field surveys and monitoring, non-destructive testing (NDT) methods are to be preferred as ... -
Recycled aggregates derived from excavation materials — mechanical performance and identification of weak minerals
Adomako, Solomon; Engelsen, Christian John; Danner, Tobias; Thorstensen, Rein Terje; Barbieri, Diego Maria (Peer reviewed; Journal article, 2022)The present study investigates the mechanical performance of recycled aggregates derived from excavation materials (REM). REM is blended with different quantities of recycled phyllite materials (RPM) and is investigated ... -
Self-healing and Chloride Ingress in Cracked Cathodically Protected Concrete Exposed to Marine Environment for 33 years
Danner, Tobias; Hornbostel, Karla; Geiker, Mette Rica (Lecture, 2020) -
Self-healing and Chloride Ingress in Cracked Cathodically Protected Concrete Exposed to Marine Environment for 33 Years
Danner, Tobias; Hornbostel, Karla; Strømme, Øyvind; Geiker, Mette Rica (NTNU report;R-1-2019, Research report, 2019-11-22)Cracks facilitate ingress of aggressive substances. Depending on the exposure, this might lead to early reinforcement corrosion initiation. Possible self-healing of cracks may reduce their long-term impact, and conditions ... -
The Influence of Production Parameters on Pozzolanic Reactivity of Calcined Clays
Danner, Tobias; Justnes, Harald (Journal article; Peer reviewed, 2018)Calcined clays are gaining increasing interest as future supplementary cementitious materials for the production of blended cements. Besides the mineralogy, the right production conditions can affect the pozzolanic activity ...