Blar i NTNU Open på forfatter "Geiker, Mette Rica"
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Critical investigation of TGA sample preparation for composite cements
Machner, Alisa; Bussetti, Lucie; Geiker, Mette Rica; De Weerdt, Klaartje (Chapter, 2015)Thermogravimetric analysis (TGA) is a frequently used technique to investigate the phase assemblages of hydrated cements. However the obtained results are sensitive to the sample preparation. A commonly used technique for ... -
Debonding length in normal concrete and fiber reinforced concrete
Salvemini, Massimiliano (Master thesis, 2016)In this thesis work an investigation program on normal plain reinforced beams (NC) and fibre reinforced concrete (FRC) was performed. In the first part of the study several ways of investigation of the internal cracking ... -
Determination of the pH and the free alkali metal content in the pore solution of concrete: Review and experimental comparison
Plusquellec, Gilles; Geiker, Mette Rica; Lindgård, Jan; Duchesne, Josée; Fournier, Benoit; De Weerdt, Klaartje (Journal article; Peer reviewed, 2017)The durability of concrete is affected by the pH of its pore solution, which is linked to the free alkali metal content. This paper starts with a literature review of methods for determining the pH and/or the free alkali ... -
Determination of the polarization resistance of steel in carbonated fly-ash concrete- effect of measurement technique
Revert, Andres Belda; Hornbostel, Karla; De Weerdt, Klaartje; Geiker, Mette Rica (Chapter, 2017)The polarization resistance (Rp) of a metal gives an indication of the corrosion condition at a given time. The Rp of embedded reinforcement in concrete is usually determined using the linear polarization resistance or the ... -
Determining the free alkali metal content in concrete – Case study of an ASR-affected dam
Plusquellec, Gilles; Geiker, Mette Rica; Lindgård, Jan; De Weerdt, Klaartje (Journal article; Peer reviewed, 2018)In concrete affected by alkali–silica reaction (ASR), aggregates react in the high pH environment and cause deleterious expansion and cracking of the concrete. Leaching of alkali metals from the concrete might therefore ... -
Dolomite calcined clay composite cement - hydration and durability
Machner, Alisa Lydia (Doctoral theses at NTNU;2018:39, Doctoral thesis, 2018)Considerable amounts of CO2 are emitted during the production of cement. One way to reduce these CO2 emissions is to replace some of the cement clinker with supplementary cementitious materials (SCMs). A cement containing ... -
Durability aspects of cracks in concrete: field observations
Geiker, Mette Rica; Danner, Tobias; Hornbostel, Karla; Michel, Alexander (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”. ... -
Durability of cracked SFRC exposed to wet-dry cycles of chlorides and carbon dioxide – Multiscale deterioration phenomena
Marcos-Meson, Victor; Geiker, Mette Rica; Fischer, Gregor; Solgaard, Anders; Jakobsen, Ulla Hjorth; Danner, Tobias; Edvardsen, Carola; Skovhus, T.L.; Michel, Alexander (Peer reviewed; Journal article, 2020)This paper describes an experimental study that comprised the exposure of cracked SFRC members to wet-dry cycles involving chloride and carbon-dioxide for two years. Results indicate that corrosion of steel fibres occurs ... -
Durability testing of low clinker blends - chloride ingress in similar strength mortar exposed to seawater
Geiker, Mette Rica; De Weerdt, Klaartje; Ferreiro Garzón, Sergio; Jensen, Mads Mønster; Johannesson, Björn; Michel, Alexander (Chapter; Peer reviewed, 2017)Resistance to chloride ingress of ten different binders was investigated. Most of the binders were prepared with 35% substitution of a new clinker by limestone filler, calcined clay, burnt shale and/or siliceous fly ash. ... -
Durability-based design: the European perspective
Geiker, Mette Rica; Hendriks, Max; Elsener, Bernhard (Peer reviewed; Journal article, 2021)In Europe, design for the durability of new reinforced concrete structures is currently based on a prescriptive approach. The design, execution (construction) and planned maintenance of a concrete structure have to lead ... -
Durability-related crack width and concrete cover requirements and recommendations from reinforced concrete design codes
Pease, Bradley Justin; Geiker, Mette Rica (Research report, 2018)This report provides an overview of several international code requirements and recommendations from technical committees concerning impact of cracks on durability of reinforced concrete. Most requirements and recommendations ... -
Effect of leaching on the composition of hydration phases during chloride exposure of mortar
Machner, Alisa; Bjørndal, Marie Helene; Justnes, Harald; Hanžič, Lucija; Šajna, Aljoša; Gu, Yushan; Benoît, Bary; Ben Haha, Mohsen; Geiker, Mette Rica; De Weerdt, Klaartje (Peer reviewed; Journal article, 2022)Mortar specimens were exposed to either a 3% NaCl solution or a 3% NaCl+KOH solution for up to 180 days. Exposure to the NaCl solution provoked much more leaching than the NaCl+KOH exposure. Leaching strongly impacted the ... -
Electrical resistivity measurements in steel fibre reinforced cementitious materials
Berrocal, Carlos G.; Hornbostel, Karla; Geiker, Mette Rica; Löfgren, Ingemar; Lundgren, Karin; Bekas, Dimitrios G. (Journal article; Peer reviewed, 2018)This paper reports results from experiments aimed at better understanding the influence of fibre dosage and fibre geometry on the AC frequency needed to determine the DC resistivity of cementitious materials containing ... -
Electro active repair of concrete demonstration of applicability
Polder, Rob; Geiker, Mette Rica (Chapter, 2017)Conventional concrete patch repairs have poor durability: 50% fail within ten years. A major cause is insufficient removal of contaminated concrete and insufficient steel cleaning. Chlorides left behind reactivate the ... -
Electrokinetics Application in Concrete and Well Construction
Jafariesfad, Narjes; Geiker, Mette Rica; Sangesland, Sigbjørn; Gawel, Kamila; Torsæter, Malin (Chapter, 2020)Electrically induced or coupled transport processes including electrophoresis, electroosmosis and electromigration in solutions and porous media under an external electric field have been extensively studied and employed ... -
Estimation of chloride threshold values by use of the square root method and anode ladders
Rygh, Jan-Morten Strømseth (Master thesis, 2021)Abstract will be available on 2023-06-29 -
Experimental and theoretical investigation of crack width calculation methods for RC ties
Tan, Jesus Reignard Medel; Eileraas, Kristoffer; Opkvitne, Ola; Zirgulis, Giedrius; Hendriks, Max; Geiker, Mette Rica; Brekke, Dan-Evert; Kanstad, Terje (Journal article; Peer reviewed, 2018)This paper theoretically and experimentally investigates the semi-empirical formulas recommended by Eurocode 2 (EC2), fib Model Code 2010 (MC2010), and Eurocode 2 with the German National Annex (DIN) for calculating crack ... -
Feasibility study of reactive mass transport modelling to support service life design: Numerical simulation of chloride ingress
Meson, Victor Marcos; Michel, Alexander; Geiker, Mette Rica (Research report, 2022)This report discussed the applicability of reactive mass transport (RMT) models for the durability design of concrete structures. The study focussed on supporting service life modeling of chloride-induced reinforcement ... -
Field Station Sandnessjøen, Effect of cracks in concrete after 25 years - Data report
Danner, Tobias; Belda Revert, Andres; Geiker, Mette Rica (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 ... -
Friedel's salt profiles from thermogravimetric analysis and thermodynamic modelling of Portland cement-based mortars exposed to sodium chloride solution
Shi, Zhenguo; Geiker, Mette Rica; Lothenbach, Barbara; De Weerdt, Klaartje; Garzón, Sergio Ferreiro; Enemark-Rasmussen, Kasper; Skibsted, Jørgen (Journal article; Peer reviewed, 2017)Thermogravimetric analysis (TGA), powder X-ray diffraction (XRD) and thermodynamic modelling have been used to obtain Friedel's salt profiles for saturated mortar cylinders exposed to a 2.8 M NaCl solution. Comparison of ...