• Nanorubber-modified cement system for oil and gas well cementing application 

      Jafariesfad, Narjes; Khalifeh, Mahmoud; Skalle, Pål; Geiker, Mette Rica (Journal article, 2017)
      Flexible cement systems with low shrinkage are more capable than the conventional cement systems to withstand the tensile stresses generated by fluctuation of temperature and pressure in oil and gas wells. In this work ...
    • Nanosized Magnesium Oxide With Engineered Expansive Property for Enhanced Cement-System Performance 

      Jafariesfad, Narjes; Geiker, Mette Rica; Skalle, Pål (Journal article, 2017)
      The bulk shrinkage of cement sheaths in oil wells can result in loss of long-term zonal isolation. Expansive additives are used to mitigate bulk shrinkage. To compensate effectively for bulk shrinkage during the late plastic ...
    • Nedbryting av sprøytebetong i E39 Hopstunnelen og Nesttuntunnelen 

      Fjose, Arnhild (Master thesis, 2015)
      Hopstunnelen og Nesttuntunnelen på E39 like sør for Bergen sentrum, er 2 tunnelar som opna for trafikk i 2002. Tunnelane er landtunnelar med to-vegs trafikk i 1 løp. Dei går gjennom berg av gneis og skifer og er kledd med ...
    • 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 ...
    • Numerical modelling of moisture ingress in cracked concrete 

      Halvorsen, Håkon (Master thesis, 2017)
      Concrete is a construction material which service life can be significantly reduced with the presence of cracks when concrete is exposed to aggressive agents such as chlorides. The current service life models for concrete ...
    • On the effect of calcium lignosulfonate on the rheology and setting time of cement paste 

      Colombo, Alessia; Geiker, Mette Rica; Justnes, Harald; Lauten, Rolf Andreas; De Weerdt, Klaartje (Journal article; Peer reviewed, 2017)
      The effect of softwood calcium lignosulfonate, LSs, on the rheology and setting time of cement paste has been investigated. Two Portland cements with different surface area and C3A content were used. The lignosulfonate was ...
    • On the mechanisms of consumption of calcium lignosulfonate by cement paste 

      Colombo, Alessia; Geiker, Mette Rica; Justnes, Harald; Lauten, Rolf Andreas; De Weerdt, Klaartje (Journal article; Peer reviewed, 2017)
      The aim of this paper is to assess the mechanisms of consumption of softwood calcium lignosulfonate (LSs) by cement paste. The LSs consumption by two different cements (CX and ANL) and two reference materials (CaCO3 and ...
    • Overgangsmotstand i betong 

      Andersen, Kristine (Master thesis, 2013)
      Ved kloridinitiert korrosjon vil det oppstå lokale korrosjonsgroper på armeringen i betong. Særlig i begynnelsen av korrosjonsprosessen, vil forholdet mellom arealet til den lokale korrosjonsgropen (den lokale anoden), og ...
    • Pervious Concrete 

      Torsvik, Øyvind André Hoff (Master thesis, 2012)
      Pervious concrete is a material with a high degree of permeability but generally low strength. The material is primarily used for paving applications but has shown promise in many other areas of usage. This thesis investigates ...
    • Phase development and mechanical response of low-level cement replacements with wood ash and washed wood ash 

      Sigvardsen, Nina Marie; Geiker, Mette Rica; Ottosen, Lisbeth M. (Peer reviewed; Journal article, 2020)
      A significant increase is seen worldwide in the amounts of wood ashes (WAs) produced by the heating and power industry. This study investigates the potential utilisation of two different WAs as low-level cement replacements, ...
    • Portland metakaolin cement containing dolomite or limestone – Similarities and differences in phase assemblage and compressive strength 

      Machner, Alisa; Zajac, Maciej; Ben Haha, Mohsen; Kjellsen, Knut O.; Geiker, Mette Rica; De Weerdt, Klaartje (Journal article; Peer reviewed, 2017)
      The scarceness of high-quality limestone obliges the cement industry to consider alternative supplementary cementitious materials (SCMs) for the production of blended cements. This study investigated the potential usage ...
    • Predicting AEA dosage by Foam Index and adsorption on Fly Ash 

      Jacobsen, Stefan; Ollendorff, Margrethe; Geiker, Mette Rica; Tunstall, Lori; Scherer, George W. (Chapter; Conference object; Preprint, 2012)
      Abstract: The unpredictable air entrainment in fly ash concrete caused by carbon in fly ash was studied by measuring adsorption of Air Entraining Agents (AEA) on the fly ash and by Foam Index (FI) testing. The FI test ...
    • Prinsipper og metoder til reparasjon av betong - Reparasjonsmetoder anvendt i Statens vegvesen 

      Benic, Perica (Master thesis, 2017)
      The Norwegian Public Roads Administration as a government agency has a large literature collection dealing with concrete repair, but the literature spread in several places. The literature is very comprehensive and divided ...
    • Probabilistic Design of Sustainable Reinforced Concrete Infrastructure Repairs Using SIPmath 

      Zirps, Melissa; Lepech, Michael; Savage, Sam; Michel, Alexander; Stang, Henrik; Geiker, Mette Rica (Peer reviewed; Journal article, 2020)
      The design, construction, and operation of civil infrastructure that is more environmentally, socially, and economically responsible over its life cycle from extraction of raw materials to end of life is increasingly ...
    • Recommended practice for reporting experimental data produced from studies on corrosion of steel in cementitious systems 

      Isgor, O. Burkan; Angst, Ueli M; Geiker, Mette Rica; Halmen, Ceki; Hansson, Carolyn M; Pacheco, José F.; Tepke, David; Trejo, David; Vaddey, Naga Pavan (Journal article; Peer reviewed, 2019)
      Experience has shown that many aspects of experimental design for studying steel corrosion in cementitious systems may significantly influence the obtained results. In the absence of standardized methods to study steel ...
    • Reinforcement corrosion in carbonated fly ash concrete 

      Revert, Andres Belda (Doctoral theses at NTNU;2018:230, Doctoral thesis, 2018)
      The cement industry contributes about 8% of the anthropogenic CO2 emissions, partly due to large consumption of cement and the emissions associated with the production (for Portland cement (PC) approximately 800 kg/t). One ...
    • Resistance measurements of high resistance concrete 

      Thoresen, Ann-Marie (Master thesis, 2015)
      The importance of concrete resistivity in durability and service life aspects is widely recognized. Within this project, different measurement approaches were evaluated, with associated limitations and advantages. The ...
    • Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends 

      Shi, Zhenguo; Geiker, Mette Rica; De Weerdt, Klaartje; Østnor, Tone Anita; Lothenbach, Barbara; Winnefeld, Frank; Skibsted, Jørgen (Journal article; Peer reviewed, 2017)
      Chloride binding is investigated for Portland cement–metakaolin–limestone pastes exposed to CaCl2 and NaCl solutions. The phase assemblages and the amount of Friedel's salt are evaluated using TGA, XRD and thermodynamic ...
    • Screening of Low Clinker Binders, Compressive Strength and Chloride Ingress 

      Geiker, Mette Rica; De Weerdt, Klaartje; Ferreiro Garzón, Sergio; Jensen, Mads Mønster; Johannesson, Björn; Michel, Alexander (Journal article; Peer reviewed, 2017)
      This paper reports an initial screening of potential new binders for concrete with reduced CO2- emission. Mortars cured saturated for 90 days are compared with regard to a) compressive strength of mortars with similar ...
    • Screening of untreated municipal solid waste incineration fly ash for use in cement-based materials: chemical and physical properties 

      Ebert, Benjamin A. R.; Steenari, Britt-Marie; Geiker, Mette Rica; Kirkelund, Gunvor M. (Peer reviewed; Journal article, 2020)
      The environmental impact during concrete manufacturing can be reduced by using less cement or using types of cement with high amounts of secondary cementitious materials (SCMs) and fillers. Fly ash from municipal solid ...