Browsing NTNU Open by Author "De Weerdt, Klaartje"
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Adsorption Isotherms for Lignosulfonate in Cement with Fly Ash and Blast Furnace Slag
Aasheim, Marius Ekanger (Master thesis, 2016)Plasticizers are used to increase the workability of cement in its fresh state. When adding plasticizers to a paste, the molecules chemically adsorb on the surface of cement particles. This interaction between the plasticizer ... -
Alkali - Silica Reactions in Concrete Dams - Alkali Leaching in the Votna Dam
Vurucu, Havvagul (Master thesis, 2016)Alkali - silica reaction (ASR) is a common durability problem for concrete. There are three conditions that need to be fulfilled for the reaction to occur: sufficient moisture, alkali reactive aggregates and high alkali ... -
Alkali Aggregate Reactions (AAR) in concrete. The Norwegian endeavour during more than 3 decades of research
Wigum, Børge Johannes; Lindgård, Jan; De Weerdt, Klaartje; Pedersen, Bård Magne; Rønning, Terje F. (Chapter, 2022)It is now more than 80 years since Alkali Aggregate Reactions (AAR) first were reported as a deleterious deterioration mechanism in concrete. In Norway, AAR was recognised in the late nineteeneighties. Norwegian experience ... -
Blended cement with reduced CO2 emission- utilizing the fly ash-limestone synergy
De Weerdt, Klaartje (Doktoravhandlinger ved NTNU, 1503-8181; 2011:32, Doctoral thesis, 2011)During cement production large amounts of CO2 are emitted, about 1 tonne CO2 per tonne clinker, if no measures are taken. About 40% originates from fuel combustion, grinding and other operations, and 60% from the de-carbonation ... -
Brukermanual for BetongGUI – analyse og karakterisering av porer på betongoverflaten
Østnor, Tone Anita; Aarstad, Kari; Kaspersen, Kristin; De Weerdt, Klaartje (COIN Projet report;51-2014, Research report, 2014) -
Calibration Technique for Quantitative Chloride Measurements with µ-XRF in Cementitious Materials
Kaasa, Rannei Ida (Master thesis, 2018)Corrosion due to ingress of chlorides is one of the major deterioration mechanisms of reinforced concrete structures exposed to seawater or de-icing salts. The chlorides are transported through the porous cement paste in ... -
Carbonation resistance of concrete and mortar containing novel low clinker cement
Bjørndal, Marie Helene (Student paper, others, 2019)Corrosion of reinforcement steel is a major deterioration mechanism for reinforced concrete structures. Corrosion can be caused by the carbonation of concrete. In this report we test the carbonation resistance of a novel ... -
Carbonation-induced corrosion: Investigation of the corrosion onset
Revert, Andres Belda; De Weerdt, Klaartje; Hornbostel, Karla; Geiker, Mette Rica (Journal article; Peer reviewed, 2018)There are different views in the literature on the relationship between the location of the carbonation front and the onset of reinforcement corrosion. Theoretically, corrosion starts when the carbonation front reaches the ... -
Cement paste chemistry and its relation to concrete durability
Hemstad, Petter (Doctoral theses at NTNU;2023:258, Doctoral thesis, 2023) -
Chloride binding in concrete: recent investigations and recognised knowledge gaps: RILEM Robert L’Hermite Medal Paper 2021
De Weerdt, Klaartje (Journal article; Peer reviewed, 2021)A theoretical understanding of chloride binding is urgently needed if we are to use the new low-CO2 composite cements in reinforced concrete structures exposed to chloride-loaded environments. The empirical models and ... -
Chloride binding in Portland composite cements containing metakaolin and silica fume
Babaahmadi, Arezou; Machner, Alisa; Kunther, Wolfgang; Figueira, João; Hemstad, Petter; De Weerdt, Klaartje (Peer reviewed; Journal article, 2022)This paper investigates how the composition of Portland composite cements affects their chloride-binding properties. Hydrated cement pastes prepared with a reference Portland cement and composite Portland cements containing ... -
Chloride Ingress Determination in Offshore Concrete Structures Using µ-XRF
Slotten, Joachim; Vådahl, Erik Bjørnstad (Master thesis, 2019)Formålet med denne masteroppgaven var å se nærmere på µ-XRF som målemetode for kloridinntrenging i offshore betongkonstruksjoner. For å evaluere bruk av µ-XRF til dette formålet, ble den sammenlignet med to andre analysemetoder: ... -
Chloride Ingress in Concrete - A Sensitivity Analysis of the Input Parameters in the fib Model for Chloride Ingress and a Validation of the Model for Short Exposure Times
Nissen, Thomas (Master thesis, 2016)Chloride transport in concrete is a rather complex process. There are numerous different models one can use to estimate chloride ingress in concrete. The fib model code presents a model based on an error function solution ... -
Chloride-binding capacity of hydrotalcite in cement pastes containing dolomite and metakaolin
Machner, Alisa; Zajac, Maciej; Ben Haha, Mohsen; Kjellsen, Knut Ose; Geiker, Mette Rica; De Weerdt, Klaartje (Journal article; Peer reviewed, 2018)In this study, we investigated well-hydrated cement pastes containing dolomite and metakaolin cured at 38 °C or 60 °C, which were exposed to NaCl or CaCl2 solutions of various concentrations. We determined the chloride-binding ... -
Cold water extraction (CWE). Procedure for the determination of the alkali content and pore solution composition
Plusquellec, Gilles; De Weerdt, Klaartje (Research report, 2017)This document describes the cold water extraction (CWE) procedure which allows to determine the free alkali content of hydrated cement paste, mortar or concrete. The calculation of the pH using the thermodynamic modelling ... -
Comparing chloride ingress from seawater and NaCl solution in Portland cement mortar
De Weerdt, Klaartje; Lothenbach, Barbara; Geiker, Mette Rica (Journal article; Peer reviewed, 2019)This study investigates whether chloride ingress testing can be done using NaCl solution instead of seawater when assessing the performance of concrete in marine conditions. Seawater contains besides sodium and chlorine ... -
Comparison of the condition of steel fiber-reinforced shotcrete with water-glass and alkali-free activators after more than 20 years of service in a subsea road tunnel
Manquehual Mery, Cristobal Javier; Jakobsen, Pål Drevland; Holter, Karl Gunnar; De Weerdt, Klaartje; Danner, Tobias Alexander; Bruland, Amund (Peer reviewed; Journal article, 2022)The in-service condition of steel fiber-reinforced shotcrete installed more than 20 years ago as single-shell rock support lining in the Nordkapp subsea road tunnel was investigated. The novelty of this study is the ... -
Correlating the development of chloride profiles and microstructural changes in marine concrete up to ten years
Fjendbo, Simon; Fjendbo, Simon; Sørensen, Henrik E.; De Weerdt, Klaartje; Jakobsen, Ulla Hjorth; Geiker, Mette Rica (Peer reviewed; Journal article, 2022)After ten years of marine exposure, chloride and calcium profiles and petrographic data were obtained from the tidal and submerged zones of six concrete panels differing in binder composition. Moisture and portlandite ... -
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 ... -
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 ...