Klaartje De Weerdt
Background and activities
Current research and teaching
Since 2014 I work as Professor at the Department of Structural Engineering, NTNU Trondheim. I am dividing my time between research and teaching.
In the autumn I teach Building Materials (TKT4240) to the 1st year Civil Engineering MSc students together with Prof. Tore Kvande. In spring I teach Concrete Structures I (TKT4175) to 3rd year Civil Engineering MSc students together with Prof. Jan Arve Øverli. In addition I contribute to the 4th year Concrete Technology I classes (TKT4215), Concrete Technology for Bridge (KT6004) as part of an experience based MSc program, as well as courses organized by the Norwegian Concrete Association.
Our research team is working on topics oriented towards cement hydration and concrete durability, with other words, concrete from cradle to grave.
Why do we need research on concrete? Cement is the glue of concrete. When it reacts with water it forms solid hydrates which glue the aggregates (stones) in the concrete together to form an artificial rock. The production of conventional Portland cement is associated with large amounts of CO2 emissions. One way of reducing these emissions is by replacing part of the Portland cement with supplementary materials such as limestone, fly ash (by product of coal fired power plants), blast furnace slag (byproduct of iron production), or calcined clay. The resulting composite cements behave differently than the conventional Portland cements both in fresh concrete (e.g. flow, interaction with chemical admixtures etc.) and as a hardened material (e.g. durability and mechanical properties). Research is needed to understand the behavior of these composite cements and to give provide a basis to potentially adapt the practice, regulations and test methods.
Through collaboration with other departments at NTNU and SINTEF we have access to large variety of experimental facilities. For analysis of samples we use amongst others TGA, XRD, SEM, calorimetry, rheology, titration, and ICP-MS. For exposure of concrete we have together with SINTEF access to amongst others carbonation chambers, ASR reactors, spray chambers, frost cabinets.
Scientific, academic and artistic work
A selection of recent journal publications, artistic productions, books, including book and report excerpts. See all publications in the database
- (2021) The square root method for chloride ingress prediction - Applicability and limitations. Materials and Structures. vol. 54.
- (2020) The influence of carbonation on the biocolonization of cementitious materials in the marine environment. Matériaux & Techniques. vol. 108 (2).
- (2020) In vitro and in situ tests to evaluate the bacterial colonization of cementitious materials in the marine environment. Cement & Concrete Composites. vol. 113.
- (2020) The effect of artificial leaching with HCl on chloride binding in ordinary Portland cement paste. Cement and Concrete Research. vol. 130.
- (2019) Comparing chloride ingress from seawater and NaCl solution in Portland cement mortar. Cement and Concrete Research. vol. 115.
- (2019) Effect of carbonation on the pore solution of mortar. Cement and Concrete Research. vol. 118.
- (2019) Macrocell corrosion in carbonated Portland and Portland-fly ash concrete - Contribution and mechanism. Cement and Concrete Research. vol. 116.
- (2018) Impact of Accelerated Carbonation on Microstructure and Phase Assemblage. Nordic Concrete Research. vol. 59 (2).
- (2018) The effect of calcium lignosulfonate on ettringite formation in cement paste. Cement and Concrete Research. vol. 107.
- (2018) Reactivity tests for supplementary cementitious materials: RILEM TC 267-TRM phase 1. Materials and Structures. vol. 51:151 (6).
- (2018) Determining alkali leaching during accelerated ASR performance testing and in field exposed cubes using cold water extraction (CWE) and µXRF. MATEC Web of Conferences. vol. 199.
- (2018) Towards the Understanding of the pH Dependency of the Chloride Binding of Portland Cement Pastes. Nordic Concrete Research. vol. 58 (1).
- (2018) Chloride-binding capacity of hydrotalcite in cement pastes containing dolomite and metakaolin. Cement and Concrete Research. vol. 107.
- (2018) Limitations of the hydrotalcite formation in Portland composite cement pastes containing dolomite and metakaolin. Cement and Concrete Research. vol. 105.
- (2018) Stability of the hydrate phase assemblage in Portland composite cements containing dolomite and metakaolin after leaching, carbonation, and chloride exposure. Cement & Concrete Composites. vol. 89.
- (2018) Filler and Water Reducer Effects on Sedimentation, Bleeding and Zeta-Potential of Cement Paste. Nordic Concrete Research. vol. 58 (N88).
- (2018) Determining the free alkali metal content in concrete – Case study of an ASR-affected dam. Cement and Concrete Research. vol. 105.
- (2018) Carbonation-induced corrosion: Investigation of the corrosion onset. Construction and Building Materials. vol. 162.
- (2017) Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends. Cement and Concrete Research. vol. 95.
- (2017) Friedel's salt profiles from thermogravimetric analysis and thermodynamic modelling of Portland cement-based mortars exposed to sodium chloride solution. Cement & Concrete Composites. vol. 78.