Blar i NTNU Open på forfatter "De Weerdt, Klaartje"
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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 alkali content in ASR performance-tested concrete
Kermit, Peter Holiman (Master thesis, 2017)Alkali silica reation (ASR) is a common deterioration mechanism of concrete. During ASR, reactive aggregate containing silicon oxide (SiO2) can react with the alkaline fluid in the concrete pores. To test whether a concrete ... -
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 ... -
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 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. ... -
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 ... -
Excavated rock materials from tunnels for sprayed concrete
Luong, Judy Yuen Wah; Aarstad, Kari; De Weerdt, Klaartje; Bjøntegaard, Øyvind (Chapter; Peer reviewed, 2017)Sand extracted from natural resources is widely used in concrete production nowadays. The increase in demand for concrete production has resulted in shortage of natural sand resources, especially in terms of suitable ... -
Experimental carbonation study for a durability assessment of novel cementitious materials
Hanžič, Lucija; Robič, Sebastijan; Machner, Alisa; Bjørndal, Marie Helene; De Weerdt, Klaartje; Gu, Yushan; Bary, Benoît; Carreras, Rosa Maria Lample; Šajna, Aljoša (Peer reviewed; Journal article, 2021)Durability predictions of concrete structures are derived from experience-based requirements and descriptive exposure classes. To support durability predictions, a numerical model related to the carbonation resistance of ... -
Filler and Water Reducer Effects on Sedimentation, Bleeding and Zeta-Potential of Cement Paste
Peng, Ya; Pedersen, Bård; Ng, Serina; De Weerdt, Klaartje; Jacobsen, Stefan (Journal article; Peer reviewed, 2018)Bleeding and sedimentation quantify the stability of fresh cement paste, whereas the addition of fillers and water reducers affect the stability. The effect of various types of fillers and water reducers was investigated ... -
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 ... -
Fundamental study on ASR kinetics - effect of temperature on aggregate reactivity and pore-water composition
De Weerdt, Klaartje; Hemstad, Petter; Justnes, Harald; Østnor, Tone Anita; Rønning, Terje F.; Lindgård, Jan (The International Conference on Alkali-Aggregate Reaction (ICAAR);Theme 4, Chapter, 2021) -
Impact of Accelerated Carbonation on Microstructure and Phase Assemblage
Belda Revert, Andres; De Weerdt, Klaartje; Hjorth Jakobsen, Ulla; Geiker, Mette Rica (Journal article; Peer reviewed, 2018)The paper summarizes preliminary results on characterization of the microstructure and phase assemblage of mortar and concrete samples containing Portland and Portland -fly ash cement carbonated at ... -
Impact of leaching on chloride ingress profiles in concrete
Bjørndal, Marie Helene (Master thesis, 2019)Kloridinitiert armeringskorrosjon er en av hovednedbrytningsmekanismene for armerte betongkonstruksjoner. Klorider trenger igjennom betongoverdekningen over tid og forårsaker korrosjon når de når et kritisk kloridinnhold ... -
Impact of leaching on chloride ingress profiles in concrete
Machner, Alisa Lydia; Bjørndal, Marie Helene; Šajna, Aljoša; Mikanovic, Nikola; De Weerdt, Klaartje (Peer reviewed; Journal article, 2022)To investigate the effect of leaching on chloride ingress profiles in concrete and mortar, we exposed concrete and mortar specimens for 90 and 180 days to two different exposure solutions: 3% NaCl, and 3% NaCl with KOH ... -
In vitro and in situ tests to evaluate the bacterial colonization of cementitious materials in the marine environment
Hayek, Mahmoud; Salgues, Marie; Habouzit, Frédéric; Bayle, Sandrine; Souche, Jean-Claude; De Weerdt, Klaartje; Pioch, Sylvain (Peer reviewed; Journal article, 2020)Civil engineers have a responsibility to take measures to protect marine biodiversity by selecting more bioreceptive construction materials in the design of marine infrastructure, for better biodiversity conservation. In ... -
The influence of carbonation on the biocolonization of cementitious materials in the marine environment
Guéguen Minerbe, Marielle; Feugeas, Françoise; Lors, Christine; Hayek, Mahmoud; Salgues, Marie; Habouzit, Frédéric; Bayle, Sandrine; Souche, Jean-Claude; De Weerdt, Klaartje; Pioch, Sylvain (Peer reviewed; Journal article, 2020)Engineers specializing in civil engineering must integrate into their design measures to protect marine biodiversity, which authorizes the concept of eco-design of marine infrastructure that respects the environment. The ... -
Investigation of leaching in steel fiber-reinforced shotcrete exposed to fresh and saline groundwater in a subsea road tunnel
Manquehual, Cristobal Javier; Jakobsen, Pål Drevland; Holter, Karl Gunnar; De Weerdt, Klaartje; Bruland, Amund (Peer reviewed; Journal article, 2022)The field and laboratory investigations performed in the Frøya subsea road tunnel, constructed between 1998 and 2000, focus on the degree of leaching undergone by steel fiber-reinforced shotcrete in fresh and saline ... -
Investigation of resistivity, porosity and pore solution composition in carbonated mortar prepared with ordinary Portland cement and Portland-fly ash cement
Langedal, Simon Liseth (Master thesis, 2018)This project investigated how carbonation affected resistivity in mortars made with different cement types. The goal was to explain this by investigating the pore solution composition, the pore structure and the moisture ... -
Investigation of the products of the dolomite reaction in Portland cement pastes
Machner, Alisa; Zajac, Maciej; Ben Haha, Mohsen; Kjellsen, Knut Ose; Geiker, Mette Rica; De Weerdt, Klaartje (Chapter; Peer reviewed, 2017)The formation of potentially deleterious reaction products from the reaction of dolomite fines in Portland cement pastes was investigated. It was shown that the reaction of dolomite fines did not follow the commonly accepted ...