Blar i SINTEF Open på forfatter "De Weerdt, Klaartje"
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Alkali leaching from an ASR-affected dam
Plusquellec, Gilles; De Weerdt, Klaartje; Geiker, Mette Rica; Lindgård, Jan (Lecture, 2018) -
Brukermanual for BetongGUI – analyse og karakterisering av porer på betongoverflaten
Østnor, Tone Anita; Aarstad, Kari; Kaspersen, Kristin; De Weerdt, Klaartje (COIN Project report;51, Research report, 2014) -
Changes in the phase assemblage of concrete exposed to sea water
De Weerdt, Klaartje; Justnes, Harald; Geiker, Mette Rica (Journal article; Peer reviewed, 2014)In the present study the phase changes in an ordinary concrete standing for 10 years in a tidal zone were investigated with a range of techniques. From the exposed surface and inwards different zones had formed. SEM–EDS ... -
Characterisation of concrete surfaces in Askimporten tunnel: COIN project report 45 - 2012
Kaspersen, Kristin; Østnor, Tone Anita; Eide, Mari Bøhnsdalen; De Weerdt, Klaartje (COIN Projet report;45, Research report, 2012)This report gives the findings from a collaboration project between the Norwegian Public Roads Administration (NPRA) and the COIN FA 2.1 project managed by SINTEF Building and Infrastructure which was start in spring ... -
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 ... -
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 ... -
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 ... -
Evaluation of different methods for the determination of the free alkali metal content in the pore solution of concrete
Plusquellec, Gilles; De Weerdt, Klaartje; Geiker, Mette Rica; Lindgård, Jan (Lecture, 2018) -
Excavated rock materials from tunnels for sprayed concrete
Luong, Judy Yuen Wah; Aarstad, Kari; De Weerdt, Klaartje; Bjøntegaard, Øyvind (Chapter, 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 ... -
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 ... -
Fly ash – Limestone Synergy in Ternary Cements. FA 1 Environmentally friendly concrete. SP 1.1 Low carbon-footprint binder systems
De Weerdt, Klaartje; Østnor, Tone Anita; Justnes, Harald (COIN Project report;46, Research report, 2013)The objective is to study the parameters of cements and fly ashes in combination with limestone that would optimize the synergistic chemical reaction between fly ash and limestone that leads to more bound water and thereby ... -
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 (Chapter, 2021)As part of the Norwegian R&D project "ASR – Reliable concept for performance testing" (2014-2019; labelled "KPN-ASR") a fundamental study on ASR kinetics has been performed. The main aim of the study is to assess the ... -
Geopolymers – State of the art : FA 1 Environmentally friendly concrete : SP 1.1 Low carbon-footprint binder systems
De Weerdt, Klaartje (COIN Project report;37, Research report, 2011) -
Microstructure of clinker – fly ash interactions
De Weerdt, Klaartje; Østnor, Tone Anita; Justnes, Harald (COIN Project report;69, Research report, 2015)The first objective was to find out why a white clinker from previous studies has a higher strength potential than the other 3 clinkers tested in the same study, as well as finding out whether or not it contains other ... -
Nordic Concrete rheology workshop – Trondheim, Norway 3–4 October 2011 : FA 2 Competitive constructions : SP 2.1 Robust highly flowable concrete and SP 2.3 High quality manufactured sand for concrete / Klaartje De Weerdt (editor)
De Weerdt, Klaartje (COIN Project report;35, Research report, 2011) -
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 ... -
Portland Clinker-Fly Ash Cements – Relation between Compressive Strength and Microstructure
Justnes, Harald; De Weerdt, Klaartje; Østnor, Tone Anita (Chapter, 2021) -
Practical methods to assess segregation risk of SCC on site. FA: Competitive constructions SP 2.1 Robust and highly flowable concrete with controlled surface quality
Martius-Hammer, Tor Arne; Kjellmark, Gunrid; Smeplass, Sverre; De Weerdt, Klaartje (COIN Project report;59, Research report, 2015)Many of the suggested methods for testing of SCC stability are quite demanding in execution and therefore seldom used in field. Furthermore, questions have been raised about how well they represent the stability problems ...