Browsing SINTEF Open by Author "Justnes, Harald"
Now showing items 21-39 of 39
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Fibre reinforced lightweight aggregates
Bernhardt, Markus; Tellesbø, Hilde; Justnes, Harald; Wiik, Kjell (Journal article; Peer reviewed, 2014)Carbon steel fibre reinforced lightweight aggregates (LWA) were produced in a pilot scale rotary kiln. Narrow size fractions as well as not-sieved (asreceived) material were investigated according to European standards ... -
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 ... -
Hardening accelerators for fly ash blended cement. FA 1 Environmentally friendly concrete. SP 1.1 Low carbon-footprint binder systems
Justnes, Harald; Ng, Serina (COIN Project report;71, Research report, 2015)A former developed hardening accelerator for fly ash blended cement should be replaced with another formulation free from thiocyanate and preferentially with equal or better performance in terms of compressive strength. ... -
In Situ Measurements of the Chemical Stability of a Cast Aluminum Alloy Embedded in a Cement Paste with a High Amount of Supplementary Cementitious Material
Runningen, Ingvild; Westermann, Ida; Furu, Trond; Justnes, Harald (Peer reviewed; Journal article, 2021)In traditional reinforced concrete, the alkaline pore solution which passivates the steel rebars will get neutralized with time in an exposed environment. Therefore, to prevent corrosion initiation, the permeability of the ... -
Low porosity through optimized particle packing of concrete matrix. COIN P1 Advanced cementing materials and admixtures : SP 1.5 Low porosity/ permeability
Justnes, Harald (COIN Project report;13, Research report, 2009) -
Low water permeability through hydrophobicity : COIN Project P1 advanced cementing materials : SP 1.5 F Low porosity / permeability
Justnes, Harald (COIN Project report;1, Research report, 2009)The durability and aesthetic appearance of concrete may be improved by the addition of hydrophobizing agents as a consequence of reduced water permeability. Hydrophobizing agents lead to less water absorption at the same ... -
Mechanical properties of lightweight aggregates
Bernhardt, Markus; Tellesbø, Hilde; Justnes, Harald; Wiik, Kjell (Journal article; Peer reviewed, 2013)Lightweight aggregates (LWAs) were successfully produced both in a pilot-scale rotary kiln and in a laboratory chamber furnace. The mechanical properties of LWA were investigated in detail applying the European standard ... -
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 ... -
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 cement hydration in the vicinity of electrically polarized conductive surfaces
Gawel, Kamila; Wenner, Sigurd; Jafariesfad, Narjes; Torsæter, Malin; Justnes, Harald (Peer reviewed; Journal article, 2022)Hardening of Portland cement-based materials in vicinity of electrically conductive surfaces, especially when the surfaces are electrically or galvanically polarized, can lead to both morphological and chemical changes in ... -
Pozzolana from minerals – State of the art. COIN P1 Advanced cementing materials and admixtures. SP 1.4F Alternative pozzolans
Justnes, Harald (COIN Project report;16, Research report, 2009) -
Rheology of blended cements with superplasticizers : FA: Environmentally friendly concrete structures : SP 1.1 Binders with low emission and reduced resource consumption
Ng, Serina; Justnes, Harald (COIN Project report;58, Research report, 2015) -
The effect of additives on the properties of lightweight aggregates produced from clay
Bernhardt, Markus; Justnes, Harald; Tellesbø, Hilde; Wiik, Kjell (Journal article; Peer reviewed, 2014)In an attempt to improve the properties, lightweight aggregates were produced from clay with the addition of Na2CO3, SiO2, Fe2O3, and Fe in quantities between 2 and 10 wt% and examined with respect to strength, density and ... -
The effect of calcium lignosulfonate on ettringite formation in cement paste
Colombo, Alessia; Geiker, Mette Rica; Justnes, Harald; Lauten, Rolf A; De Weerdt, Klaartje (Journal article; Peer reviewed, 2018)The effect of a softwood calcium lignosulfonate, LSs, on the ettringite formed in cement paste was investigated. Two Portland cements, mainly differing in surface area and C3A content, were used. The effect of LSs addition ... -
The effect of heat treatment and cooling rate on the properties of lightweight aggregates
Bernhardt, Markus; Tellesbø, Hilde; Justnes, Harald; Wiik, Kjell (Journal article; Peer reviewed, 2014)Lightweight aggregates (LWA) were produced from clay in the laboratory. After firing different heat treatments and cooling rates were applied andthe resulting material was investigated with respect to strength and ... -
The Influence of Production Parameters on Pozzolanic Reactivity of Calcined Clays
Danner, Tobias; Justnes, Harald (Journal article; Peer reviewed, 2018)Calcined clays are gaining increasing interest as future supplementary cementitious materials for the production of blended cements. Besides the mineralogy, the right production conditions can affect the pozzolanic activity ... -
TIGHT-Sement til injisering : state of the art
Aarstad, Kari; Skjølsvold, Ola; Justnes, Harald (Rapport (SINTEF Byggforsk);SBF 2015 A0056, Research report, 2015) -
Transformation Kinetics of Burnt Lime in Freshwater and Sea Water
Justnes, Harald; Escudero-Oñate, Carlos; Garmo, Øyvind Aaberg; Mengede, Martin (Peer reviewed; Journal article, 2020)Calcium oxide (CaO), also known as burnt lime, is being considered as a possible treatment to reduce the negative impact of sea urchins on tare forests in northern coastal waters and blue-green algal blooms in the surrounding ...