Blar i NTNU Open på forfatter "Justnes, Harald"
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Portland Clinker-Fly Ash Cements – Relation between Compressive Strength and Microstructure
Justnes, Harald; De Weerdt, Klaartje; Østnor, Tone Anita (Chapter, 2021)Portland cements were made by mixing 4 different clinkers with 2 gypsum levels and 0-5% limestone powder. The compressive strength after 28 days of curing varied from 40 (5802) to 70 MPa (9718 psi) for mortar with equal ... -
Studying the C-A-S-H composition using advanced data treatment of SEM-EDS hypermaps
Kjellemyr, Petter. (Master thesis, 2023)Kalsium alumina silikat hydrat (C-A-S-H) regnes som hovedproduktet som dannes ved hydratasjon av Portland og Portland kompositt sement og er derfor elementær for styrke og bæreevne for sement. En konvensjonell metode brukt ... -
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 interaction between calcium lignosulfonate and cement
Colombo, Alessia (Doctoral theses at NTNU;2017:20, Doctoral thesis, 2017)Modern concrete applications intensify the need for highly-flowable concretes, which are at the same time durable and possess good mechanical properties. The addition of plasticizers to the concrete mix allows obtaining ... -
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 ... -
Utilization of Recycled Concrete Fines for Carbon Capture and Subsequent Use as Supplementary Cementitious Material
Björklund, Ronja Erika (Master thesis, 2022)Betong är det vanligaste byggmaterialet i världen, men cementproduktionen står för 5-7 % av det totala CO2-utsläppet. [26] För att minska mängden CO2 från tillverkningen blandas ofta cement med mineraliskt tillsatsmaterial ...