Blar i NTNU Open på forfatter "Jacobsen, Stefan"
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Preparation system, salt scaling, absorption and internal damage in the CEN/TS 12390-9 concrete frost test
Børsum, Ole Christian (Master thesis, 2017)Experiments show that the most promising materials to replace key point 2 and 3 in the CEN/TS 12390-9 standard is by using a combination of Sitko Elastic butyl tape and adhesives. The adhesives are "SikaFlex 11FC" and ... -
Pumping of concrete and Mortar - State of the art
Jacobsen, Stefan; Mork, Jon Håvard; Lee, Siaw Foon; Haugan, Lars (COIN Project report;5-2008, Research report, 2008)The pumpability of concrete, or its ability to move through pipes and hoses by the help of a pump while maintaining its fresh and hardened properties, can be quantified as being better the lower the necessary pressure to ... -
Requirements and recommendations to frost durable concrete – an overview
Shpak, Andrei; Fosså, Kjell Tore; Jacobsen, Stefan (Chapter, 2019)Requirements and recommendations for frost durable concrete from standards and specifications from Europe, North-America and Asia, various international organizations and construction projects are reviewed, compared and ... -
Review of Sprayability of Wet Sprayed Concrete
Trussell, Nicholas Henry; Jacobsen, Stefan (Peer reviewed; Journal article, 2020)Wet sprayed concrete quality is affected by more production factors than cast concrete, particularly due to the propulsion through the nozzle and the flash set caused by the set accelerator. Practitioners often use the ... -
Reviewing the Potential of Phase Change Materials in Concrete Pavements for Anti-Freezing Capabilities and Urban Heat Island Mitigation
Asadi, Iman; Jacobsen, Stefan; Baghban, Mohammad Hajmohammadian; Magfouri, Mehdi; Hashemi, Mohammad (Peer reviewed; Journal article, 2023)This study provides an overview of how phase change materials (PCMs) can improve the resistance of concrete pavement to freeze–thaw cycles and mitigate the urban heat island (UHI) effect. The investigation covers different ... -
Revisiting concrete frost salt scaling: On the role of the frozen salt solution micro-structure
Bahafid, Sara; Hendriks, Max; Jacobsen, Stefan; Geiker, Mette Rica (Peer reviewed; Journal article, 2022)We simulate the glue-spall stress due to mechanical interactions between a frozen saline solution (brine-ice composite) and a non-air entrained concrete surface including the impact of the micro-structure of the frozen ... -
Rheology and printability of matrix: effect of filler from manufactured sand vs. copolymer
Sannerud, Stian Ytterstad (Master thesis, 2023)Denne studien undersøker hvordan ulike mengder fyllstoff og superplastifiseringsmiddel påvirker reologi og printbarhet til sementpasta som er modifisert med fyllstoff. Fire metoder ble brukt for å undersøke effekten av ... -
Rheology of matrix and SCC with different mineral fillers and admixtures
Cepuritis, Rolands; Jacobsen, Stefan; Pedersen, Bård; Vikan, Hedda Vestøl; De Weerdt, Klaartje (COIN Projet report;41-2012, Research report, 2012) -
Shape and Size of Particles Scaled from Concrete Surfaces during Salt Frost Testing and Rapid Freeze/thaw in Water
Brun, Marte Beheim; Shpak, Andrei; Jacobsen, Stefan (Peer reviewed; Journal article, 2021)Thickness (T), Length (L), Width (W) and size distribution of scaled concrete particles in frost testing were measured. T (mm) increases with particle size surprisingly similarly for different concrete qualities and frost ... -
Sprayed concrete - effect of accelerator, cracks and composition on compaction, porosity, strength and water transport properties
Trussell, Nicholas Henry (Doctoral theses at NTNU;2023:124, Doctoral thesis, 2023)The research described in this PhD thesis investigated key aspects of sprayed concrete material, with an intention of gaining knowledge to enable greater use of sprayed concrete for permanent tunnel linings. The two unique ... -
Static yield stress measurements on SCC, mortar and matrix
Wirthova, Michaela; De Weerdt, Klaartje; Jacobsen, Stefan (Research report, 2013)The static yield stress of fresh self-compacting concrete and its time dependency was measured in different materials and conditions/methods. First the BML ConTech4 was used at very slow rotation by analysis of the data ... -
The Particle-Matrix model: limitations and further improvements needed
Cepuritis, Rolands; Jacobsen, Stefan; Spangenberg, Jon (Journal article; Peer reviewed, 2017)According to the Particle-Matrix Model (PMM) philosophy, the workability of concrete depends on the properties of two phases and the volumetric ratio between them: the fluid matrix phase (≤ 0.125 mm) and the solid particle ... -
Three dimensional shape analysis of concrete aggregate fines produced by VSI crushing
Cepuritis, Rolands; Garboczi, Edward J.; Jacobsen, Stefan (Journal article; Peer reviewed, 2016)We studied the 3-D shape of concrete aggregate fines with particle sizes between 3 µm and 250 µm produced by high-speed vertical shaft impact (VSI) crushing of rock types from 10 different quarries representing a wide range ... -
Topography studies of concrete abraded with ice
Shamsutdinova, Guzel; Hendriks, Max; Jacobsen, Stefan (Journal article; Peer reviewed, 2019)Topography studies of concrete-ice abrasion were made to proceed in our understanding of the mechanisms of concrete wear by ice on Arctic offshore structures. The effects on various initial surfaces of a B75 normal-weight ... -
Use of excavated rock material from TBM tunnelling for concrete proportioning
Berdal, Torjus (Master thesis, 2017)This thesis studies the possibilities to utilize excavated rock material from tunnel boring machines (TBM) for concrete proportioning. Available alluvial sand deposits are becoming scarce on a global scale and crushed rock ... -
Vurdering av basalt- og stålfibres effekt og mekaniske egenskaper i jetpeler
Høie, Truls Holm; Vermedal, Andreas (Master thesis, 2012)Denne masteroppgaven er en eksperimentell studie av en selvkomprimerende konstruksjonsbetong (styrkeklasse B35) med antiutvaskingsegenskaper armert med enten basaltfiber (monofilament) eller stålfiber. Formålet med oppgaven ... -
Vurdering av basalt- og stålfibres effekt og mekaniske egenskaper i jetpeler
Høie, Truls Holm; Vermedal, Andreas (Master thesis, 2012)Denne masteroppgaven er en eksperimentell studie av en selvkomprimerende konstruksjonsbetong (styrkeklasse B35) med antiutvaskingsegenskaper armert med enten basaltfiber (monofilament) eller stålfiber. Formålet med oppgaven ...