Blar i NTNU Open på forfatter "Jacobsen, Stefan"
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Ice abrasion of concrete, background theory and testing at the NTNU laboratory
Bøhn, Olav Dybvik (Master thesis, 2012)Ice abrasion has been reviewed. Concrete and ice and their most important properties in accordance to ice abrasion have been studied. Concrete strength and contact pressure between ice and concrete is found to be important ... -
Ice Abrasion on Fiber Reinforced Concrete: A Study on the Effects of Various Types of Fiber and the Reliability of the Laboratory Measurements
Sætre, Kristian (Master thesis, 2014)The purpose of this study has been to compare how fiber reinforced concretes, using different amounts and types of fiber, behave compared to standard offshore concretes without fiber in regard to ice abrasion. The effect ... -
Ice abrasion testing of high performance concrete for offshore structures
Shamsutdinova, Guzel; Hendriks, Max; Fosså, Kjell Tore; Jacobsen, Stefan (Chapter, 2019)Offshore concrete structures exposed to drifting sea ice have abrasion of the concrete surface caused by the mechanical contact between ice and concrete in the order of 0.1 to 1 mm per year. The concrete-ice abrasion ... -
Ice abrasion testing of HP concrete for offshore structures
Shamsutdinova, Guzel; Hendriks, Max; Fosså, Kjell Tore; Jacobsen, Stefan (Chapter, 2019)Offshore structures can be exposed to drifting sea ice. The wear (abrasion) of the concrete surface caused by the mechanical contact between ice and concrete is in the order of 0.1–1 mm per year. The concrete-ice abrasion ... -
Influence of crushed aggregate fines with micro-proportioned particle size distributions on rheology of cement paste
Cepuritis, Rolands; Jacobsen, Stefan; Smeplass, Sverre; Mørtsell, Ernst; Wigum, Børge J.; Ng, Serina (Journal article; Peer reviewed, 2017)This paper presents a study on how crushed concrete aggregate fines affect rheological properties of cement paste. The fines (≤250 μm) were produced by high-speed vertical shaft impact (VSI) crushing of rock types from 10 ... -
Influence of rheology on the pumpability of mortar : P 2 Improved construction technology SP 2.4 Workability
Vikan, Hedda Vestøl; Jacobsen, Stefan (COIN Project report;21, Research report, 2010)The rheological and material parameters determining the pumpability of fresh self-compacting mortar have been studied in full-scale (70 m Ø 50 mm rubber hose and screw pump with max capacity 7 m3/h). Concrete pressure ... -
Laboratory Measurements of Ice-Concrete Abrasion with Different Types of Ice Quality
Greaker, Nicolai Segaard (Master thesis, 2014)Ice-concrete abrasion has been investigated by review of lab- and field studies and by laboratory testing. The specific objective of this thesis has been to investigate the possible effects of different ice qualities on ... -
Macroporosity and water penetration measurements of sprayed concrete: Open vs closed macroporosity, size, shape, orientation and anisotropy
Hårr, Magne Stangeland; Kjeka, Gaute (Master thesis, 2022)Hensikten med oppgaven var å undersøke makroporøsitet og permeabilitet til sprøytebetong. Dette innebar å (1) undersøke åpen og lukket makroporøsitet målt med PF-metoden, (2) sammenligne luftinnhold i ulike betongtyper ... -
Macroporosity and water penetration measurements of sprayed concrete: Open vs closed macroporosity, size, shape, orientation and anisotropy
Hårr, Magne Stangeland; Kjeka, Gaute (Master thesis, 2022)Hensikten med oppgaven var å undersøke makroporøsitet og permeabilitet til sprøytebetong. Dette innebar å (1) undersøke åpen og lukket makroporøsitet målt med PF-metoden, (2) sammenligne luftinnhold i ulike betongtyper ... -
Measurement of particle size distribution and specific surface area for crushed concrete aggregate fines
Cepuritis, Rolands; Garboczi, Edward J.; Ferraris, Chiara F.; Jacobsen, Stefan; Sørensen, Bjørn Eske (Journal article; Peer reviewed, 2017)Different methods for measuring particle size distribution (PSD) and specific surface area of crushed aggregate fines (⩽250 μm), produced by high-speed vertical shaft impact (VSI) crushing of rock types from different ... -
Microproportioning - Rheology of filler modified cement paste (matrix) with crushed aggregate fines and pozzolana
Foslie, Juni Christine Myhre (Master thesis, 2018)This thesis presents a study on how crushed aggregate fines and pozzolana affects the rheological properties of a cement paste. Two approaches for investiagations of rheology properties were performed; mixing and measurements ... -
Mikroproporsjoneringsmodellering med måling av maksimum partikkelpakning i fillermodifisert pasta og viskositet på pastavæske
Sihaklang, Metathip (Master thesis, 2019)Det er tre hovedmetoder som ble undersøkt: måling av maksimum partikkelpakning ved sentrifugering, ekstraksjon av overflødig væske (EF) i fersk sementpasta og måling av viskositet av EF. Disse metodene ble utført i ... -
Modeling of Water Transport in Highly Saturated Concrete with Wet Surface During Freeze/thaw
Gong, Fuyuan; Jacobsen, Stefan (Journal article; Peer reviewed, 2018)Wet frost exposure is a usual environmental condition for cement-based materials (CBM) during winter and the most common way of frost testing in the lab. In this study, the temperature gradient, pressure gradient, and the ... -
Nordic Concrete Research workshop: “Accelerated freeze-thaw testing of concrete”, Lyngby, 20th April 2022
Hasholt, Marianne Tange; Fridh, Katja; Spörel, Frank; Jukka, Lahdensivu; Helsing, Elisabeth; Müller, Matthias; Faheem, Abdul; Sleiman, Sara Al Haj; Jacobsen, Stefan (Journal article; Peer reviewed, 2022)A one-day Nordic Concrete Research workshop on “Accelerated freeze-thaw testing of concrete” attracted approx. 30 participants. The workshop included presentations on various aspects, such as observed frost damage in the ... -
Optimization of offset in the workability function
Sydtangen, Magnus moen (Master thesis, 2023)This master’s thesis investigates the relationship between the flow resistance ratio and the superplasticizers to cement content ratio (sp/c). Additionally, it examines the suitability of the workability function in relation ... -
Particle interaction potential parameters and effect of copolymer superplasticizer in cement paste: an overview
Haghighat, Negin; Spangenberg, Jon; Jacobsen, Stefan (Chapter, 2022)The rheological properties of fresh cement-based materials determine their applicability for various types of use such as extrusion, 3D printing, self-compacting (SCC) placement, spraying, pumping, etc. Proper control of ... -
Particle Size Distribution and Specific Surface Area Measurements with X-ray SediGraph on Filler, Cement and Fly Ash
Sosa, Patricia Ysabel (Master thesis, 2017)The focus of this thesis is producing the Particle Size Distribution (PSD) of filler, cement and fly ash using X-ray sedimentation technique. The Micromeritics SediGraph III Plus (5125) applies the sedimentation theory to ... -
Pilestredet park – strenge krav til gjenbruk. Hva betyr det for betongen ?
Jacobsen, Stefan; Harrysson, Torleif (Research report, 2005)SINTEF NTNU Betonginformasjonsdag -
Predicting AEA dosage by Foam Index and adsorption on Fly Ash
Jacobsen, Stefan; Ollendorff, Margrethe; Geiker, Mette Rica; Tunstall, Lori; Scherer, George W. (Chapter, 2012)Abstract: The unpredictable air entrainment in fly ash concrete caused by carbon in fly ash was studied by measuring adsorption of Air Entraining Agents (AEA) on the fly ash and by Foam Index (FI) testing. The FI test ... -
Prediction of rheological properties of filler modified cement paste from constituent properties, flow measurements and modelling
Skare, Elisabeth Leite (Doctoral theses at NTNU;2022:38, Doctoral thesis, 2022)The world is facing a sand crisis due to depletion of natural deposits of good quality construction sand. Replacement of natural sand is crucial to curb the impact of the crisis. Though several alternatives exist, this ...