Browsing NTNU Open by Author "Jacobsen, Stefan"
Now showing items 21-40 of 77
-
Effect of materials on sedimentation of cement paste
Peng, Ya; Jacobsen, Stefan (Chapter; Peer reviewed, 2013)A conceptual model for the stability of paste was proposed and an experimental system, HYdroStatic Pressure Test (HYSPT), was developed for detecting the sedimentation of fresh cement paste. By accurate measurements of the ... -
Effect of Set Accelerator on Capillary Suction and Porosity of Concrete – Cast Samples with Constant Water/Binder Ratio
Trussell, Nicholas Henry; Cepuritis, Rolands; Jacobsen, Stefan (Peer reviewed; Journal article, 2022)Alkali-free set accelerators are added at the nozzle to ensure rapid set of wet sprayed concrete. The accelerator affects the strength development, porosity and transport properties, and hence the durability, of the sprayed ... -
Effect of Set Accelerator on Properties of Wet Sprayed Concrete
Trussell, Nicholas Henry; Cepuritis, Rolands; Jacobsen, Stefan (Peer reviewed; Journal article, 2022)This paper describes sprayed concrete experiments varying the set accelerator dose. Literature on the hydration of cement with modern alkali-free set accelerators is reviewed and two full scale wet spraying experiments ... -
Effect of silica fume, steel fiber and ITZ on the strength and fracture behavior of mortar
wang, xiao hui; Jacobsen, Stefan; Lee, Siaw Foon; He, Jianying; Zhang, Zhiliang (Journal article; Peer reviewed, 2010)Two sets of parameters known to affect the quality and thickness of the interfacial transition zone (ITZ), i.e. water/binder ratio and content of silica fume were varied in a series of mortars without and with steel fiber. ... -
Empirical Modelling of Lithium Mitigation for Alkali-Silica Reactivity
Vacher, Marc; Jacobsen, Stefan (Journal article; Peer reviewed, 2022)The Alkali-Silica Reaction (ASR) is a deleterious concrete chemical reaction that has been studied a lot since its discovery in 1940. The reaction produces a highly hygroscopic silica gel that swells into the pores of ... -
An evaluation of the ice melting during concrete-ice abrasion experiment
Saidmurodov, Saidkomil; Jacobsen, Stefan; Hendriks, Max; Shamsutdinova, Guzel (Journal article; Peer reviewed, 2022)The process of ice melting during abrasive interactions with concrete is essential in a variety of contact phenomena. In this paper, we refer to abrasive tests for different samples of concrete with roughness in the range ... -
Fibre-reinforced Self-compacting Concrete: Prediction of Rheological Properties
Øfsdahl, Ellen (Master thesis, 2012)The purpose of this thesis is to investigate the relationship between measured rheology and proportioning properties with particular attention to maximum packing fraction, thickness of fiber lubricating matrix and fiber ... -
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 ... -
FlowCyl: one-parameter cement paste rheology test developed at NTNU, Norway
Cepuritis, Rolands; Jacobsen, Stefan; Skare, Elisabeth Leite; Spangenberg, Jon; Smeplass, Sverre; Mørtsell, Ernst (Journal article, 2019)The FlowCyl is a simple flow viscometer – a modification of the Marsh Cone test apparatus developed to characterize cement pastes and grouts. The FlowCyl gives a one-parameter characterisation of rheology called the flow ... -
Foam Index measurements on combinations of Air Entraining Agents, Superplasticicers and Fly ash/cement/filler powder mixes
Jacobsen, Stefan; Nordahl-Pedersen, Henrik; Omer Rasool, Hawar; Lødemeø, Øyvind Olsen (Research report, 2015)A series of Foam Index measurements were made with 7 different AEAs (abietic acids/resins/tall oil/tensides), 1 copolymer SuperPlaticizer, 2 different Fly Ashes, 1 blended (80/20 OPC/FA) cement, 2 different OPC and 2 ... -
FOAM INDEX MEASUREMENTS ON MIXES OF AIR ENTRAINING AGENTS, SUPERPLASTICIZERS AND FLY ASH-CEMENT- FILLER BLENDS
Jacobsen, Stefan; Nordahl-Pedersen, Henrik; Omer Rasol, Hawar; Lødemel, Øyvind Olsen; Tunstall, Lori; Scherer, George W. (Chapter, 2016)Foam Index (FI) measurements were made to investigate the foaming efficiency of different AEAs with varying cements (OPC, blended), fly ashes (FA) and fillers, and the effect on foaming of mixing sequence of AEA and SP. ... -
Freeze-Warping Box - Measuring the Deflection of a Composite Specimen
Stensholt, Margrethe Kuekiatngam (Master thesis, 2018)The freeze-warping box is used to measure the bi-material deflection of a small composite specimen beam during a freeze-thaw cycle. This bi-material deflection is caused by the thermal mismatch between the composite's ... -
Freezing induced stresses in concrete-steel composite beams and effect of air voids
Jacobsen, Stefan; Scherer, George W. (Chapter, 2016)The thermal expansion match between concrete and steel is lost when freezing occurs, owing to enhanced shrinkage caused by cryosuction in the pore solution and the high coefficient of thermal expansion (CTE) of ice. Freezing ... -
Frost dilation measurements on concrete cores from a dam with ASR
Jacobsen, Stefan; Lindgård, Jan; Fritz, Leonie (Chapter, 2008)In order to evaluate length change measurements to determine damage in concrete due to both ASR and internal frost attack, concrete cores drilled from a 25 year old dam with slight ASR and some surface frost damage were ... -
Frost durability of high-volume fly ash concrete:relation liquid transport - damage
Shpak, Andrei; Gong, Fuyuan; Jacobsen, Stefan (Peer reviewed; Journal article, 2022)Transport is central for frost deterioration, though playing different roles before/after starting freeze/thaw. Liquid uptake (LU) during rapid freeze/thaw in water (RF) and frost/salt test (FS) and relations LU-scaling ... -
Frost Salt Scaling of Concrete
Wahlbom, David; Fridh, Katja; Feng-Chong, Teddy; Dangla, Patrick; Geiker, Mette Rica; Jacobsen, Stefan; Skocek, Jan; Huy Vu, Quoc (Journal article; Peer reviewed, 2017)The project will address the mechanism(s) of deterioration in frost salt scaling (FSS) including the potentially protective effect of entrained air voids and the performance of low-clinker blends. Frost deterioration of ... -
FROST TESTING NON-AIR ENTRAINED SUPPLEMENTARY CEMENTITIOUS MATERIALS HIGH PERFORMANCE CONCRETE: SALT-SCALING AND INTERNAL DAMAGE
Jacobsen, Stefan; Asadi, Iman; Skjølsvold, Ola; Kanstad, Terje (Chapter, 2023)Air-entrainment is difficult with high volumes of Supplementary Cementitious Materials (SCM). High Performance Concrete (HPC) with low w/b without air-entrainment can, however, survive severe deicer salt frost performance ... -
Frost testing of HP/HVFA concrete for severe offshore conditions
Shpak, Andrei; Fosså, Kjell Tore; Jacobsen, Stefan (Chapter, 2019)In the Durable Advanced Concrete Solution (DACS) project lead by Kvaerner and supported by a group of Norwegian concrete industries and The Norwegian Research Council the production and documentation of frost durable ... -
Ice Abrasion and Bond Testing of Repair Mortars and High Performance Concrete
Kirkhaug, Joakim Rydningen (Master thesis, 2013)The purpose of this thesis has been to investigate ice abrasion properties for three different repair mortars, and evaluate their behavior and properties in relation to a typical B60 offshore concrete and a B70 concrete. ... -
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 ...