Browsing NTNU Open by Author "Jacobsen, Stefan"
Now showing items 1-20 of 82
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Aerogel-Incorporated Concrete: An Experimental Study
Gao, Tao; Jelle, Bjørn Petter; Gustavsen, Arild; Jacobsen, Stefan (Journal article; Peer reviewed, 2014)Lightweight concrete can be prepared by replacing the normal aggregate of concrete, either partly or totally, with lightweight materials. In this work, by incorporating silica aerogel particles into concrete matrix, we ... -
Air entrainment in fly ash concrete: effect of sequence of AEA-SP addition
Turowski, Marcin (Master thesis, 2016)Frost resistance of concrete is directly dependent on its air content and parameters of air void system. Nowadays concrete is rarely produced without water-reducing agents, used also in air-entrained mixes. Sequence of ... -
Alkali Aggregate Reactions (AAR) in Norway: Thin section analysis and expansion measurements from a dam and a bridge
Jacobsen, Stefan; Gran, Hans Christian (Peer reviewed; Journal article, 1992)Two concrete structures with AAR have been investigated. The structures are a dam and a bridge, both approximately 30 years old. Both structures have a characteristic crack pattern on the surface of the concrete. Thin ... -
Analysing limitations of the FlowCyl as a one-point viscometer test for cement paste
Cepuritis, Rolands; Skare, Elisabeth Leite; Ramenskiy, Evgeny; Mørtsell, Ernst; Smeplass, Sverre; Li, Shizhao; Jacobsen, Stefan; Spangenberg, Jon (Journal article; Peer reviewed, 2019)The FlowCyl is a simple flow viscometer – a modification of the Marsh Cone test apparatus – developed to quantify the flow behaviour of cement pastes. The FlowCyl gives a one-parameter characterisation of rheology called ... -
Analysis of Concrete Air Voids: Comparing OpenAI-Generated Python Code with MATLAB Scripts and Enhancing 2D Image Processing Using 3D CT Scan Data
Asadi, Iman; Shpak, Andrei; Jacobsen, Stefan (Journal article; Peer reviewed, 2024)The air void system in concrete significantly affects its mechanical, thermal, and frost durability properties. This study explored the use of ChatGPT, an AI tool, to generate Python code for analyzing air void parameters ... -
Application of a New Empirical Model for Rheology Prediction of Cement Pastes Modified with Filler from Manufactured Sand
Skare, Elisabeth Leite; Cepuritis, Rolands; Mørtsell, Ernst; Smeplass, S.; Spangenberg, Jon; Jacobsen, Stefan (Journal article; Peer reviewed, 2021)There is a need for simple but precise prediction models for proportioning concrete with manufactured sand, for use in ready-mix concrete production. For the last two decades, the particle-matrix model has been used in ... -
Application of nanoindentation testing to study of the interfacial transition zone in steel fiber reinforced mortar
Wang, Xiao Hui; Jacobsen, Stefan; He, Jianying; Zhang, Zhiliang; Lee, Siaw Foon; Lein, Hilde Lea (Journal article; Peer reviewed, 2009)The characteristics of the profiles of elastic modulus and hardness of the steel fiber–matrix and fiber–matrix– aggregate interfacial zones in steel fiber reinforced mortars have been investigated by using nanoindentation ... -
Betong med høyt flygeaskeinnhold: frostbestandighet og luftporestruktur
Hustad, Jørn (Master thesis, 2019)Produksjon av sement og betong medfører store CO2-utslipp. I de fleste land i verden foregår et intensivert forsknings- og utviklingsarbeid rettet mot mer miljøvennlige løsninger. Mange av disse løsningene er i tidlige ... -
Bleeding and sedimentation of cement paste measured by hydrostatic pressure and Turbiscan
Peng, Ya; Lauten, Rolf A; Jacobsen, Stefan; Reknes, Kåre (Journal article; Peer reviewed, 2016)Sedimentation and bleeding of cement pastes with lignosulfonate were studied by visual observation, HYdroStatic Pressure Test (HYSPT) and Turbiscan measurements showing two bleeding stages: a fast initial phase followed ... -
Capillary suction model as pipes of different sizes: Flow conditions and comparison with experiments
Nguyen, Hung Thanh; Jacobsen, Stefan; Melandsø, Frank (Chapter, 2012) -
Comparison of 2-D and 3-D shape analysis of concrete aggregate fines from VSI crushing
Cepuritis, Rolands; Garboczi, Edward J.; Jacobsen, Stefan; Snyder, Kenneth A. (Journal article; Peer reviewed, 2017)The shape of concrete aggregate fine particles (fines), with particle sizes between 3 µm and 250 µm, produced by high-speed vertical shaft impact (VSI) crushing of 10 different rock types from quarries in Norway, has been ... -
Comparison of 2-D and 3-D shape analysis of concrete aggregate fines from VSI crushing
Cepuritis, Rolands; Snyder, Kenneth A.; Garboczi, Edward J.; Jacobsen, Stefan (Journal article; Peer reviewed, 2016)The shape of concrete aggregate fine particles (fines), with particle sizes between 3 µm and 250 µm, produced by high-speed vertical shaft impact (VSI) crushing of 10 different rock types from quarries in Norway, has been ... -
Concrete ice abrasion: Deterioration mechanisms, testing and modeling
Jacobsen, Stefan; Bekker, Alexander; Uvarova, Tatyana; Pomnikov, Egor; Kim, Lev; Fosså, Kjell Tore (Chapter, 2012) -
Concrete in arctic conditions WORKSHOP PROCEEDINGS FROM A NORDIC WORKSHOP Trondheim – Norway, 18–19 June 2019
Shpak, Andrei; Shamsutdinova, Guzel; Fosså, Kjell Tore; Jacobsen, Stefan (Book, 2019)PREFACE The Nordic Workshop “Concrete in arctic conditions” has been organized under the auspices of the ongoing Norwegian research project; Durable Advanced Concrete Structures (DaCS). The research project DaCS aims to ... -
Concrete-Ice Abrasion: Laboratory Studies using a Sawn Concrete Surface
Shamsutdinova, Guzel; Hendriks, Max; Jacobsen, Stefan (Journal article; Peer reviewed, 2017)Concrete-ice abrasion is a surface degradation mechanism due to ice-structure interaction especially relevant for concrete gravity-based structures in the Arctic offshore. Experiment is the main evaluation method for ... -
CONCRETE-ICE ABRASION: SURFACE ROUGHNESS AND MEASUREMENT METHOD
Shamsutdinova, Guzel; Hendriks, Max; Jacobsen, Stefan (Chapter, 2015)The wearing of concrete material due to ice movement is a cutting edge problem for offshore and coastal engineering. The phenomenon is often referred to as concrete-ice abrasion, but the physics of this process is not ... -
Concrete-ice abrasion: wear, coefficient of friction and ice consumption
Shamsutdinova, Guzel; Hendriks, Max; Jacobsen, Stefan (Journal article; Peer reviewed, 2018)Concrete structures in the Arctic offshore are often exposed to drifting ice causing abrasion of concrete surfaces. This paper presents the results of a laboratory study of concrete-ice abrasion. The sawn concrete surfaces ... -
DACS Report 06: Requirements and recommendations for frost durable concrete. Test methods. Overview of national and international standards, codes, committees, representative projects.
Shpak, Andrei; Jacobsen, Stefan (Research report, 2019)The report gives an overview of requirements and recommendations to frost durable concrete in standards and specifications, available to the author from a limited selection of standardization and engineering organizations ... -
Effect of adding sequence of air-entraining and water-reducing agents on macro-porosity and air-void stability of concrete. AVA measurements
Vimo, Ole Petter (Master thesis, 2017)Frost resistance is an important part of Concrete Technology in Northern countries, especially with increasing interest of Fly Ash as a binder product more knowledge of this topic is desired. Nowadays concrete is mixed ... -
Effect of AEA-SP dosage sequence on air content and air void structure in fresh and hardened fly ash mortar
Shpak, Andrei; Vimo, Ole Petter; Jacobsen, Stefan (Chapter; Peer reviewed, 2017)Laboratory measurements show that varying the dosage sequence of air-entraining agent and copolymer in the mix (SP added before, after or together with AEA) greatly affects air entrainment in fresh and hardened fly ash ...