Browsing Institutt for konstruksjonsteknikk by Journals "Nordic Concrete Research"
Now showing items 1-20 of 31
-
Application of a New Empirical Model for Rheology Prediction of Cement Pastes Modified with Filler from Manufactured Sand
(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 ... -
Behaviour and Capacity of Lightweight Aggregate Concrete Beams with and without Shear Reinforcement
(Journal article; Peer reviewed, 2017)The main disadvantages of lightweight aggregate compared with normal weight concrete are its brittleness at the material level in compression and uncontrolled crack propagation. This experimental investigation consists of ... -
Clays as SCM – Reactivity of Uncalcined Kaolinite and Bentonite, and Impact on Phase Assemblage and Strength Development of PC Mortars
(Journal article; Peer reviewed, 2019)The impact of substitution of cement paste with uncalcined clay (bentonite and kaolinite) in the range of 5% by volume of paste on the development of hydration and properties of mortar was investigated. Two issues were ... -
Concrete-Ice Abrasion: Laboratory Studies using a Sawn Concrete Surface
(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 ... -
Durability testing of low clinker blends - chloride ingress in similar strength mortar exposed to seawater
(Chapter; Peer reviewed, 2017)Resistance to chloride ingress of ten different binders was investigated. Most of the binders were prepared with 35% substitution of a new clinker by limestone filler, calcined clay, burnt shale and/or siliceous fly ash. ... -
Effect of AEA-SP Dosage Sequence on Air Entrainment in FA Concrete
(Journal article; Peer reviewed, 2019)Laboratory measurements show that varying the dosage sequence of air-entraining agent and co-polymer in the mix (SP added before, after or together with AEA) greatly affects air entrainment in fresh and hardened fly ash ... -
Effect of Set Accelerator on Capillary Suction and Porosity of Concrete – Cast Samples with Constant Water/Binder Ratio
(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
(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 ... -
Empirical Modelling of Lithium Mitigation for Alkali-Silica Reactivity
(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 ... -
Excavated rock materials from tunnels for sprayed concrete
(Chapter; Peer reviewed, 2017)Sand extracted from natural resources is widely used in concrete production nowadays. The increase in demand for concrete production has resulted in shortage of natural sand resources, especially in terms of suitable ... -
Failure of Lightweight Aggregate Concrete in Compression under Stress Gradients
(Journal article; Peer reviewed, 2019)The objective of this experiment is to investigate the behaviour of lightweight aggregate concrete (LWAC) under compression and with stress gradients. Experimental program contained three sets of LWAC which were used for ... -
Filler and Water Reducer Effects on Sedimentation, Bleeding and Zeta-Potential of Cement Paste
(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 ... -
Frost Salt Scaling of Concrete
(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-salt Testing Non-air Entrained High-performance Fly-ash Concrete Part II: Parameter Study of Effect of Internal Cracking on Glue Spall Stress
(Journal article; Peer reviewed, 2024)A parametric analysis of glue spall stress (concrete surface tensile stress at ice-discontinuities by differential thermal expansion ice-concrete) as affected by internal cracking in concrete in the CEN/TS 12390-9 salt-frost ... -
Frost-salt Testing Non-air Entrained High-Performance Fly-ash Concrete. Part I: Relations Liquid uptake - Internal Cracking – Scaling
(Peer reviewed; Journal article, 2024)The surface scaling of low CO2-emission High Performance Concretes (HPC) was studied in freeze/thaw performance tests with a 3 mm layer of 3% NaCl on the surface to investigate whether such concretes can be made frost ... -
Impact of Accelerated Carbonation on Microstructure and Phase Assemblage
(Journal article; Peer reviewed, 2018)The paper summarizes preliminary results on characterization of the microstructure and phase assemblage of mortar and concrete samples containing Portland and Portland -fly ash cement carbonated at ... -
Investigation of the products of the dolomite reaction in Portland cement pastes
(Chapter; Peer reviewed, 2017)The formation of potentially deleterious reaction products from the reaction of dolomite fines in Portland cement pastes was investigated. It was shown that the reaction of dolomite fines did not follow the commonly accepted ... -
Long-term Influence of Concrete Surface and Crack Orientation on Self-healing and Ingress in Cracks – Field Observations
(Journal article; Peer reviewed, 2018)This paper presents results from investigations on the long-term influence of concrete surface and crack orientation on ingress in cracks. Five reinforced concrete structures from Norway exposed to either de-icing salts ... -
Non-destructive Test Methods for Corrosion Detection in Reinforced Concrete Structures
(Peer reviewed; Journal article, 2020)Several inspection methods can be used to assess the corrosion state of steel reinforcement in concrete. Especially for periodical field surveys and monitoring, non-destructive testing (NDT) methods are to be preferred as ... -
Nordic Concrete Research workshop: “Accelerated freeze-thaw testing of concrete”, Lyngby, 20th April 2022
(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 ...