Browsing Fakultet for ingeniørvitenskap (IV) by Journals "Cement and Concrete Research"
Now showing items 1-20 of 45
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Al uptake in calcium silicate hydrate and the effect of alkali hydroxide
(Peer reviewed; Journal article, 2022)The effect of Al and of pH on the structure of calcium silicate hydrate (C-S-H), the most important hydration product in Portland and blended cement, was studied at Ca/Si ~1.0. The presence of Al led to higher amounts of ... -
Alkali metal distribution in composite cement pastes and its relation to accelerated ASR tests
(Peer reviewed; Journal article, 2023)Accelerated testing of alkali silica reaction (ASR) in concrete at elevated temperatures of 38 and 60 °C has an unknown impact on the alkali metal distribution in the cement paste. This paper investigates how the alkali ... -
Alkali-silica reaction (ASR)-performance testing: Influence of specimen pre-treatment, exposure conditions and prism size on alkali leaching and prism expansion
(Journal article; Peer reviewed, 2013)Whether or not concrete prism tests developed for assessment of alkali–silica reactivity of aggregates might be suitable for general ASR performance testing of concrete has been evaluated. This paper discusses how variations ... -
Alkali–silica reaction (ASR)—performance testing: Influence of specimen pre-treatment, exposure conditions and prism size on concrete porosity, moisture state and transport properties
(Journal article; Peer reviewed, 2013)Whether or not concrete prism tests (CPTs) developed for assessment of alkali–silica reactivity of aggregates might be suitable for general ASR performance testing of concrete has been evaluated. This paper presents the ... -
Analysis of the trend of pH changes of concrete pore solution during the hydration by various analytical methods
(Peer reviewed; Journal article, 2022)The pH is an important parameter in concrete health monitoring. Many studies have been conducted to investigate the environmental elements that influence the pH value of concrete. This study focussed on the investigation ... -
Application of nanoindentation testing to study of the interfacial transition zone in steel fiber reinforced mortar
(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 ... -
Chloride binding in Portland composite cements containing metakaolin and silica fume
(Peer reviewed; Journal article, 2022)This paper investigates how the composition of Portland composite cements affects their chloride-binding properties. Hydrated cement pastes prepared with a reference Portland cement and composite Portland cements containing ... -
Chloride-binding capacity of hydrotalcite in cement pastes containing dolomite and metakaolin
(Journal article; Peer reviewed, 2018)In this study, we investigated well-hydrated cement pastes containing dolomite and metakaolin cured at 38 °C or 60 °C, which were exposed to NaCl or CaCl2 solutions of various concentrations. We determined the chloride-binding ... -
The combined effect of potassium, sodium and calcium on the formation of alkali-silica reaction products
(Peer reviewed; Journal article, 2020)Both alkalis and calcium play essential roles in the formation of alkali-silica reaction (ASR) products. Investigation of their combined effect helps to better understand the conditions of ASR. In this study, samples with ... -
Comparing chloride ingress from seawater and NaCl solution in Portland cement mortar
(Journal article; Peer reviewed, 2019)This study investigates whether chloride ingress testing can be done using NaCl solution instead of seawater when assessing the performance of concrete in marine conditions. Seawater contains besides sodium and chlorine ... -
Concluding destructive investigation of a nine-year-old marine-exposed cracked concrete panel
(Peer reviewed; Journal article, 2023)This study undertaken on a nine-year-old cracked concrete panel further investigates the impact of cracks on the corrosion performance of conventional steel reinforcement in marine-exposed concrete to explain observed ... -
Determination of the pH and the free alkali metal content in the pore solution of concrete: Review and experimental comparison
(Journal article; Peer reviewed, 2017)The durability of concrete is affected by the pH of its pore solution, which is linked to the free alkali metal content. This paper starts with a literature review of methods for determining the pH and/or the free alkali ... -
Determining the free alkali metal content in concrete – Case study of an ASR-affected dam
(Journal article; Peer reviewed, 2018)In concrete affected by alkali–silica reaction (ASR), aggregates react in the high pH environment and cause deleterious expansion and cracking of the concrete. Leaching of alkali metals from the concrete might therefore ... -
Durability of cracked SFRC exposed to wet-dry cycles of chlorides and carbon dioxide – Multiscale deterioration phenomena
(Peer reviewed; Journal article, 2020)This paper describes an experimental study that comprised the exposure of cracked SFRC members to wet-dry cycles involving chloride and carbon-dioxide for two years. Results indicate that corrosion of steel fibres occurs ... -
Effect of alkali hydroxide on calcium silicate hydrate (C-S-H)
(Peer reviewed; Journal article, 2022)This paper investigates the effect of KOH and NaOH on C-S-H structure and solubility. Both KOH and NaOH have a similar effect, they increase pH values and silicon concentrations, and decrease calcium concentrations. At ... -
The effect of equilibration time on Al uptake in C-S-H
(Peer reviewed; Journal article, 2021)Calcium silicate hydrate (C-S-H) is the main hydration product of Portland cements. The partial replacement of Portland cements by supplementary cementitious materials can result in C-S-H with lower Ca/Si ratios and more ... -
Effect of leaching on the composition of hydration phases during chloride exposure of mortar
(Peer reviewed; Journal article, 2022)Mortar specimens were exposed to either a 3% NaCl solution or a 3% NaCl+KOH solution for up to 180 days. Exposure to the NaCl solution provoked much more leaching than the NaCl+KOH exposure. Leaching strongly impacted the ... -
Effect of temperature curing on properties and hydration of wollastonite blended magnesium potassium phosphate cements
(Peer reviewed; Journal article, 2021)K-struvite, the main hydrate of magnesium potassium phosphate (MKP) cements, dehydrates at ~50 °C, thus elevated temperatures at service conditions could affect cement properties and durability. In this study, properties ... -
Formation of shlykovite and ASR-P1 in concrete under accelerated alkali-silica reaction at 60 and 80 °C
(Peer reviewed; Journal article, 2020)Three types of alkali-silica reaction (ASR) products, i.e., crystalline K-shlykovite, Na-shlykovite and nano-crystalline ASR-P1, have recently been synthesized at 80 °C. It is critical to verify the formation of these ASR ... -
Frost durability of high-volume fly ash concrete:relation liquid transport - damage
(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 ...