Blar i NTNU Open på forfatter "Hemstad, Petter"
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Alkali metal distribution in composite cement pastes and its relation to accelerated ASR tests
Hemstad, Petter; Zuschlag, Pamela; Kjellemyr, Petter; Lindgård, Jan; Kjellsen, Knut O.; Rønning, Terje; Justnes, Harald; Maciej, Zajac; Haha, Mohsen Ben; Weerdt, Klaartje de (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 ... -
Cement paste chemistry and its relation to concrete durability
Hemstad, Petter (Doctoral theses at NTNU;2023:258, Doctoral thesis, 2023) -
Chloride binding in Portland composite cements containing metakaolin and silica fume
Babaahmadi, Arezou; Machner, Alisa; Kunther, Wolfgang; Figueira, João; Hemstad, Petter; De Weerdt, Klaartje (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 ... -
Fundamental study on ASR kinetics - effect of temperature on aggregate reactivity and pore-water composition
De Weerdt, Klaartje; Hemstad, Petter; Justnes, Harald; Østnor, Tone Anita; Rønning, Terje F.; Lindgård, Jan (The International Conference on Alkali-Aggregate Reaction (ICAAR);Theme 4, Chapter, 2021) -
pH-dependence of chloride binding in ordinary Portland cement
Hemstad, Petter (Master thesis, 2018)A new method for artificially leaching hydrated cement paste and studying how lowered pH in the pore solution affects chloride binding has been developed. Hydrated cement paste was exposed to a NaCl-solution before being ... -
Studying the C-A-S-H composition using advanced data treatment of SEM-EDS hypermaps
Kjellemyr, Petter. (Master thesis, 2023)Kalsium alumina silikat hydrat (C-A-S-H) regnes som hovedproduktet som dannes ved hydratasjon av Portland og Portland kompositt sement og er derfor elementær for styrke og bæreevne for sement. En konvensjonell metode brukt ... -
The effect of artificial leaching with HCl on chloride binding in ordinary Portland cement paste
Hemstad, Petter; Machner, Alisa; De Weerdt, Klaartje (Journal article; Peer reviewed, 2020)This study investigates how the pH in the pore solution influences the chloride binding in Portland cement pastes. Cement paste samples were exposed to NaCl, CaCl2 and HCl solutions. The mechanisms of changes in chloride ... -
Towards the Understanding of the pH Dependency of the Chloride Binding of Portland Cement Pastes
Machner, Alisa; Hemstad, Petter; De Weerdt, Klaartje (Journal article; Peer reviewed, 2018)Hydrated Portland cement paste exposed to a NaCl solution was acidified by adding HCl in small steps, gradually lowering the pH. The chloride binding of the cement paste changed as a function of the pH. For the range of ...