Browsing NTNU Open by Author "Lothenbach, Barbara"

Now showing items 21-30 of 30

    • Phase changes in cementitious materials exposed to saline solutions 

      Weerdt, Klaartje de; Bernard, Ellina; Kunther, Wolfgang; Pedersen, Malene Thostrup; Lothenbach, Barbara (Peer reviewed; Journal article, 2023)
      This article summarizes long-term degradation mechanisms of cementitious materials in contact with fresh and saline solutions based on a review of experimental observations in field and laboratory studies. In addition, a ...

    • Predicting damage in aggregates due to the volume increase of the alkali-silica reaction products 

      Gallyamov, E.R.; Leemann, A.; Lothenbach, Barbara; Molinari, J.-F. (Peer reviewed; Journal article, 2022)
      Volume increase between the reactants and the products of alkali-silica reaction could reach up to 100%. Taking place inside the aggregates, ASR imposes internal pressure on the surrounding material. In the current paper, ...

    • Role of calcium on chloride binding in hydrated Portland cement–metakaolin–limestone blends 

      Shi, Zhenguo; Geiker, Mette Rica; De Weerdt, Klaartje; Østnor, Tone Anita; Lothenbach, Barbara; Winnefeld, Frank; Skibsted, Jørgen (Journal article; Peer reviewed, 2017)
      Chloride binding is investigated for Portland cement–metakaolin–limestone pastes exposed to CaCl2 and NaCl solutions. The phase assemblages and the amount of Friedel's salt are evaluated using TGA, XRD and thermodynamic ...

    • Solubility and characterization of synthesized 11 Å Al-tobermorite 

      Lothenbach, Barbara; Jansen, Daniel; Yan, Yiru; Schreiner, J. (Peer reviewed; Journal article, 2022)
      The structure and solubility of hydrothermally prepared 11 Å Al-tobermorite with Al/(Al + Si) = 0.1 has been studied. NMR and FTIR data indicated the formation of a cross-linked, well crystalline 11 Å Al-tobermorite and ...

    • Sulfate resistance of calcined clay – Limestone – Portland cements 

      Shi, Zhenguo; Ferreiro, Sergio; Lothenbach, Barbara; Geiker, Mette Rica; Kunther, Wolfgang; Kaufmann, Josef; Herforth, Duncan; Skibsted, Jørgen (Journal article; Peer reviewed, 2019)
      Calcined clays emerge as a promising source of supplementary cementitious material, which can provide a significant lowering of the Portland clinker content in blended cements. This study focusses on sulfate resistance of ...

    • Synthesis of alkali-silica reaction product structurally identical to that formed in field concrete 

      Shi, Zhenguo; Leemann, Andreas; Rentsch, Daniel; Lothenbach, Barbara (Peer reviewed; Journal article, 2020)
      Alkali-silica reaction (ASR) can cause expansion and cracking of concrete. Despite significant progress over the past 80 years, the molecular structures of the ASR products remain poorly understood. These reaction products ...

    • Synthesis, characterization, and thermodynamic study of selected K-based zeolites 

      Ma, Bin; Lothenbach, Barbara (Peer reviewed; Journal article, 2021)
      Potassium-rich zeolites often occur in cementitious systems, as K+ is widespread in various cementitious materials, such as Portland, blended and alkali-activated cements. The knowledge of their stability and of thermodynamic ...

    • Synthesis, characterization, and thermodynamic study of selected Na-based zeolites 

      Ma, Bin; Lothenbach, Barbara (Peer reviewed; Journal article, 2020)
      Zeolites are crystalline aluminosilicates with three-dimensional framework structures that can form in alkali-activated cements, Roman cements, and the interaction zone of cements and clays. However, their stability domains ...

    • Thermodynamic Modeling and Experimental Study of Carbonation of Alkali-Activated Slag Cements 

      Park, Solmoi; Lothenbach, Barbara; Jang, Jeong Gook; Kim, Hyeong-Ki; Lee, Namkon (Peer reviewed; Journal article, 2022)
      The present study investigates the carbonation of slags activated by NaOH, Na2SiO3, Na2CO3, and Na2SO4. The main hydrates in those activated with NaOH or Na2SiO3 were C-(N-)A-S-H, strätlingite, and MgAl-layered double ...

    • Thermodynamic study of cement/rock interactions using experimentally generated solubility data of zeolites 

      Ma, Bin; Lothenbach, Barbara (Peer reviewed; Journal article, 2020)
      Alteration of widespread interfaces between cements and clays in geological time scales is essential to the safety assessment of radioactive waste repositories but not well understood partly due to the low reliability of ...