Browsing NTNU Open by Author "Shi, Zhenguo"
Now showing items 1-6 of 6
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The combined effect of potassium, sodium and calcium on the formation of alkali-silica reaction products
Shi, Zhenguo; Lothenbach, Barbara (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 ... -
Formation of shlykovite and ASR-P1 in concrete under accelerated alkali-silica reaction at 60 and 80 °C
Shi, Zhenguo; Park, Solmoi; Lothenbach, Barbara; Leemann, Andreas (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 ... -
Friedel's salt profiles from thermogravimetric analysis and thermodynamic modelling of Portland cement-based mortars exposed to sodium chloride solution
Shi, Zhenguo; Geiker, Mette Rica; Lothenbach, Barbara; De Weerdt, Klaartje; Garzón, Sergio Ferreiro; Enemark-Rasmussen, Kasper; Skibsted, Jørgen (Journal article; Peer reviewed, 2017)Thermogravimetric analysis (TGA), powder X-ray diffraction (XRD) and thermodynamic modelling have been used to obtain Friedel's salt profiles for saturated mortar cylinders exposed to a 2.8 M NaCl solution. Comparison of ... -
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 ... -
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 ...