Application of Isothermal and Isoperibolic Calorimetry to Assess the Effect of Zinc on Hydration of Cement Blended with Slag

Materials

Přemysl Pokorný¹  Pavel Šiler²  Jiří Másilko²  Lukáš Matějka²  Michal Marko²  Iva Kolářová²  Tomáš Opravil²  Radoslav Novotný²  Martin Janča²  Jan Hajzler²  Jan Bednárek²  František Šoukal²  Jan Koplík² 

[1] Institute of Automotive Engineering, Faculty of Mechanical Engineering, Brno University of Technology, Technická 2896/2, CZ-61669 Brno, Czech Republic;Materials Research Centre, Faculty of Chemistry, Brno University of Technology, Purkyňova 118, CZ-61200 Brno, Czech Republic;

关键词: Portland cement;    zinc;    isothermal calorimetry;    isoperibolic calorimetry;    ground blast furnace slag;   

DOI  :  10.3390/ma12182930

来源: DOAJ

【 摘 要 】

This work deals with the influence of zinc on cement hydration. The amount of zinc in cement has increased over recent years. This is mainly due to the utilization of solid waste and tires, which are widely used as a fuel in a rotary kiln. Zinc can also be introduced to cement through such secondary raw materials as slag, due to increased recycling of galvanized materials. The aim of this work was to determine the effect of zinc on the hydration of Portland cement, blended with ground blast furnace slag (GBFS). This effect was studied by isothermal and isoperibolic calorimetry. Both calorimetry methods are suitable for measurements during the first days of hydration. Isoperibolic calorimetry monitors the hydration process in real-life conditions, while isothermal calorimetry does so at a defined chosen temperature. Zinc was added to the cement in the form of two soluble salts, namely Zn(NO₃)₂, ZnCl₂, and a poorly soluble compound, ZnO. The concentration of added zinc was chosen to be 0.05, 0.1, 0.5, and 1mass percent. The amount of GBFS replacement was 15% of cement dosage. The newly formed hydration products were identified by X-ray diffraction method (XRD).

【 授权许可】

Unknown