Effect of Ultrafine Additives on the Morphology of Cement Hydration Products

The present research is focused on the investigation of the influence of ultrafine additives on the structure formation of hardened cement paste and the establishment of the mechanisms of the morphological transformations, which determine the properties of hydrated products. In the course of the res...

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Bibliographic Details
Published in:Crystals (Basel) 2021-08, Vol.11 (8), p.1002
Main Authors: Yakovlev, Grigory, Drochytka, Rostislav, Skripkiūnas, Gintautas, Urkhanova, Larisa, Polyanskikh, Irina, Pudov, Igor, Karpova, Ekaterina, Saidova, Zarina, Elrefai, Ali E. M. M.
Format: Article
Language:English
Subjects:
Additives
Adhesive strength
Carbon black
carbon nanotubes
cement
Cement hydration
cement hydration products
Cement paste
Chemical vapor deposition
Concrete
Fourier transforms
Graphene
Homogenization
Hydration
Industrial wastes
Infrared analysis
Mechanical properties
Morphology
Multi wall carbon nanotubes
Particle size
Portland cements
Silica
Silica fume
Silicon dioxide
Thermal analysis
ultrafine additives
Ultrafines
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Summary:The present research is focused on the investigation of the influence of ultrafine additives on the structure formation of hardened cement paste and the establishment of the mechanisms of the morphological transformations, which determine the properties of hydrated products. In the course of the research, the modification of ordinary Portland cement was performed by the suspension of multi-walled carbon nanotubes (MWCNTs), carbon black (CB) paste, and silica fume (SF). Scanning electron microscopy (SEM), energy-dispersive X-ray (EDX) microanalysis, X-ray diffraction (XRD) analysis, thermal analysis, and Fourier-transform infrared (FTIR) spectroscopy were used to study cement hydration products. The morphology of hardened cement paste depends on the chemical reactivity of additives, their geometry, and their genesis. The action mechanism of the inert carbon-based additives and pozzolanic silica fume were considered. The cement hydration products formed in the process of modification by both types of ultrafine additives are described. In the case of the modification of cement paste by inert MWCNTs and CB paste, the formation of cement hydration products on their surface without strong adhesion was observed, whereas in the case of the addition of SF separately and together with MWCNTs, the strong adhesion of additives and cement hydration products was noted.
ISSN:2073-4352
2073-4352
DOI:10.3390/cryst11081002