Journal
CONSTRUCTION AND BUILDING MATERIALS
Volume 361, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.conbuildmat.2022.129637
Keywords
Blast furnace slag; Geopolymer; Mechanosynthesis; High energy ball milling; Flexural strength; Compressive strength
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This study focuses on the production of a pre-geopolymer powder precursor using a mechanosynthesis process. The results show that the geopolymer binder exhibits a high compressive strength and has an amorphous structure with the formation of specific structures. These findings are significant for the application and development of geopolymer materials.
This work consists of producing a pre-geopolymer powder (PGP) precursor by mechanosynthesis process. Blast furnace slag (BFS) was chosen as an aluminosilicate source and was dry-mixed with sodium silicate and sodium hydroxide microbeads, with different Na2SiO3/NaOH ratios. The mix was subjected to high ball milling, with different milling times and speeds.Several characterization techniques were conducted, including particle size distribution analysis, X-ray diffraction (XRD), scanning electron microscopy (SEM), and mechanical tests. In situ attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) was used to track the kinetics of the geopolymerization reaction. The results underlined that the elaborated geopolymer pastes structures are mainly amorphous, with the appearance of new structures such as calcium silicate hydrate (C-S-H), which is formed in parallel with the products of the geopolymerization reaction (N-A-S-H network). The compressive strength reached 42 MPa after 7 curing days.
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