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The influence of sapphire substrate silicon carbide sludge on structural properties of metakaolin‐based geopolymers
Author(s) -
Lo KangWei,
Lin KaeLong,
Cheng TaWui,
Zhang BoXuan
Publication year - 2019
Publication title -
environmental progress and sustainable energy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.495
H-Index - 66
eISSN - 1944-7450
pISSN - 1944-7442
DOI - 10.1002/ep.13305
Subject(s) - metakaolin , materials science , geopolymer , silicon , silicon carbide , microstructure , composite material , chemical engineering , compressive strength , metallurgy , engineering
This study investigated a geopolymerization system focused on the effects of the solid‐to‐liquid ratio (S/L) were ranging from 0.4 to 1.0, which produces geopolymers with various silicon carbide sludge (SCS) replacement levels (0–40 wt. %). The results indicated that the silicon carbide sludge metakaolin‐based (SCSMB) geopolymers increased S/L ratios from 0.8 to 1.0, reducing initial and final setting times. Flexural strength of SCSMB geopolymers of the SL ratio of 0.4 increased rapidly from 1.31 to 1.70 MPa during the early stage of curing (1–14 days). For SCSMB geopolymers with 10–40% SCS replacement, peak of SiOSi bonds for geopolymers at 524 cm −1 shifted to a higher wavenumber of 527 cm −1 . 29 Si nuclear magnetic resonance (NMR) showed that SCSMB geopolymer with an SCS replacement ratio of 10% increased S/L ratios from 0.8 to 1.0 (56 days) and increased the fractions of Q 4 (3Al; 38.2%–38.4%), Q 4 (2Al; 28.7%–31.7%), and Q 4 (1Al; 13.7%–14.6%). Moreover, the peak in 29 Si NMR spectra shifted to the right side (higher frequency), indicating that an increased number of aluminum tetrahedrons coordinated with silicon tetrahedrons. SCSMB geopolymers with 10% SCS replacement and an S/L ratio of 1.0 yielded highly favorable mechanical characteristics and microstructure.