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Properties and microstructure of eco‐cement produced from co‐sintered washed fly ash and waste sludge
Author(s) -
Lin KaeLong,
Lo KangWei,
Shie JeLueng,
Le Anh Tuan Bui,
Hwang ChaoLung,
Chang YuMin
Publication year - 2016
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.12310
Subject(s) - fly ash , cement , portland cement , clinker (cement) , compressive strength , curing (chemistry) , materials science , raw material , waste management , microstructure , metallurgy , pulp and paper industry , composite material , chemistry , organic chemistry , engineering
This study investigated the possibility of recycling washed fly ash, limestone sludge, stone sludge, and iron‐oxide sludge in raw meal for producing Portland cement clinker. All of the major phase components of ordinary Portland cement (OPC)—C 3 S, C 2 S, C 3 A, and C 4 AF—were identified in each eco‐cement clinker. The compressive strength development showed that the eco‐cement pastes no contained washed fly ash was similar to commercial OPC products. The exothermic peak at 105°C to 440°C corresponded to the coordination change of C‐S‐H gel in the pastes during curing time. The TG/DTA curves showed that the weight loss of the eco‐cement pastes no contained washed fly ash was higher than that of the eco‐cement pastes contained 1% washed fly ash. The Q 0 (−70 ppm) species shifted to the Q 1 (−80 ppm) and Q 2 (−87 ppm) species during curing time. The degrees of hydration of the eco‐cement pastes contained 2 to 4% washed fly ash were lower than that of the eco‐cement pastes no contained washed fly ash. The results of the physicomechanical tests showed that adding the limestone sludge, stone sludge, and iron‐oxide sludge did not negatively affect the quality of the produced cement. © 2016 American Institute of Chemical Engineers Environ Prog, 35: 764–771, 2016