Utilization of blended fluidized bed combustion (FBC) ash and pulverized coal combustion (PCC) fly ash in geopolymer

Journal Article · Thu Apr 15 00:00:00 EDT 2010 · Waste Management

DOI:https://doi.org/10.1016/j.wasman.2009.09.040· OSTI ID:21357656

Chindaprasirt, Prinya ^[1]; Rattanasak, Ubolluk ^[2]

---

1. Department of Civil Engineering, Faculty of Engineering, Khon Kaen University, Khon Kaen 40002 (Thailand)
2. Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Burapha University, Chonburi 20131 (Thailand)

In this paper, synthesis of geopolymer from fluidized bed combustion (FBC) ash and pulverized coal combustion (PCC) fly ash was studied in order to effectively utilize both ashes. FBC-fly ash and bottom ash were inter-ground to three different finenesses. The ashes were mixed with as-received PCC-fly ash in various proportions and used as source material for synthesis of geopolymer. Sodium silicate (Na{sub 2}SiO{sub 3}) and 10 M sodium hydroxide (NaOH) solutions at mass ratio of Na{sub 2}SiO{sub 3}/NaOH of 1.5 and curing temperature of 65 deg. C for 48 h were used for making geopolymer. X-ray diffraction (XRD), scanning electron microscopy (SEM), degree of reaction, and thermal gravimetric analysis (TGA) were performed on the geopolymer pastes. Compressive strength was also tested on geopolymer mortars. The results show that high strength geopolymer mortars of 35.0-44.0 MPa can be produced using mixture of ground FBC ash and as-received PCC-fly ash. Fine FBC ash is more reactive and results in higher degree of reaction and higher strength geopolymer as compared to the use of coarser FBC ash. Grinding increases reactivity of ash by means of increasing surface area and the amount of reactive phase of the ash. In addition, the packing effect due to fine particles also contributed to increase in strength of geopolymers.

• OSTI ID: 21357656
• Journal Information: Waste Management, Vol. 30, Issue 4; Other Information: DOI: 10.1016/j.wasman.2009.09.040; PII: S0956-053X(09)00394-8; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0956-053X
• Country of Publication: United States
• Language: English

Related Subjects

12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES
COAL
COMPRESSION STRENGTH
CURING
FLUIDIZED-BED COMBUSTION
FLY ASH
GRINDING
MORTARS
PRESSURE RANGE MEGA PA
REACTIVITY
SCANNING ELECTRON MICROSCOPY
SODIUM HYDROXIDES
SODIUM SILICATES
SURFACE AREA
THERMAL GRAVIMETRIC ANALYSIS
X-RAY DIFFRACTION
AEROSOL WASTES
ALKALI METAL COMPOUNDS
ASHES
CARBONACEOUS MATERIALS
CHEMICAL ANALYSIS
CHEMICAL REACTIONS
COHERENT SCATTERING
COMBUSTION
COMBUSTION PRODUCTS
COMMINUTION
DIFFRACTION
ELECTRON MICROSCOPY
ENERGY SOURCES
FOSSIL FUELS
FUELS
GRAVIMETRIC ANALYSIS
HYDROGEN COMPOUNDS
HYDROXIDES
MACHINING
MATERIALS
MECHANICAL PROPERTIES
MICROSCOPY
OXIDATION
OXYGEN COMPOUNDS
PRESSURE RANGE
QUANTITATIVE CHEMICAL ANALYSIS
RESIDUES
SCATTERING
SILICATES
SILICON COMPOUNDS
SODIUM COMPOUNDS
SURFACE PROPERTIES
THERMAL ANALYSIS
THERMOCHEMICAL PROCESSES
WASTES