Pozzolanic behaviour of compound-activated red mud-coal gangue mixture

Journal Article · Tue Mar 15 04:00:00 EDT 2011 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2010.11.013· OSTI ID:21494105

Xiaoming, Liu ^[1]; Henghu, Sun ^[2]; Longtu, Li ^[3]

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1. School of Metallurgical and Ecological Engineering, University of Science and Technology Beijing, Beijing 100083 (China)
2. School of Engineering and Computer Science, University of the Pacific, Stockton, CA 95211 (United States)
3. State Key Lab of New Ceramics and Fine Processing, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 (China)

The pozzolanic behaviour of compound-activated red mud-coal gangue has been investigated through TG, DTA, XRD, FTIR and {sup 27}Al MAS NMR. From viewpoint of reaction kinetics, it is found that the pozzolanic reaction mechanism of the compound-activated red mud-coal gangue - lime system is clearly consistent with diffusion control up to 14 days, and the reaction rate constant calculated from Jander equation decreases with the increase of CaO addition in the system. The hydration products formed in the red mud-coal gangue - lime systems at ambient temperature are essentially aluminous C-S-H and Ca{sub 3}Al{sub 2}O{sub 6}.xH{sub 2}O. From TG analysis results, it is thought that the high amount of Ca(OH){sub 2} in the pastes of studied system is not conducive to the continual increase of non-evaporable water content of the hydration products. Of particular interest, {sup 27}Al MAS NMR proved to be an effective technique to obtain valuable information of Al{sup [4]} in C-S-H and Al{sup [6]} in Ca{sub 3}Al{sub 2}O{sub 6}.xH{sub 2}O.

• OSTI ID: 21494105
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 3 Vol. 41; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ALKALINE EARTH METAL COMPOUNDS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AMBIENT TEMPERATURE
CALCIUM COMPOUNDS
CALCIUM HYDROXIDES
CALCIUM OXIDES
CARBONACEOUS MATERIALS
CHALCOGENIDES
CHEMICAL ANALYSIS
COAL
COHERENT SCATTERING
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
DISPERSIONS
ENERGY SOURCES
EQUATIONS
FOSSIL FUELS
FOURIER TRANSFORMATION
FUELS
GANGUE
GRAVIMETRIC ANALYSIS
HYDRATION
HYDROGEN COMPOUNDS
HYDROXIDES
INFRARED SPECTRA
INTEGRAL TRANSFORMATIONS
KINETICS
MAGNETIC RESONANCE
MATERIALS
MIXTURES
NUCLEAR MAGNETIC RESONANCE
OXIDES
OXYGEN COMPOUNDS
QUANTITATIVE CHEMICAL ANALYSIS
REACTION KINETICS
RESIDUES
RESONANCE
SCATTERING
SOLVATION
SPECTRA
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
TRANSFORMATIONS
X-RAY DIFFRACTION