The evolution of strength and crystalline phases for alkali-activated ground blast furnace slag and fly ash-based geopolymers

Journal Article · Mon Feb 15 00:00:00 EST 2010 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2009.10.010· OSTI ID:21344742

Oh, Jae Eun ^[1]; Jun, Ssang Sun ^[2]; Choi, Sejin ^[1]; Clark, Simon M ^[3]

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1. Department of Civil and Environmental Engineering, University of California, Berkeley, CA 94720 (United States)
2. Global Leading Offshore Plant Education Center, Korea Maritime University, Busan, 606-791 (Korea, Republic of)
3. Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, CA 20015 (United States)

The increase in strength and evolution of crystalline phases in inorganic polymer cement, made by the alkali activation of slag, Class C and Class F fly ashes, was followed using compressive strength test and synchrotron X-ray diffraction. In order to increase the crystallinity of the product the reactions were carried out at 80 deg. C. We found that hydrotalcite formed in both the alkali-activated slag cements and the fly ash-based geopolymers. Hydroxycancrinite, one member of the ABC-6 family of zeolites, was found only in the fly ash geopolymers. Assuming that the predominantly amorphous geopolymer formed under ambient conditions relates to the crystalline phases found when the mixture is cured at high temperature, we propose that the structure of this zeolitic precursor formed in Na-based high alkaline environment can be regarded as a disordered form of the basic building unit of the ABC-6 group of zeolites which includes poly-types such as hydroxycancrinite, hydroxysodalite and chabazite-Na.

• OSTI ID: 21344742
• Journal Information: Cement and Concrete Research, Vol. 40, Issue 2; Other Information: DOI: 10.1016/j.cemconres.2009.10.010; PII: S0008-8846(09)00293-2; Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; ISSN 0008-8846
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
BLAST FURNACES
CEMENTS
COMPRESSION STRENGTH
EVOLUTION
FLY ASH
INORGANIC POLYMERS
SLAGS
TEMPERATURE RANGE 0273-0400 K
X-RAY DIFFRACTION
ZEOLITES
AEROSOL WASTES
ASHES
BUILDING MATERIALS
COHERENT SCATTERING
COMBUSTION PRODUCTS
DIFFRACTION
FURNACES
INORGANIC ION EXCHANGERS
ION EXCHANGE MATERIALS
MATERIALS
MECHANICAL PROPERTIES
MINERALS
POLYMERS
RESIDUES
SCATTERING
SILICATE MINERALS
TEMPERATURE RANGE
WASTES