期刊
CEMENT AND CONCRETE RESEARCH
卷 42, 期 6, 页码 855-864出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2012.03.004
关键词
Alkali activated cement; Microstructure; X-ray microtomography; Transport properties
资金
- Australian Research Council (ARC)
- Particulate Fluids Processing Centre, a Special Research Centre of the ARC
- Zeobond Research
- Banksia Environmental Foundation
- U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences [DE-AC02-06CH11357]
Durability of alkali-activated binders is of vital importance in their commercial application, and depends strongly on microstructure and pore network characteristics. X-ray microtomography (mu CT) offers, for the first time, direct insight into microstructural and pore structure characteristics in three dimensions. Here, mu CT is performed on a set of sodium metasilicate-activated fly ash/slag blends, using a synchrotron beamline instrument. Segmentation of the samples into pore and solid regions is then conducted, and pore tortuosity is calculated by a random walker method. Segmented porosity and diffusion tortuosity are correlated, and vary as a function of slag content (slag addition reduces porosity and increases tortuosity), and sample age (extended curing gives lower porosity and higher tortuosity). This is particularly notable for samples with >= 50% slag content, where a space-filling calcium (alumino)silicate hydrate gel provides porosity reductions which are not observed for the sodium aluminosilicate ('geopolymer') gels which do not chemically bind water of hydration. (C) 2012 Elsevier Ltd. All rights reserved.
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