期刊
CEMENT AND CONCRETE RESEARCH
卷 42, 期 9, 页码 1242-1251出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.cemconres.2012.05.019
关键词
Alkaline solution/binder ratio; Alkali-activated cement (D); Fly ash (D); Metakaolin (D)
资金
- Spanish Ministry of Science and Innovation project [BIA2010-17530]
- Spanish Research Council (CSIC) Post-Graduate Studies Council (JAE) grant
- Danish Natural Science Research Council
- Danish Technical Science Research Council
- Carlsbergfondet
- Danish Council for Independent Research
- Natural Sciences (FNU)
- Direktor lb Henriksens Fond
This study investigates the effect of the alkaline solution/binder (S/B) ratio on the composition and nano-structure of the reaction products generated in the alkaline activation of aluminosilicates. The experiments used two mixtures of fly ash and dehydroxylated white clay and for each of these, varying proportions of the solution components. The alkali activator was an 8 M NaOH solution (with and without sodium silicate) used at three S/B ratios: 0.50, 0.75 and 1.25. The Si-29, Al-27 MAS NMR and XRD characterisation of the reaction products reveal that for ratios nearest the value delivering suitable paste workability, the reaction-product composition and structure depend primarily on the nature and composition of the starting materials and the alkaline activator used. However, when an excess alkaline activator is present in the system, the reaction products tend to exhibit SiO2/Al2O3 ratios of approximately 1, irrespective of the composition of the starting binder or the alkaline activator. (C) 2012 Elsevier Ltd. All rights reserved.
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