期刊
CEMENT & CONCRETE COMPOSITES
卷 92, 期 -, 页码 165-177出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.cemconcomp.2018.06.010
关键词
Alkali activated cement; Fly ash; Durability; Microstructure; Mechanical properties
资金
- Halok Geopolymer research project
- Australian Research Council projects [LP130101016, DE170101070]
- Fundamental Science on Nuclear Wastes and Environmental Safety Laboratory project [14zxnk01]
- National Natural Science Foundation of China [11405140]
This paper reports the effects of efflorescence on the microstructural and mechanical properties of fly ash-based geopolymers. Geopolymer pastes manufactured by sodium hydroxide and sodium silicate activation of three Class F fly ashes exhibit varying efflorescence behaviour. The geopolymer derived from sodium silicate activation of fine fly ash, which has a compact microstructure, shows a relatively slow efflorescence rate and low efflorescence potential. The efflorescence occurring on the surface of the geopolymer specimens does not change their mineralogical characteristics. However, the compressive strength development and compressive modulus of geopolymers can be affected through processes related to the loss of alkalis, and also to subflorescence. The phenomenon of subflorescence can be regarded as an extended efflorescence taking place under the surface of the material, leading to crystallisation pressure, which may exceed the tensile strength of hardened binders and generate structural damage.
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