Journal
MATERIALS AND STRUCTURES
Volume 51, Issue 2, Pages -Publisher
SPRINGER
DOI: 10.1617/s11527-018-1163-6
Keywords
Alkali-activated binders; Fibre reinforced systems; Fracture and crack-growth resistance; Geopolymer; Thermal effects; Toughness
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Funding
- Natural Sciences and Engineering Research Council, (NSERC) Canada
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This paper examines the crack growth resistance of alkali-activated fly ash concrete under extreme temperatures. Plain and hybrid fibre reinforced alkali activated concrete prepared with fly ash were subjected to a range of temperatures from - 30 to 300 degrees C, sustained for 2 h. The alkali activation was effected with a blend of sodium hydroxide and sodium silicate. A fibre blend of steel to polypropylene in the volume ratio of 4:1 and a total as high as 1% by volume fraction reinforced the mixtures. The resulting systems were examined for residual strength under compression and splitting tension. Further, notched prisms were loaded under 4-point flexure to evaluate the residual fracture toughness. Based on the results, four different stages for fracture behaviour were identified with superior fibre efficiency seen at subzero temperatures. Across the breadth of temperatures examined, adding fibres led to higher residual fracture toughness for those systems that displayed a narrow range of thermal conductivity.
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