A kind of sheet-like carbon fiber preform was developed using short fibers (2, 7 and 12mm, respectively)
as starting materials and used to strengthen a geopolymer. Mechanical properties, fracture behavior,
microstructure and toughening mechanisms of the as-prepared composites were investigated by threepoint
bending test, optical microscope and scanning electron microscopy. The results show that the short
carbon fibers disperse uniformly in geopolymer matrix. The Cf/geopolymer composites exhibit apparently
improved mechanical properties and an obvious noncatastrophic failure behavior. The composite reinforced
by the carbon fibers of 7mm in length shows a maximum flexural strength as well as the highest
work of facture, which are nearly 5 times and more than 2 orders higher than that of the geopolymer
matrix, respectively. The predominant strengthening and toughening mechanisms are attributed to the
apparent fiber bridging and pulling-out effect based on the weak fiber/matrix interface as well as the
sheet-like carbon fiber preform.
A kind of sheet-like carbon fiber preform was developed using short fibers (2, 7 and 12mm, respectively)as starting materials and used to strengthen a geopolymer. Mechanical properties, fracture behavior,microstructure and toughening mechanisms of the as-prepared composites were investigated by threepointbending test, optical microscope and scanning electron microscopy. The results show that the shortcarbon fibers disperse uniformly in geopolymer matrix. The Cf/geopolymer composites exhibit apparentlyimproved mechanical properties and an obvious noncatastrophic failure behavior. The composite reinforcedby the carbon fibers of 7mm in length shows a maximum flexural strength as well as the highestwork of facture, which are nearly 5 times and more than 2 orders higher than that of the geopolymermatrix, respectively. The predominant strengthening and toughening mechanisms are attributed to theapparent fiber bridging and pulling-out effect based on the weak fiber/matrix interface as well as thesheet-like carbon fiber preform.
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