Preparation and mechanical properties of polypropylene fiber reinforced calcined kaolin-fly ash based geopolymer |
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Authors: | Zu-hua Zhang Xiao Yao Hua-jun Zhu Su-dong Hua and Yue Chen |
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Affiliation: | (1) College of Materials Science and Engineering, Nanjing University of Technology, Nanjing, 210009, China;(2) State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing, 210009, China |
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Abstract: | To improve the environmental benefits and solve the problems of large shrinkage and high brittleness, the partial replacement
of calcined kaolin by fly ash as a raw material for geopolymer synthesis and the influences of polypropylene (PP) fiber on
the mechanical properties and volume stability were investigated. The results show that compressive strength of the geopolymer
containing 33.3%(mass fraction) fly ash by steam curing at 80 °C for 6 d is improved by 35.5%. The 3-day compressive strength,
flexural strength and impacting energy of geopolymers containing 0.05%PP fiber increase by 67.8%, 36.1% and 6.25%, while the
shrinkage and modulus of compressibility decrease by 38.6% and 31.3%, respectively. The results of scanning electron microscopy
(SEM) and the appearances of crack growths confirm that PP fiber can offer a bridging effect over the harmful pores and defects
and change the expanding ways of cracks, resulting in a great improvement of strength and toughness.
Foundation item: Project(2006AA06Z225) supported by the National High-Tech Research and Development Program of China |
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Keywords: | polypropylene fiber calcined kaolin fly ash geopolymer preparation mechanical properties |
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