Comparative Deflection Hardening Behavior of Fiber Reinforced Fly Ash Based Geopolymer Composites
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This study evaluates the behavior of a recently developed ductile fiber reinforced geopolymer composite(DFRGC) exhibiting deflection hardening and multiple cracking behavior in flexure employing four different activator combinations including two Na-based and one K-based activator solutions, and oneCa-based activator combination in the form of powder. Randomly oriented short poly vinyl alcohol (PVA) fibers (2% v/v) were used to reinforce the relatively brittle low calcium (Class F) fly ash-based geopolymer matrix. The matrix and composite properties of the developed fly ash-based DFRGCs including workability of the fresh matrix, density, compressive strength, matrix fracture properties comprising elastic modulus, fracture toughness and composite crack tip toughness, and flexural behavior were evaluated. A reference ductile fiber reinforced cementitious composite (DFRCC) with water to cement ratio corresponding to the activator solution to fly ash ratio of the DFRGCs was also made for comparison. Experimental results revealed that all DFRGCs, regardless of their type of activator combinations, exhibited deflection hardening behavior accompanied by multiple fine cracks in bending. The DFRGC-Na-1composite exhibited superior deflection capacity, matrix fracture properties, compressive and flexural strengths with significantly enhanced composite ductility and toughness.
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Comparative Deflection Hardening Behavior of Fly Ash-Based Geopolymer Composite with the Conventional Cement-Based CompositeNematollahi, B.; Sanjayan, J.; Shaikh, Faiz (2014)This paper compares the behavior of a recently developed fly ash-based ductile fiber reinforced geopolymer composite (DFRGC) exhibiting deflection hardening and multiple cracking behavior in flexure with its cement-based ...
Shaikh, F.U.A. (2013)This paper reports the newly developed ductile fibre reinforced geopolymer composite (DFRGC) exhibiting deflection hardening and multiple cracking behaviour. The binder of the above composite is different from that used ...
Influence of the type of activator combinations on the deflection hardening behavior of geopolymer compositesNematollahi, B.; Sanjayan, J.; Shaikh, Faiz (2014)This paper presents the effects of two different sodium-based (Na-based) and potassium based (K-based) activator combinations on the properties of a recently developed fly ash-based ductile fiber reinforced geopolymer ...