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2016 ; 9
(6
): ä Nephropedia Template TP
gab.com Text
Twit Text FOAVip
Twit Text #
English Wikipedia
Environmentally-Friendly Dense and Porous Geopolymers Using Fly Ash and Rice Husk
Ash as Raw Materials
#MMPMID28773587
Ziegler D
; Formia A
; Tulliani JM
; Palmero P
Materials (Basel)
2016[Jun]; 9
(6
): ä PMID28773587
show ga
This paper assesses the feasibility of two industrial wastes, fly ash (FA) and
rice husk ash (RHA), as raw materials for the production of geopolymeric pastes.
Three typologies of samples were thus produced: (i) halloysite activated with
potassium hydroxide and nanosilica, used as the reference sample (HL-S); (ii)
halloysite activated with rice husk ash dissolved into KOH solution (HL-R); (iii)
FA activated with the alkaline solution realized with the rice husk ash (FA-R).
Dense and porous samples were produced and characterized in terms of mechanical
properties and environmental impact. The flexural and compressive strength of
HL-R reached about 9 and 43 MPa, respectively. On the contrary, the compressive
strength of FA-R is significantly lower than the HL-R one, in spite of a
comparable flexural strength being reached. However, when porous samples are
concerned, FA-R shows comparable or even higher strength than HL-R. Thus, the
current results show that RHA is a valuable alternative to silica nanopowder to
prepare the activator solution, to be used either with calcined clay and fly ash
feedstock materials. Finally, a preliminary evaluation of the global warming
potential (GWP) was performed for the three investigated formulations. With the
mix containing FA and RHA-based silica solution, a reduction of about 90% of GWP
was achieved with respect to the values obtained for the reference formulation.