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Relative importance of Al(V) and reinforcement to the flexural strength of geopolymer composites
Author(s) -
Samuel Devon M.,
Sutrisno Andre,
Kriven Waltraud M.
Publication year - 2021
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/jace.17656
Subject(s) - metakaolin , geopolymer , flexural strength , materials science , composite material , wollastonite , sodium silicate , reinforcement , aluminium , compressive strength , raw material , chemistry , organic chemistry
We prepared 1 cm × 1 cm × 10 cm geopolymer bars from sodium silicate and six commercial metakaolins, both unreinforced and reinforced with 20 wt% of 55‐μm wollastonite (CaO·SiO 2 ) needles, to evaluate the relative contributions of five‐coordinated aluminum in the metakaolin and the presence of a reinforcing phase to the flexural strength of geopolymers. Two metakaolins, with about 20 at% and lower of five‐coordinated aluminum content, did not react sufficiently with our processing method and could not be tested. The flexural strengths of the other four geopolymers were similar at about 11–14 MPa unreinforced and 22–29 MPa reinforced. The effect of reinforcement on flexure strength is more significant than the choice of metakaolin provided that the metakaolin is reactive. The geopolymerization reaction depends on the amount of five‐coordinated aluminum present in the metakaolin and is the primary difference between the samples that reacted and those that did not react.