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Synthesis of fly ash/metakaolin geopolymer for concrete retrofitting application
Author(s) -
Ding YungChin,
Chang WenHua,
Lee WeiHao,
Wang Shuming,
Cheng TaWui
Publication year - 2018
Publication title -
structural concrete
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.912
H-Index - 34
eISSN - 1751-7648
pISSN - 1464-4177
DOI - 10.1002/suco.201700286
Subject(s) - materials science , metakaolin , geopolymer , fly ash , compressive strength , composite material , polymer concrete , epoxy , cement
The purpose of this research is to use fly ash as raw material to synthesize geopolymer paste that can replace traditional epoxy resin for concrete reinforcement purpose. Fly ash and metakaolin are mixed with alkali solution at predetermined SiO 2 /Na 2 O modulus to form geopolymer pastes, which were then used as a binding agent between carbon fiber reinforced polymer (CFRP) and the concrete substrate. According to the test results, the geopolymer paste synthesized with 0.75 SiO 2 /Na 2 O modulus alkali activator have the highest mechanical strength and fire resistance. Under ambient condition, the compressive strength of the concrete cylinder bonded to one layer and two layers CFRP using geopolymers binder is 1.5 times and 2 times of original concrete cylinder, respectively. Under 85% compressive strength loading and elevated temperature, the CFRP (geopolymer) bonded concrete cylinder failed at 516 °C. These test results proved that geopolymer can be a potential binding material for concrete rehabilitation due to its high‐mechanical strength and excellent fire resistance.