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Application of geopolymer paste for concrete repair
Author(s) -
Ding YungChin,
Cheng TaWui,
Dai YuSheng
Publication year - 2017
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.201600161
Subject(s) - geopolymer , compressive strength , fly ash , materials science , ground granulated blast furnace slag , flexural strength , portland cement , composite material , geopolymer cement , cement
In this study, ground granulated blast furnace slag and coal fly ash were used as raw materials to prepare geopolymer paste as repair material for concrete structure. The functional properties, such as compressive strength, fluxural strength, and bonding strength between slag/fly ash based geopolymer paste and paste substrate were investigated. The SiO 2 / Na 2 O molar ratio of the alkali activator plays an important role on the strength of geopolymer paste. The nature of the geopolymeric reaction product was examined using FTIR and NMR . The compressive strengths and flexural strength of the geopolymer paste were 47 MPa and 16 MPa , respectively. For concrete substrate bonded with geopolymer paste, the compressive strength test shows up to 120% repairing rate can be achieved. By comparing with Portland cement, it can be proved that the slag/fly ash based geopolymer paste has very good potential for further engineering development in the future.