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Mechanical properties and durability of volcanic ash based geopolymer mortars
Highlights Volcanic ash based geopolymer mortars perform well under wet-dry cycles. Samples cured at 27°C have better acid resistance than those cured at 80°C. The interaction of sulfuric acid with geopolymer binder led gypsum formation.
Abstract The mechanical properties and durability of volcanic ash based geopolymer mortars synthesized at 27°C and 80°C were evaluated. The water absorption and apparent porosity increase up to 28days, then become almost constant with time. The bulk density of specimens cured at 27°C decreases continuously with time, whereas it doesn’t change considerably with time for specimens cured at 80°C. Geopolymer specimens cured at 27°C achieved the compressive strength of 20.5MPa after 28days and it no longer increases significantly with time. While a maximum strength of 37.9MPa is reached at 90days for specimens cured at 80°C. Specimens performed well in wetting and drying conditions. Geopolymer specimens obtained at 27°C developed a better resistance to 5% sulfuric acid than the ones cured at 80°C. The microstructure of geopolymer specimens after acid exposure revealed the formation of gypsum as a secondary phase due to the reaction between sulfuric acid and calcium from geopolymer gel. The presence of Na-rich gel in specimen cured at 27°C enhances its acid resistance. The pore structure and permeability are the key factors affecting the durability of volcanic ash based geopolymer mortars.
Mechanical properties and durability of volcanic ash based geopolymer mortars
Highlights Volcanic ash based geopolymer mortars perform well under wet-dry cycles. Samples cured at 27°C have better acid resistance than those cured at 80°C. The interaction of sulfuric acid with geopolymer binder led gypsum formation.
Abstract The mechanical properties and durability of volcanic ash based geopolymer mortars synthesized at 27°C and 80°C were evaluated. The water absorption and apparent porosity increase up to 28days, then become almost constant with time. The bulk density of specimens cured at 27°C decreases continuously with time, whereas it doesn’t change considerably with time for specimens cured at 80°C. Geopolymer specimens cured at 27°C achieved the compressive strength of 20.5MPa after 28days and it no longer increases significantly with time. While a maximum strength of 37.9MPa is reached at 90days for specimens cured at 80°C. Specimens performed well in wetting and drying conditions. Geopolymer specimens obtained at 27°C developed a better resistance to 5% sulfuric acid than the ones cured at 80°C. The microstructure of geopolymer specimens after acid exposure revealed the formation of gypsum as a secondary phase due to the reaction between sulfuric acid and calcium from geopolymer gel. The presence of Na-rich gel in specimen cured at 27°C enhances its acid resistance. The pore structure and permeability are the key factors affecting the durability of volcanic ash based geopolymer mortars.
Mechanical properties and durability of volcanic ash based geopolymer mortars
Yankwa Djobo, Jean Noël (author) / Elimbi, Antoine (author) / Kouamo Tchakouté, Hervé (author) / Kumar, Sanjay (author)
Construction and Building Materials ; 124 ; 606-614
2016-07-29
9 pages
Article (Journal)
Electronic Resource
English
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