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Potassium alkali concentration and heat treatment affected metakaolin-based geopolymer
https://orcid.org/0000-0002-0970-7227
https://orcid.org/0000-0001-6980-4646
Highlights Using KOH and K2SiO3 as alkali solution instead of NaOH and Na2SiO3. Very high concentrations of KOH in used. Heat-treated at 550°C.
Abstracts Geopolymers prepared using KOH and K2SiO3 alkali solution instead of the more common NaOH and Na2SiO3 are reported. The influence of KOH concentration, curing temperature and heat treatment on the properties of metakaolin-based geopolymers were studied. The KOH concentrations were varied at 6, 8, 10, 20, 30 and 40M, the K2SiO3/KOH ratios used were 1 and 1.5 and curing temperatures of 40°C and 60°C for 24h were applied. Results showed that geopolymer with 10M KOH, cured at 40°C, 24h and heat treated at 550°C gave the highest compressive strength at 28days. The heat treatment process caused the porosity of geopolymer increased because water was eliminated from the geopolymer structure by the applied heat, therefore, the density decreased whereas the water absorption and the porosity of geopolymer specimens increased. The microstructure of heat-treated specimens showed more mature geopolymer matrix than that of non heat-treated ones leading to higher compressive strength in the former geopolymers and had ceramic-like property.
Potassium alkali concentration and heat treatment affected metakaolin-based geopolymer
https://orcid.org/0000-0002-0970-7227
https://orcid.org/0000-0001-6980-4646
Highlights Using KOH and K2SiO3 as alkali solution instead of NaOH and Na2SiO3. Very high concentrations of KOH in used. Heat-treated at 550°C.
Abstracts Geopolymers prepared using KOH and K2SiO3 alkali solution instead of the more common NaOH and Na2SiO3 are reported. The influence of KOH concentration, curing temperature and heat treatment on the properties of metakaolin-based geopolymers were studied. The KOH concentrations were varied at 6, 8, 10, 20, 30 and 40M, the K2SiO3/KOH ratios used were 1 and 1.5 and curing temperatures of 40°C and 60°C for 24h were applied. Results showed that geopolymer with 10M KOH, cured at 40°C, 24h and heat treated at 550°C gave the highest compressive strength at 28days. The heat treatment process caused the porosity of geopolymer increased because water was eliminated from the geopolymer structure by the applied heat, therefore, the density decreased whereas the water absorption and the porosity of geopolymer specimens increased. The microstructure of heat-treated specimens showed more mature geopolymer matrix than that of non heat-treated ones leading to higher compressive strength in the former geopolymers and had ceramic-like property.
Potassium alkali concentration and heat treatment affected metakaolin-based geopolymer
https://orcid.org/0000-0002-0970-7227
https://orcid.org/0000-0001-6980-4646
Highlights Using KOH and K2SiO3 as alkali solution instead of NaOH and Na2SiO3. Very high concentrations of KOH in used. Heat-treated at 550°C.
Abstracts Geopolymers prepared using KOH and K2SiO3 alkali solution instead of the more common NaOH and Na2SiO3 are reported. The influence of KOH concentration, curing temperature and heat treatment on the properties of metakaolin-based geopolymers were studied. The KOH concentrations were varied at 6, 8, 10, 20, 30 and 40M, the K2SiO3/KOH ratios used were 1 and 1.5 and curing temperatures of 40°C and 60°C for 24h were applied. Results showed that geopolymer with 10M KOH, cured at 40°C, 24h and heat treated at 550°C gave the highest compressive strength at 28days. The heat treatment process caused the porosity of geopolymer increased because water was eliminated from the geopolymer structure by the applied heat, therefore, the density decreased whereas the water absorption and the porosity of geopolymer specimens increased. The microstructure of heat-treated specimens showed more mature geopolymer matrix than that of non heat-treated ones leading to higher compressive strength in the former geopolymers and had ceramic-like property.
Potassium alkali concentration and heat treatment affected metakaolin-based geopolymer
Tippayasam, Chayanee (author) / Balyore, Pongpob (author) / Thavorniti, Parjaree (author) / Kamseu, Elie (author) / Leonelli, Cristina (author) / Chindaprasirt, Prinya (author) / Chaysuwan, Duangrudee (author)
Construction and Building Materials ; 104 ; 293-297
2015-11-07
5 pages
Article (Journal)
Electronic Resource
English
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