Effect of NaOH concentration and curing regime on geopolymer
Abstract The effect of alkali concentration and curing temperature regime on fly ash-based geopolymer pastes was investigated in this study by using NaOH solutions. Prismatic specimens were molded, cured at 65 °C and 85 °C and submitted to flexural and compressive strength tests. Unreacted fly ash a...
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| Format: | Article |
| Language: | English |
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Instituto Brasileiro do Concreto (IBRACON)
2017-11-01
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| Series: | Revista IBRACON de Estruturas e Materiais |
| Subjects: | |
| Online Access: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952017000601174&tlng=en |
| _version_ | 1798020664746049536 |
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| author | C. N. LIVI W. L. REPETTE |
| author_facet | C. N. LIVI W. L. REPETTE |
| author_sort | C. N. LIVI |
| collection | DOAJ |
| description | Abstract The effect of alkali concentration and curing temperature regime on fly ash-based geopolymer pastes was investigated in this study by using NaOH solutions. Prismatic specimens were molded, cured at 65 °C and 85 °C and submitted to flexural and compressive strength tests. Unreacted fly ash and geopolymers were characterized by X-ray diffraction and thermogravimetric analysis. In general, the mechanical strength was enhanced by increasing the molar concentration and the curing temperature. This trend was confirmed by thermogravimetric data. However, for a lower amount of NaOH there were no significant differences between the strength results. The mixture with the highest strength was obtained with the 16 M NaOH solution and curing temperature of 85 °C, which resulted in flexural strength of 4.20 MPa, compressive strength of 21.35 MPa and also the highest weight loss of 9.89%. |
| first_indexed | 2024-04-11T17:01:32Z |
| format | Article |
| id | doaj.art-8ecd895735fd46ab9fc078b8b4b133fb |
| institution | Directory Open Access Journal |
| issn | 1983-4195 |
| language | English |
| last_indexed | 2024-04-11T17:01:32Z |
| publishDate | 2017-11-01 |
| publisher | Instituto Brasileiro do Concreto (IBRACON) |
| record_format | Article |
| series | Revista IBRACON de Estruturas e Materiais |
| spelling | doaj.art-8ecd895735fd46ab9fc078b8b4b133fb2022-12-22T04:13:09ZengInstituto Brasileiro do Concreto (IBRACON)Revista IBRACON de Estruturas e Materiais1983-41952017-11-011061174118110.1590/s1983-41952017000600003Effect of NaOH concentration and curing regime on geopolymerC. N. LIVIW. L. REPETTEAbstract The effect of alkali concentration and curing temperature regime on fly ash-based geopolymer pastes was investigated in this study by using NaOH solutions. Prismatic specimens were molded, cured at 65 °C and 85 °C and submitted to flexural and compressive strength tests. Unreacted fly ash and geopolymers were characterized by X-ray diffraction and thermogravimetric analysis. In general, the mechanical strength was enhanced by increasing the molar concentration and the curing temperature. This trend was confirmed by thermogravimetric data. However, for a lower amount of NaOH there were no significant differences between the strength results. The mixture with the highest strength was obtained with the 16 M NaOH solution and curing temperature of 85 °C, which resulted in flexural strength of 4.20 MPa, compressive strength of 21.35 MPa and also the highest weight loss of 9.89%.http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952017000601174&tlng=enalkali-activated binderstrengthx-ray diffractionthermal analysis |
| spellingShingle | C. N. LIVI W. L. REPETTE Effect of NaOH concentration and curing regime on geopolymer Revista IBRACON de Estruturas e Materiais alkali-activated binder strength x-ray diffraction thermal analysis |
| title | Effect of NaOH concentration and curing regime on geopolymer |
| title_full | Effect of NaOH concentration and curing regime on geopolymer |
| title_fullStr | Effect of NaOH concentration and curing regime on geopolymer |
| title_full_unstemmed | Effect of NaOH concentration and curing regime on geopolymer |
| title_short | Effect of NaOH concentration and curing regime on geopolymer |
| title_sort | effect of naoh concentration and curing regime on geopolymer |
| topic | alkali-activated binder strength x-ray diffraction thermal analysis |
| url | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1983-41952017000601174&tlng=en |
| work_keys_str_mv | AT cnlivi effectofnaohconcentrationandcuringregimeongeopolymer AT wlrepette effectofnaohconcentrationandcuringregimeongeopolymer |