Effects of the alkaline solution/binder ratio and curing condition on the mechanical properties of alkali-activated fly ash mortars
The study investigates the effects of the alkaline solution/binder ratio and the curing condition on the mechanical properties of alkali-activated fly ash (AAFA) mortars. Class F fly ash was used as the raw material, and sodium hydroxide and liquid sodium silicate were used for the preparation of al...
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| Format: | Article |
| Language: | English |
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De Gruyter
2017-09-01
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| Series: | Science and Engineering of Composite Materials |
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| Online Access: | https://doi.org/10.1515/secm-2015-0305 |
| _version_ | 1818449957872467968 |
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| author | Chi Maochieh |
| author_facet | Chi Maochieh |
| author_sort | Chi Maochieh |
| collection | DOAJ |
| description | The study investigates the effects of the alkaline solution/binder ratio and the curing condition on the mechanical properties of alkali-activated fly ash (AAFA) mortars. Class F fly ash was used as the raw material, and sodium hydroxide and liquid sodium silicate were used for the preparation of alkaline activators. Three alkaline solution-to-binder ratios (0.35, 0.5, and 0.65) and four different initial curing conditions (curing in air at ambient temperature for 24 h, 30°C for 24 h, 65°C for 12 h, and 85°C for 6 h) were considered. Test results show that AAFA mortars with alkaline solution-to-binder ratio of 0.35 had higher compressive strength, lower drying shrinkage, lower water absorption, and lower initial surface absorption rate than the other mortars. Furthermore, the curing condition influenced the compressive strength development and drying shrinkage of AAFA mortars at early ages. AAFA mortars cured at 65°C for 12 h appeared to have superior mechanical properties. XRD demonstrates that the hydration products of AAFA mortars are mainly amorphous alkaline aluminosilicate gel, which attributed to the compressive strength. Consequently, the alkaline solution-to-binder ratio significantly affects more the mechanical properties than the curing condition based on the presented results. |
| first_indexed | 2024-12-14T20:43:40Z |
| format | Article |
| id | doaj.art-953ef4d42d864e27be2ab58128dbd193 |
| institution | Directory Open Access Journal |
| issn | 0792-1233 2191-0359 |
| language | English |
| last_indexed | 2024-12-14T20:43:40Z |
| publishDate | 2017-09-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Science and Engineering of Composite Materials |
| spelling | doaj.art-953ef4d42d864e27be2ab58128dbd1932022-12-21T22:48:09ZengDe GruyterScience and Engineering of Composite Materials0792-12332191-03592017-09-0124577378210.1515/secm-2015-0305Effects of the alkaline solution/binder ratio and curing condition on the mechanical properties of alkali-activated fly ash mortarsChi Maochieh0Department of Fire Science, WuFeng University, 117, Sec 2, Chiankuo Road, Minshiung Township, Chiayi County 621, Taiwan, ROCThe study investigates the effects of the alkaline solution/binder ratio and the curing condition on the mechanical properties of alkali-activated fly ash (AAFA) mortars. Class F fly ash was used as the raw material, and sodium hydroxide and liquid sodium silicate were used for the preparation of alkaline activators. Three alkaline solution-to-binder ratios (0.35, 0.5, and 0.65) and four different initial curing conditions (curing in air at ambient temperature for 24 h, 30°C for 24 h, 65°C for 12 h, and 85°C for 6 h) were considered. Test results show that AAFA mortars with alkaline solution-to-binder ratio of 0.35 had higher compressive strength, lower drying shrinkage, lower water absorption, and lower initial surface absorption rate than the other mortars. Furthermore, the curing condition influenced the compressive strength development and drying shrinkage of AAFA mortars at early ages. AAFA mortars cured at 65°C for 12 h appeared to have superior mechanical properties. XRD demonstrates that the hydration products of AAFA mortars are mainly amorphous alkaline aluminosilicate gel, which attributed to the compressive strength. Consequently, the alkaline solution-to-binder ratio significantly affects more the mechanical properties than the curing condition based on the presented results.https://doi.org/10.1515/secm-2015-0305alkali-activated fly ash (aafa)alkaline solution-to-binder ratiocuring conditionmechanical property |
| spellingShingle | Chi Maochieh Effects of the alkaline solution/binder ratio and curing condition on the mechanical properties of alkali-activated fly ash mortars Science and Engineering of Composite Materials alkali-activated fly ash (aafa) alkaline solution-to-binder ratio curing condition mechanical property |
| title | Effects of the alkaline solution/binder ratio and curing condition on the mechanical properties of alkali-activated fly ash mortars |
| title_full | Effects of the alkaline solution/binder ratio and curing condition on the mechanical properties of alkali-activated fly ash mortars |
| title_fullStr | Effects of the alkaline solution/binder ratio and curing condition on the mechanical properties of alkali-activated fly ash mortars |
| title_full_unstemmed | Effects of the alkaline solution/binder ratio and curing condition on the mechanical properties of alkali-activated fly ash mortars |
| title_short | Effects of the alkaline solution/binder ratio and curing condition on the mechanical properties of alkali-activated fly ash mortars |
| title_sort | effects of the alkaline solution binder ratio and curing condition on the mechanical properties of alkali activated fly ash mortars |
| topic | alkali-activated fly ash (aafa) alkaline solution-to-binder ratio curing condition mechanical property |
| url | https://doi.org/10.1515/secm-2015-0305 |
| work_keys_str_mv | AT chimaochieh effectsofthealkalinesolutionbinderratioandcuringconditiononthemechanicalpropertiesofalkaliactivatedflyashmortars |