Durability properties of ladle slag geopolymer mortar based on fly ash
This paper presents the results of tests of physical-mechanical, durability and microscopic properties of geopolymer mortar mixtures based on fly ash and ladle slag. The mixtures are alkali-activated using sodium silicate and sodium hydroxide solution. Firstly, the effects of different fly...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
International Institute for the Science of Sintering, Beograd
2020-01-01
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| Series: | Science of Sintering |
| Subjects: | |
| Online Access: | http://www.doiserbia.nb.rs/img/doi/0350-820X/2020/0350-820X2002231B.pdf |
| Summary: | This paper presents the results of tests of physical-mechanical, durability
and microscopic properties of geopolymer mortar mixtures based on fly ash
and ladle slag. The mixtures are alkali-activated using sodium silicate and
sodium hydroxide solution. Firstly, the effects of different fly ash (class
„F“) particle sizes on the characteristics of the mortar mixtures were
examined when binder and alkali activator were cured at 95ºC for 24 h, also
pozzolanic activity and strength activity index were investigated. After
that, fly ash ground of optimal particle sizes (0,09 mm) was replaced with
ladle slag, 0 to 20% of the mass, the replacement steps being 5%. The
specimens having dimensions 4x4x16 cm were then cured in ambient conditions,
and the effects of replacement of a part of fly ash with ladle slag were
determined by testing water absorption, flexural and compressive strength,
freeze-thaw resistance, sulfate attack, ultrasound velocity, FT-IR
spectroscopy and leaching of heavy metals. According to the test results of
compressive strength resistance of geopolymer mortars exposed to sulfate
solution, the mortar made with fly ash and ladle slag showed better
resistance to sulfate attack than the mortar made with fly ash only. |
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| ISSN: | 0350-820X 1820-7413 |