Drying-induced changes in the structure of alkali-activated pastes
Drying of cement paste, mortar, or concrete specimens is usually required as a pre-conditioning step prior to the determination of permeability-related properties according to standard testing methods. The reaction process, and consequently the structure, of an alkali-activated slag or slag/fly...
| Main Authors: | , , , , |
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| Format: | Article |
| Language: | English |
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Springer US
2013
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| Subjects: | |
| Online Access: | http://ir.unimas.my/id/eprint/9182/ http://ir.unimas.my/id/eprint/9182/1/Drying-induced%20changes%20in%20the%20structure%20of%20alkali-activated%20pastes%20%28abstract%29.pdf |
| _version_ | 1848836507012431872 |
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| author | Idawati, Ismail Susan A., Bernal John L., Provis Sinin, Hamdan Jannie S. J., van Deventer |
| author_facet | Idawati, Ismail Susan A., Bernal John L., Provis Sinin, Hamdan Jannie S. J., van Deventer |
| author_sort | Idawati, Ismail |
| building | UNIMAS Institutional Repository |
| collection | Online Access |
| description | Drying of cement paste, mortar, or concrete
specimens is usually required as a pre-conditioning step
prior to the determination of permeability-related properties
according to standard testing methods. The reaction process,
and consequently the structure, of an alkali-activated slag or
slag/fly ash blend geopolymer binder differs from that of
Portland cement, and therefore there is little understanding
of the effects of conventional drying methods (as applied to
Portland cements) on the structure of the geopolymer
binders. Here, oven drying (60 �C), acetone treatment, and
desiccator/vacuum drying are applied to sodium silicateactivated
slag and slag/fly ash geopolymer pastes after
40 days of curing. Structural characterization via X-ray
diffraction, infrared spectroscopy, thermogravimetry, and
nitrogen sorption shows that the acetone treatment best
preserves the microstructure of the samples, while oven
drying modifies the structure of the binding gels, especially
in alkali-activated slag paste where it notably changes
the pore structure of the binder. This suggests that the
pre-conditioned drying of alkali activation-based materials
strongly affects their microstructural properties, providing
potentially misleading permeability and durability parameters
for these materials when pre-conditioned specimens are
used during standardized testing. |
| first_indexed | 2025-11-15T06:24:51Z |
| format | Article |
| id | unimas-9182 |
| institution | Universiti Malaysia Sarawak |
| institution_category | Local University |
| language | English |
| last_indexed | 2025-11-15T06:24:51Z |
| publishDate | 2013 |
| publisher | Springer US |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | unimas-91822015-10-20T01:39:24Z http://ir.unimas.my/id/eprint/9182/ Drying-induced changes in the structure of alkali-activated pastes Idawati, Ismail Susan A., Bernal John L., Provis Sinin, Hamdan Jannie S. J., van Deventer GE Environmental Sciences Drying of cement paste, mortar, or concrete specimens is usually required as a pre-conditioning step prior to the determination of permeability-related properties according to standard testing methods. The reaction process, and consequently the structure, of an alkali-activated slag or slag/fly ash blend geopolymer binder differs from that of Portland cement, and therefore there is little understanding of the effects of conventional drying methods (as applied to Portland cements) on the structure of the geopolymer binders. Here, oven drying (60 �C), acetone treatment, and desiccator/vacuum drying are applied to sodium silicateactivated slag and slag/fly ash geopolymer pastes after 40 days of curing. Structural characterization via X-ray diffraction, infrared spectroscopy, thermogravimetry, and nitrogen sorption shows that the acetone treatment best preserves the microstructure of the samples, while oven drying modifies the structure of the binding gels, especially in alkali-activated slag paste where it notably changes the pore structure of the binder. This suggests that the pre-conditioned drying of alkali activation-based materials strongly affects their microstructural properties, providing potentially misleading permeability and durability parameters for these materials when pre-conditioned specimens are used during standardized testing. Springer US 2013 Article NonPeerReviewed text en http://ir.unimas.my/id/eprint/9182/1/Drying-induced%20changes%20in%20the%20structure%20of%20alkali-activated%20pastes%20%28abstract%29.pdf Idawati, Ismail and Susan A., Bernal and John L., Provis and Sinin, Hamdan and Jannie S. J., van Deventer (2013) Drying-induced changes in the structure of alkali-activated pastes. Journal of Materials Science, 48 (9). pp. 3566-3577. ISSN 1573-4803 10.1007/s10853-013-7152-9 |
| spellingShingle | GE Environmental Sciences Idawati, Ismail Susan A., Bernal John L., Provis Sinin, Hamdan Jannie S. J., van Deventer Drying-induced changes in the structure of alkali-activated pastes |
| title | Drying-induced changes in the structure of alkali-activated pastes |
| title_full | Drying-induced changes in the structure of alkali-activated pastes |
| title_fullStr | Drying-induced changes in the structure of alkali-activated pastes |
| title_full_unstemmed | Drying-induced changes in the structure of alkali-activated pastes |
| title_short | Drying-induced changes in the structure of alkali-activated pastes |
| title_sort | drying-induced changes in the structure of alkali-activated pastes |
| topic | GE Environmental Sciences |
| url | http://ir.unimas.my/id/eprint/9182/ http://ir.unimas.my/id/eprint/9182/ http://ir.unimas.my/id/eprint/9182/1/Drying-induced%20changes%20in%20the%20structure%20of%20alkali-activated%20pastes%20%28abstract%29.pdf |