File Download
There are no files associated with this item.
Links for fulltext
(May Require Subscription)
- Publisher Website: 10.1016/j.cemconres.2019.105868
- Scopus: eid_2-s2.0-85071448806
- WOS: WOS:000503086100007
- Find via
Supplementary
- Citations:
- Appears in Collections:
Article: Mechanism of sulfate attack on alkali-activated slag: The role of activator composition
Title | Mechanism of sulfate attack on alkali-activated slag: The role of activator composition |
---|---|
Authors | |
Keywords | Alkali-activated slag Sulfate attack Mg-Al layered double hydroxides Chemical durability |
Issue Date | 2019 |
Publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/cemconres |
Citation | Cement and Concrete Research, 2019, v. 125, p. article no. 105868 How to Cite? |
Abstract | In this work, the degradation mechanisms of alkali-activated slag (AAS), prepared with various activator compositions, exposed to 5% Na2SO4 and MgSO4 solutions are studied. The results show that upon Na2SO4 attack, little ettringite formation and compositional alteration occur in AAS with little length expansion. However, upon MgSO4 attack, brucite, gypsum, and magnesium-aluminosilicate-hydrate (M-A-S-H) are observed in altered layers of hardened AAS pastes. The sulfate-activated slag shows a weaker resistance against MgSO4 attack than NaOH- and Na2CO3-counterparts due to a lower pH value in pore solution and thus absence of brucite protective layer. The reacted products in hardened AAS pastes have a high capacity against dealumination in sulfate environments, contributing to superior sulfate resistance over traditional ordinary Portland cement (OPC). |
Persistent Identifier | http://hdl.handle.net/10722/293550 |
ISSN | 2023 Impact Factor: 10.9 2023 SCImago Journal Rankings: 4.781 |
ISI Accession Number ID |
DC Field | Value | Language |
---|---|---|
dc.contributor.author | Ye, H | - |
dc.contributor.author | CHEN, Z | - |
dc.contributor.author | Huang, L | - |
dc.date.accessioned | 2020-11-23T08:18:25Z | - |
dc.date.available | 2020-11-23T08:18:25Z | - |
dc.date.issued | 2019 | - |
dc.identifier.citation | Cement and Concrete Research, 2019, v. 125, p. article no. 105868 | - |
dc.identifier.issn | 0008-8846 | - |
dc.identifier.uri | http://hdl.handle.net/10722/293550 | - |
dc.description.abstract | In this work, the degradation mechanisms of alkali-activated slag (AAS), prepared with various activator compositions, exposed to 5% Na2SO4 and MgSO4 solutions are studied. The results show that upon Na2SO4 attack, little ettringite formation and compositional alteration occur in AAS with little length expansion. However, upon MgSO4 attack, brucite, gypsum, and magnesium-aluminosilicate-hydrate (M-A-S-H) are observed in altered layers of hardened AAS pastes. The sulfate-activated slag shows a weaker resistance against MgSO4 attack than NaOH- and Na2CO3-counterparts due to a lower pH value in pore solution and thus absence of brucite protective layer. The reacted products in hardened AAS pastes have a high capacity against dealumination in sulfate environments, contributing to superior sulfate resistance over traditional ordinary Portland cement (OPC). | - |
dc.language | eng | - |
dc.publisher | Pergamon. The Journal's web site is located at http://www.elsevier.com/locate/cemconres | - |
dc.relation.ispartof | Cement and Concrete Research | - |
dc.subject | Alkali-activated slag | - |
dc.subject | Sulfate attack | - |
dc.subject | Mg-Al layered double hydroxides | - |
dc.subject | Chemical durability | - |
dc.title | Mechanism of sulfate attack on alkali-activated slag: The role of activator composition | - |
dc.type | Article | - |
dc.identifier.email | Ye, H: hlye@hku.hk | - |
dc.identifier.email | Huang, L: huangle@hku.hk | - |
dc.identifier.authority | Ye, H=rp02379 | - |
dc.description.nature | link_to_subscribed_fulltext | - |
dc.identifier.doi | 10.1016/j.cemconres.2019.105868 | - |
dc.identifier.scopus | eid_2-s2.0-85071448806 | - |
dc.identifier.hkuros | 319199 | - |
dc.identifier.volume | 125 | - |
dc.identifier.spage | article no. 105868 | - |
dc.identifier.epage | article no. 105868 | - |
dc.identifier.isi | WOS:000503086100007 | - |
dc.publisher.place | United Kingdom | - |
dc.identifier.issnl | 0008-8846 | - |