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- Publisher Website: 10.1016/j.conbuildmat.2023.134605
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Article: Effect of retarders on the properties of ultra-high strength alkali-activated concrete
Title | Effect of retarders on the properties of ultra-high strength alkali-activated concrete |
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Authors | |
Keywords | Retarders Retarding mechanism Setting characteristics Slag-fly ash-silica fume cement |
Issue Date | 12-Jan-2024 |
Publisher | Elsevier |
Citation | Construction and Building Materials, 2024, v. 411 How to Cite? |
Abstract | Alkali-activated slag-fly ash-silica fume cement (AA-SFSC) is suitable for the production of clinkerless alkali-activated binder-based ultra-high strength concrete (AAB-UHSC). However, using a relatively low water-to-binder ratio and a high alkali dosage to prepare AAB-UHSC leads to rapid setting and a loss of flowability. Thus, the setting time of the AA-SFSC needs to be controlled. In our study, the effect of various retarders (single retarder borax and hybrid retarder a combination of zinc nitrate hexahydrate and sodium gluconate) on the AA-SFSC was investigated. The setting characteristics, reaction kinetics, mechanical performance, pore structure alteration, mineralogical and molecular transformations, and microstructure of the AA-SFSC were systematically examined. The results showed that both borax and a combination of zinc nitrate hexahydrate and sodium gluconate had a remarkable retarding effect on AA-SFSC with a low water-to-binder ratio and high alkali dosage. However, borax had a detrimental effect on the compressive strength, and the effect of adding zinc nitrate hexahydrate and sodium gluconate as the hybrid retarders on the compressive strength depended on the dosage; and a dosage of 1% zinc nitrate hexahydrate and 2% sodium gluconate was recommended for prolonging the setting time of AA-SFSC without compromising the mechanical performance. |
Persistent Identifier | http://hdl.handle.net/10722/344299 |
ISSN | 2023 Impact Factor: 7.4 2023 SCImago Journal Rankings: 1.999 |
DC Field | Value | Language |
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dc.contributor.author | He, Haiyu | - |
dc.contributor.author | Zhi, Xudong | - |
dc.contributor.author | Fan, Feng | - |
dc.contributor.author | Ye, Hailong | - |
dc.contributor.author | Zhang, Rong | - |
dc.contributor.author | Song, Yuhuan | - |
dc.date.accessioned | 2024-07-16T03:42:22Z | - |
dc.date.available | 2024-07-16T03:42:22Z | - |
dc.date.issued | 2024-01-12 | - |
dc.identifier.citation | Construction and Building Materials, 2024, v. 411 | - |
dc.identifier.issn | 0950-0618 | - |
dc.identifier.uri | http://hdl.handle.net/10722/344299 | - |
dc.description.abstract | Alkali-activated slag-fly ash-silica fume cement (AA-SFSC) is suitable for the production of clinkerless alkali-activated binder-based ultra-high strength concrete (AAB-UHSC). However, using a relatively low water-to-binder ratio and a high alkali dosage to prepare AAB-UHSC leads to rapid setting and a loss of flowability. Thus, the setting time of the AA-SFSC needs to be controlled. In our study, the effect of various retarders (single retarder borax and hybrid retarder a combination of zinc nitrate hexahydrate and sodium gluconate) on the AA-SFSC was investigated. The setting characteristics, reaction kinetics, mechanical performance, pore structure alteration, mineralogical and molecular transformations, and microstructure of the AA-SFSC were systematically examined. The results showed that both borax and a combination of zinc nitrate hexahydrate and sodium gluconate had a remarkable retarding effect on AA-SFSC with a low water-to-binder ratio and high alkali dosage. However, borax had a detrimental effect on the compressive strength, and the effect of adding zinc nitrate hexahydrate and sodium gluconate as the hybrid retarders on the compressive strength depended on the dosage; and a dosage of 1% zinc nitrate hexahydrate and 2% sodium gluconate was recommended for prolonging the setting time of AA-SFSC without compromising the mechanical performance. | - |
dc.language | eng | - |
dc.publisher | Elsevier | - |
dc.relation.ispartof | Construction and Building Materials | - |
dc.rights | This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. | - |
dc.subject | Retarders | - |
dc.subject | Retarding mechanism | - |
dc.subject | Setting characteristics | - |
dc.subject | Slag-fly ash-silica fume cement | - |
dc.title | Effect of retarders on the properties of ultra-high strength alkali-activated concrete | - |
dc.type | Article | - |
dc.identifier.doi | 10.1016/j.conbuildmat.2023.134605 | - |
dc.identifier.scopus | eid_2-s2.0-85180414512 | - |
dc.identifier.volume | 411 | - |
dc.identifier.eissn | 1879-0526 | - |
dc.identifier.issnl | 0950-0618 | - |