Ren, Jun;
Zhou, Qi-Zhi;
Yang, Chang-Hui;
Bai, Yun;
(2023)
Performance and interaction of sodium silicate activated slag with lignosulfonate superplasticiser added at different mixing stages.
Cement and Concrete Composites
, 136
, Article 104900. 10.1016/j.cemconcomp.2022.104900.
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Abstract
This paper investigated the effect of adding lignosulfonate (LS) superplasticiser at the different stages of mixing on the workability and rheological behaviour of sodium silicate activated slag (SSAS) in order to find a practically feasible approach to tackling the incompatibility issue between superplasticiser and alkaline activator. In addition to rheology and minislump tests, adsorption, zeta potential and environmental scanning electron microscopy tests were also undertaken to understand the interactions between the lignosulfonate and the fresh SSAS in order to reveal the mechanisms behind the observation. The results show that adding the LS and the activator separately at the different stages of mixing can significantly improve both the initial minislump and 60-min minislump retention due to the increased adsorption of LS and the improved dispersion of slag particles, with the prior addition of LS better than the delayed addition. However, a nonlinear rheological behaviour of SSAS was observed in the LS-superplasticised SSAS under separate addition and, consequently, modified Bingham model was found to be more suitable for describing this kind of rheological behaviour.
| Type: | Article |
|---|---|
| Title: | Performance and interaction of sodium silicate activated slag with lignosulfonate superplasticiser added at different mixing stages |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.cemconcomp.2022.104900 |
| Publisher version: | https://doi.org/10.1016/j.cemconcomp.2022.104900 |
| Language: | English |
| Additional information: | © 2022 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
| Keywords: | Alkali activated cement, Superplasticiser, Rheology, Granulated blast-furnace slag, Adsorption |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Civil, Environ and Geomatic Eng |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10167151 |
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