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An effective approach to improve the performance of PC-based superplasticizer in alkali-activated slag

Ren, J; Bai, Y; Zhou, Q; Yang, C; Earle, M; (2016) An effective approach to improve the performance of PC-based superplasticizer in alkali-activated slag. In: International Workshop on Innovation in Low-carbon Cement & Concrete Technology - 2016. (pp. pp. 133-138). : London, UK. Green open access

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Abstract

The lack of workability has hindered the industriallisation of alkali-activated slag (AAS) - a novel, low carbon cementitious building material. In order to address this main barrier, adding superplasticiser (SP) is essential. The main reason causing the dysfunction of current commercial SP in AAS has been identified as competitive adsorption between the SPs and the activators. The separate SP addition methods (adding SP and activator separately) offers the potentials to tackle the above issue. In this paper, the effects of separate addition methods of 134 lignosulfonate superplasticiser (LS) in AAS activated by NaOH were investigated. The adsorption between the LS and the slag was examined to understand the interaction between the SP and the slag. The workability and rheological properties of fresh NaOH-activated slag and the compressive strength of hardened NaOH-activated slag were also investigated. The results indicated that the separate addition methods reduced the competitive adsorption between the SPs and the NaOH activator, leading to a higher adsorption of the SPs on the slag. Consequently, the workability and rheological properties of NaOH-activated slag was enhanced by separate addition methods without reducing the compressive strength of hardened NaOH-activated slag.

Type: Proceedings paper
Title: An effective approach to improve the performance of PC-based superplasticizer in alkali-activated slag
Event: International Workshop on Innovation in Low-carbon Cement & Concrete Technology - 2016
Location: London, UK
Dates: 21 September 2016 - 24 September 2016
Open access status: An open access version is available from UCL Discovery
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Superplasticiser, Alkali-activated slag, Separate addition, Adsorption, Rheological Properties.
UCL classification: UCL > Provost and Vice Provost Offices
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.ucl.ac.uk/id/eprint/1523317
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