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Autogenous shrinkage of alkali-activated fly ash slag paste

Fang, G; Zhang, M; (2017) Autogenous shrinkage of alkali-activated fly ash slag paste. In: Proceedings of the 37th Annual Cement and Concrete Science Conference. IOM³: London, UK. Green open access

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Abstract

The autogenous shrinkage of alkali-activated fly ash/slag (AAFS) pastes during first 24 h after casting is an important engineering property, as it significantly contributes to ultimate shrinkage and cracking risk. However, the studies on this property are still limited. The objective of this work is to provide a better understanding of autogenous shrinkage of AAFS pastes at very early age (<24 h). The autogenous shrinkage of AAFS pastes with 10%, 20% and 30% slag replacement ratios of fly ash are estimated. A series of tests including workability, setting time and chemical reaction tests are conducted to investigate shrinkage mechanism of AAFS pastes. The results show that the ultimate autogenous shrinkage and the highest shrinkage rate of AAFS pastes increases significantly from 1271 to 1740 µɛ and from 201 to 943 µɛ/h respectively as slag replacement ratio increases from 10% to 30%. This is likely because the additional slag contents accelerate the formation of aluminosilicate gels and result in reorganization and rearrangement of microstructures. Additionally, AAFS paste with a larger autogenous shrinkage exhibits a worse workability and shorter setting time. The different reaction processes lead to the different early-age autogenous shrinkage of these AAFS mixtures.

Type: Proceedings paper
Title: Autogenous shrinkage of alkali-activated fly ash slag paste
Event: 37th Annual Cement and Concrete Science Conference
Location: London, UK
Dates: 11th-12th September 2017
Open access status: An open access version is available from UCL Discovery
Publisher version: https://www.iom3.org/cementitious-materials-group/...
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.
UCL classification: UCL
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
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Chemistry
URI: https://discovery.ucl.ac.uk/id/eprint/10060701
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