Abstract
This paper proposes a novel mixing method for preparing the alkali-activated materials (AAMs) along with polycarboxylate admixture named as “Hybrid-mixing”. A comparative experimental study was conducted on alkali-activated pastes prepared using conventional one-part (1GP), two-part (2GP) and hybrid-mixing (HM) approaches. The effects of the mixing approach on the flowability, compressive strength and total porosity of the AAMs were reported. The precursor used in all the mixes was a blend of 50% low-calcium Class-F fly ash and 50% slag, while the alkali activator used was solid anhydrous sodium metasilicate (Na2SiO3-Anhydrous) powder along with tap water and polycarboxylate admixture. The water-to-binder ratio was fixed at 0.4 for all mixes.
It was found that HM-AAMs achieved a relatively higher flowability (up to 16%) relative to both 1GP- and 2GP-AAMs. Further, the compressive strength of the HM-AAMs was 40% and 20% higher in reference with the 1GP- and 2GP-AAMs, respectively. The total porosity results were in consistence with the compressive strength results at which the HM-AAMs showed a markedly lower total porosity compared to that of 1GP- and 2GP-AAMs.
It was found that HM-AAMs achieved a relatively higher flowability (up to 16%) relative to both 1GP- and 2GP-AAMs. Further, the compressive strength of the HM-AAMs was 40% and 20% higher in reference with the 1GP- and 2GP-AAMs, respectively. The total porosity results were in consistence with the compressive strength results at which the HM-AAMs showed a markedly lower total porosity compared to that of 1GP- and 2GP-AAMs.
Original language | English |
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Title of host publication | 3rd ACF Symposium |
Subtitle of host publication | Assessment and Intervention of Existing Structures |
Publisher | Asian Concrete Federation |
Pages | 53-56 |
Number of pages | 4 |
Publication status | Published - Sept 2019 |
Event | 3rd ACF Symposium: Assessment and Intervention of Existing Structures - Sapporo, Japan Duration: 10 Sept 2019 → 11 Sept 2019 |
Forum/Symposium
Forum/Symposium | 3rd ACF Symposium: Assessment and Intervention of Existing Structures |
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Country/Territory | Japan |
City | Sapporo |
Period | 10/09/19 → 11/09/19 |