Print Email Facebook Twitter Evaluation of rheology and strength development of alkali-activated slag with different silicates sources Title Evaluation of rheology and strength development of alkali-activated slag with different silicates sources Author Sun, Yubo (Universiteit Gent) Ghorbani, Saeid (Universiteit Gent) Dai, Xiaodi (Universiteit Gent) Ye, G. (TU Delft Materials and Environment; Universiteit Gent) De Schutter, Geert (Universiteit Gent) Date 2022 Abstract This study provides a detailed investigation on the reproducibility of two groups of alkali-activated slag (AAS) mixtures, from both fresh properties and strength development perspectives. Three different commercial sodium silicate solutions and one lab-produced silicate activator (made of silica fume and sodium hydroxide) were used to prepare AAS pastes with the same nominal composition in each group. The reaction process of each AAS mixture was monitored by calorimetry and ultrasonic pulse velocity (UPV) measurements. Meanwhile, mini-slump and flow curve tests measured by rheometer were conducted in the first hour to characterize the evolution of fresh properties. The compressive and flexural strength of hardened AAS mortars were measured at different curing ages. The results revealed that AAS pastes prepared with three different sodium silicate solutions exhibited almost identical reaction kinetics, as well as the evolution of fresh properties and strength development. However, the reaction took place rather fast in AAS pastes made of silica fume. These mixtures showed worse rheology and less strength than the corresponding mixtures prepared with sodium silicate solutions. Furthermore, the present study also showed the feasibility of making the same AAS paste through different class commercial sodium silicate solutions. Subject Alkali-activated slagReproducibilityRheologySodium silicateStrength To reference this document use: http://resolver.tudelft.nl/uuid:0a227967-acee-4725-865c-07cffcb0e821 DOI https://doi.org/10.1016/j.cemconcomp.2022.104415 Embargo date 2023-07-01 ISSN 0958-9465 Source Cement and Concrete Composites, 128 Bibliographical note Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public. Part of collection Institutional Repository Document type journal article Rights © 2022 Yubo Sun, Saeid Ghorbani, Xiaodi Dai, G. Ye, Geert De Schutter Files PDF 1_s2.0_S0958946522000117_main.pdf 7.73 MB Close viewer /islandora/object/uuid:0a227967-acee-4725-865c-07cffcb0e821/datastream/OBJ/view