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Vargas AS, Molin DC, Vilelac ACF, da Silva FJ, Pavão B, Veit H (2011) The effects of Na2O/SiO2 molar ratio, curing temperature and age on compressive strength, morphology and microstructure of alkali-activated fly ash-based geopolymers. Cem Concr Compos 33(6):653–660. https://doi.org/10.1016/j.cemconcomp.2011.03.006

Fly ash and granulated blast-furnace slag can be considered "multifunctional waste." This study is focused on properties of a non-cement binder prepared from slag and fly ash activated by solid alkali activator. Fly ash was milled (2.5, 5.0, and 7.5 min) in order to increase its reactivity, and particle size distribution, specific surface area, and grain morphology were determined for all milled FA samples. Two GBFS + FA mixtures (70:30 and 85:15 w/w) were studied. Prepared mixtures were activated by solid alkali activator (Na2SiO3). Optimal weight ratios were calculated for CaO, SiO2, and Al2O3 components. Properties of the mixtures were studied in dependence on the GBFS:FA mass ratio and FA milling time (0–7.5 min). After 2 and 28 days of hydration, compressive strength of all mixtures exceeded 20 and 60 MPa, respectively. The 85:15 ratio led to generally higher compressive strength 108.3 MPa was reached after 90 days using FA milled for 7.5 min. Corrosion resistance was tested by exposing mixtures to distilled water, 0.5% HCl, and 3% Na2SO4 for 65 days, and evaluated by measuring changes in CS. Also the corrosion resistance was found higher (Na2SO4) than and comparable (HCl, water) to the 70:30 ratio. This study aims to show that GBFS + FA mixtures (70:30 and 85:15 w/w) activated by solid Na2SiO3 can achieve high CS and good corrosion resistance.

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At 300-600 meters per minute (using a carbide tool) aluminium has a similar cutting speed to wood. But unlike when cutting wood, the optimal feeds and speeds ...

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Aug 24, 2018 — 1 Answer 1 ... Pantries built with studs and drywall often waste a ton of space, and this looks to be no different. You might be better off ...

This second edition cancels and replaces the first edition (ISO 13919-1:1996) which has been technically revised. The main changes compared to the previous ...

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This work was supported by Ministry of Education, Youth and Sports of the Czech Republic via the “Institute of Environmental Technology—Excellent Research” project [Grant Number CZ.02.1.01/0.0/0.0/16_019/0000853]; the “Research on the management of waste, materials and other products of metallurgy and related sectors” project [Grant Number CZ.02.1.01/0.0/0.0/17_049/0008426]; and the SGS projects [Grant Numbers SP2022/13 and SP2022/68].

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Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.

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Department of Thermal Engineering, Faculty of Materials Science and Technology, Institute of Environmental Technology, CEET, VSB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00, Ostrava, Czech Republic

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Institute of Environmental Technology, CEET, Nanotechnology Centre, CEET, VSB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00, Ostrava, Czech Republic

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Centre for Advanced Innovation Technology, VSB-Technical University of Ostrava, 17. Listopadu 2172/15, 708 00, Ostrava, Czech Republic

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