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Alkali-activated slag concrete: Fresh and hardened behaviour

AuthorsPuertas, F.; González-Fonteboa, B.; González-Taboada, I.; Alonso, M. M.; Torres-Carrasco, Manuel; Rojo, G.; Martínez Abella, Fernando
Alkaline activation
Blast furnace slag
Bingham model
Hardened behaviour
Issue Date2018
CitationCement and Concrete Composites 85: 22-31 (2018)
AbstractThe behaviour of fresh and hardened alkali-activated slag (AAS) and OPC concretes was compared and the effect of mixing time assessed. OPC and AAS concrete slump and rheological results proved to differ, particularly when the slag was activated with waterglass (WG). The nature of the alkaline activator was the key determinant in AAS concrete rheology. Bingham models afforded a good fit to all the OPC and AAS concretes. In OPC and NaOH-activated AAS concretes, longer mixing had an adverse effect on rheology while improving hardened performance only slightly. In WG-AAS concrete, longer mixing times, improved mechanical properties and also rheological behaviour was enhanced, in which those conditions were required to break down the microstructure. Longer mixing raised thixotropy in OPC and NaOH-activated AAS concretes, but lowered the value of this parameter in waterglass-activated slag concrete.
Publisher version (URL)https://doi.org/10.1016/j.cemconcomp.2017.10.003
Appears in Collections:(IETCC) Artículos
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