Assessment of the slag and fly ash reactivity in alkali-activated pastes

Marija Nedeljkovic, Corrie van Hoek, Stefan Melzer, Sieger van der Laan, Guang Ye

Research output: Chapter in Book/Conference proceedings/Edited volumeConference contributionScientificpeer-review

Abstract

In this paper, PARC software was used to determine the spatial distribution of the dominant reaction products, their chemical composition and area/volume percentage in alkali-activated fly ash (FA) and ground granulated blast furnace slag (GBFS) pastes. The pastes reacted at different rates and dominant compositional domains were Mg rich gel around GBFS particles, i.e. Ca-(Na-)Al-Si+Mg, while the domains further form the GBFS and FA particles consisted mainly of Ca-(Na-)Al-Si. The reaction degree of GBFS and FA was calculated. Alkali-activated GBFS reacted faster in the studied alkaline conditions, reaching 66 % reaction at 28 days as GBFS contains 99 vol.-% of highly-reactive calcium and magnesium-rich aluminosilicates. The reaction degree in alkali-activated FA and GBFS paste was lower, as FA contains 31 vol.-% of nonreactive phases (quartz, mullite, hematite).
The results obtained from PARC were compared with independent bulk analytical techniques X-ray fluorescence (XRF) and X-ray diffraction (XRD).
Original languageEnglish
Title of host publicationProceedings of the Workshop on Concrete Modelling and Material Behaviour in honor of Professor Klaas van Breugel
Subtitle of host publicationSpecial "Klaas van Breugel" Sessions during the Rilemweek 2018
EditorsGuang Ye
PublisherRilem
Number of pages6
VolumePRO 126
ISBN (Electronic)978-2-35158-215-2
ISBN (Print)978-2-35158-214-5
Publication statusPublished - 2018
EventWorkshop on Concrete Modelling and Materials Behaviour in Honor of Professor Klaas van Breugel - Lijm & Cultuur, Delft, Netherlands
Duration: 27 Aug 201829 Sep 2018

Conference

ConferenceWorkshop on Concrete Modelling and Materials Behaviour in Honor of Professor Klaas van Breugel
CountryNetherlands
CityDelft
Period27/08/1829/09/18
OtherSpecial "Klaas van Breugel" Sessions during the Rilemweek 2018 in honour of the retirement of Professor Klaas van Breugel

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