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

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

Materials and Environment

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-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 language	English
Title of host publication	Proceedings of the Workshop on Concrete Modelling and Material Behaviour in honor of Professor Klaas van Breugel
Subtitle of host publication	Special "Klaas van Breugel" Sessions during the Rilemweek 2018
Editors	Guang Ye
Publisher	Rilem
Number of pages	6
Volume	PRO 126
ISBN (Electronic)	978-2-35158-215-2
ISBN (Print)	978-2-35158-214-5
Publication status	Published - 2018
Event	Workshop on Concrete Modelling and Materials Behaviour in Honor of Professor Klaas van Breugel - Lijm & Cultuur, Delft, Netherlands Duration: 27 Aug 2018 → 29 Sept 2018

Conference

Conference	Workshop on Concrete Modelling and Materials Behaviour in Honor of Professor Klaas van Breugel
Country/Territory	Netherlands
City	Delft
Period	27/08/18 → 29/09/18
Other	Special "Klaas van Breugel" Sessions during the Rilemweek 2018 in honour of the retirement of Professor Klaas van Breugel

Cite this

@inproceedings{7f3c7a4a001044cd8312614b577140c8,

title = "Assessment of the slag and fly ash reactivity in alkali-activated pastes",

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).",

author = "Marija Nedeljkovic and {van Hoek}, Corrie and Stefan Melzer and {van der Laan}, Sieger and Guang Ye",

year = "2018",

language = "English",

isbn = "978-2-35158-214-5",

volume = "PRO 126",

editor = "Guang Ye",

booktitle = "Proceedings of the Workshop on Concrete Modelling and Material Behaviour in honor of Professor Klaas van Breugel",

publisher = "Rilem",

note = "Workshop on Concrete Modelling and Materials Behaviour in Honor of Professor Klaas van Breugel ; Conference date: 27-08-2018 Through 29-09-2018",

}

Nedeljkovic, M, van Hoek, C, Melzer, S, van der Laan, S & Ye, G 2018, Assessment of the slag and fly ash reactivity in alkali-activated pastes. in G Ye (ed.), Proceedings of the Workshop on Concrete Modelling and Material Behaviour in honor of Professor Klaas van Breugel: Special "Klaas van Breugel" Sessions during the Rilemweek 2018. vol. PRO 126, Rilem, Workshop on Concrete Modelling and Materials Behaviour in Honor of Professor Klaas van Breugel, Delft, Netherlands, 27/08/18.

Assessment of the slag and fly ash reactivity in alkali-activated pastes. / Nedeljkovic, Marija; van Hoek, Corrie; Melzer, Stefan et al.
Proceedings of the Workshop on Concrete Modelling and Material Behaviour in honor of Professor Klaas van Breugel: Special "Klaas van Breugel" Sessions during the Rilemweek 2018. ed. / Guang Ye. Vol. PRO 126 Rilem, 2018.

Research output: Chapter in Book/Conference proceedings/Edited volume › Conference contribution › Scientific › peer-review

TY - GEN

T1 - Assessment of the slag and fly ash reactivity in alkali-activated pastes

AU - Nedeljkovic, Marija

AU - van Hoek, Corrie

AU - Melzer, Stefan

AU - van der Laan, Sieger

AU - Ye, Guang

PY - 2018

Y1 - 2018

N2 - 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).

AB - 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).

M3 - Conference contribution

SN - 978-2-35158-214-5

VL - PRO 126

BT - Proceedings of the Workshop on Concrete Modelling and Material Behaviour in honor of Professor Klaas van Breugel

A2 - Ye, Guang

PB - Rilem

T2 - Workshop on Concrete Modelling and Materials Behaviour in Honor of Professor Klaas van Breugel

Y2 - 27 August 2018 through 29 September 2018

ER -

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

Abstract

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