Microstructural and Mineralogical Analysis of Alkali Activated Fly Ash-Slag Pastes

Marija Nedeljkovic; Kamel Arbi Ghanmi; Yibing Zuo; Guang Ye

Microstructural and Mineralogical Analysis of Alkali Activated Fly Ash-Slag Pastes

Marija Nedeljkovic, Kamel Arbi Ghanmi, Yibing Zuo, Guang Ye

Materials and Environment

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

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Abstract

The performances of alkali activated materials (AAM) are strongly related to their microstructures. The microstructure development is mainly affected by chemistry of the primary raw materials. In the present study the influence of different proportions of fly ash and slag (100:0, 70:30, 50:50, 30:70, 0:100 wt.%, named S0, S30, S50, S70, S100, respectively) on the microstructure and mineralogy of the alkali activated fly ash and slag based pastes has been investigated through XRD, TGA/DTGA, ESEM/EDX techniques. XRD has been used for the qualitative and quantitative analysis of different reaction products.
The Rietveld refinement method and TGA/DTGA analysis have demonstrated that the increase of slag content increased the amount of amorphous phase associated with gel formation. From ESEM results, a more refined and denser matrix has been deduced in slag rich mixtures. These results are in agreement with higher strength values observed for S70 and S100 mixtures (~100 MPa at 28d and ~120 MPa after 90d curing). Depending on the fly ash to slag ratio, two types of gel have been distinguished by EDX analysis, a N-A-S-H gel in the fly ash rich mixtures and a C-A-S-H gel in the slag rich pastes.

Original language	English
Title of host publication	3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites
Subtitle of host publication	Nanjing, China
Editors	Changwen Miao, Wei Sun, Jiaping Liu, Huisu Chen, Guang Ye, Klaas van Breugel
Publisher	RILEM Publications S.A.R.L.
Pages	1-10
Number of pages	10
Volume	117
ISBN (Electronic)	978-2-35158-189-6
ISBN (Print)	978-2-35158-188-9
Publication status	Published - 2016
Event	3rd International Conferences on Microstructure Related Durability of Cementitious Composites - Nanjing, China Duration: 24 Oct 2016 → 26 Oct 2016 Conference number: 3 http://www.microdurability2016.com/

Conference

Conference	3rd International Conferences on Microstructure Related Durability of Cementitious Composites
Abbreviated title	Microdurability 2016
Country/Territory	China
City	Nanjing
Period	24/10/16 → 26/10/16
Internet address	http://www.microdurability2016.com/

Keywords

Alkaline activation
Fly ash
Slag
Gel composition
Mineralogy

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Cite this

Nedeljkovic, M., Arbi Ghanmi, K., Zuo, Y., & Ye, G. (2016). Microstructural and Mineralogical Analysis of Alkali Activated Fly Ash-Slag Pastes. In C. Miao, W. Sun, J. Liu, H. Chen, G. Ye, & K. van Breugel (Eds.), 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites: Nanjing, China (Vol. 117, pp. 1-10). RILEM Publications S.A.R.L..

Nedeljkovic, Marija ; Arbi Ghanmi, Kamel ; Zuo, Yibing et al. / Microstructural and Mineralogical Analysis of Alkali Activated Fly Ash-Slag Pastes. 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites: Nanjing, China. editor / Changwen Miao ; Wei Sun ; Jiaping Liu ; Huisu Chen ; Guang Ye ; Klaas van Breugel. Vol. 117 RILEM Publications S.A.R.L., 2016. pp. 1-10

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title = "Microstructural and Mineralogical Analysis of Alkali Activated Fly Ash-Slag Pastes",

abstract = "The performances of alkali activated materials (AAM) are strongly related to their microstructures. The microstructure development is mainly affected by chemistry of the primary raw materials. In the present study the influence of different proportions of fly ash and slag (100:0, 70:30, 50:50, 30:70, 0:100 wt.%, named S0, S30, S50, S70, S100, respectively) on the microstructure and mineralogy of the alkali activated fly ash and slag based pastes has been investigated through XRD, TGA/DTGA, ESEM/EDX techniques. XRD has been used for the qualitative and quantitative analysis of different reaction products.The Rietveld refinement method and TGA/DTGA analysis have demonstrated that the increase of slag content increased the amount of amorphous phase associated with gel formation. From ESEM results, a more refined and denser matrix has been deduced in slag rich mixtures. These results are in agreement with higher strength values observed for S70 and S100 mixtures (~100 MPa at 28d and ~120 MPa after 90d curing). Depending on the fly ash to slag ratio, two types of gel have been distinguished by EDX analysis, a N-A-S-H gel in the fly ash rich mixtures and a C-A-S-H gel in the slag rich pastes.",

keywords = "Alkaline activation, Fly ash, Slag, Gel composition, Mineralogy",

author = "Marija Nedeljkovic and {Arbi Ghanmi}, Kamel and Yibing Zuo and Guang Ye",

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language = "English",

isbn = "978-2-35158-188-9",

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booktitle = "3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites",

publisher = "RILEM Publications S.A.R.L.",

address = "France",

note = "3rd International Conferences on Microstructure Related Durability of Cementitious Composites , Microdurability 2016 ; Conference date: 24-10-2016 Through 26-10-2016",

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Nedeljkovic, M, Arbi Ghanmi, K, Zuo, Y & Ye, G 2016, Microstructural and Mineralogical Analysis of Alkali Activated Fly Ash-Slag Pastes. in C Miao, W Sun, J Liu, H Chen, G Ye & K van Breugel (eds), 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites: Nanjing, China. vol. 117, RILEM Publications S.A.R.L., pp. 1-10, 3rd International Conferences on Microstructure Related Durability of Cementitious Composites , Nanjing, China, 24/10/16.

Microstructural and Mineralogical Analysis of Alkali Activated Fly Ash-Slag Pastes. / Nedeljkovic, Marija; Arbi Ghanmi, Kamel; Zuo, Yibing et al.
3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites: Nanjing, China. ed. / Changwen Miao; Wei Sun; Jiaping Liu; Huisu Chen; Guang Ye; Klaas van Breugel. Vol. 117 RILEM Publications S.A.R.L., 2016. p. 1-10.

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

TY - GEN

T1 - Microstructural and Mineralogical Analysis of Alkali Activated Fly Ash-Slag Pastes

AU - Nedeljkovic, Marija

AU - Arbi Ghanmi, Kamel

AU - Zuo, Yibing

AU - Ye, Guang

N1 - Conference code: 3

PY - 2016

Y1 - 2016

N2 - The performances of alkali activated materials (AAM) are strongly related to their microstructures. The microstructure development is mainly affected by chemistry of the primary raw materials. In the present study the influence of different proportions of fly ash and slag (100:0, 70:30, 50:50, 30:70, 0:100 wt.%, named S0, S30, S50, S70, S100, respectively) on the microstructure and mineralogy of the alkali activated fly ash and slag based pastes has been investigated through XRD, TGA/DTGA, ESEM/EDX techniques. XRD has been used for the qualitative and quantitative analysis of different reaction products.The Rietveld refinement method and TGA/DTGA analysis have demonstrated that the increase of slag content increased the amount of amorphous phase associated with gel formation. From ESEM results, a more refined and denser matrix has been deduced in slag rich mixtures. These results are in agreement with higher strength values observed for S70 and S100 mixtures (~100 MPa at 28d and ~120 MPa after 90d curing). Depending on the fly ash to slag ratio, two types of gel have been distinguished by EDX analysis, a N-A-S-H gel in the fly ash rich mixtures and a C-A-S-H gel in the slag rich pastes.

AB - The performances of alkali activated materials (AAM) are strongly related to their microstructures. The microstructure development is mainly affected by chemistry of the primary raw materials. In the present study the influence of different proportions of fly ash and slag (100:0, 70:30, 50:50, 30:70, 0:100 wt.%, named S0, S30, S50, S70, S100, respectively) on the microstructure and mineralogy of the alkali activated fly ash and slag based pastes has been investigated through XRD, TGA/DTGA, ESEM/EDX techniques. XRD has been used for the qualitative and quantitative analysis of different reaction products.The Rietveld refinement method and TGA/DTGA analysis have demonstrated that the increase of slag content increased the amount of amorphous phase associated with gel formation. From ESEM results, a more refined and denser matrix has been deduced in slag rich mixtures. These results are in agreement with higher strength values observed for S70 and S100 mixtures (~100 MPa at 28d and ~120 MPa after 90d curing). Depending on the fly ash to slag ratio, two types of gel have been distinguished by EDX analysis, a N-A-S-H gel in the fly ash rich mixtures and a C-A-S-H gel in the slag rich pastes.

KW - Alkaline activation

KW - Fly ash

KW - Slag

KW - Gel composition

KW - Mineralogy

UR - http://resolver.tudelft.nl/uuid:11d19e9c-87cb-41ba-878a-4bb49d2c57c3

M3 - Conference contribution

SN - 978-2-35158-188-9

VL - 117

SP - 1

EP - 10

BT - 3rd International RILEM Conference on Microstructure Related Durability of Cementitious Composites

A2 - Miao, Changwen

A2 - Sun, Wei

A2 - Liu, Jiaping

A2 - Chen, Huisu

A2 - Ye, Guang

A2 - van Breugel, Klaas

PB - RILEM Publications S.A.R.L.

T2 - 3rd International Conferences on Microstructure Related Durability of Cementitious Composites

Y2 - 24 October 2016 through 26 October 2016

ER -

Microstructural and Mineralogical Analysis of Alkali Activated Fly Ash-Slag Pastes

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Keywords

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