Compressive behavior of metakaolin–fly-ash-based geopolymer fiber-reinforced concrete after exposure to elevated temperatures

Yousef R. Alharbi; Aref A. Abadel; Ali S. Alqarni; Abobaker S. Binyahya

doi:10.2478/msp-2024-0049

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Compressive behavior of metakaolin–fly-ash-based geopolymer fiber-reinforced concrete after exposure to elevated temperatures

Materials Science-Poland

Volume 42 (2024): Issue 4 (December 2024)

By: Yousef R. Alharbi, Aref A. Abadel, Ali S. Alqarni and Abobaker S. Binyahya

Open Access

|Dec 2024

Figures & Tables

Particle size of MK and FA utilized in this investigation.

GPC cylindrical specimens during casting.

Time–temperature curves of GPC cylinders used in the current study.

Failure modes of representative specimens.

Relative compressive strength: (a) normal strength concrete [36,38,39] and (b) high strength concrete [36,37,40].

Stress–strain curves: (a) all specimens, (b) specimens at 25°C, (c) specimens at 300°C, and (d) specimens at 500°C.

Initial stiffness of all specimens: (a) the area under the curve until 0.3 peak stress (in the decreased portion) and (b) the area under the curve until peak stress.

MK’s chemical analysis (% weight)_

Composition	SiO₂	CaO	Fe₂O₃	Na₂O	Al₂O₃	TiO₂	SO₃	K₂O	P₂O₅	MgO	Others
Value (%)	50.995	1.287	2.114	0.284	42.631	1.713	0.439	0.337	0.051	0.127	0.022
Value (%)	61.30	0.28	4.39	0.12	24.80	0.80	0.39	1.49	0.45	0.74	5.26

Summary of test results_

Specimens	Compressive strength (MPa)	Relative difference (%)a	Initial stiffness (N/mm)	Relative difference (%)a	Toughness index (%)	Relative difference (%)a
M-25	41.94	—	19,853.3	—	2.38	—
M-300	31.79	24.2	11,560.0	41.8	1.77	25.3
M-500	23.00	45.2	31,88.9	83.9	1.38	41.9
MS-25	45.32	—	23,696.7	—	2.91	—
MS-300	32.85	27.5	7,300.0	69.2	2.25	22.8
MS-500	24.80	45.3	2,387.5	89.9	1.87	35.7
MSP-25	45.10	—	19,933.7	—	3.07	—
MSP-300	34.44	23.6	10,933.3	45.2	2.19	28.5
MSP-500	26.73	40.7	4,096.6	79.4	1.78	41.9

Fiber characteristics_

Properties	Fiber
Properties	SF	PVA
Shape	Hooked ends (circular cross section)	Straight (circular cross section)
Diameter (mm)	0.75	0.06
Length (mm)	60	12
Aspect ratio	80	200
Tensile strength (MPa)	1,225	1,600
Young’s modulus (MPa)	200,000	35,000
Density (kg/m³)	7,850	1,300

Test matrix utilized in the experimental scheme of the current study_

Mixture ID	Specimens ID	Temperatures (°C)	Fiber volume			No. of specimens
Mixture ID	Specimens ID	Temperatures (°C)	SF	PVA	Total	No. of specimens
M0	M-25	25	—	—	—	3
	M-300	300				3
	M-500	500				3
MS	MS-25	25	1%	—	1%	3
	MS-300	300				3
	MS-500	500				3
MSP	MSP-25	25	0.7%	0.3%	1%	3
	MSP-300	300				3
	MSP-500	500				3
	Total no. of specimens					27

GPC mixture proportions in kg/m3_

Material		Weight
MK		277.2
FA		118.8
NaOH solution		92
Na₂SiO₃ solution		291.3
Fine aggregate Crushed limestone (max size: 4.75 mm)		449.8
White sand (max size: 2 mm)		148.4
Coarse aggregate Crushed limestone, max size: 10 mm)		1365.8

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Articles in this issue

DOI: https://doi.org/10.2478/msp-2024-0049 | Journal eISSN: 2083-134X | Journal ISSN: 2083-1331

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Language: English

Page range: 180 - 196

Submitted on: Nov 29, 2024

Accepted on: Jan 10, 2025

Published on: Dec 31, 2024

Published by: Wroclaw University of Science and Technology

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

Compression strength,

Stress–strain curve,

Elevated temperature,

Fiber-reinforced concrete

Related subjects:

Materials sciences,

Materials sciences, other,

Nanomaterials,

Functional and smart materials,

Materials characterization and properties

© 2024 Yousef R. Alharbi, Aref A. Abadel, Ali S. Alqarni, Abobaker S. Binyahya, published by Wroclaw University of Science and Technology
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

Volume 42 (2024): Issue 4 (December 2024)

Compressive behavior of metakaolin–fly-ash-based geopolymer fiber-reinforced concrete after exposure to elevated temperatures

Figures & Tables

Figure 1

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Figure 12

MK’s chemical analysis (% weight)_

Summary of test results_

Fiber characteristics_

Test matrix utilized in the experimental scheme of the current study_

GPC mixture proportions in kg/m3_

Paradigm

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